Abstract
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 language | English |
|---|---|
| Pages (from-to) | 3827-3833 |
| Number of pages | 7 |
| Journal | Journal of Physics Condensed Matter |
| Volume | 16 |
| Issue number | 23 |
| DOIs | |
| Publication status | Published - Jun 16 2004 |
ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics