Blinking suppression of CdTe quantum dots on epitaxial graphene and the analysis with Marcus electron transfer

Blinking suppression of CdTe quantum dots on epitaxial graphene and the analysis with Marcus electron transfer

We have prepared epitaxial graphene by a Si sublimation method from 4H-SiC. Single-particle spectroscopy of CdTe quantum dots (QDs) on epitaxial graphene covered with polyvinylpyrrolidone (PVP) or polyethylene glycol (PEG) showed the suppression of luminescence blinking and ∼10 times decreased lumin...

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Veröffentlicht in:Applied physics letters 2014-08, Vol.105 (8)
Hauptverfasser: Hirose, Takuya, Kutsuma, Yasunori, Kurita, Atsusi, Kaneko, Tadaaki, Tamai, Naoto
Format: Artikel
Sprache:eng
Schlagworte:
Applied physics
Blinking
CADMIUM TELLURIDES
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
COUPLING CONSTANTS
DISTRIBUTION
ELECTRON TRANSFER
Electrons
EPITAXY
GLASS
GRAPHENE
LUMINESCENCE
Polyethylene glycol
POLYETHYLENE GLYCOLS
Polyvinylpyrrolidone
PVP
QUANTUM DOTS
Silicon carbide
SILICON CARBIDES
SPECTROSCOPY
SUBLIMATION
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Zusammenfassung:We have prepared epitaxial graphene by a Si sublimation method from 4H-SiC. Single-particle spectroscopy of CdTe quantum dots (QDs) on epitaxial graphene covered with polyvinylpyrrolidone (PVP) or polyethylene glycol (PEG) showed the suppression of luminescence blinking and ∼10 times decreased luminescence intensity as compared with those on a glass. The electronic coupling constant, H01, between CdTe QDs and graphene was calculated to be (3.3 ± 0.4) × 102 cm−1 in PVP and (3.7 ± 0.8) × 102 cm−1 in PEG based on Marcus theory of electron transfer and Tang-Marcus model of blinking with statistical distribution.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4893667