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

65 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

Fingerprint

Quantum Dots
Infrared absorption
Semiconductor quantum dots
Air
Adsorbates
Valence bands
Conduction bands
Nanoparticles
Nanocrystals
Doping (additives)
Ions
Infrared radiation

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)

Cite this

Jeong, K. S., Deng, Z., Keuleyan, S., Liu, H., & Guyot-Sionnest, P. (2014). Air-stable n-doped colloidal HgS quantum dots. Journal of Physical Chemistry Letters, 5(7), 1139-1143. https://doi.org/10.1021/jz500436x

Air-stable n-doped colloidal HgS quantum dots. / Jeong, Kwang Seob; Deng, Zhiyou; Keuleyan, Sean; Liu, Heng; Guyot-Sionnest, Philippe.

In: Journal of Physical Chemistry Letters, Vol. 5, No. 7, 03.04.2014, p. 1139-1143.

Research output: Contribution to journalArticle

Jeong, KS, Deng, Z, Keuleyan, S, Liu, H & Guyot-Sionnest, P 2014, 'Air-stable n-doped colloidal HgS quantum dots', Journal of Physical Chemistry Letters, vol. 5, no. 7, pp. 1139-1143. https://doi.org/10.1021/jz500436x
Jeong, Kwang Seob ; Deng, Zhiyou ; Keuleyan, Sean ; Liu, Heng ; Guyot-Sionnest, Philippe. / Air-stable n-doped colloidal HgS quantum dots. In: Journal of Physical Chemistry Letters. 2014 ; Vol. 5, No. 7. pp. 1139-1143.
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