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Proceedings Paper

Single molecule quantum-confined Stark effect measurements of semiconductor nanoparticles at room temperature
Author(s): Kyoung Won Park; Zvicka Deutsch; J. Jack Li; Dan Oron; Shimon Weiss
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Paper Abstract

We investigate the quantum confined Stark effect (QCSE) of various nanoparticles (NPs) on the single molecule level at room temperature. We tested 8 different NPs with different geometry, material composition and electronic structure, and measured their QCSE by single molecule spectroscopy. This study reveals that suppressing the Coulomb interaction force between electron and hole by asymmetric type-II interface is critical for an enhanced QCSE. For example, ZnSe-CdS and CdSe(Te)-CdS-CdZnSe asymmetric nanorods (type-II) display respectively twice and more than three times larger QCSE than that of simple type-I nanorods (CdSe). In addition, wavelength blue-shift of QCSE and roughly linear Δλ-F (emission wavelength shift vs. the applied electric field) relation are observed for the type-II nanorods. Experimental results (Δλ-F or ΔE-F) are successfully reproduced by self-consistent quantum mechanical calculation. Intensity reduction in blue-shifted spectrum is also accounted for. Both calculations and experiments suggest that the magnitude of the QCSE is predominantly determined by the degree of initial charge separation in these structures.

Paper Details

Date Published: 22 February 2013
PDF: 11 pages
Proc. SPIE 8595, Colloidal Nanocrystals for Biomedical Applications VIII, 859518 (22 February 2013);
Show Author Affiliations
Kyoung Won Park, Univ. of California, Los Angeles (United States)
Zvicka Deutsch, The Weizmann Institute (Israel)
J. Jack Li, Univ. of California, Los Angeles (United States)
Dan Oron, The Weizmann Institute (Israel)
Shimon Weiss, Univ. of California, Los Angeles (United States)

Published in SPIE Proceedings Vol. 8595:
Colloidal Nanocrystals for Biomedical Applications VIII
Wolfgang J. Parak; Marek Osinski; Kenji Yamamoto, Editor(s)

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