Ion migration in organometal halide perovskite solar cell (OHPSC) and crystal structure evolution of organometal halide perovskites (OHPVSKs) in air are considered as one of the critical factors for unstable performance and of the urgent issues for the reliability of OHPSCs. Herein, a novel cation of acetamidinium (Aa⁺) with stronger coordinated bond with I⁻ than methylammonium is induced into OHPVSK to stabilize its crystal structure. By incorporating Aa⁺ ions into OHPVSKs, the power conversion efficiency (PCE) of OHPSC without an encapsulation can maintain higher than 75% of its initial PCE after a 200 h humidity (60–80% relative humidity (RH) in air) or a 24 h thermal stress test (85 °C in dry N₂). The Aa–MAPbI₃ device exhibits an outstanding efficiency of 20.68%, and over 80% of initial PCE is maintained after a 1300 h damp heat as encapsulated. This novel cation can be easily incorporated into OHPVSK via a hot casting process in air with a high environmental tolerance as compared with that from the conventional coating process, which suffers from sophisticated crystallization steps and a strict processing atmosphere. It extends processing windows for OHPVSK fabrication and provides a promising path toward mass production and further commercialization.

中文翻译：

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eta胺阳离子通过空气可加工方法赋予有机金属卤化物钙钛矿离子固定和结构稳定，以实现长寿命和高效p-i-n平面太阳能电池

有机金属卤化物钙钛矿太阳能电池（OHPSC）中的离子迁移和有机金属卤化物钙钛矿（OHPVSKs）在空气中的晶体结构演变被认为是性能不稳定的关键因素之一，也是OHPSC可靠性迫在眉睫的问题。这里，acetamidinium的一种新颖的阳离子（AA ⁺）与我更强配价键^-比甲基铵被引入到OHPVSK以稳定其晶体结构。通过将Aa ⁺离子掺入OHPVSK中，在200 h湿度（空气中60–80％相对湿度（RH））或200 h湿度下，没有封装的OHPSC的功率转换效率（PCE）可以维持其初始PCE的75％以上。 24小时热应力测试（在干燥N _2中为85°C ）。Aa–MAPbI ₃该器件表现出了20.68％的出色效率，并且经过1300 h的湿热封装后，可以维持80％以上的初始PCE。与具有复杂的结晶步骤和严格的加工气氛的常规涂覆方法相比，该新型阳离子可通过在环境中具有高环境耐受性的热浇铸方法容易地在空气中掺入到OHPVSK中。它扩展了用于OHPVSK制造的处理窗口，并为大规模生产和进一步商业化提供了一条有希望的途径。