Patent ID: 6476431
Filing Date: 2002-11-05
Classification: H01L

Abstract:
A field effect transistor, comprising:a gate electrode; a first conductive type channel layer; a second conductive type substrate; a first conductive type layer, which is provided between the second conductive type substrate and the first conductive type channel layer, and which is depleted; and a second conductive type layer, the first conductive type layer and the second conductive type layer, which are provided between the first conductive type channel layer and the second conductive type substrate, forming a potential barrier, wherein the potential barrier formed by the first conductive type layer and the second conductive type layer serves as a barrier for preventing a second conductive type carrier from flowing out of the second conductive type substrate in a direction of the gate electrode even when a large voltage is applied to the gate electrode, the large voltage being larger than a bias voltage required for cutting off a channel of the first conductive type channel layer.