Zezhu Zhou, Nan Wang, Jinguo Cao, Hong Liu, Zihui Liang, Congcong Wu, Dong Yang
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引用次数: 0
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.
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.