Room Temperature Formation of Semiconductor Grade α-FAPbI3 Films for Efficient Perovskite Solar Cells

Zhiliang Chen, Hengkai Zhang, Fang Yao, Chen Tao, Guojia Fang, Gang Li

Research output: Journal article publicationJournal articleAcademic researchpeer-review

24 Citations (Scopus)


Formamidinium lead iodide (FAPbI3) perovskite is a front-runner material for efficient perovskite solar cells (PSCs) due to its high light-absorption coefficient, narrow band gap, and superior photostability and thermostability. High-quality FAPbI3 perovskite formation typically requires an >160°C annealing process to induce phase transition from the photoinactive yellow phase (δ-FAPbI3) to the photoactive black phase (α-FAPbI3). However, this high-temperature annealing can induce defects in the films and hinders application in flexible solar cells. Here, we report a facile method to fabricate high-quality α-FAPbI3 perovskite films at room temperature, without thermal annealing or vacuum-assisted processes. Combined computational and experimental results reveal the crystallization mechanism of α-FAPbI3 formation at room temperature. We demonstrate PSCs with a power-conversion efficiency of 19.09%, which is the highest efficiency for room temperature PSCs to the best of our knowledge. This study may offer a cost-effective way to fabricate highly efficient PSCs at room temperature. α-FAPbI3 is a front-runner perovskite material for highly efficient solar cells, although its preparation typically requires high-temperature annealing. Chen et al. report a facile method for fabricating high-quality α-FAPbI3 films at room temperature and reveal the mechanism of the formation of α-FAPbI3 through theoretical and experimental methods.

Original languageEnglish
Article number100205
JournalCell Reports Physical Science
Issue number9
Publication statusPublished - 23 Sept 2020


  • formamidinium lead iodide
  • Intermediate Phase
  • low bandgap
  • perovskite solar cell
  • Room Temperature Perovskite Formation
  • α-FAPbI

ASJC Scopus subject areas

  • General Physics and Astronomy
  • General Materials Science
  • General Chemistry
  • General Energy
  • General Engineering


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