Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/93749
Type: Artigo de evento
Title: Phenomenological Characterization Of Photoactive Centers In Undoped Bi12tio20 Crystals Using Optical And Electrical Techniques
Author: Prejlich J.
Montenegro R.
Inocente N.R
Dos Santos P.V.
Launay J.C.
Longeaud C.
Carvalho J.F.
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. A center responsible for photochromism was identified at about 0.42eV, probably below the conduction band (CB). Two other defect centers were clearly identified at 0.17 eV and at 0.60 eV. Different centers between 1.0 and 0.85, probably above the valence band (VB), were mesured using different techniques which probably correspond to the same electron-acceptor de{reversed not sign}fect responsible for dark p-conductivity which was already reported in the literature. Classical photoconductivity experiments indicated electron-donor centers at least at about 2.2 and 2.5 eV. Holographic techniques indicated the presence of at least two photoactive centers closer than 1.6 eV from CB, one of which could be an empty one. © 2005 OSA/PEMD 2005.
Editor: Optical Society of America
Rights: fechado
Identifier DOI: 
Address: http://www.scopus.com/inward/record.url?eid=2-s2.0-84899809359&partnerID=40&md5=86158a1125624b6d99a4f12dbc1afe65
Date Issue: 2005
Appears in Collections:Unicamp - Artigos e Outros Documentos

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