METHOD AND SYSTEM FOR ELECTROPLATING UNIFORMITY

Description

FIELD OF INVENTION

The present disclosure relates to electroplating systems and methods, and more particularly to a method and system for achieving uniform electroplating by controlling the movement speed of an anode relative to edge regions of a cathode.

BACKGROUND

Electroplating is a widely used process in manufacturing where a thin layer of metal is deposited onto a substrate through electrochemical reactions. The process involves immersing a cathode (the substrate to be plated) and an anode in an electrolyte solution, then applying an electrical current to drive metal ions from the solution onto the cathode surface. This technique finds extensive application in various industries, including electronics, automotive, aerospace, and decorative finishing.

One of the primary challenges in electroplating is achieving uniform thickness across the entire surface of the substrate. Non-uniform deposition can result from several factors, including variations in current density distribution, electrolyte flow patterns, electrode positioning, and temperature changes, for example.

These challenges are particularly pressing in the microelectronics industry, where small components are often built layer by layer through electroplating. Any lack of uniformity in these layers can negatively impact the performance of the final device and compound as the layers are stacked.

One of the main causes of non-uniformity that prevents the use of a smaller anode is the proximity of the anode to the cathode—the closer the anode is, the more material it deposits. While it still plates areas that are farther away, the resulting fringe deposition tends to be thinner.

This thinner fringe deposition can still cause a large problem though at the edges of the cathode. The fringe can cause the anode to deposit material on the sides of the cathode, or, if those sides are blocked, it can cause thicker deposits towards the edge of the cathode. This occurs because the fringe simply has nowhere else to deposit, but it still exists. The result is a layer that has an increased thickness at the edges and is thinnest in the middle.

One way to combat the fringe is to mask the edge of the anode. This prevents the fringe deposition as the mask simply blocks the plating baths' access to the portions of the anode that are generating the fringe deposition. However, this requires a masking step, which can add cost. It also requires an anode that fits the cathode or the deposition area perfectly. This again adds costs and complexity to the system when uniformity is desired, such as in the microelectronics industry when circuit components are plated.

SUMMARY

This summary is provided to introduce a selection of concepts in a simplified form that are further described below in the detailed description. This summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.

Given that, two major problems of the anode deposition are that the portion of the anode closest to the cathode has the highest deposition rates and that the edges of the anode create the fringing effect. The present invention is directed towards a maskless anode that is smaller than the cathode. (As in an anode that is not as wide or as long as the cathode or both.) This counterintuitive approach allows for an elegant solution to overcome the problems of deposition rate as related to anode/cathode distance and the fringing deposition.

In the present invention, the anode is moved over a cathode, and as it approaches the edge of the cathode, it is sped up. This works because the fringe effect can simply be thought of as increasing the deposition rate per unit area over the edge of the cathode. Because it causes a deposition rate increase, moving the anode faster reduces the time for deposition and counteracts the increased rate of deposition.

Because the fringe is now accounted for, the need for masking the anode is eliminated (although it can still be masked). The anode can now be made smaller than the cathode without suffering the negative effects due to the loss of a uniform distance between the anode and the cathode. The anode can be the same anode shape for a variety of cathode shapes. The result is a low-cost and quickly implemented solution to providing layers with a high thickness uniformity.

Thus it can be said that an embodiment of the present invention includes a system for electroplating comprising: an anode configured to move parallel to the surface of the cathode, a speed control unit operably connected to the movement mechanism to vary the speed of the anode based on its distance to the edge regions of the cathode, wherein the speed is increased when the anode is proximate to the edge regions of the cathode or in a known or sensed region of higher thickness.

The movement of the anode may be based on sensor data, or it may be moved along a pre-configured path, or both, and multiple anodes may be used over the same cathode.

The path the anodes take may be based on data from previously formed layers. This allows for some calibration to occur and also allows for iteration of the movement paths.

In general, the method may comprise: providing an anode and a cathode, wherein the anode is arranged to move parallel to the surface of the cathode, moving the anode across the cathode surface using a movement mechanism, varying the speed of the anode as it approaches and moves over the edge regions of the cathode to ensure uniformity in the thickness of the plating.

As noted above, the ideal movement is to increase the speed of the anode when it is proximate to the edge regions of the cathode. However, another possible method is to decrease the speed of the anode as it moves through the middle regions of the cathode. This will balance the layer out as well, yet it will have the downside of creating a thicker layer. This thicker layer may have its uses, but it will generally be considered less desirable than thinner layers.

According to an aspect of the present disclosure, an electroplating system is provided. The electroplating system comprises an anode configured to move parallel to a surface of a cathode. The electroplating system further comprises a speed control unit operably connected to the anode and configured to vary a speed of the anode based on a distance of the anode to edge regions of the cathode. The speed of the anode increases when the anode is proximate to the edge regions of the cathode.

