Patent ID: 9379181
Filing Date: 2016-06-28
CPC Classification: H01L

Claim Text:
1. A semiconductor device comprising: a semiconductor substrate in which a power semiconductor element part and a temperature sensing diode part are provided, wherein the temperature sensing diode part includes: a first semiconductor region that is a first conductivity type and arranged in a range that faces an upper surface of the semiconductor substrate; a second semiconductor region that is a second conductivity type and arranged in a region that faces the upper surface of the semiconductor substrate; a third semiconductor region that is the first conductivity type and arranged in a range that faces the upper surface of the semiconductor substrate; a fourth semiconductor region that is the second conductivity type and arranged in a range that faces the upper surface of the semiconductor substrate; a first base region that is the first conductivity type, arranged in a range that faces the upper surface of the semiconductor substrate, and in contact with and surrounds the first semiconductor region and the second semiconductor region; a first drift region that is the second conductivity type, in contact with a lower surface of the first base region, and isolated from the first semiconductor region and the second semiconductor region by the first base region, a second base region that is the first conductivity type and in contact with lower surfaces of the third semiconductor region and the fourth semiconductor region; a second drift region that is the second conductivity type, located below the second base region, and isolated from the third semiconductor region and the fourth semiconductor region by the second base region; a first gate electrode that is arranged in a gate trench passing through the second base region and extending to the second drift region, and faces the second base region in a range that isolates the fourth semiconductor region and the second drift region from each other; and a first insulator arranged between the first gate electrode and an inner wall of the gate trench, an isolation trench is disposed in the semiconductor substrate, the isolation trench passing through the first base region, extending to the first drift region, and surrounding an outer periphery of the temperature sensing diode part, at least a part of one of side walls of the isolation trench is in contact with the power semiconductor element part, and the other side wall of the isolation trench is in contact with the temperature sensing diode part, and a second insulator is arranged in the isolation trench, wherein the thickness of the second insulator is larger than a thickness of the first insulator.