Ultra-Low Noise Level Infrared Quantum Dot Photodiodes with Self-Screenable Polymeric Optical Window

Tae Hyuk Kim, Young Kyun Choi, Gyeong Min Lee, Muhammad Ahsan Saeed, Byung Ku Jung, Min Jong Lee, Hyung Jin Choi, Soong Ju Oh, Jae Won Shim

Research output: Contribution to journalArticlepeer-review

Abstract

Quantum dot photodiodes (QPDs) have garnered significant attention because of their unparalleled near-infrared (NIR) detection capabilities, primarily attributable to their size-dependent bandgap tunability. Nevertheless, the broadband absorption spectrum of QPD engenders substantial noise floor within superfluous visible light regions, notably hindering their use in several emerging applications necessitating the detection of faint micro-light signals. To overcome these hurdles, a self-screenable NIR QPD featuring an internal optical filter with a thick polymeric interlayer to reduce electronic noise is demonstrated. This effectively screens out undesirable visible light regions while reducing the ionized defect owing to decreased density of state, yielding an extremely low dark current (≈1010 A cm−2 at V = −1 V). Consequently, the electronic noise spectral density is attained at levels below ≈10−27–10−28 A2 Hz−1, and responsivity (R) dropped to 92% within the visible light spectrum.

Original languageEnglish
Article number2309028
JournalAdvanced Materials
Volume36
Issue number4
DOIs
Publication statusPublished - 2024 Jan 25

Bibliographical note

Publisher Copyright:
© 2023 Wiley-VCH GmbH.

Keywords

  • quantum dot photodiode
  • selective near-infrared detection
  • self-screenable optical window
  • suppressed electronic noise levels
  • thick organic blocking layer

ASJC Scopus subject areas

  • General Materials Science
  • Mechanics of Materials
  • Mechanical Engineering

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