Patent ID: 9559196
Date: 2017-01-31
CPC Classifications: H01L

Claim:
1. A semiconductor wafer comprising: a base wafer; a first semiconductor portion that is formed on the base wafer and includes a first channel layer containing a majority carrier of a first conductivity type; a separation layer that is formed over the first semiconductor portion and has (i) an electron trap center to trap electrons, the electron trap center being lower than a boundary of a conduction band of the separation layer by 0.25 eV or more, and (ii) a hole trap center to trap holes, the hole trap center being higher than a boundary of a valence band of the separation layer by 0.25 eV or more; and a second semiconductor portion that is formed over the separation layer and includes a second channel layer containing a majority carrier of a second conductivity type opposite to the first conductivity type, wherein the electron trap center and the hole trap center are formed by doping the separation layer with a butylether gas containing an oxygen atom.