Surface and interface recombination in thin film HgCdTe photoconductors
作者:
Ronald D. Graft,
Frederick F. Carlson,
John H. Dinan,
Phillip R. Boyd,
Randolph E. Longshore,
期刊:
Journal of Vacuum Science&Technology A: Vacuum, Surfaces, and Films
(AIP Available online 1983)
卷期:
Volume 1,
issue 3
页码: 1696-1699
ISSN:0734-2101
年代: 1983
DOI:10.1116/1.572260
出版商: American Vacuum Society
关键词: thin films;surface properties;interface phenomena;recombination;photoconductivity;films;crystal growth;charge carriers;liquid phase epitaxy;photodetectors;recrystallization;cadmium tellurides;mercury tellurides
数据来源: AIP
摘要:
A method is described for the separation of bulk and surface recombination parameters using experimentally measured photoconductive decay curves. Curve fitting procedures using numerical solutions to the time dependent hole continuity equation permit a unique determination of surface recombination velocities and bulk lifetime. The method is applied to thick and thin films of HgCdTe to determine recombination velocities at several technologically important interfaces. Values of recombination velocity ranged from 300 to 20 000 cm/s depending upon material growth method and surface preparation. Experimentally observed deviations from the assumed model are discussed in terms of a spatially dependent bulk lifetime.
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