Steering the crystallization of perovskites for high-performance solar cells in ambient air

Feng Wang, Ting Zhang, Yafei Wang, Detao Liu, Peng Zhang, Hao Chen, Long Ji, Li Chen, Zhi David Chen, Jiang Wu, Xin Liu, Yanbo Li, Shibin Li

Research output: Contribution to journalArticlepeer-review

68 Scopus citations

Abstract

The fabrication of perovskite solar cells in ambient air is of significant economic benefit. However, to date, there is no satisfactory solution to achieve this, and the reported results of solar cells fabricated in ambient air vary significantly. It has been observed through studies of the "turbid point", a time point at which the appearance of the precursor film changes from transparent to turbid, that the crystallization of methylammonium lead iodide (MAPbI3) precursor films is strongly affected by humidity. A theoretical model based on the dependence of crystallization on evaporation was developed. We further designed a "humidity-insensitive antisolvent method" based on the turbid point and its tuning to control the fabrication of high-quality MAPbI3 films and solar cells irrespective of the ambient humidity levels. Note that a champion device prepared in ambient air at 90% RH exhibits the efficiency of 19.5%, which is highest among those of the devices prepared in ambient air with over 30% RH. Our study may also impact other perovskite devices and inspire other researchers to perform innovative experiments.

Original languageEnglish
Pages (from-to)12166-12175
Number of pages10
JournalJournal of Materials Chemistry A
Volume7
Issue number19
DOIs
StatePublished - 2019

Bibliographical note

Publisher Copyright:
© 2019 The Royal Society of Chemistry.

ASJC Scopus subject areas

  • General Chemistry
  • Renewable Energy, Sustainability and the Environment
  • General Materials Science

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