High-Efficiency Perovskite Solar Cell Based on Sequential Doping of PTAA

Perovskite solar cells have been extensively studied and have recently demonstrated a power conversion efficiency above 23%. In our present approach, we select poly(triaryl amine) (PTAA) as the hole-transport material and use an inverted solar cell planar structure. We propose a sequential method to dope the PTAA thin film in order to reduce the solar cell's series resistance. A modified inter-diffusion method is adopted to improve the perovskite film. We optimize the solvent-assisted annealing condition to maximize the perovskite grain size and reduce the pin-hole density. The impact of PTAA's doping concentration on the solar cell's PV performance is investigated. Compared to conventional PEDOT:PSS-based perovskite solar cell, we observe an improvement in both the open-circuit voltage and the short-circuit current, resulting in a power conversion efficiency enhancement from 12.7% to 15.3%.

钙钛矿太阳能电池已被广泛研究，并且最近其能量转换效率已超过23%。在我们目前的方法中，我们选择聚（三芳基胺）（PTAA）作为空穴传输材料，并使用倒置太阳能电池平面结构。我们提出一种连续的方法来掺杂PTAA薄膜，以降低太阳能电池的串联电阻。采用一种改进的相互扩散方法来改善钙钛矿薄膜。我们优化溶剂辅助退火条件，以使钙钛矿晶粒尺寸最大化并降低针孔密度。研究了PTAA的掺杂浓度对太阳能电池光伏性能的影响。与传统的基于PEDOT:PSS的钙钛矿太阳能电池相比，我们观察到开路电压和短路电流均有所提高，从而使能量转换效率从12.7%提高到15.3%。