Reinforcing CsPbI3 all-inorganic perovskite grain boundaries through bilateral cyano-based molecular cross-linking for efficient and stable solar cells

IF 3.6 2区物理与天体物理 Q2 PHYSICS, APPLIED

Applied Physics Letters Pub Date : 2026-04-15 DOI:10.1063/5.0326762

Chenyu Wang, Haofeng Zhang, Yunxiao Wei, Pengfei Li, Ping Lin, Tiantian Liu, Xiaoping Wu, Peng Wang, Xuegong Yu, Zhenyi Ni, Can Cui, Lingbo Xu

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引用次数: 0

Abstract

CsPbI3 all-inorganic perovskite solar cells (PSCs) are highly promising for photovoltaics owing to their excellent thermal stability and suitable bandgap. However, their performance and operational stability are often compromised by weak grain boundaries accompanied by a high density of defects. To overcome this limitation, we introduce succinonitrile (SN) as a multifunctional additive. SN features a flexible carbon chain terminated with cyano (–C≡N) groups at both ends, enabling it to coordinate strongly with Pb2+ via Lewis acid–base interactions and thereby act as a molecular cross-linker between adjacent grains. This bilateral coordination facilitates controlled crystallization, improves film morphology, passivates grain-boundary defects, and increases moisture resistance. As a result, the power conversion efficiency of SN-modified CsPbI3 PSCs increases from 14.52% to 16.17%, accompanied by significantly improved environmental stability. This work provides useful guidance for the design of efficient additives toward high-performance and stable all-inorganic CsPbI3 PSCs.

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通过双边氰基分子交联增强CsPbI3全无机钙钛矿晶界，用于高效稳定的太阳能电池

CsPbI3全无机钙钛矿太阳能电池（PSCs）由于其优异的热稳定性和合适的带隙，在光伏领域具有很大的应用前景。然而，它们的性能和操作稳定性往往受到弱晶界和高密度缺陷的影响。为了克服这一限制，我们引入了丁二腈（SN）作为多功能添加剂。SN具有两端以氰基（-C≡N）为末端的柔性碳链，使其能够通过刘易斯酸碱相互作用与Pb2+强配位，从而充当相邻晶粒之间的分子交联剂。这种双边配合有利于控制结晶，改善薄膜形态，钝化晶界缺陷，并增加抗湿性。结果表明，sn修饰的CsPbI3 PSCs的功率转换效率从14.52%提高到16.17%，同时环境稳定性显著提高。本研究为设计高性能稳定的全无机CsPbI3聚酰亚胺的高效添加剂提供了有益的指导。

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

Applied Physics Letters 物理-物理：应用

CiteScore

6.40

自引率

10.00%

发文量

1821

审稿时长

1.6 months

期刊介绍： Applied Physics Letters (APL) features concise, up-to-date reports on significant new findings in applied physics. Emphasizing rapid dissemination of key data and new physical insights, APL offers prompt publication of new experimental and theoretical papers reporting applications of physics phenomena to all branches of science, engineering, and modern technology. In addition to regular articles, the journal also publishes invited Fast Track, Perspectives, and in-depth Editorials which report on cutting-edge areas in applied physics. APL Perspectives are forward-looking invited letters which highlight recent developments or discoveries. Emphasis is placed on very recent developments, potentially disruptive technologies, open questions and possible solutions. They also include a mini-roadmap detailing where the community should direct efforts in order for the phenomena to be viable for application and the challenges associated with meeting that performance threshold. Perspectives are characterized by personal viewpoints and opinions of recognized experts in the field. Fast Track articles are invited original research articles that report results that are particularly novel and important or provide a significant advancement in an emerging field. Because of the urgency and scientific importance of the work, the peer review process is accelerated. If, during the review process, it becomes apparent that the paper does not meet the Fast Track criterion, it is returned to a normal track.