Patent ID: 8748225
Filing Date: 2014-06-10
Classification: H01L

Abstract:
1. A semiconductor device manufacturing method, comprising: a first semiconductor region formation step of forming a second conductivity type first semiconductor region on a first main surface of a first conductivity type wafer; a front surface element structure formation step of forming a front surface element structure on the first main surface of the wafer; a depressed portion formation step of forming a depressed portion reaching the first semiconductor region from a second main surface of the wafer; a second semiconductor region formation step of forming a second conductivity type second semiconductor region electrically connected to the first semiconductor region on the second main surface of the wafer; and an electrode formation step of forming an electrode formed from an electrode film of at least more than one layer over the whole surface of the second semiconductor region, wherein in the electrode formation step, the thickness of the outermost electrode film of the electrode formed on a side wall of the depressed portion is 0.05 μm or less.