Patent ID: 6683013
Filing Date: 2004-01-27
Classification: B82Y,H01L

Abstract:
A method of forming a quantum dot array, the method comprising the steps of:preparing a substrate having a constant crystallographic axis and a (100) GaAs surface tilted from 1 to 8 degrees with respect to the crystallographic axis; forming a GaAs buffer layer on the substrate by a chemical vapor deposition or chemical beam epitaxy, the buffer layer being made of the same material as the substrate; and growing an InAs material layer having a lattice constant which is different from that of the substrate, wherein partial pressure of AsH3 source gas is adjusted to 1.2Ã—10âˆ’3 atm, and a thickness of the GaAs buffer layer is adjusted to range from 43 to 120 monolayers and the thickness of the InAs material layer is adjusted to range from 2 to 2.5 monolayers during the formation of the buffer layer and the material layer so that sizes of quantum dots are restricted in a direction perpendicular to a step line direction due to an atomic bonding of step binding and the sizes of the quantum dots increase in a direction parallel to the step line direction, thereby obtaining quantum wires or chained quantum dots or 1-dimensionally arrayed quantum dots arrayed of good quality.