Citation: Chen-Wei ZHU, Yi-Nuo JIN, Chun-Hong ZHANG, Heng-Hui CHEN, Shao-Tian CHEN, Yu-Ming FU, Yun-Jia WU, Wei-Hai SUN. High-performance and stable perovskite solar cells prepared with a green bi-solvent method[J]. Chinese Journal of Inorganic Chemistry, ;2023, 39(6): 1061-1071. doi: 10.11862/CJIC.2023.084 shu

High-performance and stable perovskite solar cells prepared with a green bi-solvent method

Engineering Research Center of Environment-Friendly Functional Materials, Ministry of Education, Fujian Key Laboratory of Photoelectric Functional Materials, Institute of Materials Physical Chemistry, School of Materials Science and Engineering, Huaqiao University, Xiamen, Fujian 361021, China

Corresponding author: Wei-Hai SUN, sunweihai@hqu.edu.cn
Received Date: 23 December 2022
Revised Date: 4 May 2023

Figures(7)

To simplify the fabrication procedures and improve the film quality, herein we used a bi-solvent system containing water and ethylene glycol methyl ether (EGME), which is less toxic and environmentally friendly. The bi-solvent (Volume ratio: 1:1) can dissolve CsBr and improve the solubility of CsBr, decreasing rapidly the spinning times of CsBr methanol solution and streamlining immensely multistep processes into a classical two-step methodology. The results from scanning electron microscopy (SEM) images and X-ray diffraction (XRD) patterns verify the formation of a compact, homogeneous, and uniform CsPbBr₃ film by the bi-solvent system. Based on this bi-solvent system, the ideal parameters during the film deposition were also discovered. In addition, we notice that the CsPbBr₃ film still existed in some large-size random phases, which can be deducted as the excessive CsPb₂Br₅ phase through XRD patterns. For further perfection, we explore the influence of CsBr methanol solution spinning times right after the modified two-step process. The subsequently-spinning CsBr can act as a surface modifier to diminish the undesired impurity, thus enhancing the film quality and the efficiency of as-constructed CsPbBr₃-based perovskite solar cells (PSCs). As a result, CsPbBr₃-based PSCs, prepared by spinning coating one time with a water/EGME solution and two times with the methanol solution of CsBr, had the optimal performance. It can reach open-circuit voltage (V_OC), short circuit current density (J_SC), fill factor (FF) of 1.44 V, 6.26 mA·cm^-2, 74.57%, and the ultimate photoelectric conversion efficiency (PCE) attained 6.72%.
- all-inorganic perovskites solar cells,
- CsPbBr₃,
- green bi-solvent,
- ethylene glycol methyl ether
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