High‐Efficiency Wide‐Bandgap Perovskite Solar Cells for Laser Energy Transfer Underwater

Wide‐bandgap perovskite solar cells (PSCs) are a promising technology with a series of potential applications, including tandem photovoltaics, solar‐driven electrochemical energetic devices, and outfit morphing power supply for underwater equipment. However, the energy‐level difference between the charge transport layer and perovskite may result in inefficient interfacial charge extraction, leading to the series carrier accumulation at the interface that impairs the photovoltaic performance. Herein, [6,6]‐phenyl C 61 butyric acid methyl ester is introduced between SnO 2 and FAPbBr 3 to alleviate the energy‐level mismatch. Significant photoluminescence quenches and decreased series resistance both verify the promoted interfacial charge extraction efficiency. Besides, the film on the flattened nonwetting electronic transport layers film has better quality, thus reducing defect density and nonradiative recombination. As a result, a 20% power conversion efficiency (PCE) improvement, from 7.02% to 8.55%, is achieved under AM1.5G illumination. More importantly, for the first time, this work demonstrates a highly efficient PSC with a PCE over 43% under the 532 nm laser condition, providing a promising wireless fast charging way with high‐power laser irradiation in deep ocean.