An efficient and hydrophobic molecular doping in perovskite solar cells

• Published in: Nano energy 2021-04, Vol.82, p.105751, Article 105751
• Main Authors: Luo, Junsheng, Lin, Fangyan, Xia, Jianxing, Yang, Hua, Zhang, Ruilin, Malik, Haseeb Ashraf, Shu, Hongyu, Wan, Zhongquan, Han, Keli, Wang, Ruilin, Yao, Xiaojun, Jia, Chunyang
• Format: Article
• Language: English
• Subjects: High-efficiency; Hydrophobic nature; Migration barrier; Perovskite solar cells; Superior stability
• ISSN: 2211-2855
• DOI: 10.1016/j.nanoen.2021.105751

Longevity has been a long-standing challenge for perovskite photovoltaics. In general, Li-TFSI/t-BP are the state-of-the-art bi-dopants for the hole-transporting layer (HTL) in perovskite solar cells (PSCs), although such dopants significantly diminish the stability of devices. Here, we reported a novel dopant of fluorinated iron(III) porphine (Fe(III)-PP) as a potential alternative to the Li-TFSI/t-BP. The optimized PSCs exhibit a champion power conversion efficiency (PCE) of 21.73%, which outperforms the standard bi-dopants Li-TFSI/t-BP (21.07%). The high migration barrier together with the hydrophobic nature of the Fe(III)-PP, which in turn suppress intrinsic ion migration and alleviate extrinsic moisture-induced degradation, resulting in prominent improvement of long-term stability of PSCs up to 1200 h under air exposure without encapsulation. [Display omitted] •A novel dopant fluorinated iron(III) porphine (Fe(III)-PP) has been developed for PTAA in PSCs.•Fe(III)-PP has excellent doping performance, high migration barrier and hydrophobic nature.•PSCs based on Fe(III)-PP doped PTAA show a champion efficiency as high as 21.73%.•PSCs exhibit superior long-term stability up to 1200 h under air exposure without encapsulation.