Room temperature slot-die coated perovskite layer modified with sulfonyl-γ-AApeptide for high performance perovskite solar devices

Abate, Seid Yimer; Yang, Ziqi; Jha, Surabhi; Ma, Guorong; Ouyang, Zhongliang; Zhang, Haixin; Muhammad, Shafi; Pradhan, Nihar; Gu, Xiaodan; Patton, Derek; Wang, Kun; Li, Dawen; Cai, Jianfeng; Dai, Qilin

doi:10.1016/j.cej.2022.141199

We present a design strategy for fabricating ultrastable phase-pure films of formamidinium lead iodide (FAPbI₃) by lattice templating using specific two-dimensional (2D) perovskites with FA as the cage cation. When a pure FAPbI₃precursor solution is brought in contact with the 2D perovskite, the black phase forms preferentially at 100°C, much lower than the standard FAPbI₃annealing temperature of 150°C. X-ray diffraction and optical spectroscopy suggest that the resulting FAPbI₃film compresses slightly to acquire the (011) interplanar distances of the 2D perovskite seed. The 2D-templated bulk FAPbI₃films exhibited an efficiency of 24.1% in a p-i-n architecture with 0.5–square centimeter active area and an exceptional durability, retaining 97% of their initial efficiency after 1000 hours under 85°C and maximum power point tracking.

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