METHOD AND APPARATUS FOR COPPER ELECTROPLATING
A method and apparatus for a copper electroplating procedure, wherein a first additive is preferentially adsorbed onto the field region of a substrate and a second additive is preferentially adsorbed onto the surfaces of at least one recessed region of the substrate, is provided. The first additive is more resistive to the electrodeposition relative to the second additive such that the recessed regions are filled at a faster rate than a layer is deposited on the field region.
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The present invention relates to copper electroplating, and more particularly to a method and apparatus for copper electroplating a substrate in a semiconductor manufacturing process by preferentially adsorbing additives onto the substrate prior to the electroplating procedure.
BACKGROUND OF THE INVENTIONIn today's electronic products, integrated circuit chips are packaged in a planar two-dimensional style in which wire bonding is used for connecting the various chips to the board. Further, miniaturization and performance enhancement will require three-dimensional interconnection schemes whereby various chips are stacked and vertically connected by interconnects drilled through the substrate. The three-dimensional interconnects are shorter between chips than in a two-dimensional configuration, which allows for higher system speed and smaller power consumption. Three-dimensional integration processes bring a new challenge to the semiconductor industry which includes filling large vias and interconnects. While submicron size vias take a couple of minutes to fill, wide vias and interconnects having a depth of up to hundreds microns and/or widths of tens of microns may take hours to fill and large voids may occur. Successfully filling these vias with copper depends on the role of additives and the plating method used.
Conventional semiconductor devices generally include a semiconductor substrate, such as a silicon substrate, and a plurality of sequentially formed dielectric interlayers and conductive pathways made of conductive materials. In an integrated circuit, multiple levels of interconnected networks extend laterally with respect to the substrate surface. The interconnects are typically formed by filling in features or cavities etched into the dielectric interlayers by a metallization process such as electrodeposition, for example. Copper, CVD tungsten, and copper alloys are considered preferable materials for filling the vias and interconnects because of their superior electromigration and low resistivity characteristics. Vias formed in adjacent interlayers can be electrically connected using interconnects.
Copper electroplating is commonly performed cathodically in a specially formulated electrolyte solution, or plating bath, containing copper ions as well as additives that control the texture, morphology, and plating behavior of the deposited copper layer. The electroplating process typically is performed by immersing a substrate into a plating solution that also contains an anode plate, which can be consumable, disposed therein. The substrate includes a seed layer formed over a barrier layer, and an electrical contact is operatively connected to the seed layer. Deposition of the copper onto the seed layer is initiated when a cathodic potential, with respect to the anode plate, is applied. Typical plating solutions commercially available for plating copper layers contain copper sulfate (CuSO4) as the copper ion source. The plating solution may also have other ingredients such as chloride ions, which have an effect on the adsorption of the additives.
The additives added to the electrolyte solution help to deposit a smooth and shiny layer of copper. These additives can be categorized as suppressors, accelerators, levelers, brighteners, grain refiners, wetting agents, stress reducing agents, or the like. The relative size of the accelerator molecules is smaller than the relative size of the suppressor molecules which, in turn, is smaller than the relative size of the leveler molecules. Typical suppressors include, but are not limited to, polyethylene glycol (“PEG”) and polypropylene glycol (“PPG”). Typical accelerators include, but are not limited to, organic disulfides. Typical levelers include, but are not limited to, organic compounds such as Crystal Violent, Janus Green and BTA. The additives play an important role in forming interconnects between adjacent interlayers because filling the vias and trenches in the metallization process requires a bottom-up, void-free filling capability. The additives assist in controlling the rate of electroplating on different surfaces.
The additive concentration in the electrolyte solution is a critical parameter in maintaining reliable plating processes. For example, it is known that accelerator molecules are consumed rapidly even when current is not applied. This is due to the catalytic decomposition that takes place at a copper anode surface. For this reason, a costly and complicated system is commonly used for most advanced plating tools in which the accelerator additives are separated from the anode plate by a membrane being disposed between the substrate being processed and the anode plate. The function of the membrane is to allow the copper ions in the electrolyte solution to diffuse through the membrane while preventing direct contact between the accelerator additive molecules and the anode plate. This can be accomplished by having two compartments for the plating bath isolated by the membrane, wherein one compartment is filled with an additive-free electrolyte and containing the anode plate and the other compartment is filled with an electrolyte solution containing additives and also contains the substrate being processed. In addition, because the concentration of the additives is critical during the electroplating process, the electrolyte solution must be continually sampled and tested. The testing apparatus is an expensive piece of equipment for maintaining the proper balance and levels of additives within the electrolyte solution for the above-described complex plating apparatus.
