Optical properties of germanium nanocrystals

Citation
M. Palummo et al., Optical properties of germanium nanocrystals, PHYS ST S-A, 175(1), 1999, pp. 23-31
Citations number
16
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
PHYSICA STATUS SOLIDI A-APPLIED RESEARCH
ISSN journal
00318965 → ACNP
Volume
175
Issue
1
Year of publication
1999
Pages
23 - 31
Database
ISI
SICI code
0031-8965(19990916)175:1<23:OPOGN>2.0.ZU;2-A
Abstract
We study the electronic structure and the optical properties of germanium c lusters up to about 10(3) atoms, by using a semi-empirical tight-binding ap proach. Germanium nanocrystals are related to quantum dots growing, by a se lf-organization process, in sapphire matrices. The optical properties of su ch dots are experimentally found to be strongly influenced by quantum confi nement effects.. We investigate these effects from the theoretical point of view, calculating the optical spectra in the single-particle approximation . Inclusion of the electron-hole interaction is found to yield visible effe cts.