Enhanced Weak-Light Detection of Perovskite Photodetectors through Perovskite/Hole-Transport Material Interface Treatment

David Sunghwan Lee, Jin Hyuck Heo, Jin Kyoung Park, Bong Woo Kim, Hyong Joon Lee, Yun Mi Song, Sang Hyuk Im

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)


Enhancement in weak-light detection and other photodetection properties was observed for organic-inorganic halide perovskite photodetectors as a result of benzylammonium iodide (BzAI) treatment at the methylammonium lead triiodide (MAPbI3) and hole-transport layer (HTL) interface. After treatment, growth of the two-dimensional Ruddlesden-Popper perovskite phase was observed at the MAPbI3 surface, which shifted the overall surface work function upwards and thus effectively facilitated charge transfer across the MAPbI3/HTL interface. As a result, the fully fabricated device with 10 mg/mL (BzAI/isopropanol) treatment exhibited shorter rise time (trise) and decay time (tdecay) of 53 and 38 μs, respectively, compared to trise and tdecay of 214 and 120 μs, respectively, for the pristine MAPbI3 sample. In addition, the BzAI-treated device exhibited larger linearity compared to the pristine MAPbI3 sample, demonstrating a high and stable specific detectivity of 1.49 × 1013 to 2.14 × 1013 Jones under incident light intensity of 10-3 to 100 mW/cm2, respectively.

Original languageEnglish
Pages (from-to)16775-16783
Number of pages9
JournalACS Applied Materials and Interfaces
Issue number14
Publication statusPublished - 2021 Apr 14

Bibliographical note

Funding Information:
This study was supported by the National Research Foundation of Korea (NRF) under the Ministry of Science, ICT & Future Planning (Basic Science Research Program (No. 2021R1A5A6002853), Nano-Material Technology Development Program (No. 2017M3A7B4041696)), the Ministry of Trade, Industry & Energy, Republic of Korea (New & Renewable Energy Core Technology Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) (No. 20183010013820)), and the Ministry of Education (No. 2020R1I1A1A01061774).

Publisher Copyright:
© 2021 American Chemical Society.


  • Ruddlesden-Popper interfacial treatment
  • efficient charge transfer
  • low hysteresis
  • perovskite photodetector
  • weak-light detection
  • work function shift

ASJC Scopus subject areas

  • General Materials Science


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