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Influence of the electron-cation interaction on electron mobility in dye-sensitized ZnO and TiO.sub.2./sub. nanocrystals: a study using ultrafast terahertz spectroscopy
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SYSNO ASEP 0350369 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Influence of the electron-cation interaction on electron mobility in dye-sensitized ZnO and TiO2 nanocrystals: a study using ultrafast terahertz spectroscopy Author(s) Němec, Hynek (FZU-D) RID, ORCID, SAI
Rochford, J. (US)
Taratula, O. (US)
Galoppini, E. (US)
Kužel, Petr (FZU-D) RID, ORCID, SAI
Polívka, T. (CZ)
Yartsev, A. (SE)
Sundström, V. (SE)Source Title Physical Review Letters. - : American Physical Society - ISSN 0031-9007
Roč. 104, č. 19 (2010), 197401/1-197401/4Number of pages 4 s. Language eng - English Country US - United States Keywords ultrafast dynamics ; terahertz spectroscopy ; semiconductor nanocrystals ; dye-sensitized semiconductors 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) LC512 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) CEZ AV0Z10100520 - FZU-D (2005-2011) UT WOS 000277699600050 DOI 10.1103/PhysRevLett.104.197401 Annotation Charge transport and recombination in nanostructured semiconductors are poorly understood key processes in dye-sensitized solar cells. We have employed time-resolved spectroscopies in the terahertz and visible spectral regions supplemented with Monte Carlo simulations to obtain unique information on these processes. Our results show that charge transport in the active solar cell material can be very different from that in nonsensitized semiconductors, due to strong electrostatic interaction between injected electrons and dye cations at the surface of the semiconductor nanoparticle. For ZnO, this leads to formation of an electron-cation complex which causes fast charge recombination and dramatically decreases the electron mobility even after the dissociation of the complex. Sensitized TiO2 does not suffer from this problem due to its high permittivity efficiently screening the charges. Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2011
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