Solar energy conversion and utilization: Towards the emerging photo-electrochemical devices based on perovskite photovoltaics

Photo-electrochemical (PEC) devices based on perovskite photovoltaics that convert abundant solar energy directly into stored electric energy or value-added chemicals (e.g., hydrogen, carbon products) have great potential to eliminate the intermittency issue of the solar energy supply. Currently, tremendous efforts have been made to achieve boosted overall conversion efficiency of PEC devices. In this review, we highlight the state-of-the-art representative configurations of the emerging perovskite solar cells-based PEC devices including self-charging power packs and unassisted solar water splitting/CO₂ reduction based on the emerging perovskite solar cells. We also present a summary of recent progress in this field including the configuration design, integration strategies, electrode materials and their performance evaluations. Finally, the existing challenges and future perspectives are provided for the on-going research in this field.