Bisphosphonate‐Embedded a π‐Conjugated Passivator Enable Efficient and Stable n‐i‐p Perovskite Solar Cells with Low‐Polarity Solvent Processing

IF 26.8 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Advanced Materials Pub Date : 2025-10-04 DOI:10.1002/adma.202513151

Xiaochun Liao, Yueli Liu, Xinyue Cao, Jie Wu, Tongqiang Liu, Pengfei Ding, Jialei Liu, Qiaoling Zuo, He Sun, Bo Qu, Lixin Xiao, Daobin Yang, Ziyi Ge

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引用次数: 0

Abstract

Interface passivators play a critical role in improving the efficiency of perovskite solar cells (PSCs). However, the conventional passivators often require processing in high‐polarity solvents that can cause additional surface defects on the perovskite film, thereby reducing the efficiency and stability of n‐i‐p PSCs. Herein, a bisphosphate molecule (named DCTP) is designed and synthesized to simultaneously address solvent compatibility, defect passivation, and hole extraction. DCTP has good solubility in low‐polarity solvents such as toluene, chlorobenzene, and chloroform without damaging the perovskite surface. The chlorobenzene‐processed DCTP interlayer can sufficiently passivate the defects on the perovskite surface and improve the energy level arrangement at the perovskite/hole transporting layer interface. Meanwhile, the DCTP layer effectively inhibits interlayer diffusion of formamidine (FA+), iodide (I−), and lithium (Li+) and ions under thermal stress. As a result, the DCTP‐controlled device produces a champion power conversion efficiency (PCE) of 26.07% with excellent reproducibility, compared to 24.28% for the reference device. More importantly, the operational stability of the device is significantly improved. The DCTP‐treated device retains 90.1% of its initial PCE after 900 h of maximum power point tracking (MPPT) at 65 °C under the ISOS‐L‐2I protocol.

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双膦酸盐嵌入π共轭钝化剂，通过低极性溶剂处理实现高效稳定的n - i - p钙钛矿太阳能电池

界面钝化剂对提高钙钛矿太阳能电池（PSCs）的效率起着至关重要的作用。然而，传统的钝化剂通常需要在高极性溶剂中处理，这可能会导致钙钛矿膜上额外的表面缺陷，从而降低n - i - p psc的效率和稳定性。本文设计并合成了一种双磷酸盐分子（命名为DCTP），以同时解决溶剂相容性、缺陷钝化和孔提取问题。DCTP在低极性溶剂中具有良好的溶解性，如甲苯、氯苯和氯仿，而不会破坏钙钛矿表面。氯苯处理的DCTP中间层可以充分钝化钙钛矿表面缺陷，改善钙钛矿/空穴输运层界面处的能级排列。同时，DCTP层能有效抑制甲脒（FA+）、碘化物（I−）、锂离子（Li+）和其他离子在热应力作用下的层间扩散。结果，与参考器件的24.28%相比，DCTP控制器件产生了26.07%的冠军功率转换效率（PCE），具有出色的再现性。更重要的是，设备的运行稳定性明显提高。在iso - L - 2I协议下，在65°C下进行900小时的最大功率点跟踪（MPPT）后，经DCTP处理的器件保持其初始PCE的90.1%。

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

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.