Patent ID: 9318391
Filing Date: 2016-04-19
CPC Classification: H01L

Claim Text:
1. A method for manufacturing a semiconductor device comprising: laminating an oxide film layer and a semiconductor layer of a first-conductive-type on a semiconductor layer of a second-conductive-type in order; forming an active region of the first-conductive-type in the semiconductor layer of the first-conductive-type; forming an insulating film on the semiconductor layer of the first-conductive-type; forming a first region of the first-conductive-type by diffusing, based on a position of the active region of the first-conductive-type, an impurity of the first-conductive-type within a first region of the semiconductor layer of the second-conductive-type that includes a lower portion of the active region of the first-conductive-type; forming a MOS-type transistor in the active region of the first-conductive-type; removing the oxide film layer from a predetermined region, the predetermined region being a region of the semiconductor layer of the first-conductive-type in which a first electrode, a second electrode and a third electrode are to be formed; forming, in the first region of the first-conductive-type, a second region of the first-conductive-type by diffusing the impurity of the first-conductive-type within the predetermined region from which the oxide film layer has been removed and on which the first electrode is to be formed and, forming a third region of the first-conductive-type by diffusing the impurity of the first-conductive-type within the predetermined region on which the third electrode is to be formed; forming a region of the second-conductive-type by diffusing an impurity of the second-conductive-type within the predetermined region from which the oxide film layer has been removed and in which the second electrode is to be formed; and forming the first electrode, the second electrode and the third electrode.