According to other aspects of the present disclosure, the electroplating system may include one or more of the following features. The anode may be smaller than the cathode. The anode may have a surface area that is less than 80% of a surface area of the cathode. The speed control unit may be configured to decrease the speed of the anode when the anode is positioned over a middle region of the cathode. The cathode may comprise a semiconductor substrate. The semiconductor substrate may be a wafer. The electroplating system may further comprise a movement mechanism operably connected to the anode and configured to move the anode across the surface of the cathode. The movement mechanism may be configured to move the anode in multiple passes over the cathode surface. The speed control unit may be configured to adjust the speed of the anode during each pass based on sensor data or a pre-configured path. The speed control unit may be configured to vary the speed of the anode to compensate for fringe deposition effects that occur near the edge regions of the cathode.

According to another aspect of the present disclosure, a method of electroplating is provided. The method comprises moving an anode along and parallel to a surface of a cathode. The method further comprises varying a speed of the anode based on a distance of the anode to edge regions of the cathode. The speed of the anode is increased when the anode is proximate to the edge regions of the cathode.

According to other aspects of the present disclosure, the method may include one or more of the following features. The anode may be smaller than the cathode. The anode may have a surface area that is less than 80% of a surface area of the cathode. Varying the speed of the anode may further comprise decreasing the speed of the anode when the anode is positioned over a middle region of the cathode. The method may further comprise a step of moving the anode in multiple passes over the cathode surface. Varying the speed of the anode may be performed during each pass based on sensor data or a pre-configured path.

According to yet another aspect of the present disclosure, an electroplating apparatus is provided. The electroplating apparatus comprises a cathode. The electroplating apparatus further comprises an anode smaller than the cathode and positioned to move parallel to a surface of the cathode. The electroplating apparatus further comprises a movement mechanism operably connected to the anode. The electroplating apparatus further comprises a speed control unit operably connected to the movement mechanism and configured to control the movement mechanism to increase a speed of the anode when the anode approaches the edge regions of the cathode to compensate for fringe deposition effects.

According to other aspects of the present disclosure, the electroplating apparatus may include one or more of the following features. The cathode may comprise a semiconductor substrate. The semiconductor substrate may be a wafer. The movement mechanism may be configured to move the anode in multiple passes over the surface of the cathode.

The foregoing general description of the illustrative embodiments and the following detailed description thereof are merely exemplary aspects of the teachings of this disclosure and are not restrictive.

BRIEF DESCRIPTION OF FIGURES

Non-limiting and non-exhaustive examples are described with reference to the following figures.

FIG. 1 is a cross-sectional view of an anode over a cathode with a deposit, according to aspects of the present disclosure.

FIG. 2 is a cross-sectional view of the anode of FIG. 1 moving over the cathode with a fringe deposit, according to an embodiment.

FIG. 3 is a cross-sectional view of the anode of FIG. 1 positioned near an edge of the cathode, according to aspects of the present disclosure.

FIG. 4 is a cross-sectional view showing the anode of FIG. 1 having traversed the entire cathode surface, according to an embodiment.

FIG. 5 is a cross-sectional view of the anode and cathode of FIG. 1 with a deposition profile, according to aspects of the present disclosure.

FIG. 6 is a top-down view of the anode and cathode of FIG. 1 showing a deposited layer region, according to an embodiment.

FIG. 7 depicts a graph showing a trace line indicating movement speed variation, according to aspects of the present disclosure.

FIG. 8 depicts a graph showing the trace line of FIG. 7 extended over time, according to an embodiment.

FIG. 9 is a cross-sectional view of the anode and cathode of FIG. 1 with a uniform layer, according to aspects of the present disclosure.

DETAILED DESCRIPTION

The following description sets forth exemplary aspects of the present disclosure. It should be recognized, however, that such description is not intended as a limitation on the scope of the present disclosure. Rather, the description also encompasses combinations and modifications to those exemplary aspects described herein.

Referring to FIG. 1, an electroplating system may include an anode 100 positioned above a cathode 102. The anode 100 and cathode 102 form the fundamental components of the electroplating process, where the anode 100 serves as the source of material to be deposited and the cathode 102 serves as the substrate upon which material deposition occurs. During the electroplating process, a deposit 101 forms on the surface of the cathode 102 as material from the anode 100 is transferred through an electroplating bath.

Here the anode 100 may be smaller than the cathode 102 in terms of surface area, which provides several operational advantages in the electroplating system. This size relationship allows the anode 100 to be positioned over different regions of the cathode 102 surface during the electroplating process.

The deposit 101 shown in FIG. 1 demonstrates how material deposition occurs directly beneath the anode 100, with the deposited material extending slightly beyond the edges of the anode 100 due to fringing effects. The cathode 102 provides an upper surface that serves as the deposition target, and the positioning of the anode 100 relative to this surface determines the location and characteristics of the deposit 101. This is the problem with a small anode—it will not plate the entire cathode. It can also be seen that some deposition occurred and is not directly under the anode itself. This deposition is caused by fringing on the anode and, in general, will be thinner than the primary deposit.

