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Charge transport and localization in nanocrystalline CdS films: A time-resolved terahertz spectroscopy study
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SYSNO ASEP 0361370 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Charge transport and localization in nanocrystalline CdS films: A time-resolved terahertz spectroscopy study Author(s) Mics, Zoltan (FZU-D)
Němec, Hynek (FZU-D) RID, ORCID, SAI
Rychetský, Ivan (FZU-D) RID, ORCID
Kužel, Petr (FZU-D) RID, ORCID, SAI
Formánek, P. (CZ)
Malý, P. (CZ)
Němec, P. (CZ)Source Title Physical Review. B - ISSN 1098-0121
Roč. 83, č. 15 (2011), "155326-1"-"155326-6"Number of pages 6 s. Language eng - English Country US - United States Keywords time-resolved THz spectroscopy ; CdS nanoparticles ; electron transport ; chemical bath deposition Subject RIV BM - Solid Matter Physics ; Magnetism R&D Projects GD202/09/H041 GA ČR - Czech Science Foundation (CSF) GP202/09/P099 GA ČR - Czech Science Foundation (CSF) GA202/09/0430 GA ČR - Czech Science Foundation (CSF) LC512 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) IAA100100902 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR) CEZ AV0Z10100520 - FZU-D (2005-2011) UT WOS 000292151200004 DOI 10.1103/PhysRevB.83.155326 Annotation Assessment of characteristic length and time scales of the charge localization in nanostructured semiconductors is a key point for understanding the initial stage of carrier transport after photoexcitation. A use of time-resolved terahertz spectroscopy and Monte Carlo simulations of the electron motion allow us to obtain this information and develop a microscopic model of the electron transport in a nanocrystalline CdS film. A weak localization is observed inside individual nanocrystals (NCs) while much stronger localization stems from the existence of NC clusters. The efficiency of the short-range transport is controlled by the excess energy of electrons: Its increase enhances the conductive coupling between adjacent NCs and clusters. Relaxation of electrons with high excess energy then leads to a decrease of their mobility on a sub-ps time scale. Filling of conduction-band states by increasing the optical pump fluence allows us to maintain a high mobility even at later times. Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2012
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