Patent ID: 8999061
Filing Date: 2015-04-07
Classification: C30B,H01L,Y10S

Abstract:
1. A method for producing a silicon epitaxial wafer, comprising: a growth step at which an epitaxial layer is grown on a silicon single crystal substrate; a first polishing step at which, before the growth step, both main surfaces of the silicon single crystal substrate are subjected to rough polishing performed by pressing force simultaneously under a condition of no abrasive grains; and a second polishing step at which, after the growth step, the both main surfaces of the silicon single crystal substrate are subjected to finish polishing simultaneously, wherein the first polishing step is the only polishing step performed in which the both main surfaces of the silicon single crystal substrate are subjected to the rough polishing performed by the pressing force simultaneously under the condition of no abrasive grains, before the growth step, and a polishing amount of the polishing performed by the pressing force under the condition of no abrasive grains in the first polishing step is 5 to 30 μm.