The photovoltaic effect of the heterojunction based on multiferroic material BiFeO3 and organic semiconductor poly(3‐hexylthiophene) has been studied for the first time. A typical rectifying J–V characteristic of the heterojunction is observed with a rectifying ratio of ∼103. The power conversion efficiency of the device is comparable to those of hybrid solar cells based on poly(3‐hexylthiophene) and other oxide semiconductors, such as TiO2 or ZnO, indicating that BiFeO3 is a promising material for photovoltaic devices. (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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