Still, once this limitation is overcome, the electroplating system may accommodate various substrate geometries through the use of standardized anode configurations. The anode 100 may maintain the same shape across different cathode 102 configurations, providing operational flexibility when working with cathodes 102 of varying dimensions or geometries. This standardization allows a single anode 100 design to be utilized across multiple electroplating applications without requiring custom anode fabrication for each specific cathode 102 shape as it is more about tracing the shape of the cathode than having the anode matching the shape.

Movement of a smaller anode allows the anode to deposit onto an entire cathode surface despite the size difference between the components. By systematically traversing the cathode surface in a controlled manner, the smaller anode can achieve complete coverage through multiple passes or extended movement patterns. This approach provides significant advantages in terms of flexibility and cost-effectiveness compared to using a larger anode that matches the cathode dimensions. The controlled movement enables precise deposition across the entire cathode while maintaining the ability to adjust parameters such as speed to compensate for edge effects and other deposition challenges.

FIG. 2 shows the same setup as in FIG. 1; however, the anode is now moving in direction 103. It can be seen that the anode has deposited a fringe deposit 104 ahead of it as it moves. The fringe deposit has a slope to it and is filled in as the anode catches up and moves over it. The fringe deposition phenomenon occurs as the electroplating bath conducts electrical current not only directly beneath the anode 100 but also in adjacent areas where the electrical field strength remains sufficient to drive the electrochemical reaction. At any given time, the fringe deposit 104 may exhibit different thickness characteristics compared to the primary deposit 101, typically forming a thinner layer that extends outward from the main deposition area.

But, as the anode reaches the proximity of the cathode, the fringing deposit runs out of area and extends out on the upper surface of the cathode. Now two things may happen to some degree, the fringing deposit corners over the edge of the cathode and deposits there, or it builds up on the edge. Most cathodes are tightly controlled for where the anode will plate, so the fringing flux often will not be able to build around the corner of the cathode. Instead, it will build up towards the edge regions of the cathode as it has nowhere else to go. This will result in a thicker portion of the layer as indicated by the profile of fringe deposit 104.

Referring to FIG. 3, as noted above, the anode 100 may encounter deposition challenges when positioned near the edge regions of the cathode 102, where the fringe deposit 104 behavior changes substantially compared to movement over central areas of the cathode 102. The movement direction 103 brings the anode 100 toward the boundary of the cathode 102, creating conditions where the fringe deposit 104 has limited available surface area for material deposition.

The fringe deposit 104 may exhibit increased thickness accumulation when the anode 100 approaches the edge regions of the cathode 102, as the material that would normally distribute over a larger area becomes concentrated in the available deposition space. The movement direction 103 toward the edge creates a scenario where the fringe deposit 104 cannot extend beyond the cathode 102 boundary, forcing the deposited material to accumulate in the remaining available area.

As shown in FIG. 3, the thickness of the deposit 101 may increase substantially when the anode 100 reaches proximity to the cathode 102 edge, demonstrating how spatial constraints affect material distribution during electroplating. The fringe deposit 104 that would normally extend outward from the anode 100 in the movement direction 103 encounters the cathode 102 boundary and contributes to increased local thickness rather than distributing over a broader area. This thickness accumulation may create non-uniform deposition profiles across the cathode 102 surface, with edge regions receiving disproportionately more material than central regions. The electroplating system may address these edge effects through controlled anode 100 movement parameters that account for the altered deposition behavior near cathode 102 boundaries.

Before proceeding it is worth noting that the movement direction 103 indicates the path along which the anode 100 travels parallel to the surface of the cathode 102. A movement mechanism operably connected to the anode 100 may facilitate this controlled movement, providing the mechanical means to translate the anode 100 across the cathode 102 surface. The deposit 101 continues to form beneath the anode 100 as the anode 100 moves, creating a continuous deposition pattern along the path of travel.

As such, the movement mechanism may move the anode 100 along a pre-configured path that may be predetermined based on known deposition patterns and cathode 102 geometry. This pre-configured path may account for the specific dimensions and shape of the cathode 102, allowing for systematic coverage of the entire cathode 102 surface during the electroplating process. The predetermined path may incorporate knowledge of how the fringe deposit 104 forms relative to the movement direction 103, enabling optimization of the deposition pattern across the cathode 102. The movement mechanism may provide precise control over the anode 100 positioning, ensuring that the anode 100 follows the predetermined path with accuracy and repeatability.

It is the movement direction 103 that affects how the fringe deposit 104 develops, with the leading edge of the anode 100 movement creating the most pronounced fringe effects. The deposit 101 and fringe deposit 104 together form the complete deposition pattern resulting from the moving anode 100, with the relative contributions of each component depending on the specific electroplating conditions and anode 100 movement parameters.

