Patent ID: 8076173
Filing Date: 2011-12-13
Classification: H01L

Abstract:
1. A method of producing a semiconductor device comprising: a first irradiating step of irradiating a first principal surface of a semiconductor substrate of a first conductivity type having a carbon concentration of 6.0 ×10 a heat-treating step of heat treating the semiconductor substrate at a temperature of 200° C. to 350° C., both inclusively, to form a region having a locally maximized net doping concentration and a region having carrier lifetime values shorter than an average carrier lifetime of minority carriers of the semiconductor substrate, in the semiconductor substrate; a grinding step of grinding a second principal surface of the semiconductor substrate; an implanting step of implanting an impurity of the first conductivity type into the ground second principal surface of the semiconductor substrate; and a second irradiating step of irradiating the ground second principal surface implanted with the impurity of the first conductivity type, with a laser beam to electrically activate the implanted impurity.