Patent ID: 7534710
Filing Date: 2009-05-19
Classification: B82Y,G11C,H01L,Y10S

Abstract:
1. A method for forming a device structure, comprising: providing a precursor structure that comprises: (i) two or more conducting layers, (ii) two peripheral insulating layers, and (iii) one or more intermediate insulating layers, wherein said two or more conducting layers are sandwiched between the two peripheral insulating layers and spaced apart from one another by the one or more intermediate insulating layers, forming two or more quantum wells for quantum-mechanical confinement of free electrons; and fabricating two or more conductive contacts in said precursor structure, wherein each of said conductive contacts is directly and selectively connected with one of the two or more conducting layers, thereby forming a device structure having direct and selective contacts for quantum wells, wherein the two or more conducting layers of the precursor structure each comprise GaAs, wherein the peripheral and intermediate insulating layers of the precursor structure each comprise GaAlAs, and wherein a first conductive contact directly and selectively contacting a lowermost conducting layer of said precursor structure is fabricated by a process comprising: