成核
钙钛矿(结构)
甲酰胺
结晶
材料科学
甲脒
化学工程
碘化物
溶剂
化学
无机化学
结晶学
有机化学
工程类
作者
Yao Wang,Lingcong Li,Zhujie Wu,Ruike Zhang,Jin Hee Hong,Jianxin Zhang,Huashang Rao,Zhenxiao Pan,Xinhua Zhong
标识
DOI:10.1002/anie.202302342
摘要
Perovskite film with high crystal quality is fundamental to achieving high-performance solar cells. A fast nucleation process is crucial to improving the crystallization quality. Here, we propose a self-driven prenucleation strategy to achieve fast nucleation. This is realized through rational solvent design. The key characteristics of different solvents are systematically evaluated. Among them, formamide, with ultra-high dielectric constant, low Gutman donor number, and a high boiling point, is selected as the co-solvent. These unique characteristics render formamide a double-face solvent that is a good solvent for formamidinium iodide (FAI) and CsI while a poor solvent for PbI2 . As a result, formamide induces the self-driven prenucleation of PbI2 -DMSO seeding crystals and accelerates the nucleation, improving the crystalline quality of perovskite film. The efficiency of the hole transport layer-free carbon-based perovskite solar cells is boosted beyond 19 % for the first time.
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