Photoluminescence from Si nanocrystals embedded in SiO2 matrices in a weakconfinement regime

Authors
Takeoka, S Fujii, M Hayashi, S
Citation
S. Takeoka et al., Photoluminescence from Si nanocrystals embedded in SiO2 matrices in a weakconfinement regime, PHYS ST S-B, 224(1), 2001, pp. 229-232
Citations number
11
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
PHYSICA STATUS SOLIDI B-BASIC RESEARCH
ISSN journal
03701972 → ACNP
Volume
224
Issue
1
Year of publication
2001
Pages
229 - 232
Database
ISI
SICI code
0370-1972(200103)224:1<229:PFSNEI>2.0.ZU;2-N
Abstract
We have studied photoluminescence (PL) from surface-oxidized Si nanocrystal s (nc-Si) as a function of the size (4.2-9.0 nm in diameter). As the size d ecreased. a high-energy shift of the PL peak from the vicinity of the bulk band gap to the visible region was observed for the first time. This PL shi ft was accompanied by the shortening of the PL lifetime and the increase in the exchange splitting energy of excitons.