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Boron–halide interactions for crystallization regulation of a 1.68 eV wide-bandgap perovskite prepared via a two-step method
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DOI：10.1039/D5EE03984C.png)
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Abstract
En 中文
An all-solution two-step method for preparing wide-bandgap perovskites has the advantages of low cost; good repeatability and scalability. However; achieving high-quality wide-bandgap perovskite films via an all-solution two-step method remains challenging due to uneven distribution of halogens and incomplete reactions between organic salts and inorganic salts. Herein; we introduced tris(pentafluorophenyl)borane (BCF) into an inorganic layer resulting in boron–halide bonding; which stabilized uniform halide distribution and regulated the porous structure of the lead halide films; facilitating the diffusion of organic salts. Additionally; the fluorine substituents formed hydrogen bonds with organic cations; making BCF a bifunctional additive that delayed the reaction between the organic ammonium salt and the inorganic precursor; which was conducive to the growth of large-grained perovskite crystals. During the perovskite crystallization process; BCF molecules migrated to grain boundaries and the film surface; achieving a highly positive regulation influence on the nanoscale morphology and structure of the perovskite absorber films; thus leading to a pinhole-free; stress-free and less defect perovskite films. Ultimately; the approach enabled single-junction 1.68 eV wide-bandgap perovskite solar cells with a champion efficiency of 23.49% (certified 22.73%) and a VOC of 1.291 V. Furthermore; the optimized perovskite films were pioneeringly and successfully integrated into monolithic perovskite/silicon tandem solar cells on textured silicon and achieved an efficiency of 31.12%; which is the highest value among tandem solar cells prepared by an all-solution two-step method; retaining >90% of initial performance after 500 hours of continuous operation.
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