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Type: Artigo de periódico
Title: Phenomenological characterization of photoactive centers in Bi12TiO20 crystals
Author: Frejlich, J
Montenegro, R
Inocente-Junior, NR
dos Santos, PV
Launay, JC
Longeaud, C
Carvalho, JF
Abstract: We report optical and electrical measurements contributing for a better characterization of the relevant photoactive center levels in undoped photorefractive Bi12TiO20 (BTO) crystals grown in Brazil. Comparative results for Pb-doped BTO and Bi12GaO20 are also reported. A center responsible for photochromism was identified at 0.42-0.44 eV, probably below the conduction band (CB). The main electron and hole donor center is detected at 2.2 eV from the CB and the equilibrium Fermi level is pinned at this level. Other localized centers were identified at different positions in the band gap and their relation with the behavior of BTO under different wavelengths and operating conditions is discussed with particular attention to holographic recording.
Country: EUA
Editor: Amer Inst Physics
Rights: aberto
Identifier DOI: 10.1063/1.2434009
Date Issue: 2007
Appears in Collections:Unicamp - Artigos e Outros Documentos

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