Effect of purple light on the ferroelectric and transport properties of epitaxial Mn-doped BiFeO3 film

An epitaxial SrRuO3 (SRO)/BiFe0.95Mn0.05O3 (BFMO)/SRO heterostructure is fabricated on (001)‐SrTiO3 (STO) substrate, in which the SRO film is prepared by magnetron sputtering and the BFMO film is deposited by a sol–gel method. The effect of purple‐light irradiation on the SRO/BFMO/SRO capacitor is studied. It is found that the leakage current density of the SRO/BFMO/SRO capacitor, measured at 5 V, increases from 0.013 A/cm2 in the dark to 0.043 A/cm2 in the light. The change of the hysteresis loop of the capacitor upon irradiation can be interpreted by the trapping of photoinduced charges to incur the reorientation of domain and the increase of the leakage current density. In addition, the capacitance versus voltage (C–V) characteristic of this film is investigated and displays a typical butterfly shape. The above results indicate a potential application of BFMO film for optoelectronic devices.