A speed control unit operably connected to the anode 100 may be configured to vary a speed of the anode 100 based on a distance of the anode 100 to edge regions of the cathode 102, providing a mechanism to compensate for the fringe deposition effects that occur near the cathode 102 boundaries. The speed control unit may adjust movement parameters accordingly to address the thickness accumulation shown in FIG. 3. In some cases, the speed control unit monitor the position of the anode 100 relative to the cathode 102 edges in other cases it may be preprogrammed. The speed of the anode 100 may increase when the anode 100 becomes proximate to the edge regions of the cathode 102, reducing the time available for the concentrated fringe deposit 104 formation. This speed variation may help counteract the increased deposition rate per unit area that occurs when the fringe deposit 104 has limited space for distribution, promoting more uniform thickness across the cathode 102 surface as will be covered in discussion of FIG. 9.

It is worth further exploring uniform movement speed of the anode will produce. Referring to FIG. 4, the anode 100 may complete movement across the entire surface of the cathode 102, resulting in comprehensive coverage of the cathode 102 through systematic traversal in a movement direction, for example, movement direction 103. The movement mechanism operably connected to the anode 100 may facilitate this complete coverage by moving the anode 100 across the surface of the cathode 102 in a controlled manner that encompasses the full extent of the cathode 102 dimensions. During this complete traversal, the anode 100 encounters both edge regions of the cathode 102, creating conditions where fringe deposit 104 formation occurs at multiple locations along the cathode 102 perimeter. A deposited layer 105 forms between the edge regions as the anode 100 moves across the central portion of the cathode 102, providing material deposition coverage across the intermediate areas of the cathode 102 surface.

The fringe deposit 104 may accumulate at both edges of the cathode 102 as the anode 100 completes the full traversal pattern, with each edge experiencing the thickness accumulation effects. The deposited layer 105 represents the material deposition that occurs in the central regions of the cathode 102. The movement mechanism may be configured to move the anode 100 in multiple passes over the cathode surface, allowing for repeated coverage of the cathode 102 area to build up the deposited layer 105 and achieve the desired material thickness. Each pass of the anode 100 may contribute additional material to both the deposited layer 105 and the fringe deposit 104 areas, with the cumulative effect creating the overall deposition pattern shown in FIG. 4.

As shown in FIG. 4, the complete anode 100 movement pattern may result in a deposition configuration where the fringe deposit 104 areas exhibit greater thickness compared to the deposited layer 105 in the central regions of the cathode 102. The movement direction 103 indicates the path along which the anode 100 travels to achieve this complete coverage, with the anode 100 encountering different deposition conditions as the anode 100 transitions between central and edge regions of the cathode 102. The movement mechanism may provide the mechanical control necessary to maintain consistent anode 100 positioning relative to the cathode 102 surface throughout the complete traversal process. The deposited layer 105 formation may occur continuously as the anode 100 moves across the cathode 102, with the material deposition rate varying based on the local electrochemical field conditions and the proximity to cathode 102 boundaries.

With continued reference to FIG. 4, the movement mechanism may be configured to move the anode 100 in multiple passes over the surface of the cathode 102, enabling the buildup of both the deposited layer 105 and the fringe deposit 104 through repeated material deposition cycles. Each pass of the anode 100 may contribute incremental material addition to the existing deposition pattern, with the fringe deposit 104 areas receiving additional thickness accumulation during each traversal of the edge regions if speed of anode 100 is not calibrated. Still, the deposited layer 105 may develop uniform characteristics in the central regions of the cathode 102 where the anode 100 movement encounters consistent spatial conditions without the boundary constraints that affect fringe deposit 104 formation. The multiple pass configuration may allow for precise control over the total material thickness deposited across the cathode 102 surface, with each pass contributing a predictable amount of material to both the deposited layer 105 and fringe deposit 104 areas. So, it can be seen that the negative effects fringing compound under multiple layers, and this effect may be especially pronounced where thousands of layers have been produced in a single component.

Referring to FIG. 5, the complete anode 100 movement across the cathode 102 may result in a deposition profile 106 that characterizes the thickness variation across the cathode 102 surface following conventional anode 100 movement without speed control modifications. The deposition profile 106 may exhibit thickness variations that correspond to the fringe deposit 104 accumulation at the cathode 102 edges and the more uniform deposited layer 105 formation in the central regions. The cathode 102 provides the substrate upon which this deposition profile 106 develops, with the surface characteristics of the cathode 102 influencing how the material distributes during the electroplating process. The anode 100 positioning relative to the cathode 102 determines the specific characteristics of the deposition profile 106, with the spatial relationship between these components governing the material transfer efficiency and distribution patterns.