Accordingly, an electroplating process that eliminates the need for a membrane separating the anode plate from the additives, which in turn eliminates the need for expensive analysis machinery to maintain the proper concentration of additives, is needed. Further, an electroplating process that reduces the copper film thickness on the field regions that surround the vias and interconnects while filling vias or interconnects is also needed. Additionally, a plating process that reduces the overall cost for the fabrication of copper interconnects by reducing the cost of the subsequent chemical mechanical planarization (“CMP”) procedure is needed.
BRIEF SUMMARY OF THE INVENTIONIn one aspect of the present invention, a method for electroplating a substrate having a field region and at least one recessed region formed therein is provided. The method includes preferentially adsorbing a first additive to surfaces of at least one recessed region. The method also includes preferentially adsorbing a second additive to the field region. The substrate is then immersed into a plating bath to perform an electroplating procedure to electrodeposit copper onto the substrate. The preferentially adsorbed first and second additives cause copper to be electroplated into the recessed regions faster than copper is electrodeposited onto the field region.
In another aspect of the present invention, a method for electroplating a substrate is provided. The method includes immersing the substrate into a first tank that contains an electrolyte solution. The electrolyte solution includes a first additive and a second additive. The first additive is preferentially adsorbed onto surfaces of at least one recessed region formed in the substrate, and the second additive is preferentially adsorbed onto a field region of the substrate. The method further includes rinsing excess electrolyte solution from the substrate. After rinsing, the substrate is then immersed into a plating bath for an electroplating procedure, wherein the first additive provides less resistance to electrodeposition of copper than said second additive.
In yet another aspect of the present invention, an apparatus for electroplating a substrate having a field region and at least one recessed region formed therein is provided. The apparatus includes a first tank that contains a first additive. The substrate is immersed into the first tank to allow the first additive to be preferentially adsorbed onto the field region or onto surfaces of the at least one recessed region. The apparatus also includes a second tank that contains a second additive. The substrate is immersed into the second tank to allow the second additive to be preferentially adsorbed onto the other of the field region or onto the surfaces of a recessed region. The apparatus further includes a third tank that contains a plating bath. An anode plate is disposed within the plating bath. The substrate is operatively connectable to the anode plate to form an electrical circuit for an electroplating procedure.
In yet a further aspect of the present invention, an apparatus for electroplating a substrate having a field region and at least one recessed region formed therein is provided. The apparatus includes a spin-on mechanism configured to preferentially adsorb a first additive onto either the field region or the surfaces of the at least one recessed region. The spin-on mechanism is further configured to preferentially adsorb a second additive onto the other of the field region or the surfaces of the at least one recessed region. The apparatus also includes a tank containing a plating bath into which said substrate is immersable for an electroplating procedure. An anode plate is disposed within the plating bath. The anode plate is operatively connectable to the substrate through the plating bath to form an electrical circuit for performing an electroplating procedure.
Advantages of the present invention will become more apparent to those skilled in the art from the following description of the embodiments of the invention which have been shown and described by way of illustration. As will be realized, the invention is capable of other and different embodiments, and its details are capable of modification in various respects. Accordingly, the drawing(s) and description are to be regarded as illustrative in nature and not as restrictive.
In processing semiconductor integrated circuits (“IC”), electroplating often utilizes an electrolyte solution containing copper ions and additives to deposit a layer of copper onto an exposed, electrically conductive surface. The electrically conductive surface may be a seed layer of copper formed by chemical vapor deposition (“CVD”) or physical vapor deposition (“PVD”) onto the surface of the substrate. The electrically conductive layer may be formed by direct plating using a specially formulated electrolyte of copper onto a barrier such as Tantalum Nitride (“TaN”), Tantalum (“Ta”), Titanium Nitride (“TiN), or Ruthenium (“Ru”). The additives assist in providing the deposited layer of copper with particular characteristics such as a smooth surface or a shiny appearance. For example, additives commonly used in copper electroplating include, but are not limited to, suppressors, accelerators, levelers, brighteners, grain refiners, wetting agents, and stress reducing agents. Some of these additives affect the rate of deposition during plating in different regions of the substrate depending upon the type of interaction between the additive and the surface of the substrate to which the additive is adsorbed. Once the copper layer has been electroplated, additional processing is performed on the electroplated surface including, but not limited to, etching and/or polishing to remove a portion of the electroplating deposited on the field region or to provide a more workable copper surface for further processing.
