Patent ID: 9608128
Date: 2017-03-28
CPC Classifications: H01L

Claim:
1. A Semiconductor device with a pn-junction, the semiconductor device comprising: a substrate crystal of doped silicon with a predefined mean free path length for free charge carriers; and an epitaxial crystal layer of an n-doped silicon on the substrate crystal, wherein a pn-junction is formed between the semiconductor crystal and the crystal layer or at a side of the crystal layer opposite to the semiconductor crystal, wherein the crystal layer comprises at least locally non-doping germanium atoms or carbon atoms, or both, as scattering centers introduced during the crystal growth and the crystal layer has a mean free path length for free charge carriers smaller than the predefined mean free path length, and wherein the mean free path length in the n-doped crystal layer varies such that the mean free path length is more reduced, relative to the predefined mean free path length, in those areas of the n-doped crystal layer in which an electrical field strength is higher when a blocking voltage is applied to the pn-junction, and such that the mean free path length is reduced less, relative to the predefined mean free path length, in those areas of the n-doped crystal layer where the field strength is smaller when a blocking voltage is applied to the pn-junction.