The deposition profile 106 may demonstrate the thickness accumulation effects that result from conventional anode 100 movement patterns where speed control measures may not be implemented to compensate for fringe deposit 104 formation. The profile characteristics shown in FIG. 5 may represent the baseline deposition pattern that occurs when the anode 100 moves across the cathode 102 at constant speed without adjustment for the varying deposition conditions encountered in different regions of the cathode 102 surface. The deposition profile 106 may serve as a reference for understanding how material thickness varies across the cathode 102 when conventional movement parameters are employed. The cathode 102 surface receives material deposition according to this profile, with the resulting thickness distribution reflecting the combined effects of direct deposition beneath the anode 100 and the fringe deposit 104 contributions that occur throughout the movement process.

Referring to FIG. 6, a top-down view of the electroplating system may reveal the spatial relationship between the anode 100 and cathode 102 from a perspective that shows the complete surface area of both components. The anode 100 may be positioned over the cathode 102 in a configuration that demonstrates the relative size difference between these components, with the anode 100 occupying a portion of the total cathode 102 surface area. The movement direction 103 may be indicated to show the path along which the anode 100 travels during the electroplating process, providing a clear indication of how the anode 100 traverses the cathode 102 surface. The top-down perspective may allow for visualization of the complete deposition area and the spatial constraints that influence material distribution patterns across the cathode 102 surface.

The deposition profile 106 may be represented by curved lines that mark regions of increased thickness across the cathode 102 surface, illustrating the non-uniform material distribution that results from conventional anode 100 movement patterns. These curved deposition profile 106 patterns may extend across portions of the cathode 102 surface in configurations that correspond to the areas where fringe deposition effects create thickness accumulation. The curved nature of the deposition profile 106 may reflect the complex electrochemical field distribution that occurs during the electroplating process, with the field strength varying across different regions of the cathode 102 surface based on the anode 100 positioning and movement characteristics. The deposition profile 106 may demonstrate how material thickness varies not only along the direction of anode 100 movement but also across the width of the cathode 102 perpendicular to the movement direction 103.

As shown in FIG. 6, the deposition profile 106 may exhibit curved characteristics that indicate the three-dimensional nature of the thickness variation problem in electroplating applications. The curved deposition profile 106 patterns may extend from edge regions toward central areas of the cathode 102, creating thickness gradients that vary both longitudinally and laterally across the cathode 102 surface. The anode 100 positioning relative to the cathode 102 may influence how these curved deposition profile 106 patterns develop, with the spatial relationship between the components determining the specific geometry of the thickness variation regions. The movement direction 103 may intersect with the curved deposition profile 106 patterns in ways that create complex deposition scenarios where thickness control becomes challenging without appropriate speed control measures.

The top-down view may provide insight into the comprehensive nature of the deposition uniformity challenge, showing how the curved deposition profile 106 patterns affect substantial portions of the cathode 102 surface area. The deposition profile 106 may indicate that thickness variations occur not as simple linear gradients but as complex curved patterns that reflect the multidimensional nature of the electrochemical field distribution during anode 100 movement. The cathode 102 surface may experience material deposition according to these curved deposition profile 106 patterns, with different regions receiving varying amounts of material based on their position relative to the anode 100 and the local field strength characteristics. The curved deposition profile 106 may demonstrate that achieving uniform thickness across the cathode 102 surface requires addressing not only edge effects but also the broader spatial distribution patterns that develop during the electroplating process.

Referring to FIG. 7, the speed control unit may implement controlled speed variations through systematic adjustment of the anode 100 movement parameters based on the position of the anode 100 relative to the cathode 102 surface. A trace line 111 may represent the speed variation pattern that the speed control unit generates during a single pass of the anode 100 across the cathode 102, providing a graphical representation of how the anode 100 speed changes as the anode 100 moves from one edge region to another edge region of the cathode 102. A speed curve 112 may demonstrate the specific velocity profile that the speed control unit implements to compensate for the fringe deposit 104 effects and achieve more uniform material distribution across the cathode 102 surface. The trace line 111 and speed curve 112 together may illustrate the relationship between anode 100 positioning and the corresponding speed adjustments that the speed control unit applies during the electroplating process. The speed control unit may be configured to vary a speed of the anode 100 based on a distance of the anode 100 to edge regions of the cathode 102, with the trace line 111 providing a visual representation of how this distance-based speed control operates in practice.

The speed control unit may be configured to increase the speed of the anode 100 when the anode 100 becomes proximate to the edge regions of the cathode 102, as demonstrated by the elevated portions of the speed curve 112 shown in FIG. 7. The trace line 111 may exhibit higher velocity values at the extremes of the anode 100 travel path, corresponding to the positions where the anode 100 approaches the boundaries of the cathode 102 and encounters the spatial constraints that lead to fringe deposit 104 accumulation. The speed control unit may monitor the position of the anode 100 relative to the cathode 102 edges and automatically adjust the movement parameters to increase the anode 100 velocity when proximity to edge regions is detected. The speed curve 112 may show how the velocity increases progressively as the anode 100 approaches each edge region, with the rate of increase calibrated to counteract the enhanced deposition rate per unit area that occurs when the fringe deposit 104 has limited space for distribution. The trace line 111 may provide a continuous record of the speed variations implemented by the speed control unit throughout the complete traversal of the cathode 102 surface.

