Single molecule quantum-confined Stark effect measurements of semiconductor nanoparticles at room temperature

Kyoung Won Park; Zvicka Deutsch; J. Jack Li; Dan Oron; Shimon Weiss

doi:10.1117/12.2001566

22 February 2013 Single molecule quantum-confined Stark effect measurements of semiconductor nanoparticles at room temperature

Kyoung Won Park, Zvicka Deutsch, J. Jack Li, Dan Oron, Shimon Weiss

Author Affiliations +

Proceedings Volume 8595, Colloidal Nanocrystals for Biomedical Applications VIII; 859518 (2013) https://doi.org/10.1117/12.2001566
Event: SPIE BiOS, 2013, San Francisco, California, United States

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.

Citation Download Citation

Kyoung Won Park, Zvicka Deutsch, J. Jack Li, Dan Oron, and Shimon Weiss "Single molecule quantum-confined Stark effect measurements of semiconductor nanoparticles at room temperature", Proc. SPIE 8595, Colloidal Nanocrystals for Biomedical Applications VIII, 859518 (22 February 2013); https://doi.org/10.1117/12.2001566

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