Patent ID: 6696313
Filing Date: 2004-02-24
Classification: B82Y,H01L,H01S,Y10S

Abstract:
A method for fabricating a semiconductor device having quantum dots, comprising the steps of:preparing a substrate; growing a superlattice strained layer by alternately depositing at least two semiconductor materials having different lattice constant by a predetermined cycle; forming a quantum-dot active layer including quantum dots on the superlattice strained layer, where the quantum dots are aligned on the superlattice strained layer along an internal strain of the superlattice strained layer; wherein the internal strain is induced by the alternate deposition during the predetermined cycle, and the predetermined cycle is determined in consideration of the internal strain, wherein the predetermined cycle is determined to make a thickness of the superlattice strained layer be wider than a critical thickness inducing a lattice relaxation of the superlattice strained layer because of the internal strain.