材料科学
同种类的
钙钛矿(结构)
无定形固体
相(物质)
化学工程
结晶学
热力学
有机化学
化学
物理
工程类
作者
Bo Li,Yang Liu,Weihua Pu,Yawen Li,Hui Juan Yue,Meng Zhang,Jianjun Tian
标识
DOI:10.1002/adfm.202400467
摘要
Abstract Pure‐phase α‐formamidinium lead iodide (α‐FAPbI 3 ) perovskite solar cells (PSCs) possess potential high efficiency because of suitable bandgap. However, achieving high‐quality α‐FAPbI 3 films during the spin‐coating process is challenging without anti‐solvent extraction, due to the spontaneous formation of the more stable δ‐FAPbI 3 phase and the complexity of multi‐component perovskite precursor solutions. Here a gel precursor with an amorphous structure to eliminate the need for anti‐solvent extraction in achieving the homogeneous and highly oriented pure‐phase α‐FAPbI 3 is devised films. The incorporation of N,N′‐dimethylpropyleneurea, and alkylammonium chloride results in extended iodoplumbate clusters in the perovskite precursor solution. In situ, spectroscopic analysis reveals that the emergence of the stable amorphous gel precursor during the initial solidification stage ensures a uniform solute distribution. This effectively prevents preferentially oriented growth in the crystal phase precursor, leading to a significant enhancement in film homogeneity. As a result, power conversion efficiencies of 24.17% for the PSC, and 19.3% for the module are achieved, along with superior operational stability, retaining 96.1% of their initial efficiency after 850 h at the maximum power point tracking. These demonstrate the best performance for the reported pure‐phase α‐FAPbI 3 PSCs without anti‐solvent extraction, showing great promise for scalable manufacture.
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