In an embodiment, the surface of the substrate being electroplated with copper is substantially flat. In another embodiment, the surface of the substrate being electroplated with copper includes at least one via or interconnect trench. The via or interconnect trench is a recessed structure extending from the surface of the substrate into the thickness thereof. The electroplating processes ideally fills the via or interconnect trench with solid copper without any voids that may adversely affect the conductive properties of the contact plug or interconnect that fills it.
Referring to
In an embodiment, a barrier layer 18 extends over the entire exposed surface of the recessed regions 12, 14. The barrier layer 18 may be formed of Tantalum/Tantalum-Nitride (Ta/TaN), Tantalum/Ruthenium (Ta/Ru), Titanium Nitride (TiN), or any other material or combination of materials sufficient to prevent diffusion of copper ions from the electroplated layer through the barrier layer 18 into the substrate 10 or any other layer adjacent to the barrier layer 18. A seed layer 20 is deposited onto the barrier layer 18. In an embodiment, the seed layer 20 is formed of copper sputtered onto the barrier layer 18. In another embodiment, the seed layer 20 is deposited onto the barrier layer 18 by way of atomic layer deposition (“ALD”) or any other method sufficient to provide a copper seed layer 20. In yet another embodiment, the seed layer is disposed onto the barrier layer using a specially formulated electrolyte. The field region 22 forms the upper surface of the substrate that extends between, and is adjacent to, the openings of the recessed regions 12, 14. It should be understood by one skilled in the art that the seed layer 20 is not necessary to perform an electroplating procedure. Instead, the electroplating procedure can deposit copper by direct plating onto the barrier layer or onto a seed layer.
The recessed regions, formed as vias and/or interconnect trenches, formed through the surface of the substrate provide empty volumes to be filled by a copper electroplating procedure. The recessed regions may be formed through a portion of the thickness of one layer, or the recessed regions may be formed through a portion of more than one layer, such as in three-dimensional integration. These recessed regions may vary in size and shape between each recessed region formed in the substrate. For example, one recessed region formed in a substrate may be a sub-micron-sized via having an opening being less that one micron (<1 μm) across the width of the opening. In another example, a recessed region formed in a substrate may have an opening being between at least one micron (1 μm) and about one hundred microns (100 μm) across the width of the opening. The substrate being electroplated may contain no recessed regions or any number of recessed regions formed therein. Each of the recessed regions may be formed having the same size and shape or each of the recessed regions may be formed having any of a variety of sizes and depths with respect to the other recessed regions formed in the substrate. For example, a recessed region formed through the surface of the substrate or dielectric layer may be very shallow; a recessed region may be formed through the entire thickness of the substrate or dielectric layer; a recessed region may be formed through the entire thickness of one or more dielectric layers; or a recessed region may be formed having any thickness therebetween.
A process of the present invention preferentially adsorbs user-determined additives to particular surfaces of the substrate to which a copper layer is later electroplated, wherein the preferential adsorption is performed prior to the substrate being immersed into an electrolyte solution in which an electroplating procedure is performed. Preferential adsorption, or selective adsorption, provides an improved process that causes user-determined additives to be adsorbed to specific regions of a substrate, whereby the selected additives affect the deposition on the particular region to which they are adsorbed during the electroplating procedure. For example, by preferentially adsorbing particular additives to particular surfaces or recessed regions of the substrate prior to an electroplating procedure, the amount of time to fill a recessed region formed in the substrate during electroplating and removing any deposited material on the field region can be substantially less than the amount of time required to fill the same recessed region and subsequently remove deposited material on the field region when previous electroplating techniques known in the art are used. The reduced time required to remove material deposited onto the field region after the electroplating procedure reduces subsequent processing costs. Additionally, by preferentially adsorbing particular additives to particular surfaces or recessed regions of the substrate prior to an electroplating procedure, the amount of copper deposited on the field regions of the substrate when the recessed regions are filled can be significantly less than the amount of copper deposited on the field regions when previous electroplating techniques known in the art are used.
