| 摘要 |
A semiconductor device 100, a vertical IGBT, includes a collector electrode 2, a p+-type collector layer 4, an n+-type buffer layer 6, an n--type drift layer 8, a p--type body region 10, an n+-type emitter region 12, a gate electrode 18, and an emitter electrode 14. The semiconductor device 100 includes uneven portions 32 in a back surface, each of which includes a recessed portion 28 and a protrusion portion 30. A gap L2 between bottom faces of the adjacent recessed portions 28 is 70% of or smaller than a thickness L1 of the buffer layer 6. Therefore, the buffer layer 6 is continuously formed, at a certain depth from the bottom faces of the recessed portions. |
