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Photoluminescence study of the sol-gel derived (Ba0.5Sr 0.5) TiO3 thin films for the characterization of trap states
, M.C. Bhatnagar, G.L. Sharma, N. Karar, H. Chander
Published in
Volume: 44
Issue: 1 A
Pages: 34 - 37
Room temperature photoluminescence (PL) spectroscopy was done to investigate luminescent trap states in sol-gel deposited (Ba,Sr)TiO3 thin films. The pre-sintered films showed three distinct PL peaks. Increase in the peak intensity was observed with increase in pre-sintering temperature. These PL peaks were assigned to (a) singly charged oxygen vacancies (b) TiO 2 networks and (c) the contribution from the substrate. In contrast, the sintered samples showed only a band-edge luminescence with an intense peak near the band-gap energy. Identification of such observed trap states are important in understanding the results of dielectric measurements because they contribute to the leakage currents and loss mechanisms. ©2005 The Japan Society of Applied Physics.
About the journal
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers