Patent ID: 8030180
Filing Date: 2011-10-04
Classification: B81C

Abstract:
1. A method of manufacturing a semiconductor device in a silicon on insulator (SOI) wafer having a silicon active layer, a supporting substrate layer, and a buried oxide (BOX) layer sandwiched between the silicon active layer and the supporting substrate layer, comprising: forming a resist pattern as an etching mask on the silicon active layer; performing a first etching process to selectively etch the silicon active layer using the etching mask to form a trench penetrating the silicon active layer and reaching the BOX layer, the trench being disposed along a scribe line with a predetermined width; ashing the resist pattern after the first etching process; after ashing the resist pattern, performing a second etching process to selectively etch the BOX layer exposed by the trench so that the trench extends to reach the supporting substrate layer; and cutting the supporting substrate layer along the scribe line by use of a dicing apparatus having a blade width smaller than the predetermined width.