The preferential adsorption process eliminates the need for additives to be added to the plating bath because the additives are adsorbed to the substrate prior to the substrate being immersed in the plating bath. While the preferential adsorption process eliminates the need for additives in the plating bath, it should be understood that any additives added to the plating bath to enhance the characteristics of the electrodeposited copper should be substantially non-reactive with respect to the anode plate such that the additives do not adversely affect the performance of the anode plate during an electroplating procedure. Additionally, because particular additives are preferentially adsorbed to the substrate prior to immersion into the electrolyte solution in which the electroplating procedure is performed, the membrane typically used to separate these particular additives from the anode plate is eliminated. Further, continuous sampling, testing, and adjusting the concentration of the particular additives in the electrolyte solution is no longer needed when the particular additives that previously adversely affected the performance of the plating bath, thereby eliminating the expenses associated with the machinery for sampling, testing, and adjusting the concentration of these particular additives in the electrolyte solution.
Preferential adsorption includes adsorbing at least one pre-determined additive onto a particular surface, or surfaces, of a substrate prior to the substrate being immersed into an electrolyte solution to be electroplated. It is commonly understood that leveler and suppressor additives typically include large polymeric molecules. When the leveler or suppressor additive molecules adsorb onto the surface of the substrate being processed by electroplating, the leveler and suppressor additive molecules create a relatively high resistance that tends to impede the charge transfer needed for electroplating, thereby substantially reducing the amount of copper electrodeposited onto the surface onto which the leveler or suppressor additive molecules are adsorbed. It is also commonly understood that accelerator additives consist of relatively small molecules, often having a diameter less than one micron (<1 μm). While the accelerator additive molecules also provide a resistance during the electroplating procedure, the resistance due to accelerator additive molecules adsorbed onto a surface is less than the resistance due to leveler or suppressor additive molecules adsorbed onto a similar surface. It is also generally understood that bonds between the nitrogen-containing leveler additive molecules and the copper seed layer are stronger relative to the bonds between sulfur-containing accelerator additive molecules and the copper seed layer. Accordingly, leveler additive molecules effectively displace accelerator additive molecules that may have been previously adsorbed onto a copper seed layer on a substrate.
For recessed regions with small sized openings, typically less than about one hundred micrometers (100 μm) in diameter, formed into a substrate, the leveler and suppressor additive molecules are generally too large to diffuse into the opening of the recessed region and instead adsorb onto the field region and the area immediately surrounding the opening of the recessed region, thereby creating a resistive film that impedes electrodeposition of copper onto the field regions surrounding the openings of the recessed regions. On the other hand, the accelerator additive molecules are small enough to diffuse through the small opening of the recessed regions and adsorb onto each surface of the recessed region, whereby the accelerator additive molecules provide less resistance to electrodeposition relative to the leveler additive molecules to aid in the bottom-up filling of the recessed region during the electroplating procedure. Accordingly, during the electroplating procedure, the recessed regions are quickly filled with copper while comparatively less copper is deposited onto the field regions of the substrate. In an exemplary embodiment, an electroplating procedure using a substrate having accelerator additive molecules preferentially adsorbed onto the surfaces of the recessed region and leveler and/or suppressor additive molecules preferentially adsorbed onto the field regions results in the recessed regions being completely filled with copper while a thin film of copper is deposited onto the field region surrounding a recessed region, wherein the thickness of the thin film is less than about forty percent (40%) of the diameter of the opening of the adjacent recessed region. It should be understood by one skilled in the art that the thickness of the copper film deposited on the field region using the preferential adsorption process provided herein should be significantly less relative to the thickness of the copper film deposited on the field region using electrodeposition procedures previously known in the art, thereby reducing the amount of subsequent processing of the substrate to remove the film of copper on the field regions.
The copper layer deposited onto the field regions by electroplating is generally removed in a subsequent etching or polishing step. The decreased copper deposited onto the field regions due to the preferential adsorption of large leveler additive molecules onto the field regions with respect to the increased copper deposited into the recessed regions due to the preferential adsorption of relatively small accelerator additive molecules onto the surfaces of the recessed regions reduces the additional costs of subsequent CMP processing of the substrate configured to remove the copper layer deposited on the field region.
One method for electroplating a layer of copper onto a substrate having at least one recessed region includes preferentially adsorbing at least one additive onto the substrate prior to immersion of the substrate into an electrolyte solution for copper deposition. In an embodiment, the substrate having at least one recessed region is immersed into a first tank 30, as illustrated in
Once the substrate is immersed in the first tank a sufficient amount of time to allow the additives to adsorb onto the field regions and onto the surfaces of the recessed regions of the substrate, the substrate is removed from the first tank 30 and placed into a second tank 32 to rinse the substrate, as shown in
Once the substrate is dry, the substrate having additives adsorbed onto the surface thereof is immersed into a third tank 34, as illustrated in
In another embodiment, as illustrated in
The substrate is subsequently removed from the first tank 36 and immersed in a second tank 37 to be rinsed with DI water to remove un-adsorbed additive molecules, as illustrated in
After the substrate has been immersed in the first, second, and third tanks 36, 37, 38, the substrate is placed into a fourth tank 40 to rinse the substrate, as shown in
Once the substrate has been rinsed, the substrate is immersed into a fifth tank 42, as illustrated in
It should be understood by one skilled in the art that any number of tanks containing additives can be used to preferentially adsorb a specific additive molecules onto a substrate. It should also be understood by one skilled in the art that the substrate does not need to be dried prior to immersion into the plating bath for electroplating when the substrate is being processed in an automated tool.
