Synergistic Management of Crystallization and Defects in Tin-Lead Perovskites towards Efficient All-Perovskite Tandem Solar Cells

IF 29.1 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Advanced Materials Pub Date : 2026-04-16 DOI:10.1002/adma.73038

Jiayu You, Yi Luo, Juncheng Wang, Ruohao Wang, Zhiyu Gao, Yuliang Xu, Jialun Jin, Shenghan Wu, Wenbo Jiao, Hao Zhang, Hao Huang, Dinghao Ma, Yanqing Yao, Shining Zhang, Shun Zhou, Peng Cui, Xing Zhao, Xinxing Yin, Chuanxiao Xiao, Wen-Hua Zhang, Martin Stolterfoht, Cong Chen, Dewei Zhao

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Abstract

Low-bandgap mixed tin–lead (Sn–Pb) perovskites are promising near-infrared absorbers for all-perovskite tandem solar cells (APTSCs), but suffer from Sn-related defects, ion migration, and poor crystallinity. Herein, we developed a synergistic dual-molecule additive strategy by incorporating aminoguanidine sulfate (AGS) and L-alanine hydrochloride (AHC) into the Sn–Pb perovskite precursor. The guanidine moieties of AGS bonded to Sn vacancies to inhibit the oxidation of Sn²⁺ and formed hydrogen bonds with formamidinium (FA⁺) to immobilize its migration. Besides, the ionic hydrogen bonds between AHC and the perovskite components slowed down the crystallization process of perovskite and inhibited halide ion migration. Importantly, the specific interaction between AGS and AHC enabled a uniform distribution of the additives and provided efficient defect passivation at grain boundaries. This synergy regulated the film formation kinetics, promoted preferred orientation growth, and enhanced crystallinity, thereby reducing non-radiative recombination and ion migration. As a result, our Sn–Pb perovskite solar cells achieved an efficiency of up to 23.44%. Furthermore, we demonstrated a champion efficiency of 29.36% (certified 28.57%) for APTSCs.

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高效全钙钛矿串联太阳能电池中锡铅钙钛矿结晶和缺陷的协同管理

低带隙混合锡铅钙钛矿（Sn-Pb）钙钛矿是全钙钛矿串联太阳能电池（aptsc）中很有前途的近红外吸收剂，但存在sn相关缺陷、离子迁移和结晶度差的问题。在此，我们开发了一种协同双分子添加剂策略，将氨基胍硫酸盐（AGS）和l-丙氨酸盐酸盐（AHC）加入到Sn-Pb钙钛矿前驱体中。AGS的胍基部分与Sn空位结合，抑制Sn2+的氧化，并与甲脒（FA+）形成氢键，固定其迁移。AHC与钙钛矿组分之间的离子氢键减缓了钙钛矿的结晶过程，抑制了卤化物离子的迁移。重要的是，AGS和AHC之间的特定相互作用使添加剂的分布均匀，并在晶界处提供有效的缺陷钝化。这种协同作用调节了薄膜形成动力学，促进了择优取向生长，增强了结晶度，从而减少了非辐射复合和离子迁移。因此，我们的Sn-Pb钙钛矿太阳能电池的效率高达23.44%。此外，我们证明了aptsc的冠军效率为29.36%（认证为28.57%）。

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来源期刊

Advanced Materials 工程技术-材料科学：综合

CiteScore

43.00

自引率

4.10%

发文量

2182

审稿时长

2 months

期刊介绍： Advanced Materials, one of the world's most prestigious journals and the foundation of the Advanced portfolio, is the home of choice for best-in-class materials science for more than 30 years. Following this fast-growing and interdisciplinary field, we are considering and publishing the most important discoveries on any and all materials from materials scientists, chemists, physicists, engineers as well as health and life scientists and bringing you the latest results and trends in modern materials-related research every week.