An Intermediate-Aided Perovskite Phase Purification for High-Performance Solar Cells
In recent years, perovskite solar cells (PSCs) have garnered considerable attention as a prime candidate for next-generation photovoltaic technology. Ensuring the structural stability of perovskites is crucial to the operational reliability of these devices. However, the nonphotoactive yellow phase (δ-FAPbI<sub>3</sub>) of formamidine (FA)-based perovskites is more favorable in thermodynamics, making it challenging to achieve pure α phase in crystallization. Herein, we introduce a language machine learning approach to analyze suitable additives to achieve the desired phase purification. By fast analyzing ∼10<sup>6</sup> abstracts in chemistry and materials science, our approach identifies aminoguanidine (AG) hydrochloride as a promising candidate for intermediate phase formation during nucleation. The experiments confirm that AG forms a novel one-dimensional intermediate phase (AGPbI<sub>3</sub>), which suppresses the solvent intermediate phase and δ-phase formation and promotes development of the α-phase. Consequently, the efficiency of the solar cells increased from 23.99 to 25.46%. The long-term thermal stability and photostability were significantly enhanced owing to the purified α-phase, maintaining 82% of the initial efficiency after 1056 h aging at 85 °C and 94.6% of the initial efficiency after 835 h of illumination in an N<sub>2</sub> atmosphere, respectively. This strategy also enhanced the performance of flexible solar cells, increasing their efficiency from 21.24 to 22.86%. This work is designed to fast explore new intermediate phases in improving the efficiency and operation stability of thin-film solar cells.
Authors
- Xuexiao Chen
- Zixin Zeng (ORCID: https://orcid.org/0000-0001-8145-4044)
- Alex K.‐Y. Jen (ORCID: https://orcid.org/0000-0002-9219-7749)
- Sai‐Wing Tsang (ORCID: https://orcid.org/0000-0003-0788-4905)
- Xinhui Lu (ORCID: https://orcid.org/0000-0002-1908-3294)
- Jiaxue You (ORCID: https://orcid.org/0000-0002-2823-7283)
- Shengzhong Frank Liu (ORCID: https://orcid.org/0000-0002-6338-852X)
- Lu Zhang (ORCID: https://orcid.org/0009-0000-4316-6842)
- Lei Zhang (ORCID: https://orcid.org/0000-0001-6873-7314)
- Yong Wang (ORCID: https://orcid.org/0000-0002-0545-5851)
- Yiru Huang (ORCID: https://orcid.org/0009-0007-7531-2235)
- Yiran Tao
- Hanqing Zeng
- Jinghao Ge
Institutions
- Ministry of Education of the People's Republic of China (CN)
- City University of Hong Kong (HK)
- Chinese University of Hong Kong (HK)
- Dalian Institute of Chemical Physics (CN)
- Chinese Academy of Sciences (CN)
- Nanjing University of Information Science and Technology (CN)
- Advanced Energy Materials (United States) (US)
- University of Chinese Academy of Sciences (CN)
- Shaanxi Normal University (CN)
Publication Details
- Journal
- Journal of the American Chemical Society
- Published
- 2024-12-30
- DOI
- https://doi.org/10.1021/jacs.4c14955
- Citations
- 28
- Primary Topic
- Perovskite Materials and Applications
- Type
- article
- Field-Weighted Citation Impact
- 5.84
Funders
- City University of Hong Kong
- Science and Technology Foundation of Shenzhen City
- National Natural Science Foundation of China
- China Postdoctoral Science Foundation
- Research Grants Council, University Grants Committee
- Innovation and Technology Commission
- Natural Science Foundation of Shaanxi Province
- Higher Education Discipline Innovation Project
- Yulin University
- National Key Research and Development Program of China
- Key Research and Development Projects of Shaanxi Province
- Basic and Applied Basic Research Foundation of Guangdong Province
- Dalian National Laboratory for Clean Energy