Steady-state photoconductivity in amorphous selenium glasses

Steady-state photoconductivity measurements are carried out for bulk and thin-film amorphous selenium (a-Se) samples in the temperature range between 190 and 340 K. The temperature and light-intensity dependences of the photoconductivity reveal the presence of both mono- and bimolecular recombinatio...

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Bibliographic Details
Published in:Journal of physics. Condensed matter 2004-06, Vol.16 (23), p.3827-3833
Main Authors: Qamhieh, N, Benkhedir, M L, Brinza, M, Willekens, J, Adriaenssens, G J
Format: Article
Language:English
Subjects:
Exact sciences and technology
Physics
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Summary:Steady-state photoconductivity measurements are carried out for bulk and thin-film amorphous selenium (a-Se) samples in the temperature range between 190 and 340 K. The temperature and light-intensity dependences of the photoconductivity reveal the presence of both mono- and bimolecular recombination regimes. The current activation energies measured in the two regions point to energy levels in the gap for the recombination centres at 0.36 plus/minus 0.06 and 1.35 plus/minus 0.10 eV above the valence band mobility edge. These values put a-Se in line with the other chalcogenide semiconducting glasses that exhibit negative-U behaviour.
ISSN:0953-8984
1361-648X
DOI:10.1088/0953-8984/16/23/003