Patent ID: 9029243
Filing Date: 2015-05-12
Classification: H01L,Y10S

Abstract:
1. A method for producing a semiconductor device, comprising: providing a wafer comprising a main surface and a silicon layer arranged at the main surface and having a nitrogen concentration of at least about 3*10 partially out-diffusing nitrogen to reduce the nitrogen concentration at least close to the main surface such that the nitrogen concentration of the silicon layer is reduced by at least a factor of two at least in a first portion extending from the main surface to a depth of about 50 μm and that an oxygen concentration of the silicon layer drops by at least 10% in the last 10 μm towards the main surface; oxidizing the wafer at least at the main surface after partially out-diffusing the nitrogen; and implanting protons to form at least one n-type silicon layer in the silicon layer.