Patent ID: 9570541
Date: 2017-02-14
CPC Classifications: H01L

Claim:
1. A semiconductor device comprising: a semiconductor substrate of a first conduction type; a second-conduction-type semiconductor region, the second-conduction-type semiconductor region being selectively formed in a surface layer of one main surface of the semiconductor substrate in an active portion in which a main current flows; an annular second-conduction-type breakdown voltage structure region, the annular second-conduction-type breakdown voltage structure region being selectively formed in the surface layer of the one main surface of the semiconductor substrate in an annular termination breakdown voltage region that surrounds the outer circumference of the second-conduction-type semiconductor region; and a first-conduction-type high-concentration surface region including H wherein an impurity concentration of the first-conduction-type high-concentration surface region is higher than an impurity concentration of the semiconductor substrate and is lower than an impurity concentration of the second-conduction-type semiconductor region; wherein the depth of the first-conduction-type high-concentration surface region is less than the depth of the second-conduction-type breakdown voltage structure region; and wherein the first-conduction-type high-concentration surface region includes an oxygen concentration in a range as follows: 1×10