Steady-state photoconductivity in amorphous selenium glasses

N. Qamhieh, M. L. Benkhedir, M. Brinza, J. Willekens, G. J. Adriaenssens

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)


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 ± 0.06 and 1.35 ± 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.

Original languageEnglish
Pages (from-to)3827-3833
Number of pages7
JournalJournal of Physics Condensed Matter
Issue number23
Publication statusPublished - Jun 16 2004

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics


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