10.1021/acsomega.7b01195.s001
Sara S.
M. Fernandes
Sara S.
M.
Fernandes
M. Cidália R. Castro
M. Cidália R.
Castro
Ana Isabel Pereira
Ana Isabel
Pereira
Adélio Mendes
Adélio
Mendes
Carlos Serpa
Carlos
Serpa
João Pina
João
Pina
Licínia L. G. Justino
Licínia
L. G. Justino
Hugh D. Burrows
Hugh D.
Burrows
M. Manuela M. Raposo
M.
Manuela M. Raposo
Optical and Photovoltaic Properties of Thieno[3,2‑<i>b</i>]thiophene-Based Push–Pull Organic Dyes with Different
Anchoring Groups for Dye-Sensitized Solar Cells
American Chemical Society
2017
rhodanine -3-acetic acid
TiO 2 mesoporous films
nanocrystalline TiO 2
Different Anchoring Groups
cyanoacetic acid
Dye-Sensitized Solar Cells
dye power conversion efficiencies
rhodanine -3-acetic acid groups
coadsorbed N 719
time-dependent DFT calculations
ruthenium-based N 719 dye
DSSC
2- cyanoacetic acid
2017-12-29 09:13:37
Journal contribution
https://acs.figshare.com/articles/journal_contribution/Optical_and_Photovoltaic_Properties_of_Thieno_3_2_i_b_i_thiophene-Based_Push_Pull_Organic_Dyes_with_Different_Anchoring_Groups_for_Dye-Sensitized_Solar_Cells/5743209
The
effect of anchoring groups on the optical and electrochemical
properties of triphenylamine-thienothiophenes, and on the photovoltaic
performance of DSSCs photosensitized with the prepared dyes, was studied
using newly synthesized compounds with cyanoacetic acid or rhodanine-3-acetic
acid groups. Precursor aldehydes were synthesized through Suzuki cross-coupling,
whereas Knoevenagel condensation of these with 2-cyanoacetic acid
or rhodanine-3-acetic acid afforded the final
push–pull dyes. A comprehensive photophysical study was performed
in solution and in the solid state. The femtosecond time-resolved
transient absorption spectra for the synthesized dyes were obtained
following photoexcitation in solution and for the dyes adsorbed to
TiO<sub>2</sub> mesoporous films. Information on conformation, electronic
structure, and electron distribution was obtained by density functional
theory (DFT) and time-dependent DFT calculations. Triphenylamine–thienothiophene
functionalized with a cyanoacetic acid anchoring group displayed the
highest conversion efficiency (3.68%) as the dye sensitizer in nanocrystalline
TiO<sub>2</sub> solar cells. Coadsorption studies were performed for
this dye with the ruthenium-based <b>N719</b> dye, and they
showed dye power conversion efficiencies enhanced by 20–64%.
The best cell performance obtained with the coadsorbed <b>N719</b> and cyanoacetic dye showed an efficiency of 6.05%.