Počet záznamů: 1
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 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Influence of the electron-cation interaction on electron mobility in dye-sensitized ZnO and TiO2 nanocrystals: a study using ultrafast terahertz spectroscopy Tvůrce(i) 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)Zdroj.dok. Physical Review Letters. - : American Physical Society - ISSN 0031-9007
Roč. 104, č. 19 (2010), 197401/1-197401/4Poč.str. 4 s. Jazyk dok. eng - angličtina Země vyd. US - Spojené státy americké Klíč. slova ultrafast dynamics ; terahertz spectroscopy ; semiconductor nanocrystals ; dye-sensitized semiconductors Vědní obor RIV BM - Fyzika pevných látek a magnetismus CEP GP202/09/P099 GA ČR - Grantová agentura ČR IAA100100902 GA AV ČR - Akademie věd LC512 GA MŠMT - Ministerstvo školství, mládeže a tělovýchovy CEZ AV0Z10100520 - FZU-D (2005-2011) UT WOS 000277699600050 DOI 10.1103/PhysRevLett.104.197401 Anotace 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. Pracoviště Fyzikální ústav Kontakt Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Rok sběru 2011
Počet záznamů: 1