A unified ligand-dimensional design to halt cation migration in perovskite photovoltaics

IF 13.9 1区综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES

Science Advances Pub Date : 2026-07-01 DOI:10.1126/sciadv.aed6327

Zhipeng Miao, Shiheng Wang, Qi Pan, Jie Yu, Yapeng Shi, Yunhang Xie, Yipei Wang, Sihui Peng, Ting Zhang, Hong Lu, Hainam Do, Yiqiang Zhang, Yanlin Song, Pengwei Li

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Abstract

Organic cation migration, particularly that of formamidinium (FA⁺), remains a major factor limiting the long-term stability of perovskite solar cells (PSCs). Low-dimensional/three-dimensional (LD/3D) heterojunctions have shown promise for mitigating this migration, yet systematic comparisons under a unified processing and scaffold framework are lacking. Here, we develop a family of pyridine-based ligands that enable the formation of structurally well-defined LD/3D heterojunctions spanning perovskite-related 2D, 1D, 1D intercalated, and 0D metal-halide motif architectures under identical processing. This platform reveals that the 2D/3D configuration uniquely couples geometric confinement with multidirectional hydrogen bonding to immobilize FA⁺ and enhance carrier performance. Consequently, PSCs achieve a champion efficiency of 26.88% (certified 26.52%) and outstanding stability, retaining >91% initial efficiency after 1000 hours at 85°C/85% relative humidity and >94% after 2000 hours of maximum power point tracking. Large-area modules (900 square centimeters) deliver 20.25% efficiency (certified 17.75%) with negligible degradation over 4 months. This work establishes a ligand-based dimensional design platform for stable, scalable perovskite photovoltaics.

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一个统一的配体尺寸设计，以阻止钙钛矿光伏电池中的阳离子迁移

有机阳离子迁移，特别是甲脒（FA +）的迁移，仍然是限制钙钛矿太阳能电池（PSCs）长期稳定性的主要因素。低维/三维（LD/3D）异质结显示出减轻这种迁移的希望，但缺乏统一处理和支架框架下的系统比较。在这里，我们开发了一个基于吡啶的配体家族，能够在相同的处理下形成结构明确的LD/3D异质结，跨越钙钛矿相关的2D， 1D， 1D插层和0D金属卤化物基序结构。该平台表明，二维/三维结构独特地将几何约束与多向氢键耦合在一起，可以固定FA +并提高载流子性能。因此，psc实现了26.88%的冠军效率（认证26.52%）和出色的稳定性，在85°C/85%相对湿度下1000小时保持>；91%的初始效率，在2000小时最大功率点跟踪后保持>；94%。大面积模块（900平方厘米）的效率为20.25%（认证为17.75%），在4个月内的退化可以忽略不计。这项工作为稳定的、可扩展的钙钛矿光伏电池建立了一个基于配体的尺寸设计平台。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Science Advances 综合性期刊-综合性期刊

CiteScore

21.40

自引率

1.50%

发文量

1937

审稿时长

29 weeks

期刊介绍： Science Advances, an open-access journal by AAAS, publishes impactful research in diverse scientific areas. It aims for fair, fast, and expert peer review, providing freely accessible research to readers. Led by distinguished scientists, the journal supports AAAS's mission by extending Science magazine's capacity to identify and promote significant advances. Evolving digital publishing technologies play a crucial role in advancing AAAS's global mission for science communication and benefitting humankind.