Patent ID: 7064352

Claim:
A diamond semiconductor device comprising: a substrate substantially made of single crystal diamond; a first diamond layer, locally placed on the substrate, containing an impurity; a second diamond layer containing the impurity, the second diamond layer being locally placed on the substrate and spaced from the first diamond layer; and a third diamond layer which has an impurity content less than that of the first and second diamond layers, which acts as a channel region located between the first and second diamond layers, and through which charges are transferred from the first diamond layer to the second diamond layer, wherein the first diamond layer has a first end portion, the second diamond layer has a second end portion facing the first end portion with a space located therebetween, the first and second end portions each have corresponding slopes epitaxially formed depending on the orientation of the substrate, and the third diamond layer lies over the slopes of the first and second end portions and a section of the substrate that is located under the space.