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Ionizing radiation detector

United States Patent

November 18, 2003
View the Complete Patent at the US Patent & Trademark Office
A CdZnTe (CZT) crystal provided with a native CdO dielectric coating to reduce surface leakage currents and thereby, improve the resolution of instruments incorporating detectors using CZT crystals is disclosed. A two step process is provided for forming the dielectric coating which includes etching the surface of a CZT crystal with a solution of the conventional bromine/methanol etch treatment, and 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 after attaching electrical contacts to the crystal surface.
Wright; Gomez W. (Nashville, TN), James; Ralph B. (Livermore, CA), Burger; Arnold (Nashville, TN), Chinn; Douglas A. (Livermore, CA)
Sandia National Laboratories (Livermore, CA)
10/ 325,995
December 19, 2002
STATEMENT OF GOVERNMENT INTEREST This invention was made with Government support under government contract no. DE-ACO04-94AL85000 awarded by the U.S. Department of Energy to Sandia Corporation. The Government has certain rights in the invention, including a paid-up license and the right, in limited circumstances, to require the owner of any patent issuing in this invention to license others on reasonable terms.