Patent ID: 8329563
Filing Date: 2012-12-11
Classification: H01L

Abstract:
1. A method for manufacturing a semiconductor device, comprising: forming a gettering layer containing an n-type impurity or a p-type impurity on a second surface of a silicon substrate formed by a floating zone method or a magnetic field applied Czochralski method, wherein said silicon substrate has a first surface; heat treating said silicon substrate so that said gettering layer getters dissolved oxygen or residual metal in said silicon substrate; forming a first conductivity type region in said first surface of said silicon substrate; and removing a portion of said gettering layer from said substrate and leaving a remaining portion of the gettering layer having a predetermined thickness as a second conductivity type region, the method further comprising: forming a metal wiring on said first surface after said heat treating said silicon substrate and before said removing said portion of said gettering layer.