WFRF:(Martínez Ignacio)
Search: WFRF:(Martínez Ignacio) > (2010-2014) > A photo-induced ele...
- 6 of 6
- Previous record
- Next record
- To hitlist
A photo-induced electron transfer study of an organic dye anchored on the surfaces of TiO2 nanotubes and nanoparticles
- Ziolek, Marcin (author)
- Tacchini, Ignacio (author)
- Martinez, M. Teresa (author)
- show more...
- Yang, Xichuan (author)
- Douhal, Abderrazzak (author)
- show less...
- (creator_code:org_t)
- Royal Society of Chemistry (RSC), 2011
- 2011
- English.
- In: Physical Chemistry, Chemical Physics - PCCP. - : Royal Society of Chemistry (RSC). - 1463-9076 .- 1463-9084. ; 13:9, s. 4032-4044
- Journal article (peer-reviewed)
Abstract
Subject headings
Close
- We report on femtosecond-nanosecond (fs-ns) studies of the triphenylamine organic dye (TPC1) interacting with titania nanoparticles of different sizes, nanotubes and nanorods. We used time-resolved emission and absorption spectroscopy to measure the photoinduced dynamics of forward and back electron transfer processes taking place in TPC1-titania complexes in acetonitrile (ACN) and dichloromethane (DCM) solutions. We observed that the electron injection from the dye to titania occurs in a multi-exponential way with the main contribution of 100 fs from the hot excited charge-transfer state of anchored TPC1. This process competes with the relaxation of the excited state, mainly governed by solvation, that takes place with average time constants of 400 fs in ACN and 1.3 ps in DCM solutions. A minor contribution to the electron injection process takes place with longer time constants of about 1-10 ps from the relaxed excited state of TPC1. The latter times and their contribution do not depend on the size of the nanoparticles, but are substantially smaller in the case of nanotubes (1-3 ps), probably due to the caging effect. The contribution is also smaller in DCM than in ACN. The efficient back recombination takes place also in a multi-exponential way with times of 1 ps, 15 ps and 1 ns, and only 20-30% of the initial injected electrons in the conduction band are left within the first 1 ns after excitation. The faster recombination rates are suggested due to those originating from the free electrons in the conduction band of titania or the electrons in the shallow trap states, while the slower recombination is due to the electrons in the deep trap states. The results reported here should be relevant to a better understanding of the photobehaviour of an organic dye with promising potential for use in solar cells. They should also help to determine the important factors that limit the efficiency of solar cells based on the triphenylamine-based dyes for solar energy conversion.
Subject headings
- NATURVETENSKAP -- Kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences (hsv//eng)
Keyword
- SENSITIZED SOLAR-CELLS
- TRANSIENT ABSORPTION-SPECTROSCOPY
- NANOCRYSTALLINE THIN-FILMS
- EXCITED-STATE DYNAMICS
- RECOMBINATION DYNAMICS
- FEMTOSECOND DYNAMICS
- PROTON-TRANSFER
- VISIBLE ABSORPTION
- SOLVATION DYNAMICS
- INJECTION DYNAMICS
- Chemistry
- Kemi
Publication and Content Type
- ref (subject category)
- art (subject category)
Find in a library
- Physical Chemistry, Chemical Physics - PCCP (Search for host publication in LIBRIS)
To the university's database
- 6 of 6
- Previous record
- Next record
- To hitlist
Find more in SwePub
- By the author/editor
- Ziolek, Marcin
- Tacchini, Ignaci ...
- Martinez, M. Ter ...
- Yang, Xichuan
- Sun, Licheng
- Douhal, Abderraz ...
- About the subject
-
- NATURAL SCIENCES
- NATURAL SCIENCES
- and Chemical Science ...
- Articles in the publication
- Physical Chemist ...
- By the university
- Royal Institute of Technology
Search outside SwePub
- Extend your search to:
- Google Book Search
- Google Scholar
Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.
- Copyright © LIBRIS - National Library Systems
- LIBRIS.kb.se
