Volume 65, Number 6, March 2004
|Page(s)||809 - 815|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 March 2004|
Evolution of the density of states on going from a two- to a zero-dimensional semiconductor
Physical Chemistry Laboratory, Ghent University Krijgslaan 281-S12, B-9000 Gent, Belgium
2 IEMN (CNRS, UMR 8520), Département ISEN 41 bd Vauban, 59046, Lille Cédex, France
3 Debye Institute, Utrecht University P.O. Box 80000, 3508 TA Utrecht, The Netherlands
Accepted: 22 January 2004
Lead selenide nanocrystals have been electrodeposited on gold(111) with a high degree of control over their dimensions, giving rise to isolated nanocrystals with different edge-to-height aspect ratio. The electron density of states (DOS) of individual nanocrystals as a function of their aspect ratio is studied in the regime of strong quantum confinement by electron tunnelling spectroscopy. We find a broad transition regime, spanning the two- and zero-dimensional geometry, where the DOS function has a rich and variable structure, featuring steps and peaks. The experimental results are supported by electronic-structure calculations.
PACS: 73.22.-f – Electronic structure of nanoscale materials: clusters, nanoparticles, nanotubes, and nanocrystals / 73.63.Hs – Quantum wells / 73.63.Kv – Quantum dots
© EDP Sciences, 2004
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