Enhanced Adjustable Photovoltaic Response in Multilayer BiFeO3 Films

In this paper, the photovoltaic effect of BiFeO3 (BFO) film prepared by spin-coating was investigated. The photovoltaic effect of the multilayer BFO film is significantly enhanced compared to the single layer BFO film. The short-circuit current density increases to 62.6 μA/cm2 while the open-circuit voltage is 0.29 V, which is due to the efficient transport of carriers by the electron transport layer and the hole transport layer in the multilayer film structure. In addition, it is also possible to control the photovoltaic effect of BFO film by applying an external electric field, and a possible mechanism model is proposed to explain this phenomenon. This work found a simple way to enhance the photovoltaic effect of BFO and also achieved precise control of the BFO film photovoltaic effect.