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Ultrafast terahertz photoconductivity in nanocrystalline mesoporous TiO.sub.2./sub. films

SYSNO ASEP	0342062
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Článek ve WOS
Title	Ultrafast terahertz photoconductivity in nanocrystalline mesoporous TiO₂ films
Author(s)	Němec, Hynek (FZU-D)_{RID, ORCID, SAI} Kužel, Petr (FZU-D)_{RID, ORCID, SAI} Kadlec, Filip (FZU-D)_{RID, ORCID, SAI} Fattakhova-Rohlfing, D. (DE) Szeifert, J. (DE) Bein, T. (DE) Kalousek, Vít (UFCH-W) Rathouský, Jiří (UFCH-W)_{RID, ORCID}
Source Title	Applied Physics Letters. - : AIP Publishing - ISSN 0003-6951 Roč. 96, č. 6 (2010), 062103/1-062103/3
Number of pages	3 s.
Language	eng - English
Country	US - United States
Keywords	time-resolved terahertz spectroscopy ; ultrafast photoconductivity ; TiO₂ nanoparticles ; brick and mortar technology
Subject RIV	BM - Solid Matter Physics ; Magnetism
R&D Projects	GP202/09/P099 GA ČR - Czech Science Foundation (CSF)
	IAA100100902 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR)
	GA104/08/0435 GA ČR - Czech Science Foundation (CSF)
	GD203/08/H032 GA ČR - Czech Science Foundation (CSF)
CEZ	AV0Z10100520 - FZU-D (2005-2011)
	AV0Z40400503 - UFCH-W (2005-2011)
UT WOS	000274516900030
DOI	10.1063/1.3313936
Annotation	Terahertz time-resolved spectroscopy is used to investigate the transport of photoexcited electrons in nanocrystalline mesoporous TiO2 films prepared by the recently proposed "brick and mortar" technology [Szeifert et al. Chem. Mater. 21, 1260 (2009)] with a variable fraction of nanocrystalline titania "bricks" and amorphous titania "mortar". Both long- and short-range conductivity is significantly enhanced upon calcination. After an ultrafast (subpicosecond) regime where the intrananograin conductivity dominates, the electron conductivity becomes limited by the interaction of electrons with the amorphous mortar. Comparison of the experimental results with Monte Carlo simulations of the electron motion allows us to determine the crystalline grain size after calcination and the yield of mobile photocarriers.
Workplace	Institute of Physics
Contact	Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579
Year of Publishing	2011

Number of the records: 1