Patent ID: 7820541

Claim:
A method for forming a low defect density heterojunction between a first and a second compound, the first and second compounds each includes a group III element combined with a group V element in the periodic table, the method comprising: introducing in a molecular beam epitaxy deposition chamber a flux of the group III and V elements for the first compound to form a first single layer consisting of the group III and V elements for the first compound, the first single layer having a first top surface comprising the group III and V elements for the first compound; stopping the flux of the group III element for the first compound after a first predetermined time period while continuing the flux of the group V element for the first compound to form a group V layer on the first top surface comprising the group III and V elements for the first compound; stopping the flux of the group V element for the first compound after a second predetermined time period, to form a second top surface comprising the group V element for the first compound; introducing simultaneously in the molecular beam epitaxy deposition chamber a flux of the group III element and the group V element for the second compound to form a second single layer consisting of the group III and V elements for the second compound on the second top surface comprising the group V element for the first compound; and stopping the flux of the group III and V elements for the second compound after a third predetermined time period.