Patent ID: 9105743
Filing Date: 2015-08-11
Classification: H01L

Abstract:
1. A method of manufacturing a semiconductor device comprising: forming a first impurity layer in a first region of a semiconductor substrate by implanting a first impurity of a first conductivity type in the first region; forming a second impurity layer in a second region of the semiconductor substrate by implanting a second impurity of the first conductivity type in the second region, a diffusion constant of the second impurity being smaller than a diffusion constant of the first impurity; forming a semiconductor layer above the semiconductor substrate after forming the second impurity layer; forming a first gate insulating film above the semiconductor layer in the first region and the second region; removing the first gate insulating film in the second region; forming a second gate insulating film thinner than the first gate insulating film above the semiconductor layer in the second region; and forming a first gate electrode above the first gate insulating film and a second gate electrode above the second gate insulating film, wherein a concentration of the first impurity in the semiconductor layer of the first region is lower than a concentration of the first impurity in the first impurity layer, and a concentration of the second impurity in the semiconductor layer of the second region is lower than a concentration of the second impurity in the second impurity layer.