Construction of BiFeO3/SrTiO3 p–n heterojunction for enhanced photoelectrochemical performance

Abstract

Abstract In this study, we design a hybrid BiFeO3/SrTiO3 p–n heterojunction to enhance the photoelectrochemical (PEC) performance of the sample. The experimental results reveal that the heterojunction can significantly improve the PEC performance. The optimized BiFeO3/SrTiO3 heterojunction sample shows a photocurrent density of −20.8 μA·cm−2, which is 2.9 times higher than that of the pristine BiFeO3 (−7.2 μA·cm−2). The improvement in PEC performance is attributed to the p–n heterojunction formed between BiFeO3 and SrTiO3, leading to the efficient separation and transport of carriers. Our work provides a promising route to develop the high-performance PEC system.