Coordinating energy-level alignment and morphology in perovskite–organic heterostructures for efficient and stable solar cells

IF 21.1 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: R: Reports Pub Date : 2026-01-01 Epub Date: 2025-12-06 DOI:10.1016/j.mser.2025.101165

Ben Fan, Qizhi Jiang, Xingjian Dai, Xiaopeng Xu, Yihui Wu, Qiang Peng

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引用次数: 0

Abstract

Perovskite–organic heterostructure photovoltaics can extend spectral response into the near-infrared while maintaining high photovoltage, yet their efficiencies have trailed best-in-class perovskite single junctions due to interfacial charge accumulation arising from energy-level mismatches, limited carrier mobility, and unfavorable contact at the perovskite/bulk-heterojunction (BHJ) interface. Here, we develop a synergistic ternary-D18-Cl:PY-IT:PC₇₁BM-concurrently coordinates morphology and interfacial energetics. The polymeric acceptor PY-IT suppresses excessive aggregation and promotes well-intermixed percolation, while D18-Cl enhances mobility and PC71BM provides an energy “springboard” that alleviates residual donor-induced misalignment. Devices based on this architecture achieve an impressive power conversion efficiency of 26.19 % with a fill factor above 85 % and outstanding operational stability. Spectroscopy and device diagnostics reveal substantially reduced interfacial charge accumulation, suppressed non-radiative losses, and balanced interfacial transport compared with conventional small-molecule acceptor–dominated BHJs. This work presents a general strategy that links ternary BHJ design to interfacial charge control, offering a pathway for high-efficiency, durable perovskite–organic heterostructure solar cells (HSCs).

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高效稳定太阳能电池中钙钛矿-有机异质结构的协调能级排列和形态

钙钛矿-有机异质结构光伏电池可以在保持高光电电压的情况下将光谱响应扩展到近红外，但由于能级不匹配引起的界面电荷积累、载流子迁移率有限以及钙钛矿/体异质结（BHJ）界面的不利接触，它们的效率落后于同类最佳的钙钛矿单结。在这里，我们开发了一个协同三元- d18 - cl:PY-IT: pc71bm -同时协调形态和界面能量。聚合物受体PY-IT抑制过度聚集，促进良好混合的渗透，而D18-Cl增强迁移率，PC71BM提供能量“跳板”，减轻残留供体诱导的错位。基于该架构的器件实现了令人印象深刻的26.19 %的功率转换效率，填充系数高于85 %，并且具有出色的运行稳定性。光谱学和设备诊断显示，与传统的小分子受体主导的bhj相比，它大大减少了界面电荷积累，抑制了非辐射损失，并平衡了界面传输。这项工作提出了一种将三元BHJ设计与界面电荷控制联系起来的一般策略，为高效、耐用的钙钛矿-有机异质结构太阳能电池（hsc）提供了一条途径。

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来源期刊

Materials Science and Engineering: R: Reports 工程技术-材料科学：综合

CiteScore

60.50

自引率

0.30%

发文量

审稿时长

34 days

期刊介绍： Materials Science & Engineering R: Reports is a journal that covers a wide range of topics in the field of materials science and engineering. It publishes both experimental and theoretical research papers, providing background information and critical assessments on various topics. The journal aims to publish high-quality and novel research papers and reviews. The subject areas covered by the journal include Materials Science (General), Electronic Materials, Optical Materials, and Magnetic Materials. In addition to regular issues, the journal also publishes special issues on key themes in the field of materials science, including Energy Materials, Materials for Health, Materials Discovery, Innovation for High Value Manufacturing, and Sustainable Materials development.