In yet another embodiment, accelerator additive molecules are preferentially adsorbed onto the surfaces of the recessed regions formed in a substrate by a spin-on technique and leveler additive molecules are preferentially adsorbed onto the field regions of a substrate by a spin-on technique prior to the substrate being immersed in a plating bath. Spin-on techniques, commonly known in the art, include spinning a substrate while dispensing a small volume of solution onto the surface onto which the solution is to be adsorbed, thereby allowing the rotational forces to spread the solution across the entire surface of the substrate and into any recessed regions formed into the substrate. During a spin-on procedure, the substrate is generally rotated at a low speed while the solution is dispensed thereon. Once the solution is distributed across the surface of the substrate, the substrate is spun at a higher speed to remove the excess solution from the surface of the substrate.
It should be understood by one skilled in the art that the first spin-on procedure of the exemplary preferential adsorption processes illustrated in
It should be understood by one skilled in the art that the spin-on procedures use substantially less solution than immersing the substrate into tanks containing the additives. In alternative embodiments, the preferential adsorption procedures may include only immersion tanks, only spin-on procedures, or a combination thereof.
Prior to the substrate being transferred to the tank 104 for an electroplating procedure, the dispensing mechanism 110 rinses the substrate to remove the un-adsorbed additive molecules. In an embodiment, the dispensing mechanism 110 is in fluid communication with a DI water source 116, or the substrate can be rinsed in any other manner sufficient to remove any un-adsorbed additive molecules. It should be understood by one skilled in the art that the dispensing mechanism 110 can be configured to dispense each of the additives separately, or the dispensing mechanism 110 can be configured to dispense a combination of additives or other fluids in fluid communication therewith. It should also be understood by one skilled in the art that each additive can be in fluid communication with a separate dispensing mechanism 110 configured to dispense the particular additive onto the substrate 108 within the same spin-on mechanism 102.
Once the additives have been adsorbed onto the substrate 108 using a spin-on procedure, the substrate 108 is rinsed before being transported to the tank 104 for an electroplating procedure. As shown in
The preferential adsorption of additives into the recessed regions and onto the field regions of a substrate provides film with a differential resistivity to charge transfer during the electrodeposition of copper therebetween. In the preferred embodiment, the additives preferentially adsorbed onto the surfaces of the recessed regions forming film that is less resistive to charge transfer during the electrodeposition relative to that film which is formed by additives preferentially adsorbed onto the surfaces of the field regions of the substrate. While the above embodiments are configured to preferentially adsorb accelerator additive molecules onto the recessed regions and leveler additive molecules onto the field regions, it should be understood by one skilled in the art that the additives adsorbed to the different regions in these embodiments illustrate the relative resistance in charge transfer between the different regions of the substrate being processed. The preferential adsorption provides a differential between the resistance to electrodeposition in the recessed region and the resistance to electrodeposition on the field regions. Any additives may be adsorbed onto the surfaces of the recessed regions and the field regions provided the resistance to electrodeposition on the field regions is greater than the resistance to electrodeposition in the recessed regions such that the recessed regions are filled quickly with less copper being deposited on the field regions during an electroplating procedure.
While preferred embodiments of the present invention have been described, it should be understood that the present invention is not so limited and modifications may be made without departing from the present invention. The scope of the present invention is defined by the appended claims, and all devices, process, and methods that come within the meaning of the claims, either literally or by equivalence, are intended to be embraced therein.
Claims
1. A method for electroplating a substrate having a field region and at least one recessed region formed therein, said method comprising:
- preferentially adsorbing a first additive to surfaces of said at least one recessed region;
- preferentially adsorbing a second additive to said field region;
- subsequently immersing said substrate into a plating bath; and
- performing an electroplating procedure to deposit copper onto said substrate, wherein said preferentially adsorbed first and second additives cause copper to be electroplated into said at least one recessed region faster than copper is electroplated onto said field region.
