Colloidal quantum dots intraband photodetectors

Zhiyou Deng; Kwang Seob Jeong; Philippe Guyot-Sionnest

doi:10.1021/nn505092a

Colloidal quantum dots intraband photodetectors

Zhiyou Deng, Kwang Seob Jeong, Philippe Guyot-Sionnest

Research output: Contribution to journal › Article › peer-review

139 Citations (Scopus)

Abstract

Photoconductivity is demonstrated with monodispersed HgSe colloidal quantum dots that are illuminated with radiation resonant with 1S_e-1P_e 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 1P_e 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 language	English
Pages (from-to)	11707-11714
Number of pages	8
Journal	ACS Nano
Volume	8
Issue number	11
DOIs	https://doi.org/10.1021/nn505092a
Publication status	Published - 2014 Nov 25
Externally published	Yes

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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10.1021/nn505092a

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title = "Colloidal quantum dots intraband photodetectors",

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.",

keywords = "Colloidal quantum dots, Infrared photodetector, Intraband absorption, Intraband photoconductivity, Mercury selenide",

author = "Zhiyou Deng and Jeong, {Kwang Seob} and Philippe Guyot-Sionnest",

year = "2014",

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doi = "10.1021/nn505092a",

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T1 - Colloidal quantum dots intraband photodetectors

AU - Deng, Zhiyou

AU - Jeong, Kwang Seob

AU - Guyot-Sionnest, Philippe

PY - 2014/11/25

Y1 - 2014/11/25

N2 - 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.

AB - 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.

KW - Colloidal quantum dots

KW - Infrared photodetector

KW - Intraband absorption

KW - Intraband photoconductivity

KW - Mercury selenide

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Colloidal quantum dots intraband photodetectors

Abstract

Keywords

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