As shown in FIG. 7, the speed control unit may be configured to decrease the speed of the anode 100 when the anode 100 is positioned over a middle region of the cathode 102, creating a velocity profile where the lowest speeds occur in the central areas of the cathode 102 surface. The trace line 111 may exhibit reduced velocity values in the central portion of the anode 100 travel path, corresponding to the region where the fringe deposit 104 effects may be less pronounced due to the availability of extended surface area for material distribution. The speed curve 112 may demonstrate how the velocity decreases as the anode 100 moves away from the edge regions and approaches the central area of the cathode 102, with the minimum speed occurring at the midpoint of the traversal path. The speed control unit may implement this speed reduction to allow for adequate material deposition time in the central regions where the fringe deposit 104 does not contribute additional thickness accumulation. The trace line 111 may show a smooth transition between the higher edge speeds and the lower central speeds, creating a continuous velocity profile that addresses the varying deposition conditions across the cathode 102 surface.

The speed control unit may be configured to adjust the speed of the anode 100 during each pass based on sensor data or a pre-configured path, providing flexibility in how the speed variations are determined and implemented during the electroplating process. The sensor data may provide real-time feedback regarding the position of the anode 100 relative to the cathode 102, allowing the speed control unit to make dynamic adjustments to the velocity profile based on actual positioning information rather than predetermined timing sequences. The trace line 111 may represent the speed pattern that results from sensor-based control, where the speed adjustments occur in response to measured anode 100 position data rather than following a fixed time-based schedule. The pre-configured path may provide an alternative control methodology where the speed variations follow a predetermined pattern based on known cathode 102 geometry and expected deposition characteristics. The speed curve 112 may demonstrate how either sensor-based or pre-configured control methods can produce the desired velocity profile that compensates for fringe deposit 104 effects and promotes uniform material distribution across the cathode 102 surface.

The speed variation patterns may fall into general patterns that are condition-dependent and may be selected based on specific electroplating conditions encountered during the deposition process. The trace line 111 may represent one example of a speed variation pattern that may be suitable for particular cathode 102 dimensions, anode 100 sizes, or electroplating bath compositions, with alternative patterns available for different operating conditions. The speed curve 112 characteristics may vary depending on factors such as the electroplating bath chemistry, the material being deposited, the desired thickness uniformity tolerances, and the specific geometry of the cathode 102 being processed. The speed control unit may store multiple speed variation patterns and select the appropriate pattern based on the specific electroplating conditions detected or specified for each processing operation. The trace line 111 may be modified or adjusted to accommodate different cathode 102 sizes, with the speed curve 112 scaling appropriately to maintain the desired relationship between anode 100 position and velocity throughout the traversal process. The condition-dependent nature of the speed patterns may allow the electroplating system to adapt to varying processing requirements while maintaining the fundamental principle of increased speed near edge regions and decreased speed in central regions of the cathode 102.

Referring to FIG. 8, the speed control unit may implement extended time-based movement patterns that demonstrate how the trace line 111 and speed curve 112 develop characteristic shapes over multiple passes of the anode 100 across the cathode 102 surface. The trace line 111 may exhibit a repeating pattern that extends over time as the movement mechanism performs successive traversals of the cathode 102, with each pass contributing to the overall temporal profile of the speed control system. The speed curve 112 may form distinctive geometric shapes when viewed over extended electroplating cycles creating patterns that reflect the systematic nature of the speed variations implemented during multiple anode 100 movements. The extended time-based view may reveal how the speed control unit maintains consistency across multiple passes while accommodating the varying deposition conditions encountered during each traversal of the cathode 102 surface.

The movement mechanism may be configured to move the anode 100 in multiple passes over the surface of the cathode 102, enabling the buildup of material thickness through repeated deposition cycles that each contribute incremental material addition to the cathode 102 surface. Each pass of the anode 100 may follow the same speed variation pattern established by the speed control unit, with the trace line 111 repeating the characteristic velocity profile that compensates for fringe deposition effects during each traversal. The speed curve 112 may maintain consistent shape characteristics across multiple passes, ensuring that the speed variations applied during each cycle provide uniform compensation for the deposition non-uniformities that occur near the edge regions of the cathode 102. The multiple pass configuration may allow for precise control over the total material thickness deposited across the cathode 102 surface, with each pass contributing a predictable amount of material while maintaining the speed control measures that promote uniform distribution.

