Patent ID: 8803197
Filing Date: 2014-08-12
Classification: H01L

Abstract:
1. A semiconductor wafer comprising: a base wafer, a first crystalline layer, a second crystalline layer, and an insulating layer that are positioned in the stated order, the semiconductor wafer further comprising: a third crystalline layer positioned either between the first crystalline layer and the second crystalline layer or between the base wafer and the first crystalline layer, wherein the second crystalline layer is made of a crystal that either lattice matches or pseudo lattice matches a crystal making the first crystalline layer, and has a wider band gap than the crystal making the first crystalline layer, the third crystalline layer is made of a crystal that either lattice matches or pseudo lattice matches the crystal making the first crystalline layer, and has a wider band gap than the crystal making the first crystalline layer, the third crystalline layer includes a first atom that will be a donor or an acceptor, and when the third crystalline layer includes a first atom that will be a donor, the second crystalline layer includes a second atom that will be an acceptor, and when the third crystalline layer includes a first atom that will be an acceptor, the second crystalline layer includes a second atom that will be a donor.