Acetic acid assisted crystallization strategy for high efficiency and long-term stable perovskite solar cell

Yong Li, Junwei Shi, Jianghui Zheng, Jueming Bing, Jianyu Yuan, Yongyoon Cho, Shi Tang, Meng Zhang, Yin Yao, Cho Fai Jonathan Lau, Da Seul Lee, Chwenhaw Liao, Martin A. Green, Shujuan Huang, Wanli Ma*, Anita W. Y. Ho-Baillie

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

97 Citations (Scopus)
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Improving the quality of perovskite poly-crystalline film is essential for the performance of associated solar cells approaching their theoretical limit efficiency. Pinholes, unwanted defects, and nonperovskite phase can be easily generated during film formation, hampering device performance and stability. Here, a simple method is introduced to prepare perovskite film with excellent optoelectronic property by using acetic acid (Ac) as an antisolvent to control perovskite crystallization. Results from a variety of characterizations suggest that the small amount of Ac not only reduces the perovskite film roughness and residual PbI2 but also generates a passivation effect from the electron-rich carbonyl group (C=O) in Ac. The best devices produce a PCE of 22.0% for Cs0.05FA0.80MA0.15Pb(I0.85Br0.15)3 and 23.0% for Cs0.05FA0.90MA0.05Pb(I0.95Br0.05)3 on 0.159 cm2 with negligible hysteresis. This further improves device stability producing a cell that maintained 96% of its initial efficiency after 2400 h storage in ambient environment (with controlled relative humidity (RH) <30%) without any encapsulation.

Original languageEnglish
Article number1903368
Pages (from-to)1-10
Number of pages10
JournalAdvanced Science
Issue number5
Early online date23 Jan 2020
Publication statusPublished - 4 Mar 2020

Bibliographical note

Copyright the Author(s) 2020. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.


  • crystal engineering
  • perovskites
  • photovoltaic
  • stability


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