Patent ID: 8987782
Filing Date: 2015-03-24
Classification: H01L

Abstract:
1. A semiconductor wafer comprising: a first semiconductor that contains a Group 3-5 compound semiconductor; a carrier-trapping layer that is formed directly or indirectly on the first semiconductor and has an electron-trapping center or a hole-trapping center, wherein the carrier-trapping layer contains a boron atom or an oxygen atom; a second semiconductor that is epitaxially grown directly or indirectly on the carrier-trapping layer and serves as a channel in which free electrons or free holes move; a third semiconductor including a stack represented by n-type semiconductor/p-type semiconductor/n-type semiconductor or represented by p-type semiconductor/n-type semiconductor/p-type semiconductor, the stack epitaxially grown directly or indirectly on the second semiconductor; and a p-type semiconductor layer that is disposed between the carrier-trapping layer and the second semiconductor and adjacent to an n-type semiconductor such that a depleted region is formed in a vicinity of a junction between the p-type semiconductor layer and the n-type semiconductor, wherein the p-type semiconductor layer includes a p-type Al the p-type Al