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Title: Surface treatment and protection method for cadmium zinc telluride crystals

Abstract

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.

Inventors:
 [1];  [2];  [1];  [2]
  1. Nashville, TN
  2. Livermore, CA
Issue Date:
Research Org.:
Sandia National Laboratories (SNL), Albuquerque, NM, and Livermore, CA (United States)
OSTI Identifier:
875075
Patent Number(s):
6524966
Assignee:
Sandia National Laboratories (Livermore, CA)
DOE Contract Number:  
AC04-94AL85000
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
surface; treatment; protection; method; cadmium; zinc; telluride; crystals; cdznte; czt; crystal; provides; native; dielectric; coating; reduce; leakage; currents; improve; resolution; instruments; incorporating; detectors; step; process; disclosed; etching; solution; conventional; brominemethanol; etch; attachment; electrical; contacts; passivating; 10; nhsub4; hsub2; osub2; water; electrical contact; surface treatment; cadmium zinc; zinc telluride; reduce surface; /438/

Citation Formats

Wright, Gomez W, James, Ralph B, Burger, Arnold, and Chinn, Douglas A. Surface treatment and protection method for cadmium zinc telluride crystals. United States: N. p., 2003. Web.
Wright, Gomez W, James, Ralph B, Burger, Arnold, & Chinn, Douglas A. Surface treatment and protection method for cadmium zinc telluride crystals. United States.
Wright, Gomez W, James, Ralph B, Burger, Arnold, and Chinn, Douglas A. Wed . "Surface treatment and protection method for cadmium zinc telluride crystals". United States. https://www.osti.gov/servlets/purl/875075.
@article{osti_875075,
title = {Surface treatment and protection method for cadmium zinc telluride crystals},
author = {Wright, Gomez W and James, Ralph B and Burger, Arnold and Chinn, Douglas A},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2003},
month = {1}
}

Patent:

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Works referenced in this record:

Performance of CdZnTe coplanar-grid gamma-ray detectors
journal, June 1996

  • Luke, P. N.; Eissler, E. E.
  • IEEE Transactions on Nuclear Science, Vol. 43, Issue 3
  • DOI: 10.1109/23.507088

Unipolar charge sensing with coplanar electrodes-application to semiconductor detectors
journal, January 1995

  • Luke, P. N.
  • IEEE Transactions on Nuclear Science, Vol. 42, Issue 4
  • DOI: 10.1109/23.467848

Exploratory search for improved oxidizing agents used in the reduction of surface leakage currents of CdZnTe detectors
conference, October 1999

  • Wright, Gomez W.; Chinn, Douglas; Brunett, Bruce A.
  • SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, SPIE Proceedings
  • DOI: 10.1117/12.366617