PTAA-Based Perovskite Photovoltaics Catching up: Ionic Liquid Engineering-Assisted Crystallization Through Sequential Deposition
Li Y. Wang F. Li Q. Tang B. Sun Y. Wang T. Liang X. Ma J. Zhou X. Zhang F. Li X. Tong Y. Hu R. Yuan M. Wu T. Ng A. Hu H.
17 April 2025John Wiley and Sons Inc
Advanced Science
2025#12Issue 15
PTAA as a widely studied polymeric hole transporting material, has garnered significant attention due to its outstanding thermal and chemical stability. However, the performance of PTAA-based p-i-n devices is shown to lag behind counterpart utilizing oxides or SAMs. In this study, the ionic liquid, 1-ethyl-3-methylimidazolium formate (EMIMCOOH), is innovatively introduced into the lead iodide (PbI2) precursor solution, resulting in a more pronounced mesoporous PbI2 film with expended pore-size and denser pores. This enhancement is attributed to the coordination bond between the ─C═O group in EMIMCOOH and Pb2+. This intensified mesoporous morphology not only facilities the reaction between PbI2 and the organic layer, but also promotes the PbI2 conversion into perovskite material. Importantly, the incorporation of EMIMCOOH slows down the perovskite conversion process, increasing perovskite domain size and suppressed Pb0 trap density, resulting in a uniform perovskite layer with enhanced charge transport properties, as evidenced by the conducting atomic force microscope (c-AFM) results. As a result, the incorporation of EMIMCOOH yields a power conversion efficiency (PCE) of 24.10% and a high fill factor exceeding 85%. Notably, the PCE of the EMIMCOOH-modified device can still maintain 86% of the initial value after 1500 h at 25 °C in an N2 atmosphere.
crystallinity , ionic liquid , p-i-n , perovskite solar cells , PTAA
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Hoffmann Institute of Advanced Materials, Shenzhen Polytechnic University, 7098 Liuxian Boulevard, Shenzhen, 518055, China
Jiangsu Provincial Engineering Research Center of Low-Dimensional Physics and New Energy & School of Science, Key Laboratory for Organic Electronics and Information Displays & Institute of Advanced Materials (IAM), Jiangsu National Synergistic Innovation Center for Advanced Materials (SICAM), Nanjing University of Posts and Telecommunications, Nanjing, 210023, China
State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, School of Materials Science and Engineering, Wuhan University of Technology, Wuhan, 430070, China
Medical Intelligence and Innovation Academy, Southern University of Science and Technology Hospital, Shenzhen, 518055, China
College of Chemistry, Nankai University, Tianjin, 300071, China
Department of Applied Physics, The Hong Kong Polytechnic University, Kowloon, Hong Kong
Department of Electrical and Computer Engineering, School of Engineering and Digital Sciences, Nazarbayev University, 53 Kabanbay Batyr Avenue, Astana, 010000, Kazakhstan
Hoffmann Institute of Advanced Materials
Jiangsu Provincial Engineering Research Center of Low-Dimensional Physics and New Energy & School of Science
State Key Laboratory of Advanced Technology for Materials Synthesis and Processing
Medical Intelligence and Innovation Academy
College of Chemistry
Department of Applied Physics
Department of Electrical and Computer Engineering
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