Abstract
Perovskite solar cell (PvSCs) has attracted great interest in the photovoltaics community due to their high efficiency, low fabrication cost, and ability to be made flexible. In this present work, we have shown high-efficiency PvSCs using poly[bis(4-phenyl) (2,4,6-trimethylphenyl)amine (PTAA) as the hole-transport material and Ag back electrode. The PTAA hole transporting layer plays a crucial role in improving the interface between the RbCsMAFA perovskite absorbing layer and the Ag back electrode, thereby enhancing the power conversion efficiency (PCE) and stability of the device. We also showed the impact of PTAA's doping concentration on the solar cell performance, with the best PCE of 10.42%. This study indicates that Ag electrodes can be used as a low-cost alternative to gold to fabricate high-efficiency mixed halide quadruple cation RbCsMAFA PvSCs, thus broadening potential future applications. Importantly, our devices can keep 75% of the initial power conversion efficiency after 200 h of storage in ambient air.
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