Fast and Highly Sensitive Photodetectors Based on Pb-Free Sn-Based Perovskite with Additive Engineering

Kwang Ro Yun, Tae Ju Lee, Su Kyung Kim, Jong Ho Kim, Tae Yeon Seong

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


Organic–inorganic halide perovskites have been widely investigated for the fabrication of photodetectors because of their excellent optoelectronic properties. However, the toxicity of Pb-based perovskites and the lack of manufacturing technology in air limits the commercialization of perovskite-based photodetectors. Tin halide perovskite (THP) is a promising candidate to replace Pb-based perovskites due to its low toxicity and potential commercialization. However, THP suffers poor stability in air because Sn2+ is easily oxidized to Sn4+. This “self-doping” effect not only degrades device performance rapidly, but also makes it difficult to fabricate THP-based devices in air. Here, Pb-free Sn-based 2D perovskite PEA2SnI4 films with tin fluoride (SnF2) additive are prepared in air using a nitrogen quenching hot casting method. The photodetectors with an optimal SnF2 concentration of 20% exhibit a fast response speed of 0.56 ms and an excellent specific detectivity of 6.32 × 1013 Jones, the best combination of THP-based photodetectors reported hitherto. The SnF2 additive is found to suppress the formation of Sn vacancies and improve the crystallinity of PEA2SnI4 films. The work provides an air-processing technology of Pb-free perovskite, which is easy to commercialize, and SnF2 additive engineering offering an effective way to demonstrate high performance photodetectors and image recognition applications.

Original languageEnglish
Article number2201974
JournalAdvanced Optical Materials
Issue number1
Publication statusPublished - 2023 Jan 4

Bibliographical note

Funding Information:
This work was supported by the National Research Foundation (NRF) of Korea funded by the Ministry of Science and ICT under Grant Nos. NRF‐2017K1A1A2013160 and NRF‐2022R1A2C2006887.

Publisher Copyright:
© 2022 The Authors. Advanced Optical Materials published by Wiley-VCH GmbH.


  • 2D perovskites
  • Pb-free perovskites
  • air-processing
  • photodetectors
  • tin fluoride additive

ASJC Scopus subject areas

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


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