Electronic impurity doping in CdSe nanocrystals

Ayaskanta Sahu; Moon Sung Kang; Alexander Kompch; Christian Notthoff; Andrew W. Wills; Donna Deng; Markus Winterer; C. Daniel Frisbie; David J. Norris

doi:10.1021/nl300880g

Electronic impurity doping in CdSe nanocrystals

Ayaskanta Sahu, Moon Sung Kang, Alexander Kompch, Christian Notthoff, Andrew W. Wills, Donna Deng, Markus Winterer, C. Daniel Frisbie, David J. Norris

Chemical and Biomolecular Engineering

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

Abstract

We dope CdSe nanocrystals with Ag impurities and investigate their optical and electrical properties. Doping leads not only to dramatic changes but surprising complexity. The addition of just a few Ag atoms per nanocrystal causes a large enhancement in the fluorescence, reaching efficiencies comparable to core-shell nanocrystals. While Ag was expected to be a substitutional acceptor, nonmonotonic trends in the fluorescence and Fermi level suggest that Ag changes from an interstitial (n-type) to a substitutional (p-type) impurity with increased doping.

Original language	English (US)
Pages (from-to)	2587-2594
Number of pages	8
Journal	Nano Letters
Volume	12
Issue number	5
DOIs	https://doi.org/10.1021/nl300880g
State	Published - May 9 2012

Keywords

Semiconductor nanocrystals
cation exchange
colloidal quantum dots
photoluminescence enhancement
silver doping
thin-film transistors

ASJC Scopus subject areas

Bioengineering
General Chemistry
General Materials Science
Condensed Matter Physics
Mechanical Engineering

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10.1021/nl300880g

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abstract = "We dope CdSe nanocrystals with Ag impurities and investigate their optical and electrical properties. Doping leads not only to dramatic changes but surprising complexity. The addition of just a few Ag atoms per nanocrystal causes a large enhancement in the fluorescence, reaching efficiencies comparable to core-shell nanocrystals. While Ag was expected to be a substitutional acceptor, nonmonotonic trends in the fluorescence and Fermi level suggest that Ag changes from an interstitial (n-type) to a substitutional (p-type) impurity with increased doping.",

keywords = "Semiconductor nanocrystals, cation exchange, colloidal quantum dots, photoluminescence enhancement, silver doping, thin-film transistors",

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language = "English (US)",

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T1 - Electronic impurity doping in CdSe nanocrystals

AU - Sahu, Ayaskanta

AU - Kang, Moon Sung

AU - Kompch, Alexander

AU - Notthoff, Christian

AU - Wills, Andrew W.

AU - Deng, Donna

AU - Winterer, Markus

AU - Frisbie, C. Daniel

AU - Norris, David J.

PY - 2012/5/9

Y1 - 2012/5/9

N2 - We dope CdSe nanocrystals with Ag impurities and investigate their optical and electrical properties. Doping leads not only to dramatic changes but surprising complexity. The addition of just a few Ag atoms per nanocrystal causes a large enhancement in the fluorescence, reaching efficiencies comparable to core-shell nanocrystals. While Ag was expected to be a substitutional acceptor, nonmonotonic trends in the fluorescence and Fermi level suggest that Ag changes from an interstitial (n-type) to a substitutional (p-type) impurity with increased doping.

AB - We dope CdSe nanocrystals with Ag impurities and investigate their optical and electrical properties. Doping leads not only to dramatic changes but surprising complexity. The addition of just a few Ag atoms per nanocrystal causes a large enhancement in the fluorescence, reaching efficiencies comparable to core-shell nanocrystals. While Ag was expected to be a substitutional acceptor, nonmonotonic trends in the fluorescence and Fermi level suggest that Ag changes from an interstitial (n-type) to a substitutional (p-type) impurity with increased doping.

KW - Semiconductor nanocrystals

KW - cation exchange

KW - colloidal quantum dots

KW - photoluminescence enhancement

KW - silver doping

KW - thin-film transistors

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DO - 10.1021/nl300880g

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JO - Nano Letters

JF - Nano Letters

IS - 5

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Electronic impurity doping in CdSe nanocrystals

Abstract

Keywords

ASJC Scopus subject areas

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