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Engineering a Surface Reconstruction Cascade via Synergistic Halide Management for High-performance Perovskite Photovoltaics
One-line summary
A solar energy research paper on Engineering a Surface Reconstruction Cascade via Synergistic Halide Management for High-performance Perovskite Photovoltaics.
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Chinese explanation / 中文解读
中文解读待补充：本站会优先为光伏效率、钙钛矿太阳能电池、储能技术、太阳能热利用、BIPV、并网技术等高价值论文补充中文说明。
Original abstract
The efficiency and stability of perovskite solar cells (PSCs) are limited by surface defect-induced non-radiative recombination and ion migration. Herein, we propose a cascading-cooperative reconstruction strategy based on synergistic post-treatment with methylammonium chloride (MACl) and phenethylammonium iodide (PEAI), which forms a uniform passivation layer on perovskite films via a two-step solution process. Unlike conventional single-step passivation, MACl treatment induces a dissolution-recrystallization process to enlarge grain size, while subsequent PEAI treatment further passivates grain boundary defects through ion exchange and amine coordination. The synergistic post-treatment reduces the surface trap density of perovskite to 1/3 of the control sample, with an increase of the open-circuit voltage (<em>V</em><sub>OC</sub>) to 1.15 V, and a champion power conversion efficiency (<em>PCE</em>) of 23.24%. Besides, the device retains over 90% of its initial <em>PCE</em> after 720 hours. This strategy, by elucidating the mechanism of constructing robust interfaces through cascading passivation, provides a new design principle for fabricating highly stable inverted PSCs.
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