Going Beyond Surface Physics: Interface Engineering of PTAA for Efficient p-i-n Perovskite Photovoltaics
Li Q. Wang F. Li Y. Tang B. Duan D. Wang T. Sun Y. Zhou X. Xue Y. Zhu J. Zhu Q. Huang X. Lin H. Ng A. Shi Y. Yuan M. Zhang H. Chen Y. Hu H.
March 2026John Wiley and Sons Inc
Energy and Environmental Materials
2026#9Issue 2
Poor wettability of poly(triarylamine) (PTAA) surfaces and insufficient control over residual PbI2 clusters remain critical bottlenecks limiting the performance of PTAA-based p-i-n perovskite solar cells (PSCs). Herein, we introduce an effective interface engineering strategy through the incorporation of the ionic liquid 1-butyl-3-methylimidazolium acetate (BMIMAc). Owing to its strong affinity for the perovskite precursor solvent (N,N-dimethylformamide, DMF), BMIMAc significantly enhances PTAA wettability, promoting the formation of uniform and defect-passivated perovskite films. In addition, BMIMAc modulates the energy level alignment of PTAA, facilitating more efficient hole extraction and transport across the interface. More importantly, BMIMAc interacts with PbI2 to decelerate perovskite crystallization kinetics, enabling a more complete conversion of PbI2 into the perovskite phase. This synergistic regulation yields perovskite films with enlarged grain sizes, reduced trap densities, and suppressed nonradiative recombination losses. Benefiting from these advances, the optimized PTAA-based p-i-n PSCs achieve a record-high power conversion efficiency of 25.10% with significantly enhanced operational stability.
crystallinity , ionic liquid , p-i-n perovskite solar cells , PTAA , wettability
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Hoffmann Institute of Advanced Materials, Shenzhen Polytechnic University, Shenzhen, 518055, China
State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun, 130012, China
State key Laboratory of Advanced Glass Materials, Wuhan University of Technology, Wuhan, 430070, China
Bruker (Beijing) Scientific Technology Co., Ltd, Beijing, 100192, China
School of Physics Science and Engineering, Tongji University, Shanghai, 200092, China
Department of Electrical and Computer Engineering, School of Engineering and Digital Sciences, Nazarbayev University, 53 Kabanbay Batyr Avenue, Astana, 010000, Kazakhstan
Key Laboratory of Luminescence and Optical Information, Ministry of Education, Institute of Optoelectronic Technology, Beijing Jiaotong University, Beijing, 100044, China
College of Chemistry, Nankai University, Tianjin, 300071, China
Key Laboratory of Flexible Electronics (KLoFE) & Institute of Advanced Materials (IAM), School of Flexible Electronics (Future Technologies), Nanjing Tech University (NanjingTech), Nanjing, 211816, China
Hoffmann Institute of Advanced Materials
State Key Laboratory of Supramolecular Structure and Materials
State key Laboratory of Advanced Glass Materials
Bruker (Beijing) Scientific Technology Co.
School of Physics Science and Engineering
Department of Electrical and Computer Engineering
Key Laboratory of Luminescence and Optical Information
College of Chemistry
Key Laboratory of Flexible Electronics (KLoFE) & Institute of Advanced Materials (IAM)
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