Retarding solid-state reactions enable efficient and stable all-inorganic perovskite solar cells and modules

作者：Liu, Cheng; Sun, Xiuhong; Yang, Yi; Syzgantseva, Olga A.; Syzgantseva, Maria A.; Ding, Bin; Shibayama, Naoyuki; Kanda, Hiroyuki; Tirani, Farzaneh Fadaei; Scopelliti, Rosario; Zhang, Shunlin; Brooks, Keith G.; Dai, Songyuan; Cui, Guanglei; Irwin, Michael D.; Shao, Zhipeng^*; Ding, Yong^*; Fei, Zhaofu^*; Dyson, Paul J.^*; Nazeeruddin, Mohammad Khaja^*

来源：Science Advances, 2023, 9(21): eadg0087.

DOI：10.1126/sciadv.adg0087

• HALIDE PEROVSKITES
• CRYSTAL
• SALT

All-inorganic CsPbI3 perovskite solar cells (PSCs) with efficiencies exceeding 20% are ideal candidates for appli-cation in large-scale tandem solar cells. However, there are still two major obstacles hindering their scale-up: (i) the inhomogeneous solid-state synthesis process and (ii) the inferior stability of the photoactive CsPbI3 black phase. Here, we have used a thermally stable ionic liquid, bis(triphenylphosphine)iminium bis(trifluoromethyl-sulfonyl)imide ([PPN][TFSI]), to retard the high-temperature solid-state reaction between Cs4PbI6 and DMAPbI3 [dimethylammonium (DMA)], which enables the preparation of high-quality and large-area CsPbI3 films in the air. Because of the strong Pb-O contacts, [PPN][TFSI] increases the formation energy of superficial vacancies and prevents the undesired phase degradation of CsPbI3. The resulting PSCs attained a power conversion efficiency (PCE) of 20.64% (certified 19.69%) with long-term operational stability over 1000 hours. A record efficiency of 16.89% for an all-inorganic perovskite solar module was achieved, with an active area of 28.17 cm2.

• 单位
  y; 贵州大学; 中国科学院青岛生物能源与过程研究所; 北京化工大学