摘要:
A new method is provided for the post-deposition treatment of copper lines. A damascene copper line pattern whereby a TaN barrier layer and a seed layer have been provided is polished. Under the first embodiment of the invention, the deposited copper is polished (Cu CMP), the surface of the wafer is rinsed using a first High Flow DI rinse that contains a TBA inhibitor. The TaN CMP is performed immediately following the first High Flow DI rinse. A second High Flow DI rinse is applied using DI water that contains TBA inhibitor. The required following rinse step is executed immediately after the second High Flow DI rinse has been completed. Under the second embodiment of the invention, the process of CMP has been divided in two distinct steps where the first step is aimed at corrosion elimination and the second step is aimed at elimination of mechanical damage to the polished copper. The processing conditions for the second processing step have been extended and optimized, thereby using a second belt of a CMP apparatus.
摘要:
A composite, dual-hardness polishing pad for use in a linear chemical mechanical polishing apparatus and a method for forming the pad are described. In the composite, dual-hardness polishing pad, a pad body is first provided which has a leading edge and a trailing edge for mounting to a linear belt immediately adjacent to a second polishing pad. The pad body is fabricated of a material that has a first hardness, the leading edge contacts an object being polished on the composite polishing pad before the trailing edge when the linear belt turns in a linear polishing process. The composite polishing pad further includes a buffer pad that is adhesively joined to the leading edge of the pad body for contacting the object that is being polished, the buffer pad may be fabricated of a material that has a second hardness which is at least 20% smaller than the first hardness such that impact on the object being polished is minimized during a linear polishing process. The present invention is further directed to a method for adhesively joining a buffer pad to a pad body of a polishing pad.
摘要:
A continuous loop polishing pad that is reinforced by a reinforcing filler and a method for fabricating the polishing pad are described. The reinforced polishing pad is constructed by a sub-layer and a top layer, wherein the sub-layer defines an inner diameter of the polishing pad and contains a reinforcing filler with an aspect ratio of at least 10 oriented substantially in a circumferential direction of the continuous loop polishing pad. The top layer is laminated to the sub-layer with a top surface defining an outer diameter of the polishing pad, while both the sub-layer and the top layer are formed of a polymeric material. The invention further describes a method for fabricating the reinforced polishing pad in a continuous loop.
摘要:
A new method is provided that affects the polishing rate of the surface of a layer of copper, that has been deposited over the surface of a layer of dielectric. Copper damascene structures have been created in the surface of the layer of dielectric, the layer of dielectric also overlies an alignment mark. The surface of the layer of dielectric that is aligned with the alignment mark is provided with dummy damascene structures, assuring equal polishing rates for active damascene structures and the surface region of the layer of dielectric overlying an alignment mark.
摘要:
A method for preventing copper corrosion on a wafer during a chemical mechanical polishing process when the process is temporarily halted due to equipment malfunction and an apparatus for carrying out such method are disclosed. In the method, after the chemical mechanical polishing process is stopped for correcting equipment malfunction or any other processing problems, a cleaning solvent is sprayed toward the wafer surface to remove substantially all slurry solution from the surface to prevent corrosion of the copper layer, or other metal layer, by the slurry solution. The cleaning solvent may be sprayed from spray nozzles mounted around and juxtaposed to the polishing table onto which the polishing pad is mounted as long as the spray nozzles do not interfere with the rotation of the polishing pad.
摘要:
A method of copper metallization wherein copper flaking and metal bridging problems are eliminated by an annealing process is described. A first metal line is provided on an insulating layer overlying a semiconductor substrate. A dielectric stop layer is deposited overlying the first metal line. A dielectric layer is deposited overlying the dielectric stop layer. An opening is etched through the dielectric layer and the dielectric stop layer to the first metal line. A barrier metal layer is deposited over the surface of the dielectric layer and within the opening. A copper layer is deposited over the surface of the barrier metal layer. The copper layer and barrier metal layer not within the opening are polished away wherein after a time period, copper flakes form on the surface of the copper and dielectric layers. The copper layer and the dielectric layer are alloyed whereby the copper layer is stabilized and the copper flakes are removed to complete copper damascene metallization in the fabrication of an integrated circuit.
摘要:
A slurry dispensing unit for a chemical mechanical polishing apparatus equipped with multiple slurry dispensing nozzles is disclosed. The slurry dispensing unit is constructed by a dispenser body that has a delivery conduit, a return conduit and a U-shape conduit connected in fluid communication therein between for flowing continuously a slurry solution therethrough and a plurality of nozzles integrally connected to and in fluid communication with a fluid passageway in the delivery conduit for dispensing a slurry solution. The multiple slurry dispensing nozzles may either have a fixed opening or adjustable openings by utilizing a flow control valve at each nozzle opening.
摘要:
An oxide polishing process that is part of a CMP process flow is disclosed. After a copper layer is polished at a first polishing station and a diffusion barrier layer is polished at a second polishing station, a key sequence at a third polish station is the application of a first oxide slurry and a first DI water rinse followed by a second oxide slurry and then a second DI water rinse. As a result, defect counts are reduced from several thousand to less than 100. Another important factor is a low down force that enables more efficient particle removal. The improved oxide polishing process has the same throughput as a single oxide polish and a DI water rinse method and may be implemented in any three slurry copper CMP process flow.
摘要:
An oxide polishing process that is part of a CMP process flow is disclosed. After a copper layer is polished at a first polishing station and a diffusion barrier layer is polished at a second polishing station, a key sequence at a third polish station is the application of a first oxide slurry and a first DI water rinse followed by a second oxide slurry and then a second DI water rinse. As a result, defect counts are reduced from several thousand to less than 100. Another important factor is a low down force that enables more efficient particle removal. The improved oxide polishing process has the same throughput as a single oxide polish and a DI water rinse method and may be implemented in any three slurry copper CMP process flow.
摘要:
A wafer is attached to a carrier by using an adhesive layer, and a portion of the adhesive layer is exposed adjacent to an edge of the wafer. After thinning the wafer, a protection layer is provided to cover the exposed portion of the adhesive layer. A plurality of dies is bonded onto the thinned wafer, and then the thinned wafer and the dies are encapsulated with a molding compound.