Patent ID: 9041050
Filing Date: 2015-05-26
Classification: H01L

Abstract:
1. An injection enhancement (IE) type trench insulated gate bipolar transistor (IGBT) comprising: (a) a semiconductor substrate having first and second main surfaces; (b) a drift area disposed in the semiconductor substrate and having a first conductive type; (c) a cell formation area disposed on the first main surface; (d) a plurality of linear unit cell areas disposed in the cell formation area and each having first and second linear unit cell areas; (e) a metal gate electrode disposed on the first main surface; and (f) a metal emitter electrode disposed on the first main surface; the first linear unit cell areas each including: (x1) a linear active cell area disposed from the first main surface over an inner part of the drift area; (x2) first and second linear trench gate electrodes connected electrically to the metal gate electrode and disposed in first and second trenches in the first main surface, respectively, so as to hold the linear active cell area between the first and second linear trench gate electrodes from both sides; (x3) a body area disposed in a surface area on the side of the first main surface of the drift area and having a second conductive type opposite to the first conductive type; (x4) linear inactive cell areas disposed adjacently to both sides of the linear active cell area so as to hold the linear active cell area between the linear inactive cell areas from both sides while defining the first and second linear trench gate electrodes as boundaries; (x5) a floating area disposed in substantially all of a surface area on the side of the first main surface in the linear inactive cell areas deeper than the body area and having the same conductive type as that of the body area; and (x6) an emitter area of the first conductive type disposed in the surface area on the side of the first main surface of the body area; the second linear unit cell areas each including: (y1) a linear hole collector cell area disposed from the first main surface over the inner part of the drift area; (y2) third and fourth linear trench gate electrodes connected electrically to the metal emitter electrode and disposed in third and fourth trenches in the first main surface, respectively, so as to hold the linear hole collector cell area between the third and fourth linear trench gate electrodes from both sides; (y3) the body area disposed in the surface area on the side of the first main surface of the drift area; (y4) the linear inactive cell areas disposed adjacently to both sides of the linear hole collector cell area so as to hold the linear hole collector cell area between the third and fourth linear trench gate electrodes from both sides while defining the third and fourth linear trench gate electrodes as boundaries; and (y5) the floating area disposed in substantially all of the surface area on the side of the first main surface in the linear inactive cell area deeper than the body area and having the same conductive type as that of the body area, wherein a depth of the floating area is deeper than a lower end of the first and second trenches.