As shown in FIG. 8, the trace line 111 may form characteristic shapes over extended time periods that resemble distinctive geometric patterns when the speed variations are plotted continuously across multiple anode 100 passes. The speed curve 112 may create repeating formations that demonstrate the cyclical nature of the speed control system, with each cycle corresponding to one complete traversal of the anode 100 across the cathode 102 surface. The extended time-based pattern may reveal how the speed control unit coordinates the timing of speed increases and decreases to maintain optimal deposition conditions throughout multiple passes of the electroplating process. The characteristic shapes formed by the trace line 111 may provide visual confirmation that the speed control system operates consistently across extended electroplating cycles, with the repeating patterns indicating stable control system performance over time.

The temporal aspects of the speed control system may encompass the coordination of speed variations across multiple passes, with the speed control unit managing the timing relationships between successive anode 100 movements to maintain uniform deposition characteristics throughout extended electroplating operations. The trace line 111 may demonstrate how the speed control unit synchronizes the velocity changes with the anode 100 position during each pass, creating temporal patterns that repeat with each cycle while maintaining the precise timing relationships that compensate for fringe deposition effects. The speed curve 112 may exhibit temporal characteristics that reflect the duration of each speed variation phase, with the time spent at elevated speeds near edge regions balanced against the time spent at reduced speeds in central regions of the cathode 102. The extended electroplating cycles may require the speed control unit to maintain consistent temporal performance across multiple passes, ensuring that the speed variations applied during later passes provide the same deposition uniformity benefits as those applied during initial passes.

The slope of the speed trace may change depending on the plating bath composition or the plating setup configuration, allowing the speed control system to adapt to varying electroplating conditions while maintaining the fundamental principle of increased speed near edge regions. The trace line 111 may exhibit different slope characteristics when the electroplating bath chemistry changes, with steeper or more gradual transitions between minimum and maximum speeds depending on how the bath composition affects the fringe deposition behavior. The speed curve 112 may be modified to accommodate different plating setup configurations, with the slope adjustments reflecting changes in the spatial relationship between the anode 100 and cathode 102 or variations in the electrochemical field distribution that occur with different equipment arrangements. The plating bath composition may influence the rate at which speed changes occur during each pass, with some bath chemistry requiring more rapid speed transitions while others may benefit from more gradual velocity changes to achieve optimal deposition uniformity.

With continued reference to FIG. 8, the implementation of the speed control system over extended electroplating cycles may involve coordination between the movement mechanism and the speed control unit to ensure that multiple passes maintain consistent deposition characteristics while accommodating any temporal variations that may occur during extended processing operations. The trace line 111 may provide feedback information that allows the speed control unit to monitor the consistency of speed variations across multiple passes, with deviations from the expected pattern indicating potential adjustments needed in the control system parameters.

The movement mechanism may implement multiple passes over the cathode surface during a single layer deposition, with each pass contributing incremental material addition according to the controlled speed profile. In some cases, the multiple pass approach may provide enhanced control over material distribution compared to a single slow movement across the cathode surface. The trace line 111 may exhibit periodic characteristics that reflect the cyclic nature of the multiple pass movement pattern, with each cycle maintaining the fundamental relationship between position and velocity established for optimal deposition control.

The slope characteristics of the speed curve 112 may vary based on specific electroplating conditions, including the composition of the plating bath and the configuration of the electroplating setup. In some cases, the slope of the trace line 111 may become steeper or shallower to accommodate changes in deposition behavior that result from variations in bath chemistry or process parameters. The speed curve 112 may adapt to these condition-dependent requirements while maintaining the essential pattern of increased velocity near edge regions and reduced velocity in central regions throughout multiple movement cycles.

With continued reference to FIG. 8, the temporal aspects of the speed control system may manifest in the extended pattern of the trace line 111, where successive passes create a three-dimensional representation of the velocity profile over time. The speed curve 112 may demonstrate how the movement mechanism maintains precise control over velocity variations throughout extended electroplating cycles, with each pass contributing to the characteristic shape of the temporal pattern. The multiple pass configuration may allow for fine-tuning of the deposition profile through cumulative material addition under controlled speed conditions.

The trace line 111 may exhibit consistent periodicity across multiple passes, indicating stable implementation of the speed control parameters throughout extended processing intervals. In some cases, the speed curve 112 may incorporate minor adjustments between passes to account for evolving electroplating conditions while maintaining the fundamental velocity profile that promotes uniform material distribution. The temporal pattern may provide a comprehensive representation of how the movement mechanism executes multiple passes with controlled speed variation to achieve desired deposition characteristics.

