Ferroelectric anomalous photovoltaic (APV) effect holds a great promise in the new optoelectronic application fields. Nevertheless, the limited understanding of ferroelectric APV effect mechanism hinders the exploration of new APV-active candidates. Recently, the shift current model exhibits unique insights into the bulk photovoltaic effect and has attracted considerable attention. In this work strong APV properties were presented in a high-temperature double perovskite ferroelectric, showing an extremely large above-bandgap photovoltage of ~40 V (Eg ~ 2.3eV), which is comparable to the state-of-art molecular ferroelectrics. Strikingly, the shift current model explicitly reveals the structural origin of ferroelectric APV activities and demonstrates the intrinsic correlation with Cs+ cation displacement. This pioneering work paves a pathway to develop optoelectronic smart devices.

The link to the article entitled: “Shift current anomalous photovoltaics in a double perovskite ferroelectric” can be found here.