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Role of domain walls in the abnormal photovoltaic effect in BiFeO3 nature communication-2013 ¹Ø¼ü´Ê£º ÌúËáîé ¹â·üЧӦ Ìúµç³ë ³ë±Ú abstract Recently, the anomalous photovoltaic (PV) effect in BiFeO3 (BFO) thin films, which resulted in open circuit voltages (Voc) considerably larger than the band gap of the material, has generated a revival of the entire field of photoferroelectrics. Here, via temperature-dependent PV studies, we prove that the bulk photovoltaic (BPV) effect, which has been studied in the past for many non-centrosymmetric materials, is at the origin of the anomalous PV effect in BFO films. Moreover, we show that irrespective of the measurement geometry, Voc as high as 50 V can be achieved by controlling the conductivity of domain walls (DW). We also show that photoconductivity of the DW is markedly higher than in the bulk of BFO.[ Last edited by wiseroy on 2014-1-12 at 23:00 ] |
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