Boosting the ultra-stable unencapsulated perovskite solar cells by using montmorillonite/CH <sub/>3</sub> NH <sub/>3</sub> PbI <sub/>3</sub> nanocomposite as photoactive layer

摘要： Lead halide perovskites, such as methylammonium lead iodide (MAPbI3) can reach near 100% internal quantum e?ciency in single solar cells, but they still encounter significant thermodynamic losses in photon energy to o?set device photovoltage and performance. Herein, a novel prismatic perovskite solar cell with light trapping configuration, namely, Prim PVSC, is designed to mitigate such losses in devices, through modulating the pathway of light inside series cells, wherein incident high-to-low energy photons are separately captured by four horizontally aligned MAPbIxBr3?x subcells with varied bandgaps. This newly designed PVSC has remarkably led to a record open circuit voltage of 5.3 V in four series devices and power conversion e?ciency of 21.3%, which could provide a new way to break the performance bottleneck of perovskites. Practically, this type of device architecture could also be applied in flexible modules for large-area application.