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Solvent modification to suppress halide segregation in mixed halide perovskite solar cells

  • Advanced Nano Materials
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Abstract

Mixed halide perovskite is essential to construct highly efficient tandem solar cells, whereas halide segregation is a main issue hindering their device efficiency for this kind of perovskite materials. Herein, we modify the solvents for the mixed halide precursor solution to suppress halide segregation during fabrication process. An alternative solvent, N-Methyl pyrrolidone (NMP), is used to replace commonly used solvent, dimethyl sulfoxide (DMSO). It is shown that the halide segregation and the resultant carrier recombination are notably suppressed. The improvements brought by NMP may correlate with its moderate Lewis base property, which modifies the crystallization process of the mixed halide perovskite film. Consequently, the device performance is greatly improved by using NMP. The device efficiency is increased from less than 10% for DMSO solvent to approach 14% for NMP solvent. This work provides a facile way to improve the device efficiency, which also highlights on the importance of the solvents on halide segregation.

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Acknowledgements

This work was supported by the Fundamental Research Funds for the Central Universities 2018YJS172, the National Natural Science Foundation of China under Grant Nos. 61575019 and 61775013; the Fundamental Research Funds for the Central Universities with the Grant Nos. 2017RC034, 2017RC015 and 2017JBZ105.

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Authors and Affiliations

  1. Key Laboratory of Luminescence and Optical Information, Ministry of Education, Beijing Jiaotong University, Beijing, 100044, China

    Yaoyao Li, Dandan Song, Juan Meng, Jie Dong, Yao Lu, Xiaomin Huo, Ayman Maqsood, Yuhang Song, Suling Zhao, Bo Qiao & Zheng Xu

  2. Institute of Optoelectronics Technology, Beijing Jiaotong University, Beijing, 100044, China

    Yaoyao Li, Dandan Song, Juan Meng, Jie Dong, Yao Lu, Xiaomin Huo, Ayman Maqsood, Suling Zhao, Bo Qiao & Zheng Xu

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  1. Yaoyao Li
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  2. Dandan Song
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Correspondence to Dandan Song or Zheng Xu.

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Li, Y., Song, D., Meng, J. et al. Solvent modification to suppress halide segregation in mixed halide perovskite solar cells. J Mater Sci 55, 9787–9794 (2020). https://doi.org/10.1007/s10853-020-04697-1

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