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Doping-assisted defect control in compound semiconductors

United States Patent

July 11, 2006
View the Complete Patent at the US Patent & Trademark Office
Lawrence Berkeley National Laboratory - Visit the Technology Transfer and Intellectual Property Management Department Website
The present invention relates to the production of thin film epilayers of III V and other compounds with acceptor doping wherein the acceptor thermally stabilizes the epilayer, stabilize the naturally incorporated native defect population and therewith maintain the epilayer's beneficial properties upon annealing among other advantageous effects. In particular, balanced doping in which the acceptor concentration is similar to (but does not exceed) the antisite defects in the as-grown material is shown to be particularly advantageous in providing thermal stability, high resistivity and ultrashort trapping times. In particular, MBE growth of LT-GaAs epilayers with balanced Be doping is described in detail. The growth conditions greatly enhance the materials reproducibility (that is, the yield in processed devices). Such growth techniques can be transferred to other III V materials if the growth conditions are accurately reproduced. Materials produced herein also demonstrate advantages in reproducibility, reliability and radiation hardening.
Specht; Petra (Piedmont, CA), Weber; Eicke R. (Oakland, CA), Weatherford; Todd Russell (Prunedale, CA)
The Regents of the University of California (Oakland, CA), The United States of America as represented by the Secretary of the Navy (Washington, DC)
10/ 706,610
November 12, 2003
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT This invention was made with Government support under Contract (Grant) No. F49620-98-1-0135 of the Air Force Office of Scientific Research, Contract (Grant) No. F49620-95-1-0091 of the Joint Services Electronics Program. Facilities were used at the Center for Advanced Materials at the Lawrence Berkeley National Laboratories, supported by the U.S. Department of Energy under Contract (Grant) No. DE-AC03-76SF00098. The Government has certain rights to this invention.