Dual-Ion Synergy Breaks 20% Barrier in Electron Transport Layer-Free Perovskite Solar Modules

IF 13 2区 材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Small Pub Date : 2025-06-03 DOI:10.1002/smll.202503892
Zezhu Zhou, Nan Wang, Jinguo Cao, Hong Liu, Zihui Liang, Congcong Wu, Dong Yang
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Abstract

Electron transport layer-free (ETL-free) perovskite solar cells (PSCs) represent a promising research direction for the industrial-scale deployment of next-generation technologies. However, achieving efficiency exceeding 20% in ETL-free PSCs requires the incorporation of an intermediate layer between perovskite and electrode, which undermines the fundamental goal of simplified device architecture. Herein, 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (EMIMTFSI) is used to passivate perovskite film. This process occurs through distinct enrichment mechanisms involving both the anionic and cationic species of EMIMTFSI, which results in notable enhancements in the efficiency and stability of ETL-free PSCs. Experimental results confirm that EMIM+ and TFSI interact with uncoordinated iodide and lead ions in the perovskite, respectively. Furthermore, the fluorine in TFSI forms a hydrogen bond with the N-H group in perovskite. The synergistic effects of these interactions contribute to enhanced crystallization, improved energy level alignment, and reduced defects in perovskite film. As a result, the device achieves an efficiency of 22.08% with excellent stability under environmental and light exposure. Importantly, the ETL-free perovskite solar module with an efficiency of 20.27% is first reported. This study presents a simplified approach to boost the performanceof ETL-free PSCs, providing an effective pave for the cost-effective commercialization of perovskite photovoltaics.

Abstract Image

双离子协同突破电子输运无层钙钛矿太阳能组件的20%障碍
无电子传输层(ETL-free)钙钛矿太阳能电池(PSCs)代表了下一代技术工业规模部署的一个有前途的研究方向。然而,在无etl的psc中实现超过20%的效率需要在钙钛矿和电极之间加入中间层,这破坏了简化器件结构的基本目标。本文采用1-乙基-3-甲基咪唑双(三氟甲基磺酰基)亚胺(EMIMTFSI)钝化钙钛矿膜。该过程通过不同的富集机制发生,涉及EMIMTFSI的阴离子和阳离子物种,这导致无etl的psc的效率和稳定性显著提高。实验结果证实,EMIM+和TFSI -分别与钙钛矿中的非配位碘化物和铅离子相互作用。此外,TFSI−中的氟与钙钛矿中的N-H基团形成氢键。这些相互作用的协同效应有助于增强结晶,改善能级排列,并减少钙钛矿薄膜中的缺陷。结果表明,该器件的效率为22.08%,在环境和光照下具有优异的稳定性。重要的是,首次报道了效率为20.27%的无etl钙钛矿太阳能组件。本研究提出了一种简化的方法来提高无etl的PSCs的性能,为钙钛矿光伏电池的成本效益商业化提供了有效的铺垫。
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来源期刊
Small
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.
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