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Date of Publication:2017-01-01

Journal:光学精密工程

Volume:25

Issue:10

Page Number:2689-2696

ISSN No.:1004-924X

Abstract:A new Soft Abrasive Grinding Wheel (SAGW) was developed for Chemo-mechanical Grind-ing (CMG) of silicon wafers to overcome the surface/subsurface damage of the silicon wafer machined by traditional ultra-precision grinding .According to the principle of the CMG and the material charac-teristics of monocrystalline silicon ,the SAGW took the cerium oxide (CeO2 ) as abrasive ,silicon diox-ide (SiO2 )as additive ,and the chlorine oxide magnesium as binding agent .The preparation process of the SAGW was investigated ,and its microstructure and composition were analyzed .By measuring the surface roughness ,surface microstructure and the surface/subsurface damage ,the grinding perform-ance of the SAGW was further explored .In the end ,fabricated silicon wafer with the same particle size by the SAGW ,Chemical Mechanical Polishing (CMP) and diamond grinding wheel was compared and analyzed .The results show that the surface roughness of the silicon wafer by the SAGW is less than 1 nm and its subsurface damage layer is about 30 nm in thickness ,which is comparable to that produced by the CMG and much better than that of the diamond wheel .This study demonstrates that the developed SAGW achieves the low-damage grinding of silicon wafers .

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