Invention Grant
- Patent Title: Electro-chemical mechanical planarization pad with uniform polish performance
- Patent Title (中): 电化学机械平面化垫具有均匀的抛光性能
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Application No.: US11562310Application Date: 2006-11-21
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Publication No.: US07815778B2Publication Date: 2010-10-19
- Inventor: Rajeev Bajaj
- Applicant: Rajeev Bajaj
- Applicant Address: US CA San Jose
- Assignee: Semiquest Inc.
- Current Assignee: Semiquest Inc.
- Current Assignee Address: US CA San Jose
- Agency: Sonnenschein Nath & Rosenthal LLP
- Main IPC: B23H5/06
- IPC: B23H5/06 ; B23H5/08 ; B23H5/10 ; C25F3/16 ; C25F3/18 ; C25F3/30

Abstract:
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.
Public/Granted literature
- US20070131564A1 Electro-Chemical Mechanical Planarization Pad With Uniform Polish Performance Public/Granted day:2007-06-14
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