期刊
JOURNAL OF ENERGY CHEMISTRY
卷 63, 期 -, 页码 558-565出版社
ELSEVIER
DOI: 10.1016/j.jechem.2021.08.021
关键词
CsPbI2Br; Low temperature; Secondary crystallization; High performance
资金
- National Natural Science Foundation of China [61704131, 61804111]
- National Key Research and Development Program of China [2018YFB2202900]
- Key Research and Development Program of Shaanxi Province [2020GY-310]
- Joint Research Funds of Department of Science AMP
- Technology of Shaanxi Province [2020GXLH-Z-018]
- Northwestern Polytechnical University [2020GXLH-Z-018]
- Fundamental Research Funds for the Central Universities
- Innovation Fund of Xidian University
The utilization of secondary crystallization strategy has improved the performance and stability of CsPbI2Br perovskite solar cells in a facile n-i-p structure, achieving a high open-circuit voltage and power conversion efficiency.
Inorganic CsPbI2Br perovskite solar cells (PSCs) have a tremendous development in last few years due to the trade-off between the excellent optoelectronic properties and the relatively outstanding stability. Herein, we demonstrated a strategy of secondary crystallization (SC) for CsPbI2Br film in a facile planar n-i-p structure (ITO/ZnO-SnO2/CsPbI2Br/Spiro-OMeTAD/Ag) at low-temperature (150 degrees C). It is achieved through the method of post-treatment with guanidinium bromine (GABr) atop annealed CsPbI2Br film. It was found that the secondary crystallization by GABr can not only regulate the crystal growth and passivate defects, but also serve as a charge collection center to effectively collect photogenerated carriers. In addition, due to the excess Br ions in GABr, the formation of the Br-rich region at the CsPbI2Br perovskite surface can further lower the Fermi level, leading to more beneficial band alignment between the perovskite and the hole transport layer (HTL), while the phase stability was also improved. As a result, the champion cell shows a superb open-circuit voltage (V-oc) of 1.31 V, a satisfactory power conversion efficiency (PCE) of 16.97% and outstanding stabilities. As far as we know, this should be one of the highest PCEs reported among all-inorganic CsPbI2Br based PSCs. (C) 2021 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by ELSEVIER B.V. and Science Press. All rights reserved.
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