▎ 摘　　要

We report the switchable photovoltaic effects in graphene/BiFeO3/Pt heterostructures. Pure phase polycrystalline BiFeO3 films were deposited on Pt/TiO2/SiO2/Si substrates by pulse laser deposition. A bilayer graphene was transferred onto the BiFeO3 film which serves as transparent conducting electrodes. The heterostructures showed switchable photovoltaic effect depending on ferroelectric polarization directions indicating depolarization field induced separation of photo-generated carriers. The open circuit voltage (V-OC) and short circuit current density (J(SC)) were measured to be similar to 110 mV, similar to 92 mu A/cm(2) in positive polarity and similar values were obtained when the polarity was reversed. The J(SC) and V-OC also showed rapid response (<100 ms) as a function of light exposure time. (C) 2014 AIP Publishing LLC.