Oxidization strategy of coordinating solvents mitigates composition segregation in perovskite

IF 17.1 1区材料科学 Q1 CHEMISTRY, PHYSICAL

Nano Energy Pub Date : 2025-01-25 DOI:10.1016/j.nanoen.2025.110717

Xudong Liu , Xuewei Jiao , Song Yin , Nasir Ali , Mingxuan Liu , Bingshun Xu , Shaopeng Yang , Weiguang Kong

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Abstract

The presence of halogen Schottky defects in the lattice structure of metal halide perovskites (MHPs) lowers the activation energy for ion migration. In this study, MAPbI₃ was employed as the perovskite prototype to investigate the source and inhibition mechanisms of halogen-ion-related point defects. Our findings indicate that the spatial separation of MA⁺-PbI₃^- and/or MAI-PbI₂ induced by the utilization of the pristine coordinating solvents is the main cause for the iodine Schottky defects. By introducing an oxidized coordinating solvent (o-NMP), a rapid in-situ reaction between MAI and PbI₂ can occur with the assistance of a reversible redox reaction in solution. Consequently, an enhanced power conversion efficiency (PCE) is observed, exceeding 22 % for MAPbI₃-based perovskite solar cells (PSCs) and approaching 24 % for FAMA mixed devices fabricated using a room-temperature blade coating method. Both the efficiency values under the corresponding perovskite systems are among the highest records achieved with similar processing techniques. Moreover, the PSCs exhibit improved stability against sunlight exposure, external electric fields, and moisture infiltration.

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配位溶剂的氧化策略减轻钙钛矿中的成分偏析

金属卤化物钙钛矿晶格结构中卤素肖特基缺陷的存在降低了离子迁移的活化能。本研究以MAPbI3为钙钛矿原型，研究卤素离子相关点缺陷的来源和抑制机制。我们的研究结果表明，原始配位溶剂的使用导致MA+- pbi3 -和/或MA - pbi2的空间分离是导致碘Schottky缺陷的主要原因。通过引入氧化配位溶剂（o-NMP）， MAI和PbI2可以在溶液中进行可逆的原位氧化还原反应。因此，观察到增强的功率转换效率（PCE）， mapbi3基钙钛矿太阳能电池（PSCs）超过22%，使用室温叶片涂层方法制造的FAMA混合器件接近24%。在相应的钙钛矿体系下，这两个效率值都是用类似的处理技术实现的最高记录。此外，PSCs在阳光照射、外部电场和水分渗透方面表现出更好的稳定性。

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来源期刊

Nano Energy CHEMISTRY, PHYSICAL-NANOSCIENCE & NANOTECHNOLOGY

CiteScore

30.30

自引率

7.40%

发文量

1207

审稿时长

23 days

期刊介绍： Nano Energy is a multidisciplinary, rapid-publication forum of original peer-reviewed contributions on the science and engineering of nanomaterials and nanodevices used in all forms of energy harvesting, conversion, storage, utilization and policy. Through its mixture of articles, reviews, communications, research news, and information on key developments, Nano Energy provides a comprehensive coverage of this exciting and dynamic field which joins nanoscience and nanotechnology with energy science. The journal is relevant to all those who are interested in nanomaterials solutions to the energy problem. Nano Energy publishes original experimental and theoretical research on all aspects of energy-related research which utilizes nanomaterials and nanotechnology. Manuscripts of four types are considered: review articles which inform readers of the latest research and advances in energy science; rapid communications which feature exciting research breakthroughs in the field; full-length articles which report comprehensive research developments; and news and opinions which comment on topical issues or express views on the developments in related fields.