Conductive Passivator for Efficient Monolithic Perovskite/Silicon Tandem Solar Cell on Commercially Textured Silicon

摘要

Monolithic perovskite/silicon tandem solar cells on commercially texturedsilicon with conformal perovskite top cells allow compatibility with standardindustrial processes of silicon photovoltaic, as well as maximization of lighttrapping at the least cost. However, the efficiency is still limited by unsatisfactoryopen-circuit voltage (V_(OC)) and fill factor (FF), owing to the challenge ofgrowing high-quality perovskite film on textured substrates and the lack ofparticularly effective passivation at the inferior interface between perovskiteand C_(60). Different from traditionally electricity-insulating passivator, herein,a conductive organic amine salt is introduced into this interface to suppressnonradiative recombination loss and promote carriers transfer synchronously,significantly increasing the V_(OC) while preserving high FF, thus improvingthe efficiency substantially. Finally, a champion efficiency of up to 28.51% isobtained. Furthermore, due to the favorable electrical properties of this molecule,there is a wide processing window for the passivation, which helps toachieve an efficiency of 25.13% when the active area is enlarged to 11.879 cm~2.