Experimental observation of quantum confinement in the conduction band of CdSe quantum dots

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, consis...

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Veröffentlicht in:	Physical review letters 2007-04, Vol.98 (14), p.146803-146803, Article 146803
Hauptverfasser:	Lee, Jonathan R I, Meulenberg, Robert W, Hanif, Khalid M, Mattoussi, Hedi, Klepeis, John E, Terminello, Louis J, van Buuren, Tony
Format:	Artikel
Sprache:	eng
Schlagworte:	ABSORPTION SPECTROSCOPY ANGULAR MOMENTUM CADMIUM SELENIDES CONFINEMENT MATERIALS SCIENCE PARTICLE SIZE QUANTUM DOTS X-RAY SPECTROSCOPY
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container_issue	14
container_start_page	146803
container_title	Physical review letters
container_volume	98
creator	Lee, Jonathan R I Meulenberg, Robert W Hanif, Khalid M Mattoussi, Hedi Klepeis, John E Terminello, Louis J van Buuren, Tony
description	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_str_mv	10.1103/PhysRevLett.98.146803
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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.</abstract><cop>United States</cop><pmid>17501301</pmid><doi>10.1103/PhysRevLett.98.146803</doi><tpages>1</tpages><oa>free_for_read</oa></addata></record>
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subjects	ABSORPTION SPECTROSCOPY ANGULAR MOMENTUM CADMIUM SELENIDES CONFINEMENT MATERIALS SCIENCE PARTICLE SIZE QUANTUM DOTS X-RAY SPECTROSCOPY
title	Experimental observation of quantum confinement in the conduction band of CdSe quantum dots
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