Dual-Functional Guanidinium Iodide Interfacial Engineering for Efficient and Stable Dion–Jacobson Perovskite Solar Cells

IF 5.3 3区 工程技术 Q2 ENERGY & FUELS
Jingwei Mao, , , Yufeng Liu, , , Ying Ding, , , Jiawen Song, , , Zhengzong Lu, , , Lifeng Piao, , , Zhenlin Wu, , , Yefu Liu, , and , Yi Wei*, 
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Abstract

Perovskite solar cells (PSCs) have achieved over 27% efficiency in just a decade, yet their long-term stability remains a commercialization bottleneck. Quasi-two-dimensional (quasi-2D) perovskites, particularly Dion–Jacobson (DJ) phases, have garnered significant attention due to their superior environmental stability compared with three-dimensional (3D) counterparts. Despite this, quasi-2D PSCs still lag behind in efficiency owing to intrinsic defects at grain boundaries and interfaces; these defects also facilitate moisture ingress and accelerate degradation. To address these limitations, this work introduces a stable DJ-phase perovskite based on 1,4-cyclohexanedimethanamine (CDMA) and employs guanidinium iodide (GUAI) as an interfacial modifier. The multifunctional GUAI layer synergistically passivates cation vacancies, heals deep-level defects, and smooths grain boundaries through interactions between its electron-rich guanidinium groups and iodide ions. This dual-action strategy enhances charge extraction, suppresses nonradiative recombination, and strengthens moisture resistance. Consequently, GUAI-modified 2D PSCs achieve a champion PCE of 15.07% (vs 13.25% for control devices) with an open-circuit voltage of 1.09 V and fill factor of 70.68%. Remarkably, the unencapsulated device retains 92% of its initial PCE after 2500 h in ambient air (35–75% RH), demonstrating exceptional operational stability. This work provides a scalable approach to enhance the efficiency and stability in perovskite photovoltaics.

Abstract Image

高效稳定Dion-Jacobson钙钛矿太阳能电池的双功能碘化胍界面工程
钙钛矿太阳能电池(PSCs)在短短十年内实现了27%以上的效率,但其长期稳定性仍然是商业化的瓶颈。准二维(准2d)钙钛矿,特别是Dion-Jacobson (DJ)相,由于其与三维(3D)相相比具有优越的环境稳定性而引起了极大的关注。尽管如此,由于晶界和界面的固有缺陷,准二维psc的效率仍然落后;这些缺陷也会促进水分进入并加速降解。为了解决这些限制,本研究引入了一种基于1,4-环己二甲胺(CDMA)的稳定的dj相钙钛矿,并使用碘化胍(GUAI)作为界面改性剂。多功能GUAI层通过富电子的胍基团和碘离子之间的相互作用协同钝化阳离子空位,修复深层次缺陷,并平滑晶界。这种双重作用策略增强电荷提取,抑制非辐射复合,并增强抗湿性。因此,guai修饰的2D PSCs在开路电压1.09 V和填充因子70.68%的情况下实现了15.07%的冠军PCE(而控制器件为13.25%)。值得注意的是,未封装的设备在环境空气中(35-75% RH) 2500小时后仍保持92%的初始PCE,表现出卓越的运行稳定性。这项工作提供了一种可扩展的方法来提高钙钛矿光伏电池的效率和稳定性。
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来源期刊
Energy & Fuels
Energy & Fuels 工程技术-工程:化工
CiteScore
9.20
自引率
13.20%
发文量
1101
审稿时长
2.1 months
期刊介绍: Energy & Fuels publishes reports of research in the technical area defined by the intersection of the disciplines of chemistry and chemical engineering and the application domain of non-nuclear energy and fuels. This includes research directed at the formation of, exploration for, and production of fossil fuels and biomass; the properties and structure or molecular composition of both raw fuels and refined products; the chemistry involved in the processing and utilization of fuels; fuel cells and their applications; and the analytical and instrumental techniques used in investigations of the foregoing areas.
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