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

Journal Article · Fri Apr 06 00:00:00 EDT 2007 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.98.146803· OSTI ID:20951216

Lee, Jonathan R. I.; Meulenberg, Robert W; Klepeis, John E; Terminello, Louis J; Buuren, Tony van ^[1]; Hanif, Khalid M; Mattoussi, Hedi ^[2]

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1. Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)
2. Naval Research Laboratory, Washington D.C. 20375 (United States)

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.

• OSTI ID: 20951216
• Journal Information: Physical Review Letters, Vol. 98, Issue 14; Other Information: DOI: 10.1103/PhysRevLett.98.146803; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ABSORPTION SPECTROSCOPY
ANGULAR MOMENTUM
CADMIUM SELENIDES
CONFINEMENT
PARTICLE SIZE
QUANTUM DOTS
X-RAY SPECTROSCOPY