High-quality PEDOT:PSS layer plays an important role in achieving efficient FASnI₃ perovskite solar cells. To overcome the defects of the conventional PEDOT:PSS layer, edetate disodium (EDTA-2Na) was applied as the dopant into the PEDOT:PSS solution to modify the film quality. By characterizing the surface morphology and the analysis of the bulk crystallization, it reveals that the incorporation of EDTA-2Na can efficiently optimize the surface morphology, surface energy state and the grain size of the perovskite crystals. Therefore the open-circuit voltage of the perovskite devices can be improved, which as a result leads to the enhancement of the overall device performance as long as the doping concentration of EDTA-2Na was optimized.

高质量的 PEDOT:PSS 层在实现高效 FASnI ₃钙钛矿太阳能电池方面发挥着重要作用。为了克服传统 PEDOT:PSS 层的缺陷，将依地酸二钠 (EDTA-2Na) 作为掺杂剂加入到 PEDOT:PSS 溶液中以改善薄膜质量。通过表征表面形貌和对本体结晶的分析，表明EDTA-2Na的掺入可以有效地优化钙钛矿晶体的表面形貌、表面能态和晶粒尺寸。因此，只要优化 EDTA-2Na 的掺杂浓度，就可以提高钙钛矿器件的开路电压，从而提高整体器件性能。