Air-stable n-doped colloidal HgS quantum dots

Kwang Seob Jeong, Zhiyou Deng, Sean Keuleyan, Heng Liu, Philippe Guyot-Sionnest

Research output: Contribution to journalArticle

70 Citations (Scopus)

Abstract

HgS nanocrystals show a strong mid-infrared absorption and a bleach of the near-infrared band edge, both tunable in energy and reversibly controlled by exposure to solution ions under ambient conditions. The same effects are obtained by applying a reducing electrochemical potential, confirming that the mid-infrared absorption is the intraband transition of the quantum dot. This is the first time that stable carriers are present in the quantum state of strongly confined quantum dot in ambient conditions. The mechanism by which doping is achieved is attributed to the rigid shifts of the valence and conduction band with respect to the environment, similar to the sensitivity of the work function of surfaces to adsorbates.

Original languageEnglish
Pages (from-to)1139-1143
Number of pages5
JournalJournal of Physical Chemistry Letters
Volume5
Issue number7
DOIs
Publication statusPublished - 2014 Apr 3
Externally publishedYes

Keywords

  • air-stable n-doped HgS colloidal quantum dots
  • photoluminescence of quantum dots in midwavelength infrared range
  • spectroelectrochemistry
  • steady-state intraband absorption
  • surface doping

ASJC Scopus subject areas

  • Materials Science(all)
  • Physical and Theoretical Chemistry

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