Patent ID: 6011904
Filing Date: 2000-01-04
Classification: C30B

Abstract:
A molecular beam epitaxy effusion cell for growing epitaxial layers upon a semiconductor substrate by control of a collimated beam of molecules generated from a source material in a high vacuum environment, wherein the effusion cell comprises:a crucible containing a source of material selected from the elements in 11b to 1Va of the periodic table with said crucible having an open end juxtaposed in relatively close proximity to said semiconductor substrate upon which the epitaxial layers are to be grown, and a control assembly for controlling the distribution of flux from said effusion cell, said control assembly comprising means having a plurality of exit openings spaced from said crucible including a perforated cover for said crucible, a grating having a plurality of holes located adjacent to said perforated cover, means for rotatably adjusting said perforated cover relative to said grating so as to adjust the size of said exit openings and means for heating the area surrounding said exit openings.