High-Speed Colloidal Quantum Dot Photodiodes via Accelerating Charge Separation at Metal–Oxide Interface

Shin Young Jeong, Jihoon Kyhm, Soon Kyu Cha, Do Kyung Hwang, Byeong Kwon Ju, Joon Suh Park, Seong Jun Kang, Il Ki Han

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

With ever-growing technological demands in the imaging sensor industry for autonomous driving and augmented reality, developing sensors that can satisfy not only image resolution but also the response speed becomes more challenging. Herein, the focus is on developing a high-speed photosensor capable of obtaining high-resolution, high-speed imaging with colloidal quantum dots (QDs) as the photosensitive material. In detail, high-speed QD photodiodes are demonstrated with rising and falling times of τ r = 28.8 ± 8.34 ns and τ f = 40 ± 9.81 ns, respectively, realized by fast separation of electron–hole pairs due to the action of internal electric field at the QD interface, mainly by the interaction between metal oxide and the QD's ligands. Such energy transfer relations are analyzed and interpreted with time-resolved photoluminescence measurements, providing physical understanding of the device and working principles.

Original languageEnglish
Article number1900008
JournalSmall
DOIs
Publication statusPublished - 2019 Jan 1

Keywords

  • colloidal quantum dots
  • high-speed photodetector
  • metal oxide
  • optical sensor
  • photodiodes

ASJC Scopus subject areas

  • Biotechnology
  • Biomaterials
  • Chemistry(all)
  • Materials Science(all)

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    Jeong, S. Y., Kyhm, J., Cha, S. K., Hwang, D. K., Ju, B. K., Park, J. S., Kang, S. J., & Han, I. K. (2019). High-Speed Colloidal Quantum Dot Photodiodes via Accelerating Charge Separation at Metal–Oxide Interface. Small, [1900008]. https://doi.org/10.1002/smll.201900008