Swart, Ingmar and Sun, Zhixiang and Vanmaekelbergh, Daniel and Liljeroth, Peter (2010) Hole-Induced Electron Transport through Core-Shell Quantum Dots: A Direct Measurement of the Electron-Hole Interaction. NANO LETTERS, 10 (5). pp. 1931-1935. ISSN 1530-6984,
Full text not available from this repository. (Request a copy)Abstract
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.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | SCANNING TUNNELING SPECTROSCOPY; SEMICONDUCTOR NANOCRYSTALS; MONODISPERSE NANOCRYSTALS; PBSE; HETEROSTRUCTURES; NANORODS; EXCHANGE; EMISSION; STATES; Core-shell quantum dots; scanning tunneling microscopy; scanning tunneling spectroscopy; single-electron tunneling; electron-hole interaction; ambipolar electron transport |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 03 Aug 2020 05:14 |
| Last Modified: | 03 Aug 2020 05:14 |
| URI: | https://pred.uni-regensburg.de/id/eprint/24792 |
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