Journal
NANO LETTERS
Volume 10, Issue 5, Pages 1931-1935Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl100949a
Keywords
Core-shell quantum dots; scanning tunneling microscopy; scanning tunneling spectroscopy; single-electron tunneling; electron-hole interaction; ambipolar electron transport
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Funding
- EU
- NWO [700.56.423, 680.50.0907]
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Quantum dots (QDs) have promising optoelectronic properties. Colloidal QD heterostructures, systems in which two semiconductors are incorporated in a single colloid, may show novel and potentially useful transport phenomena. Here, we report on the physical mechanisms of charge transport through PbSe-CdSe core shell QDs measured with cryogenic scanning tunneling spectroscopy. Compared to single-component QDs, an additional hole-induced electron tunneling channel is found. Electron tunneling with and without a hole occurs at different bias, allowing the determination of the electron hole interaction energy (80 meV). This energy is sufficiently large to allow for a transport regime at room temperature in which electrons tunnel into the dot only if a hole is present, an ideal situation for controlled single-photon emission.
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