摘要:
A method for forming a copper interconnect on an integrated circuit (IC) begins by forming a dielectric layer (20) having an opening. A tantalum-based barrier layer (21), such as TaN or TaSiN, is formed within the opening in the layer (20). A copper layer (22) is formed over the barrier layer (21). A first CMP process is used to polish the copper (22) to expose portions of the barrier (21). A second CMP process which is different from the first CMP process is then used to polish exposed portions of the layer (21) faster than the dielectric layer (20) or the copper layer (22). After this two-step CMP process, a copper interconnect having a tantalum-based barrier is formed across the integrated circuit substrate (12).
摘要:
A method for chemical mechanical polishing (CMP) a copper layer (22) begins by forming the copper layer (22). The copper layer (22) is then exposed to a slurry (24). The slurry (24) contains an oxidizing agent such as H.sub.2 O.sub.2, a carboxylate salt such as ammonium citrate, an abrasive slurry such as alumna abrasive, an optional triazole or triazole derivative, and a remaining balance of a solvent such as deionized water. The use of the slurry (24) polishes the copper layer (22) with a high rate of removal whereby pitting and corrosion of the copper layer (22) is reduced and good copper interconnect planarity is achieved. This slurry (24) has good selectivity of copper to oxide, and results in copper devices which have good electrical performance. In addition, disposal of the slurry (24) is not environmentally difficult since the slurry (24) is environmentally sound when compared to other prior art slurries.
摘要翻译:通过形成铜层(22)开始化学机械抛光(CMP)铜层(22)的方法。 然后将铜层(22)暴露于浆料(24)。 浆料(24)含有氧化剂如H 2 O 2,羧酸盐如柠檬酸铵,研磨浆如校准研磨剂,任选的三唑或三唑衍生物,剩余的溶剂如去离子水。 浆料(24)的使用以高的去除速度抛光铜层(22),从而降低了铜层(22)的点蚀和腐蚀,并实现了良好的铜互连平面性。 这种浆料(24)具有铜对氧化物的良好选择性,并且导致具有良好电性能的铜器件。 此外,浆料(24)的处理不是环境困难的,因为与其它现有技术的浆料相比,浆料(24)是无害环境的。
摘要:
A polishing system (10) is used to polish a semiconductor wafer (16) in accordance with the present invention. Polishing system (10) includes a wafer carrier (14) which includes a modulation unit (20). Modulation unit (20) includes a plurality of capacitors made up of a flexible lower plate (22) and a plurality of smaller upper plate segments (24). A controller (40) monitors the capacitance between each smaller upper plate segment (24) and lower plate (22), and compares the measured capacitance against a predefined set capacitance. To the extent the measured capacitance and predefined capacitance are different, controller (40) adjusts the voltage being applied to the respective upper plate segment (24) so that the measured capacitance and predefined capacitance are aligned. Thus, the present invention is able to achieve dynamic and localized control of the shape of the wafer as it is being polished.
摘要:
A process of polishing two dissimilar conductive materials deposited on semiconductor device substrate optimizes the polishing of each of the conductive material independently, while utilizing the same polishing equipment for manufacturing efficiency. A tungsten layer (258) and a titanium layer (256) of a semiconductor device substrate (250) are polished using one polisher (10) but two different slurry formulations. The two slurries can be dispensed sequentially onto the same polishing platen (132) from two different urce containers (111 and 112), wherein the first slurry is dispensed until e tungsten is removed and then the slurry dispense is switched to second slurry for removal of the titanium. In a preferred embodiment, the first slurry composition is a ferric nitrate slurry while the second slurry composition is an oxalic acid slurry.
摘要:
A process of polishing two dissimilar conductive materials deposited on semiconductor device substrate optimizes the polishing of each of the conductive material independently, while utilizing the same polishing equipment for manufacturing efficiency. A tungsten layer (258) and a titanium layer (256) of a semiconductor device substrate (250) are polished using one polisher (10) but two different slurry formulations. The two slurries can be dispensed sequentially onto the same polishing platen (132) from two different source containers (111 and 112), wherein the first slurry is dispensed until the tungsten is removed and then the slurry dispense is switched to the second slurry for removal of the titanium. In a preferred embodiment, the first slurry composition is a ferric nitrate slurry while the second slurry composition is an oxalic acid slurry.
摘要:
A method for polishing a metal layer (20) containing a combination of wide features (12), low density features (14), and high density features (18), is illustrated. A hydrophilic polish pad (24) having a shore D hardness of greater than 50 is used along with slurry (22) containing silica and an acidic based oxidizer such as oxadic acid in a chemical mechanical polishing (CMP) process. The result is less than 5:1 and preferably 1:1. This low selectivity results in the metal layer (20) being polished to a level below the surface of the surrounding oxide in a timed-controlled polish.
摘要:
A method of chemical mechanical planarization of a semiconductor device provides a semiconductor device having a device front surface and a device back surface with the device front surface being a top surface of a second metal layer. A first planarizing step planarizes the device front surface with a first medium to expose a device second front surface, where the first medium comprises a first abrasive component and a first chemical solution. A rinsing step then rinses the device back surface with water. A second planarizing step then planarizes the device second front surface with a second medium where the second medium comprises a second abrasive component and a second chemical solution.
摘要:
A polishing pad conditioning apparatus includes a laser beam generating unit for providing a laser beam, a fluid delivery system for providing a fluid stream and a vacuum line for removing debris. The laser beam may directly impinge on a surface of a polishing pad thereby creating cutting action, while an atomized fluid stream provides cooling and pad debris along with fluid are removed thru the vacuum line. Alternatively, the laser beam may be combined with the atomized fluid stream in a region above the pad surface to substantially impart part of its energy to the fluid stream, generating high energy droplets which provide “cool” cutting action on the pad surface.
摘要:
Polishing pads with homogeneous bodies having discrete protrusions thereon are described. In an example, a polishing pad for polishing a substrate includes a homogeneous body having a polishing side and a back side. The homogeneous body is composed of a material having a first hardness. A plurality of discrete protrusions is disposed on and covalently bonded with the polishing side of the homogeneous body. The plurality of discrete protrusions is composed of a material having a second hardness different from the first hardness. Methods of fabricating polishing pads with homogeneous bodies having discrete protrusions thereon are also described.
摘要:
A polishing pad includes at least one conductive polishing element supported by a compressible under layer having conductive patterning therein, the conductive patterning adapted to permit coupling of a potential to the conductive polishing element; a guide plate above the compressible under layer, the guide plate having a hole through which the polishing element passes and further having a cathodic element connected thereto; and a slurry distribution layer adhered to the guide plate opposite the compressible under layer. The polishing pad may further include a proton exchange membrane placed over the cathodic element. A semiconductor wafer having a metal film thereon may be polished using the polishing pad by placing the wafer in contact with the polishing element, applying anodic current to the polishing element and cathodic current to the cathodic element, and polishing with an anodic solution. For copper films, a sulfuric acid-copper sulfate solution may be used.