Patent ID: 9455148
Filing Date: 2016-09-27
CPC Classification: H01L

Claim Text:
1. A method for manufacturing a semiconductor device comprising: forming an insulating film on a main surface of a semiconductor substrate that includes an active region and a termination region; etching the insulating film in the active region to form a first opening; using the insulating film as a mask and implanting an impurity into the semiconductor substrate in a direction tilted by 20° or more from a direction normal to the main surface of the semiconductor substrate while rotating the semiconductor substrate to form a diffusion layer in the active region; etching the insulating film in the termination region to form a second opening while forming the first opening simultaneously; and implanting the impurity into the semiconductor substrate to form the diffusion layer in the active region and a ring layer in the termination region simultaneously, wherein the diffusion layer extends wider than the first opening up to below the insulating film on the termination region side.