Optically induced charge transfer paths between defects in BaTiO3 containing rhodium
✍ Scribed by H. Kröse; E. Possenriede; R. Scharfschwerdt; T. Varnhorst; O.F. Schirmer; H. Hesse; C. Kuper
- Publisher
- Elsevier Science
- Year
- 1995
- Tongue
- English
- Weight
- 344 KB
- Volume
- 4
- Category
- Article
- ISSN
- 0925-3467
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✦ Synopsis
An optical method is presented which allows to identify at room temperature the photoinduced charge transfers between different defects in photorefractive crystals. The analysis is based on the labelling of the optical spectra with the corresponding microscopic defect models, obtained from simultaneously recording light induced ESR and optical absorption changes at low temperatures. The investigation of as-grown BaTiO3 crystals containing Rh, using this method, shows that illumination with light of energies between 1.2 eV and 2.5 eV transfers holes from Rh 4÷ to Fe 3÷. At E > 2.5 eV holes are photoionized from Fe 4 ÷ to Rh 3 + and to an unidentified shallower hole trap.