Patent ID: 6281519
Filing Date: 2001-08-28
Classification: B82Y,G11B,G11C,H01L

Abstract:
A quantum semiconductor device, comprising:a semiconductor substrate;an undoped active layer formed on said semiconductor substrate, said active layer including a quantum structure; andan accumulation layer provided on said semiconductor substrate adjacent to said active layer, said quantum structure including:an undoped barrier layer of a first semiconductor crystal having a first lattice constant and a first bandgap; anda plurality of self-organized quantum dots each formed of a second semiconductor crystal having a second lattice constant different from said first lattice constant and a second bandgap smaller than said first bandgap, said second semiconductor crystal forming a strained heteroepitaxial system to said first semiconductor crystal, said plurality of self-organized quantum dots having respective quantum levels, and said second semiconductor crystal having a composition set such that said quantum level of said self-organized quantum dots are located higher than a conduction band edge of said accumulation layer.