Journal
THIN SOLID FILMS
Volume 520, Issue 10, Pages 3843-3846Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.tsf.2011.06.087
Keywords
Photoluminescence; Strontium titanate; Polaron; Oxide semiconductors
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Funding
- MEXT, Japan [20104006]
- Sumitomo Electric Industries Group CSR Foundation
- Grants-in-Aid for Scientific Research [20104006] Funding Source: KAKEN
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We studied the band-edge photoluminescence (PL) of electron-doped SrTiO3 and strongly photoexcited SrTiO3 crystals. Two band-edge PL peaks are clearly observed at low temperatures. The PL peak energies coincide with the high- and low-temperature onsets of the optical absorption, corresponding to the phonon-assisted band-to-band optical transition. This result is the direct evidence that the free electrons and holes exist in the conduction and valence bands, and radiative recombination of free electrons and free holes causes the band-edge PL. (C) 2011 Elsevier B.V. All rights reserved.
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