Fabrication of [001]-Oriented FAPbI3-Based Photodetector With Excellent Air Stability Via Green Anti-Solvent Additive Engineering

Kwang Ro Yun, Se Jin Kim, Tae Yeon Seong

Research output: Contribution to journalArticlepeer-review


Formamidinium lead triiodide (FAPbI3) exhibits excellent thermal and chemical stability, making it a suitable alternative for methylammonium lead triiodide (MAPbI3) in high-performance photodetectors. However, FAPbI3 faces the challenge of transforming from the metastable photoactive black phase α-FAPbI3 to the photoinactive yellow phase δ-FAPbI3 at room temperature. This phase transition is accelerated in humid atmospheric conditions. To realize high-performance FAPbI3-based photodetectors, it is crucial to form stable and highly crystalline phase-pure α-FAPbI3 films. Herein, is fabricate highly stable and crystalline FAPbI3 films and photodetectors through anti-solvent additive engineering (AAE) using a green anti-solvent (isopropanol, IPA) and an organic spacer (phenethylammonium iodide, PEAI). It is found that PEAI-AAE treatment induced [001]-preferred orientation growth in FAPbI3 films, and passivated defects within the crystal. The photodetectors based on PEAI-AAE-treated FAPbI3 film exhibits a fast response time of 485 µs/525 µs (rise time/fall time), high responsivity of 24.89 A W−1, and excellent specific detectivity of 1.56 × 1013 Jones. Moreover, the PEAI-AAE-treated FAPbI3 photodetector retained over 80% of its initial performance even after exposure to ambient air for over 720 h, demonstrating excellent long-term stability. This study provides a green processing method that paves the way for future commercialization of perovskite-based optoelectronic devices.

Original languageEnglish
JournalAdvanced Optical Materials
Publication statusAccepted/In press - 2024

Bibliographical note

Publisher Copyright:
© 2024 Wiley-VCH GmbH.


  • additive
  • anti-solvent
  • facet
  • orientation
  • perovskite
  • photodetector
  • stability

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics


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