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Surface treatment and protection method for cadmium zinc telluride crystals

United States Patent

February 25, 2003
View the Complete Patent at the US Patent & Trademark Office
Sandia National Laboratories - Visit the Intellectual Property Management and Licensing Website
A method for treatment of the surface of a CdZnTe (CZT) crystal that provides a native dielectric coating to reduce surface leakage currents and thereby, improve the resolution of instruments incorporating detectors using CZT crystals. A two step process is disclosed, etching the surface of a CZT crystal with a solution of the conventional bromine/methanol etch treatment, and after attachment of electrical contacts, passivating the CZT crystal surface with a solution of 10 w/o NH.sub.4 F and 10 w/o H.sub.2 O.sub.2 in water.
Wright; Gomez W. (Nashville, TN), James; Ralph B. (Livermore, CA), Burger; Arnold (Nashville, TN), Chinn; Douglas A. (Livermore, CA)
Sandia National Laboratories (Livermore, CA)
09/ 536,883
March 28, 2000
STATEMENT OF GOVERNMENT INTEREST This invention was made with Government support under contract no. DE-AC04-94AL85000 awarded by the U.S. Department of Energy to Sandia Corporation. The Government has certain rights in the invention.