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

• DOI: 10.1126/sciadv.adg0087
• Publication Date: 2023-05-26T17:58:21Z
• Authors: Cheng Liu; Xiuhong Sun; Yi Yang; Olga A. Syzgantseva; Maria A. Syzgantseva; Bin Ding; Naoyuki Shibayama; Hiroyuki Kanda; Farzaneh Fadaei T...; Rosario Scopelliti; Shunlin Zhang; Keith G. Brooks; Songyuan Dai; Guanglei Cui; Michael D. Irwin; Zhipeng Shao; Yong Ding; Zhaofu Fei; Paul J. Dyson; Mohammad Khaja Na...
• Keywords: Tandem

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