Highly Efficient and Stable Inverted Perovskite Solar Cell Using Pure δ-FAPbI3 Single Crystals

Tarak Nath Mandal, Jin Hyuck Heo, Sang Hyuk Im, Woo Sik Kim

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


Pure δ-formamidinium lead triiodide (δ-FAPbI3) single crystal for highly efficient perovskite solar cell (PCS) with long-term stability is prepared by a new method consisting of liquid phase reaction of FAI and PbI2 in N,N-dimethyl formamide and antisolvent crystallization using acetonitrile. In this method, the incorporation of any impurity into the crystal is excluded by the molecular recognition of the crystal growth site. This pure crystal is used to fabricate α-FAPbI3 inverted PSCs which showed excellent power conversion efficiency (PCE) due to much-reduced trap-states. The champion device exhibited a high PCE of 23.48% under the 1-Sun condition. Surface-treated devices with 3-(aminomethyl)pyridine showed a significantly improved PCE of 25.07%. In addition, the unencapsulated device maintained 97.22% of its initial efficiency under continuous 1-Sun illumination for 1,000 h at 85 °C in an N2 atmosphere ensuring long-term thermal and photo stabilities of PSCs, whereas the control device kept only 89.93%.

Original languageEnglish
Article number2305246
Issue number52
Publication statusPublished - 2023 Dec 27

Bibliographical note

Publisher Copyright:
© 2023 Wiley-VCH GmbH.


  • antisolvent crystallization
  • high efficiency
  • long-term stability
  • perovskite solar cells
  • pure δ-FAPbI crystals
  • reduction of trap-state

ASJC Scopus subject areas

  • Biotechnology
  • General Chemistry
  • Biomaterials
  • General Materials Science
  • Engineering (miscellaneous)


Dive into the research topics of 'Highly Efficient and Stable Inverted Perovskite Solar Cell Using Pure δ-FAPbI3 Single Crystals'. Together they form a unique fingerprint.

Cite this