Suppressing “Coffee ring effect” to deposit high-quality CsPbI3 perovskite films by drop casting

Qixian Zhang, Huicong Liu, Xue Tan, Hailiang Wang, Yongfa Song, Xiaozhen Wei, Yue Deng, Weiping Li, Liqun Zhu, Zhenhua Cui, Yang Bai*, Haining Chen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)

Abstract

Inorganic CsPbI3 perovskite has shown much promise as a light absorber in perovskite solar cells (PSCs) due to its appropriate optical bandgap and high chemical stability. However, it is still a great challenge to deposit large-area CsPbI3 perovskite films by existing methods (e.g. spin coating). Herein, a facile and scalable strategy based on a drop-casting process is developed. To mitigate the coffee ring effect (CRE) that commonly occurs during drop casting, a vacuum-assisted (VA) process is exploited to boost solvent extraction, which significantly reduces the difference in solvent evaporation rates at the edge and middle regions of droplets. As a result, uniform CsPbI3 perovskite films with higher crystallinity and lower defect density are deposited by drop casting. By using the CsPbI3 perovskite film as a light absorber, the carbon-based CsPbI3 PSCs without hole transport layer achieves an efficiency of 16.33 %, a new record for inorganic C-PSCs. After finely controlling deposition processes, a large-area CsPbI3 perovskite film (5 × 5 cm2) with excellent uniformity can be easily prepared by the drop casting method.

Original languageEnglish
Article number140147
JournalChemical Engineering Journal
Volume454
DOIs
Publication statusPublished - 15 Feb 2023

Keywords

  • Carbon electrode
  • Coffee ring effect
  • CsPbI
  • Drop casting

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Zhang, Q., Liu, H., Tan, X., Wang, H., Song, Y., Wei, X., Deng, Y., Li, W., Zhu, L., Cui, Z., Bai, Y., & Chen, H. (2023). Suppressing “Coffee ring effect” to deposit high-quality CsPbI3 perovskite films by drop casting. Chemical Engineering Journal, 454, Article 140147. https://doi.org/10.1016/j.cej.2022.140147