Going Beyond Surface Physics: Interface Engineering of <scp>PTAA</scp> for Efficient p‐i‐n Perovskite Photovoltaics
Poor wettability of poly(triarylamine) (PTAA) surfaces and insufficient control over residual PbI 2 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 PbI 2 to decelerate perovskite crystallization kinetics, enabling a more complete conversion of PbI 2 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.
Authors
- Yizebang Xue
- Taomiao Wang
- Yumeng Shi (ORCID: https://orcid.org/0000-0002-9623-3778)
- Jiajie Zhu (ORCID: https://orcid.org/0000-0002-1930-7884)
- Dawei Duan
- Yongjun Li (ORCID: https://orcid.org/0000-0003-1480-4942)
- Haoran Lin (ORCID: https://orcid.org/0000-0003-0625-8881)
- Hanlin Hu (ORCID: https://orcid.org/0000-0001-5617-0998)
- Xianfang Zhou
- Annie Ng (ORCID: https://orcid.org/0000-0002-5975-2499)
- Mingjian Yuan (ORCID: https://orcid.org/0000-0002-2790-9172)
- Baolei Tang (ORCID: https://orcid.org/0009-0009-0111-0870)
- Hongyu Zhang (ORCID: https://orcid.org/0000-0003-0858-8681)
- Fei Wang (ORCID: https://orcid.org/0000-0002-3442-9396)
- Yonghua Chen (ORCID: https://orcid.org/0000-0002-9694-4246)
- Qiannan Li (ORCID: https://orcid.org/0000-0001-5104-6701)
- Xiaoxi Huang
- Yonggui Sun
- Quanyao Zhu
Institutions
- Tongji University (CN)
- Nanjing Tech University (CN)
- Shenzhen Polytechnic University (CN)
- Jilin University (CN)
- Wuhan University of Technology (CN)
- Nankai University (CN)
- Beijing Jiaotong University (CN)
- Bruker (China) (CN)
- State Key Laboratory of Supramolecular Structure and Materials
- Nazarbayev University (KZ)
Publication Details
- Journal
- Energy & environment materials
- Published
- 2025-09-25
- DOI
- https://doi.org/10.1002/eem2.70109
- Citations
- 2
- Primary Topic
- Perovskite Materials and Applications
- Type
- article
- Field-Weighted Citation Impact
- 1.46
Funders
- Department of Education of Guangdong Province
- Nazarbayev University
- Basic and Applied Basic Research Foundation of Guangdong Province