2. The method of claim 1, wherein preferentially adsorbing said first additive includes immersing said substrate into a tank containing said first additive.
3. The method of claim 2, wherein preferentially adsorbing said second additive includes immersing said substrate into a second tank containing said second additive.
4. The method of claim 1, wherein preferentially adsorbing said first additive includes using a spin-on technique to distribute a first additive-containing solution over said substrate.
5. The method of claim 1, wherein preferentially adsorbing said second additive includes using a spin-on technique to distribute a second additive-containing solution over said substrate.
6. The method of claim 1, wherein said first additive is an accelerator.
7. The method of claim 1, wherein said second additive is a leveler.
8. The method of claim 1, wherein said plating bath includes copper sulfate (CuSO4).
9. The method of claim 8, wherein said plating bath further includes a suppressor additive.
10. The method of claim 8, wherein said plating bath does not include an accelerator additive.
11. The method of claim 1, wherein said substrate is rinsed with de-ionized water prior to being immersed in said plating bath and after preferentially adsorbing said first and second additives.
12. A method for electroplating a substrate comprising:
- immersing said substrate into a first tank containing an electrolyte solution, said electrolyte solution including a first additive and a second additive, and said first additive is preferentially adsorbed onto surfaces of at least one recessed region formed in said substrate and said second additive is preferentially adsorbed onto a field region of said substrate;
- rinsing excess of said electrolyte solution from said substrate; and
- after rinsing, immersing said substrate into a plating bath for an electroplating procedure, wherein said first additive provides less resistance to electrodeposition of copper than said second additive.
13. The method of claim 12, wherein one of said at least one recessed region has an opening measuring less than one micrometer.
14. The method of claim 12, wherein one of said at least one recessed region has an opening measuring at least one micrometer.
15. The method of claim 12, wherein one of said at least one recessed region has an opening measuring less than one micrometer and a second of said at least one recessed region has an opening measuring at least one micrometer.
16. The method of claim 12, wherein said substrate is immersed in said first tank between about 10 seconds and about 200 seconds.
17. The method of claim 12, wherein said plating bath includes at least one additive different than said first additive and said second additive.
18. The method of claim 12 further comprising removing said electrodeposited layer from said field region.
19. An apparatus for electroplating a substrate having a field region and at least one recessed region formed therein, said apparatus comprising:
- a first tank containing at least a first additive, wherein said substrate is immersable into said first tank, said first additive configured to be preferentially adsorbed onto one of said field region and surfaces of said at least one recessed region;
- a second tank containing at least a second additive, wherein said substrate is immersable into said second tank, said second additive configured to be preferentially adsorbed onto the other of said field region and surfaces of said at least one recessed region; and
- a third tank containing a plating bath into which said substrate is immersable for an electroplating procedure, wherein an anode plate is disposed within said plating bath, and said anode plate is operatively connectable to said substrate through said plating bath to form an electrical circuit for said electroplating procedure.
20. The apparatus of claim 19, wherein said first additive provides a film more resistive to electroplating than said second additive.
21. The apparatus of claim 19, wherein said first and second additives are configured to permit electroplating in said at least one recessed region at a faster rate than onto said field region.
22. The apparatus of claim 19, wherein said at least one recessed region has an opening diameter, and said first and second additives are configured such that electroplating produces a thin film on said field region having a thickness less than about 40% of said opening diameter.
23. An apparatus for electroplating a substrate having a field region and at least one recessed region formed therein, said apparatus comprising:
- a spin-on mechanism configured to preferentially adsorb a first additive onto one of said field region and surfaces of said at least one recessed region and preferentially adsorb a second additive onto the other of said field region and surfaces of said at least one recessed region; and
- a tank containing a plating bath into which said substrate is immersable for an electroplating procedure, wherein an anode plate is disposed within said plating bath, and said anode plate is operatively connectable to said substrate through said plating bath to form an electrical circuit for said electroplating procedure.
24. The apparatus of claim 23, wherein said spin-on mechanism is further configured to rinse said substrate prior to immersing said substrate into said tank.
Type: Application
Filed: Sep 11, 2007
Publication Date: Mar 12, 2009
Applicant: ASM NUTOOL, INC. (Phoenix, AZ)
Inventors: Ayse Durmus (Phoenix, AZ), Ismail Emesh (Gilbert, AZ)
Application Number: 11/853,174
International Classification: C23C 28/02 (20060101); C25D 17/00 (20060101);