Patent ID: 9257448
Filing Date: 2016-02-09
CPC Classification: H01L

Claim Text:
1. A method for forming a semiconductor device, comprising: providing a first wafer comprising a first horizontal surface, an opposite horizontal surface, and a semiconductor layer extending from the first horizontal surface to the opposite horizontal surface; forming at least one insulating region on the opposite horizontal surface, the insulating region partly covering the semiconductor layer; forming a non-monocrystalline semiconductor layer on the opposite horizontal surface, the non-monocrystalline semiconductor layer covering at least the semiconductor layer; providing a second wafer comprising a pn-junction; and waferbonding of the first wafer and the second wafer such that an interface between the non-monocrystalline semiconductor layer and the second wafer is formed, so that a doping concentration of the non-monocrystalline semiconductor layer is at least one order of magnitude lower than the respective doping concentrations of semiconductor regions adjoining the non-monocrystalline semiconductor layer.