Patent ID: 8486813
Filing Date: 2013-07-16
Classification: H01L

Abstract:
1. A method of fabricating a silicon wafer, comprising: thermally processing the silicon wafer to form a denuded zone and a bulk area in the silicon wafer; loading the thermally processed silicon wafer into a heating apparatus at a loading temperature and performing a first annealing process on the silicon wafer at a first temperature to supplementally generate oxygen precipitate nuclei and oxygen precipitates in the bulk area; and performing a second annealing process on the silicon wafer at a second temperature higher than the first temperature to enlarge the oxygen precipitates in the bulk area, wherein the thermally processing of the silicon wafer occurs prior to the loading of the thermally processed silicon wafer; and the thermally processing of the silicon wafer comprises performing a first thermal process and a second thermal process on the silicon wafer, the second thermal process being performed at a lower temperature than the first thermal process and forming the oxygen precipitate nuclei in the bulk area.