Structure of Excited-State Transitions of Individual Semiconductor Nanocrystals Probed by Photoluminescence Excitation Spectroscopy

Han Htoon, Paris J. Cox, and Victor I. Klimov
Phys. Rev. Lett. 93, 187402 – Published 28 October 2004

Abstract

We perform for the first time photoluminescence excitation (PLE) studies of individual nanocrystals (NCs) that reveal the structure of excited-state transitions not obscured by ensemble averaging. Single-NC PLE spectra strongly deviate from a traditional idealized picture of sharp, quasiatomic resonances. We detect only a few relatively narrow transitions (3–4 meV) at the band edge, while at higher spectral energies, we observe a broad structureless feature separated from the band-edge peaks by a >50meV “minigap.” These observations can be rationalized by analyzing hole intraband relaxation behavior.

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  • Received 22 April 2004

DOI:https://doi.org/10.1103/PhysRevLett.93.187402

©2004 American Physical Society

Authors & Affiliations

Han Htoon, Paris J. Cox, and Victor I. Klimov*

  • Chemistry Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA

  • *To whom correspondence should be addressed. Electronic addresses: klimov@lanl.gov http://quantumdot.lanl.gov

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Vol. 93, Iss. 18 — 29 October 2004

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