Gas-assisted preparation of lead iodide perovskite films consisting of a monolayer of single crystalline grains for high efficiency planar solar cells

Fuzhi Huang, Yasmina Dkhissi, Wenchao Huang, Manda Xiao, Iacopo Benesperi, Sergey Rubanov, Ye Zhu, Xiongfeng Lin, Liangcong Jiang, Yecheng Zhou, Angus Gray-Weale, Joanne Etheridge, Christopher R. McNeill, Rachel A. Caruso, Udo Bach, Leone Spiccia, Yi Bing Cheng

Research output: Journal article publicationJournal articleAcademic researchpeer-review

449 Citations (Scopus)


The simple planar configuration of organic-inorganic hybrid perovskite solar cells produced by a solution coating process has great potential to be a low-cost and high efficiency photovoltaic technology. However planar perovskite films produced by "normal" spin coating usually show a dendritic grain morphology giving many gaps in the film, resulting in poor coverage of the substrate and thus a low power conversion efficiency. Here a facile gas-assisted solution processing technique is reported that has changed the kinetics of nucleation and crystal growth of the perovskite during the spin coating, producing very uniform perovskite thin films consisting of densely packed single crystalline grains. This microstructure is an ideal candidate for the p-. i-. n solar cell device. Planar perovskite solar cells constructed from these films produced a highly reproducible average power conversion efficiency of 15.7±0.7%. The highest efficiency achieved was 17.0% with a slightly lower steady-state value of 16.5% at the maximum power output of the solar cell.
Original languageEnglish
Pages (from-to)10-18
Number of pages9
JournalNano Energy
Publication statusPublished - 1 Nov 2014
Externally publishedYes


  • Gas-assisted crystallization
  • Lead iodide perovskite
  • Microstructural analysis
  • Planar thin film solar cells
  • Single crystal grains

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)
  • Electrical and Electronic Engineering

Cite this