IMF2017

Recently, photovoltaic effect in ferroelerctrics have been attracted much attention because of its high voltage generation. We have investigated bulk photovoltaic effect in single-domain BiFeO₃ (BFO) thin films, and have reported that Pt/single-domain BFO/Pt coplanar capacitor with a interelectrodes distance of 260 μm shows open circuit voltage (V_OC) of 41 V under a blue-violet laser (λ= 405 nm) illumination. In this study, enhancement of bulk photovoltaic effect in single-domain BFO thin films by Mn doping was investigated. 1-μm-thick Mn-doped BFO (BFMO) thin films with various Mn-doping amount of 0 – 10 at% were grown by RF magnetron sputtering. Vicinal SrTiO₃ (STO) (001) with vicinal direction and angle of <110> and 4^o, respectively, was used as a substrate for growing single-domain BFMO thin films. Pt electrodes were deposited on BFMO thin films, and Pt/BFMO/Pt coplanar capacitors with interelectrodes distance of 260 μm were prepared. I-V characteristics of the Pt/BFMO/Pt coplanar capacitors were measured under blue-violet laser illumination. Maximum V_OC of 287 V was found in Pt/1-at%-doped BFO/Pt coplanar capacitor at RT. This value corresponds to electric field of 11 kV/cm.