Patent ID: 8933483
Filing Date: 2015-01-13
Classification: H01L

Abstract:
1. A semiconductor device comprising: a main element domain; and a sense element domain disposed adjacent to the main element domain; wherein each of the main element domain and the sense element domain comprises a first semiconductor layer, a second semiconductor layer directly laminated on the first semiconductor layer, and a third semiconductor layer directly laminated on the second semiconductor layer, and an impurity concentration of the second semiconductor layer is lower than that of the first semiconductor layer, an insulating film and a trench gate electrode penetrating the third semiconductor layer and facing the third semiconductor layer via the insulating film: the first semiconductor layer is a continuous layer between the main element domain and the sense element domain, the second semiconductor layer is a continuous layer between the main element domain and the sense element domain, the third semiconductor layer is a continuous layer between the main element domain and the sense element domain via the trench gate and the insulating film, wherein when the semiconductor device turns on, a channel is formed in each of the third semiconductor layers of the main element domain and the sense element domain, and current flows from the second semiconductor layer to the third semiconductor layer or from the third semiconductor layer to the second semiconductor layer, and a thickness of the second semiconductor layer of the sense element domain is smaller than that of the second semiconductor layer of the main element domain.