High-Performance Self-Powered Quantum Dot Infrared Photodetector with Azide Ion Solution Treated Electron Transport Layer

Young Kyun Choi, Tae Hyuk Kim, Byung Ku Jung, Taesung Park, Yong Min Lee, Seongkeun Oh, Hyung Jin Choi, Junhyeok Park, Sang In Bae, Yun Ki Lee, Jae Won Shim, Hye Yeon Park, Soong Ju Oh

Research output: Contribution to journalArticlepeer-review


The demand for self-powered photodetectors (PDs) capable of NIR detection without external power is growing with the advancement of NIR technologies such as LIDAR and object recognition. Lead sulfide quantum dot-based photodetectors (PbS QPDs) excel in NIR detection; however, their self-powered operation is hindered by carrier traps induced by surface defects and unfavorable band alignment in the zinc oxide nanoparticle (ZnO NP) electron-transport layer (ETL). In this study, an effective azide-ion (N3) treatment is introduced on a ZnO NP ETL to reduce the number of traps and improve the band alignment in a PbS QPD. The ZnO NP ETL treated with azide ions exhibited notable improvements in carrier lifetime and mobility as well as an enhanced internal electric field within the thin-film heterojunction of the ZnO NPs and PbS QDs. The azide-ion-treated PbS QPD demonstrated a increase in short-circuit current density upon NIR illumination, marking a responsivity of 0.45 A W−1, specific detectivity of 4 × 1011 Jones at 950 nm, response time of 8.2 µs, and linear dynamic range of 112 dB.

Original languageEnglish
Article number2308375
Issue number18
Publication statusPublished - 2024 May 2

Bibliographical note

Publisher Copyright:
© 2023 Wiley-VCH GmbH.


  • infrared photodetector
  • photodiode
  • quantum dot
  • self-powered device
  • surface chemistry

ASJC Scopus subject areas

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


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