Nanopolishing of silicon wafers using ultrafine-dispersed diamonds |
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Authors: | T Kurobe T Fujimura H Ikeda |
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Institution: | (1) Vision Development Company Limited, Tokyo 104-0031, Japan;(2) Institute of Development of Raw Materials and Industrial Technologies, Tokyo 104-0031, Japan |
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Abstract: | In the present study, two new methods are proposed for the polishing of silicon wafers using ultrafine-dispersed diamonds (UDDs). The first proposed polishing method uses a polishing tool with an ultrafine abrasive material made through the electrophoretic deposition of UDDs onto a brass rod. Dry polishing tests showed that the surface roughness of the silicon wafer was reduced from Ra=107 to 4 nm after polishing for 30 min. The second method uses a new polishing pad with self-generating porosity. By polishing with the new pad in combination with the polycrystalline UDD in a water suspension, it is possible to achieve the specified surface roughness of the silicon wafer much faster than when using a conventional pad made of foamed polyurethane. The tests showed that the surface roughness of the silicon wafer was reduced from Ra=107 to 2 nm after polishing for 90 min. |
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