Deep chalcogen donors and electron localization in aluminum nitride
Journal Article
·
· Journal of Physics. Condensed Matter
- Naval Research Lab. (NRL), Washington, DC (United States)
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
We show with hybrid density functional theory calculations that chalcogen donors other than oxygen (i.e. SN , SeN , and TeN ) give rise to deep donor states in aluminum nitride. These donors trap a localized electron in their neutral charge state, leading to deep (+/0 ) donor levels that are 0.45 eV or more from the conduction-band edge. As such, this behavior is distinct from the DX behavior leads to deep (+/−) levels which affects other donors such as ON and SiAl . We highlight how these results hint at the formation of small electron polarons in AlN, which are found to be unstable in the bulk, but metastable when bound to donor dopants like SiAl and the chalocogens, with activation energies on the order of 0.2–0.3 eV. These results indicate that S, Se, and Te are not shallow donor dopants in aluminum nitride and identify origins of the experimentally observed ∼200–300 meV activation energies for dopant activation in donor-doped samples.
- Research Organization:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE; USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE National Nuclear Security Administration (NNSA)
- Grant/Contract Number:
- AC52-07NA27344
- OSTI ID:
- 2560943
- Alternate ID(s):
- OSTI ID: 2553105
OSTI ID: 2571721
- Report Number(s):
- LLNL--JRNL-872326
- Journal Information:
- Journal of Physics. Condensed Matter, Journal Name: Journal of Physics. Condensed Matter Journal Issue: 20 Vol. 37; ISSN 0953-8984; ISSN 1361-648X
- Publisher:
- IOP PublishingCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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