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Title: Experimental Observation of Quantum Confinement in the Conduction Band of CdSe Quantum Dots

Abstract

X-ray absorption spectroscopy has been used to characterize the evolution in the conduction band (CB) density of states of CdSe quantum dots (QDs) as a function of particle size. We have unambiguously witnessed the CdSe QD CB minimum (CBM) shift to higher energy with decreasing particle size, consistent with quantum confinement effects, and have directly compared our results with recent theoretical calculations. At the smallest particle size, evidence for a pinning of the CBM is presented. Our observations can be explained by considering a size-dependent change in the angular-momentum-resolved states at the CBM.

Authors:
; ; ; ;  [1]; ;  [2]
  1. Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)
  2. Naval Research Laboratory, Washington D.C. 20375 (United States)
Publication Date:
OSTI Identifier:
20951216
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review Letters; Journal Volume: 98; Journal Issue: 14; Other Information: DOI: 10.1103/PhysRevLett.98.146803; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ABSORPTION SPECTROSCOPY; ANGULAR MOMENTUM; CADMIUM SELENIDES; CONFINEMENT; PARTICLE SIZE; QUANTUM DOTS; X-RAY SPECTROSCOPY

Citation Formats

Lee, Jonathan R. I., Meulenberg, Robert W., Klepeis, John E., Terminello, Louis J., Buuren, Tony van, Hanif, Khalid M., and Mattoussi, Hedi. Experimental Observation of Quantum Confinement in the Conduction Band of CdSe Quantum Dots. United States: N. p., 2007. Web. doi:10.1103/PHYSREVLETT.98.146803.
Lee, Jonathan R. I., Meulenberg, Robert W., Klepeis, John E., Terminello, Louis J., Buuren, Tony van, Hanif, Khalid M., & Mattoussi, Hedi. Experimental Observation of Quantum Confinement in the Conduction Band of CdSe Quantum Dots. United States. doi:10.1103/PHYSREVLETT.98.146803.
Lee, Jonathan R. I., Meulenberg, Robert W., Klepeis, John E., Terminello, Louis J., Buuren, Tony van, Hanif, Khalid M., and Mattoussi, Hedi. Fri . "Experimental Observation of Quantum Confinement in the Conduction Band of CdSe Quantum Dots". United States. doi:10.1103/PHYSREVLETT.98.146803.
@article{osti_20951216,
title = {Experimental Observation of Quantum Confinement in the Conduction Band of CdSe Quantum Dots},
author = {Lee, Jonathan R. I. and Meulenberg, Robert W. and Klepeis, John E. and Terminello, Louis J. and Buuren, Tony van and Hanif, Khalid M. and Mattoussi, Hedi},
abstractNote = {X-ray absorption spectroscopy has been used to characterize the evolution in the conduction band (CB) density of states of CdSe quantum dots (QDs) as a function of particle size. We have unambiguously witnessed the CdSe QD CB minimum (CBM) shift to higher energy with decreasing particle size, consistent with quantum confinement effects, and have directly compared our results with recent theoretical calculations. At the smallest particle size, evidence for a pinning of the CBM is presented. Our observations can be explained by considering a size-dependent change in the angular-momentum-resolved states at the CBM.},
doi = {10.1103/PHYSREVLETT.98.146803},
journal = {Physical Review Letters},
number = 14,
volume = 98,
place = {United States},
year = {Fri Apr 06 00:00:00 EDT 2007},
month = {Fri Apr 06 00:00:00 EDT 2007}
}