Patent ID: 7692214
Filing Date: 2010-04-06
Classification: H01L

Abstract:
1. A semiconductor device comprising: a semiconductor substrate; an IGBT cell arranged in the semiconductor substrate; and a diode cell arranged in the semiconductor substrate, wherein the semiconductor substrate includes a first semiconductor layer having a first conductive type, a second semiconductor layer having a second conductive type, a third semiconductor layer having the first conductive type and a fourth semiconductor layer having the first conductive type, the first semiconductor layer defines a first surface of the semiconductor substrate, the second semiconductor layer and the third semiconductor layer define a second surface of the semiconductor substrate, and are adjacent to each other, the fourth semiconductor layer is sandwiched between the first semiconductor layer and the second and third semiconductor layers, the first semiconductor layer provides a drift layer of a carrier for the IGBT cell and the diode cell, the second semiconductor layer provides a collector layer of the IGBT cell, the third semiconductor layer provides one of electrode connection layers of the diode cell, a resistivity of the first semiconductor layer is defined as ρ a resistivity of the fourth semiconductor layer is defined as ρ a half of a minimum width of the second semiconductor layer on a plane parallel to the second surface of the semiconductor substrate is defined as W