Phase transition-driven modulation of ferroelectricity and the photovoltaic effect in sol–gel-derived BiFeO3-based films

Ferroelectric polarization and photovoltaic effect: test model and experimental results. ( P max = 137.1 μC cm −2 , P r = 135.8 μC cm −2 , J SC = −0.12 mA cm −2 , and V OC = 63.9 mV).