Influence of the Electron-Cation Interaction on Electron Mobility in Dye-Sensitized ZnO and TiO2 Nanocrystals: A Study Using Ultrafast Terahertz Spectroscopy
(2010) In Physical Review Letters 104(19).- Abstract
- 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... (More)
- 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. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/1617288
- author
- Nemec, Hynek
LU
; Rochford, J.
; Taratula, O.
; Galoppini, E.
; Kuzel, P.
; Polivka, T.
; Yartsev, Arkady
LU
and Sundström, Villy LU
- organization
- publishing date
- 2010
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Physical Review Letters
- volume
- 104
- issue
- 19
- article number
- 197401
- publisher
- American Physical Society
- external identifiers
-
- wos:000277699600050
- scopus:77952393477
- pmid:20866996
- ISSN
- 1079-7114
- DOI
- 10.1103/PhysRevLett.104.197401
- language
- English
- LU publication?
- yes
- additional info
- The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Chemical Physics (S) (011001060)
- id
- faefe3f4-d6d2-4f4b-b090-f91b1ea0c757 (old id 1617288)
- date added to LUP
- 2016-04-01 10:15:43
- date last changed
- 2023-11-09 16:23:23
@article{faefe3f4-d6d2-4f4b-b090-f91b1ea0c757, abstract = {{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.}}, author = {{Nemec, Hynek and Rochford, J. and Taratula, O. and Galoppini, E. and Kuzel, P. and Polivka, T. and Yartsev, Arkady and Sundström, Villy}}, issn = {{1079-7114}}, language = {{eng}}, number = {{19}}, publisher = {{American Physical Society}}, series = {{Physical Review Letters}}, title = {{Influence of the Electron-Cation Interaction on Electron Mobility in Dye-Sensitized ZnO and TiO2 Nanocrystals: A Study Using Ultrafast Terahertz Spectroscopy}}, url = {{http://dx.doi.org/10.1103/PhysRevLett.104.197401}}, doi = {{10.1103/PhysRevLett.104.197401}}, volume = {{104}}, year = {{2010}}, }