Patent ID: 8987783
Filing Date: 2015-03-24
Classification: H01L

Abstract:
1. A semiconductor heterostructure comprising: a substrate; a buffer layer deposited on or over said substrate; a spacing layer deposited on or over said buffer layer; and a barrier layer deposited on said spacing layer; in which heterostructure: doping is provided in the barrier layer or at the interface between the spacing layer and the barrier layer; and said barrier and spacing layers are made of one or more semiconductor materials presenting a forbidden band wider than that of the materials constituting said buffer layer; the heterostructure being characterized in that: said barrier layer comprises a first barrier sublayer in contact with said spacing layer and a second barrier sublayer spaced apart from said spacing layer; and in that said second barrier sublayer presents a forbidden band that is wider than the forbidden band of said first barrier sublayer, and wherein said barrier layer is made of a semiconductor material containing aluminum, said second barrier sublayer presenting an aluminum content that is higher than that of said first barrier sublayer.