%0 Journal Article
%A Eu, Seunghun
%A Hayashi, Shinya
%A Umeyama, Tomokazu
%A Matano, Yoshihiro
%A Araki, Yasuyuki
%A Imahori, Hiroshi
%D 2008
%T Quinoxaline-Fused Porphyrins for Dye-Sensitized Solar Cells
%U https://acs.figshare.com/articles/journal_contribution/Quinoxaline_Fused_Porphyrins_for_Dye_Sensitized_Solar_Cells/2950126
%R 10.1021/jp710400p.s002
%2 https://ndownloader.figshare.com/files/4648996
%K 1 H NMR spectroscopy
%K ZnQDA
%K HOMO
%K photovoltaic properties
%K tetraki
%K absorption
%K electron injection
%K porphyrin
%K ZnQMA
%K charge collection efficiency
%K DFT calculations
%K TiO 2 nanoparticles
%K II
%K UV
%X 5,10,15,20-Tetrakis(2,4,6-trimethylphenyl)-6‘-carboxyquinoxalino[2,3-β]porphyrinatozinc (II) (ZnQMA) and
5,10,15,20-tetrakis(2,4,6-trimethylphenyl)-6‘,7‘-dicarboxyquinoxalino[2,3-β]porphyrinatozinc (II) (ZnQDA)
have been synthesized to evaluate the effects of β,β‘-carboxyquinoxalino moieties on the structure and optical,
electrochemical, and photovoltaic properties of the porphyrins. Both ZnQMA and ZnQDA exhibited broadened
and red-shifted light absorption in UV−visible absorption spectra compared with 5,10,15,20-tetrakis(2,4,6-trimethylphenyl)porphyrinatozinc (II) (ZnP). ZnQMA and ZnQDA also showed decrease in the highest occupied
molecular orbital−lowest unoccupied molecular orbital (HOMO−LUMO) gap due to the extension of the
porphyrin π-system. From the results of 1H NMR spectroscopy and DFT calculations, ZnQMA and ZnQDA
were found to adopt saddle and planar structures, respectively. ZnQMA-sensitized TiO2 solar cell with TiO2
nanoparticles (P25) revealed the power conversion efficiency (η) of 5.2%, whereas ZnQDA-sensitized cell
showed η = 4.0%. The superior performance of the ZnQMA-sensitized solar cell to the ZnQDA-sensitized
one is originated from both the more favorable electron injection and charge collection efficiency.
%I ACS Publications