Photocurrents in the polar phase of K1-xLixTaO3

Authors
Camagni, P Galinetto, P Giulotto, E Samoggia, G Sangalli, P
Citation
P. Camagni et al., Photocurrents in the polar phase of K1-xLixTaO3, RADIAT EFF, 151(1-4), 1999, pp. 65-70
Citations number
7
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
RADIATION EFFECTS AND DEFECTS IN SOLIDS
ISSN journal
10420150 → ACNP
Volume
151
Issue
1-4
Year of publication
1999
Pages
65 - 70
Database
ISI
SICI code
1042-0150(1999)151:1-4<65:PITPPO>2.0.ZU;2-C
Abstract
Experiments on photoconductivity and thermally stimulated currents were per formed on Li-doped KTaO3 single crystals. The large enhancement of conducti vity, caused by UV excitation at low temperature was found to correlate wit h a subsequent release of trapped charge between 30 and 40K. No correspondi ng release was shown by pure KTaO3, consistently with a very low yield of p hotoconduction. It is concluded that the presence of hole traps, with the c onsequent quenching of electron-hole recombination, is at the origin of the photoconductive response of K1-xLixTaO3.