Ferroelectric photovoltaic properties in doubly substituted (Bi0.9La0.1)(Fe0.97Ta0.03) O3 thin films

Doubly substituted [Bi0.9La0.1][Fe0.97Ta0.03] O-3 (BLFTO) films were fabricated on Pt/TiO2/SiO2/Si substrates by pulsed laser deposition. The ferroelectric photovoltaic properties of ZnO:Al/BLFTO/Pt thin film capacitor structures were evaluated under white light illumination. The open circuit voltage and short circuit current density were observed to be similar to 0.20V and similar to 1.35 mA/cm(2), respectively. The band gap of the films was determined to be similar to 2.66 eV, slightly less than that of pure BiFeO3 (2.67 eV). The PV properties of BLFTO thin films were also studied for various pairs of planar electrodes in different directions in polycrystalline thin films. (C) 2015 AIP Publishing LLC.