Zwitterionic Ionic Liquid Confer Defect Tolerance, High Conductivity, and Hydrophobicity toward Efficient Perovskite Solar Cells Exceeding 22% Efficiency
Yang L, Ma X, Shang X, Gao D, Wang C, Li M, Chen C, Zhang B, Xu S, Zheng S, Song H (2021)
Publication Type: Journal article
Publication year: 2021
Journal
Abstract
Defect passivation has been a promising route for enhancing the power conversion efficiency (PCE) and stability of perovskite solar cells (PSCs). Herein, defect inhibition in two-step solution-processed (FAPbI3)1−x(MAPbBr3)x films via a rationally designed zwitterionic ionic liquid (ZIL) with 4-fluoro-phenylammonium (4FB+) as cations and tetrafluoroborate (BF4−) as anions is demonstrated. First, 4FB+ and BF4− can effectively fill vacancy defects caused by the migrated organic A-site cation and halogen anion, confirmed by X-ray photoelectron spectroscopy. Second, the 4FB+ with π conjugated benzene ring can donate electrons for carrier extraction, whereas its fluorination of the phenyl ammonium could enhance moisture blocking through the molecular packing of C-F bond. The electrical characterization, including space charge limited current and Mott–Schottky measurement, proves the enhanced carrier extraction and photovoltaic performance. Third, the pseudohalogen anion BF4− with high ionic conductivity could significantly enhance the carrier lifetime and reduce the VOC loss. As a result, the ZIL-modified PSCs can achieve a high PCE of 22.5% with excellent long-term stability maintaining more than 80% of the initial efficiency after storing in an ambient condition for 2000 h. Herein, a new paradigm toward accelerating the development of efficient and stable PSCs is opened up.
Involved external institutions
Dalian Medical University / 大连医科大学
China (CN)
Hebei University of Technology (HEBUT) / 河北工业大学
China (CN)
Jilin University (JLU) / 吉林大学
China (CN)
China (CN)
Hebei University of Technology (HEBUT) / 河北工业大学
China (CN)
Jilin University (JLU) / 吉林大学
China (CN)
How to cite
APA:
Yang, L., Ma, X., Shang, X., Gao, D., Wang, C., Li, M.,... Song, H. (2021). Zwitterionic Ionic Liquid Confer Defect Tolerance, High Conductivity, and Hydrophobicity toward Efficient Perovskite Solar Cells Exceeding 22% Efficiency. Solar RRL. https://dx.doi.org/10.1002/solr.202100352
MLA:
Yang, Liqun, et al. "Zwitterionic Ionic Liquid Confer Defect Tolerance, High Conductivity, and Hydrophobicity toward Efficient Perovskite Solar Cells Exceeding 22% Efficiency." Solar RRL (2021).
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