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Large Persistent Photochromic Effect Due to DX Centers in AlSb Doped with Selenium

Published online by Cambridge University Press:  26 February 2011

P. Becla ,
A. G. Witt ,
J. Lagowski  and
W. Walukiewicz
P. Becla
Affiliation:
Massachusetts Institute of Technology, Department of Materials Science, Cambridge, MA 02139
A. G. Witt
Affiliation:
Massachusetts Institute of Technology, Department of Materials Science, Cambridge, MA 02139
J. Lagowski
Affiliation:
University of South Florida, Center for Microelectronics Research, Tampa, FL 33620
W. Walukiewicz
Affiliation:
Lawrence Berkeley Laboratory, Materials Sciences Division, Berkeley, CA 94720
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Abstract

A large photochromic effect has been observed in bulk AlSb crystals doped with Se. Illumination with the light of energy higher than 1 eV leads to an increase of the absorption coefficient in the spectral range 0.1 eV to 1.6 eV. The enhanced absorption is persistent at the temperatures below about 100 K. The effect is a manifestation of a DX-like bistability of Se donors. The illumination transfers the electrons from the DX center to a metastable hydrogenic level. The increased absorption with peaks around 0.2 eV and 0.5 eV is due to photoionization from the donor level to X1 and X3 minima of the conduction band

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 378: Symposium B – Defect and Impurity-Engineered Semiconductors and Devices , 1995 , 47
Copyright
Copyright © Materials Research Society 1995

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