Deprotonation-Resistant Bimolecular Passivation Strategy for 26% Efficient and Stable Inverted Perovskite Solar Cells.

IF 12.1 2区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Small Pub Date : 2025-09-30 DOI:10.1002/smll.202505684

Xiling Wu,Congcong Tian,Jingyu Cai,Beilin Ouyang,Anxin Sun,Jiajun Du,Jinling Chen,Ziyi Li,Rongshan Zhuang,Tiantian Cen,Kaibo Zhao,Qianwen Chen,Yuyang Zhao,Ran Li,Teng Xue,Chun-Chao Chen

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Abstract

Surface passivation has significantly increased the power conversion efficiency (PCE) of perovskite solar cells (PSCs). However, the most advanced methods of surface passivation depend on ammonium ligands that can lose protons under light and heat. Here, a dual-molecule approach for surface passivation is presented by combining 4-methylpyridine-3-sulfonic acid (MPSA) with ethanolamine hydrochloride (EOACl). The sulfonic acid group of MPSA provides additional protons and thus prevents the loss of protons from ammonium cations. This method reduces the deprotonation equilibrium constant of the ligands by more than 10-fold. At the same time, EOA⁺, with its strong molecular dipole (6.72 D) and high adsorption energy (ΔE = -2.68 eV), exhibits excellent field effect and chemical passivation. The enhanced perovskite solar cells achieved a PCE of 26.04%, with the encapsulated devices retaining 91.2% of their original PCE after 1100 h of MPPT operation. After 800 h of thermal aging in a dark, inert atmosphere at 85 °C, the efficiency also remained at 90.3%, showing much improved stability for practical applications.

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26%高效稳定倒置钙钛矿太阳能电池的抗去质子双分子钝化策略。

表面钝化处理显著提高了钙钛矿太阳能电池的功率转换效率（PCE）。然而，最先进的表面钝化方法依赖于铵配体，它可以在光和热下失去质子。本文提出了4-甲基吡啶-3-磺酸（MPSA）与盐酸乙醇胺（EOACl）结合的双分子表面钝化方法。MPSA的磺酸基团提供了额外的质子，从而防止了铵离子的质子损失。该方法使配体的去质子平衡常数降低了10倍以上。同时，EOA⁺具有强分子偶极子（6.72 D）和高吸附能（ΔE = -2.68 eV），表现出优异的场效应和化学钝化效果。增强钙钛矿太阳能电池的PCE为26.04%，封装后的器件在1100 h的MPPT操作后，PCE保持在原来的91.2%。在85°C的黑暗惰性气氛中热时效800 h后，效率仍保持在90.3%，在实际应用中表现出大大提高的稳定性。

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

Small 工程技术-材料科学：综合

CiteScore

17.70

自引率

3.80%

发文量

1830

审稿时长

2.1 months

期刊介绍： Small serves as an exceptional platform for both experimental and theoretical studies in fundamental and applied interdisciplinary research at the nano- and microscale. The journal offers a compelling mix of peer-reviewed Research Articles, Reviews, Perspectives, and Comments. With a remarkable 2022 Journal Impact Factor of 13.3 (Journal Citation Reports from Clarivate Analytics, 2023), Small remains among the top multidisciplinary journals, covering a wide range of topics at the interface of materials science, chemistry, physics, engineering, medicine, and biology. Small's readership includes biochemists, biologists, biomedical scientists, chemists, engineers, information technologists, materials scientists, physicists, and theoreticians alike.