Number of the records: 1

Femtosecond luminescence spectroscopy of core states in silicon nanocrystals

SYSNO ASEP	0356926
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Článek ve WOS
Title	Femtosecond luminescence spectroscopy of core states in silicon nanocrystals
Author(s)	Žídek, K. (CZ) Trojánek, F. (CZ) Malý, P. (CZ) Ondič, Lukáš (FZU-D)_{RID, ORCID} Pelant, Ivan (FZU-D)_{RID, ORCID, SAI} Dohnalová, Kateřina (FZU-D)_{RID, ORCID} Šiller, L. (GB) Little, R. (GB) Horrocks, B.R. (GB)
Source Title	Optics Express. - : Optical Society of America - ISSN 1094-4087 Roč. 18, č. 24 (2010), s. 25241-25249
Number of pages	9 s.
Language	eng - English
Country	US - United States
Keywords	silicon nanocrystals ; ultrafast spectroscopy ; photoluminescence spectroscopy
Subject RIV	BM - Solid Matter Physics ; Magnetism
R&D Projects	KAN400100701 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR)
	IAA101120804 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR)
	LC510 GA MŠMT - Ministry of Education, Youth and Sports (MEYS)
CEZ	AV0Z10100521 - FZU-D (2005-2011)
UT WOS	000285586800097
DOI	10.1364/OE.18.025241
Annotation	We present a study of ultrafast carrier transfer from highly luminescent states inside the core of silicon nanocrystal (due to quasidirect transitions) to states on the nanocrystal-matrix interface. This transfer leads to a sub-picosecond luminescence decay, which is followed by a slower decay component induced by carrier relaxation to lower interface states. We investigate the luminescence dynamics for two different surface passivation types and we propose a general model describing spectral dependence of ultrafast carrier dynamics. Our results stress the crucial role of the energy distribution of the interface states on surface-related quenching of quasidirect luminescence in silicon nanocrystals. We discuss how to avoid this quenching in order to bring the attractive properties of the quasidirect recombination closer to exploitation.
Workplace	Institute of Physics
Contact	Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579
Year of Publishing	2011

Number of the records: 1