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New insight into solvent engineering technology from evolution of intermediates via one-step spin-coating approach

一步旋涂法中反溶剂对中间相演变的新视角

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Abstract

The anti-polar solvent technique is an effective way to improve the film quality in a perovskite solar cell. In this work, we reveal the reason why chlorobenzene (CBZ) plays an important role in controlling the crystallization process. By investigating the formation of intermediate phases in the precursor solution, we observed that the CH3NH3I (MAI)-PbI2-dimethylformamide (DMF) or MAI-PbI2-dimethylsulphoxide (DMSO) adducts have not yet formed until washed with non-polar solvent. The accelerated formation of intermediate phase yields high crystalline perovskite layers. Rapid solvent evaporation and retarded perovskite crystallization in one-step method are efficient to obtain high-quality perovskite films. Consequently, MAI-PbI2-DMSO intermediate shows neat rod-like structure with high crystallinity, which eventually transforms extremely dense and uniform perovskite films.

摘要

反溶剂技术可以有效改善钙钛矿薄膜的质量. 本文揭示了氯苯(CBZ) 在结晶过程中起的重要作用. 通过研究前体溶液中配合物的结 构变化, 我们观察到, 在滴加反溶剂之前, MAI-PbI2-DMF或MAI-PbI2-DMSO尚未形成. 快速去除多余溶剂后形成中间相, 延缓钙钛矿结晶是 得到高质量钙钛矿薄膜的关键. 其中MAI-PbI2-DMSO中间体表现出了高结晶的棒状结构, 因此最终转变成非常致密和均匀的钙钛矿薄膜.

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Acknowledgments

This work was supported by the National Basic Research Program of China (2016YFA0202400 and 2015CB932200), the National Natural Science Foundation of China (21403247), the External Cooperation Program of BIC, Distinguished Youth Foundation of Anhui Province (1708085J09), Chinese Academy of Sciences (GJHZ1607), and STS project of Chinese Academy of Sciences (KFJ-SW-STS-152).

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Authors and Affiliations

  1. Beijing Key Laboratory of Novel Thin-Film Solar Cells, North China Electric Power University, Beijing, 102206, China

    Yingke Ren  (任英科) & Songyuan Dai  (戴松元)

  2. Key Laboratory of Novel Thin-Film Solar Cells, Institute of Applied Technology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, 230031, China

    Bin Duan  (段滨), Yafeng Xu  (徐亚峰), Yang Huang  (黄阳), Zhaoqian Li  (李兆乾), Linhua Hu  (胡林华), Jun Zhu  (朱俊) & Songyuan Dai  (戴松元)

  3. NAAM Research Group, Department of Mathematics, Faculty of Science, King Abdulaziz University, Jeddah, 21589, Saudi Arabia

    Tasawar Hayat & Songyuan Dai  (戴松元)

  4. School of Chemistry, Physics and Mechanical Engineering Queensland University of Technology, Brisbane, QLD, 4001, Australia

    Hongxia Wang  (王红霞)

Authors
  1. Yingke Ren  (任英科)
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  2. Bin Duan  (段滨)
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  3. Yafeng Xu  (徐亚峰)
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  4. Yang Huang  (黄阳)
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  5. Zhaoqian Li  (李兆乾)
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  6. Linhua Hu  (胡林华)
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  7. Tasawar Hayat
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  8. Hongxia Wang  (王红霞)
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  9. Jun Zhu  (朱俊)
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  10. Songyuan Dai  (戴松元)
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Corresponding authors

Correspondence to Jun Zhu  (朱俊) or Songyuan Dai  (戴松元).

Additional information

Yingke Ren obtained his BSc degree from Hebei Normal University in 2011. He is a PhD candidate of the North China Electric Power University under the supervision of Prof. Jun Zhu and Prof. Songyuan Dai. His research interests mainly focus on perovskite solar cells.

Jun Zhu received his PhD degree from the University of Science and Technology of China in 2005. He joined Hefei Institutes of Physical Science, Chinese Academy of Sciences and was promoted to full professor in 2015. Now his research interests focus on the new generation solar cells, including quantum dot solar cells and perovskite solar cells.

Songyuan Dai is a professor and Dean of the School of Renewable Energy, North China Electric Power University. He obtained his BSc degree in physics from Anhui Normal University in 1987, and MSc and PhD degrees in plasma physics from the Institute of Plasma Physics, Chinese Academy of Sciences in 1991 and 2001, respectively. His research interests mainly focus on the next-generation solar cells including dye-sensitized solar cells, quantum dot solar cells, perovskite solar cells, etc.

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Ren, Y., Duan, B., Xu, Y. et al. New insight into solvent engineering technology from evolution of intermediates via one-step spin-coating approach. Sci. China Mater. 60, 392–398 (2017). https://doi.org/10.1007/s40843-017-9027-1

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  • DOI: https://doi.org/10.1007/s40843-017-9027-1

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