Referring to FIG. 9, the implementation of controlled anode 100 movement with speed variations may result in the formation of a uniform layer 900 across the surface of the cathode 102, demonstrating how the speed control methodology compensates for fringe deposition effects to achieve consistent material thickness distribution. The uniform layer 900 may exhibit substantially consistent thickness characteristics across the entire surface area of the cathode 102, contrasting with the non-uniform deposition patterns that occur when conventional constant-speed movement approaches are employed. The anode 100 may be positioned above the cathode 102 in the same spatial relationship as in previous configurations, but the controlled movement parameters produce markedly different deposition results. The cathode 102 may comprise a semiconductor substrate that provides the target surface for the uniform layer 900 formation, with the substrate characteristics influencing how the controlled deposition process achieves thickness uniformity across the surface area.

The uniform layer 900 may demonstrate how the speed control unit compensates for the fringe deposition effects that would otherwise create thickness accumulation near the edge regions of the cathode 102, resulting in consistent material distribution that extends from edge regions to central areas without substantial thickness variation. The controlled speed increases implemented when the anode 100 approaches edge regions may reduce the time available for fringe deposit accumulation, while the controlled speed decreases in central regions may allow adequate deposition time to achieve uniform thickness across the cathode 102 surface. The uniform layer 900 formation may occur through the systematic application of speed variations that counteract the natural tendency for increased deposition rates near cathode 102 boundaries. The deposition per unit area of the cathode 102 may achieve uniformity through the coordinated relationship between anode 100 positioning and the corresponding speed adjustments implemented by the speed control unit throughout the movement process.

The anode 100 may have a surface area that is less than 80% of a surface area of the cathode 102, enabling the controlled movement approach while maintaining adequate material transfer capacity for uniform layer 900 formation across the larger cathode 102 surface. The size relationship between the anode 100 and cathode 102 may facilitate the movement-based deposition control methodology, with the smaller anode 100 dimensions allowing for systematic coverage of the cathode 102 surface through controlled traversal patterns. The uniform layer 900 may form through multiple passes of the smaller anode 100 across the cathode 102, with each pass contributing incremental material addition under controlled speed conditions that compensate for the spatial constraints encountered during movement. The surface area relationship may enable the anode 100 to provide comprehensive coverage of the cathode 102 while maintaining the mobility characteristics that allow for effective speed control implementation during the deposition process.

In some cases, the semiconductor substrate may be a wafer that provides the target surface for uniform layer 900 formation in microelectronics manufacturing applications where thickness uniformity across the wafer surface may be particularly important for device performance characteristics. The wafer configuration may present specific geometric constraints that influence how the controlled anode 100 movement achieves uniform deposition across the circular or rectangular surface area typical of semiconductor processing applications. The uniform layer 900 formation on wafer substrates may benefit from the controlled speed variations that address the edge effects commonly encountered in semiconductor electroplating processes, where thickness non-uniformities can impact device functionality across different regions of the wafer. The cathode 102 configuration as a wafer may require specific movement patterns and speed control parameters to achieve the uniform layer 900 characteristics shown in FIG. 9, with the controlled deposition process adapting to the particular geometric and material characteristics of semiconductor substrates.

The anode 100 may be switched out with another anode as the uniform layer 900 is built up, allowing for multiple different anodes to be used during the electroplating process while maintaining the controlled movement and speed variation methodology that produces uniform thickness distribution. The ability to exchange anodes during layer formation may provide flexibility in material composition, anode size, or surface characteristics while preserving the fundamental speed control approach that compensates for fringe deposition effects. The uniform layer 900 may develop through contributions from multiple anodes, with each anode following the same controlled movement patterns and speed variations to maintain consistency in the deposition uniformity across the cathode 102 surface. The anode exchange capability may allow for optimization of different aspects of the deposition process while maintaining the uniform layer 900 formation characteristics achieved through controlled speed variations during movement across the cathode 102.

With continued reference to FIG. 9, the path that anodes take during uniform layer 900 formation may be based on data from previously formed layers, allowing for calibration and iteration of the movement paths over multiple layers to achieve enhanced deposition uniformity through accumulated process knowledge. The data from previous layers may provide feedback regarding the effectiveness of specific speed variation patterns and movement paths in achieving uniform layer 900 characteristics, enabling refinement of the control parameters for subsequent layer formation cycles. The uniform layer 900 shown may represent the result of iterative improvements in the movement path and speed control parameters based on analysis of previous deposition results across the cathode 102 surface. The calibration approach may allow the speed control unit to adapt the movement patterns and velocity profiles based on measured thickness distribution data from earlier layers, progressively improving the uniformity characteristics of the uniform layer 900 through systematic parameter optimization. The iterative refinement process may enable the electroplating system to achieve enhanced uniform layer 900 formation by incorporating learning from previous deposition cycles into the control algorithms that govern anode 100 movement and speed variation across the cathode 102 surface.

A number of implementations have been described. Nevertheless, it will be understood that various modifications may be made without departing from the spirit and scope of the disclosure. Accordingly, other implementations are within the scope of the following claims.