Supramolecular coordination homogenizes multi-cation wide-band-gap perovskites for high-voltage all-perovskite tandem solar cells

IF 37.1 1区材料科学 Q1 CHEMISTRY, PHYSICAL

Joule Pub Date : 2026-08-14 DOI:10.1016/j.joule.2026.102637

Tingfeng Lei,Chengda Ge,Yiting Jiang,Yidan An,Lingyi Ke,Quanrun Qiu,Wei Yang,Zhihong Wang,Zaiwei Wang,Hin-Lap Yip

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Abstract

Efficient and stable wide-band-gap (WBG) perovskites are pivotal for advancing tandem photovoltaic efficiency beyond the thermodynamic limits of single-junction cells. However, the development of these materials, particularly in multi-cation (e.g., formamidinium [FA]/methylammonium [MA]/cesium [Cs]) mixed-halide compositions, is severely hampered by light-induced phase segregation and large open-circuit voltage deficits. This instability originates from compositional heterogeneity established during film crystallization, leading to localized band-gap variations and detrimental carrier recombination pathways. Here, we report a molecular-complex doping strategy that achieves spatially homogeneous elemental distribution in 1.78 eV FA0.8MA0.1Cs0.1(I0.6Br0.4)3 perovskite films. Consequently, we fabricate a WBG perovskite solar cell that delivers a Voc exceeding 1.38 V (surpassing 90% of its thermodynamic limit) and a power conversion efficiency of over 20.5%, with a fill factor above 83%. Integrating this optimized subcell with a narrow-band-gap perovskite, we demonstrate a monolithic all-perovskite tandem solar cell achieving a power conversion efficiency of 30.4% (certified at 29.7%).

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用于高压全钙钛矿串联太阳能电池的多阳离子宽带隙钙钛矿的超分子配位均质化

高效和稳定的宽带隙钙钛矿是提高串联光伏效率的关键，突破了单结电池的热力学极限。然而，这些材料的发展，特别是在多阳离子（例如，甲酰胺[FA]/甲基铵[MA]/铯[Cs]）混合卤化物组合物中，受到光诱导相偏析和大开路电压缺陷的严重阻碍。这种不稳定性源于薄膜结晶过程中形成的成分非均质性，导致局部带隙变化和有害的载流子复合途径。本文报道了一种分子复合物掺杂策略，在1.78 eV的FA0.8MA0.1Cs0.1(I0.6Br0.4)3钙钛矿薄膜中实现了空间均匀的元素分布。因此，我们制造了一种WBG钙钛矿太阳能电池，其Voc超过1.38 V（超过其热力学极限的90%），功率转换效率超过20.5%，填充系数超过83%。将这种优化的亚电池与窄带隙钙钛矿集成，我们展示了一种单片全钙钛矿串联太阳能电池，其功率转换效率为30.4%（认证为29.7%）。

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

Joule Energy-General Energy

CiteScore

53.10

自引率

2.00%

发文量

198

期刊介绍： Joule is a sister journal to Cell that focuses on research, analysis, and ideas related to sustainable energy. It aims to address the global challenge of the need for more sustainable energy solutions. Joule is a forward-looking journal that bridges disciplines and scales of energy research. It connects researchers and analysts working on scientific, technical, economic, policy, and social challenges related to sustainable energy. The journal covers a wide range of energy research, from fundamental laboratory studies on energy conversion and storage to global-level analysis. Joule aims to highlight and amplify the implications, challenges, and opportunities of novel energy research for different groups in the field.