Patent attributes
A semiconductor structure with device trench and a semiconductor device in the device trench, that enables realization of high integration, lowered on-resistance, reduction in switching losses and a high operation speed in a semiconductor device provided with a lateral IGBT, and that prevents malfunctions such as latchup when IGBTs or an IGBT and CMOS devices are integrated together. The structure includes an SOI substrate having a supporting substrate, an oxide film and a p−-semiconductor layer. An island-like element-forming region is isolated by a trench isolation region from surroundings. The trench isolation region includes an isolation trench with an insulation film on its inner wall. The device trench is formed in the element-forming region. A gate electrode is formed with a gate insulator film in the device trench. A collector region and an emitter region outside are provided respectively on the bottom and the outside of the device trench.
