Patent ID: 7230285
Filing Date: 2007-06-12
Classification: H01L

Abstract:
1. A semiconductor device comprising: an n-type first semiconductor layer formed so that electrons are externally injected into the first semiconductor layer; a p-type second semiconductor layer formed so that electrons injected into the first semiconductor layer are injected into the second semiconductor layer; and an n-type third semiconductor layer formed so that electrons having passed through the second semiconductor layer flow into the third semiconductor layer, the first, second and third semiconductor layers being in contact with one another in this order, wherein spontaneous polarizations Psp wherein the second semiconductor layer is formed so as to have a configuration in which an internal electric field is generated so that an energy of electrons decreases in the direction from the first semiconductor layer to the third semiconductor layer due to an electric charge Q wherein each of the first and third semiconductor layers is formed of aluminum gallium nitride, and wherein the second semiconductor layer is formed of gallium nitride, wherein in the first semiconductor layer, while a contact layer of n-type gallium nitride is in contact with a surface of the first semiconductor layer located on an opposite side to the second semiconductor layer, a thin layer portion is formed, with an interface with the contact layer, so as to have a smaller thickness than that of other part, and wherein an electrode for injecting electrons is in contact with the thin layer portion.