Colloidal quantum dots intraband photodetectors

Zhiyou Deng, Kwang Seob Jeong, Philippe Guyot-Sionnest

Research output: Contribution to journalArticle

88 Citations (Scopus)

Abstract

Photoconductivity is demonstrated with monodispersed HgSe colloidal quantum dots that are illuminated with radiation resonant with 1Se-1Pe intraband electronic absorption, between 3 and 5 μm. A doping of two electrons per dot gives the lowest dark current, and a detectivity of 8.5 x 108 Jones is obtained at 80 K. Photoluminescence of the intraband transition is also observed. The detector properties are discussed in terms of the measured photoluminescence quantum yield, the electron mobility in the 1Pe state, and the responsivity. The intraband photoresponse allows to fully harness the quantum confined states in colloidal nanostructures, extending the prior limited use of interband transition.

Original languageEnglish
Pages (from-to)11707-11714
Number of pages8
JournalACS Nano
Volume8
Issue number11
DOIs
Publication statusPublished - 2014 Nov 25
Externally publishedYes

Keywords

  • Colloidal quantum dots
  • Infrared photodetector
  • Intraband absorption
  • Intraband photoconductivity
  • Mercury selenide

ASJC Scopus subject areas

  • Engineering(all)
  • Materials Science(all)
  • Physics and Astronomy(all)

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