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Frequency resolved photoconductivity of bulk CdS single crystals
Author(s) -
Belal A. E.,
ElMongy A. Abd,
El Dosoky N.
Publication year - 1994
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.2170290812
Subject(s) - photoconductivity , recombination , crystal (programming language) , single crystal , materials science , chemistry , low frequency , molecular physics , condensed matter physics , analytical chemistry (journal) , optoelectronics , crystallography , physics , biochemistry , chromatography , astronomy , computer science , gene , programming language
Photoconductivity measurements in CdS single crystal showed that a.c. photoconductivity decays as ω −s , with s value ‐ {1 + α} for ω > 1/τ and ‐ {1–α} for ω < 1/τ. At low frequency values, recombination might be controlled by monomolecular behaviour. As the frequency increases bimolecular behaviour, in shallow states, dominates. Direct recombination is found to be weak dependent on both the intensity and applied voltage. However when band tail recombination is dominant (at higher frequencies), strong dependence is observed.