2, 3-Disubstituted thiophene-based organic dyes for solar cells
KR Justin Thomas, YC Hsu, JT Lin, KM Lee… - Chemistry of …, 2008 - ACS Publications
Chemistry of Materials, 2008•ACS Publications
New organic dyes that contain variable lengths of conjugation, featuring oligothiophene and
arylamines at the 2-and 3-position, have been synthesized. These compounds are
characterized by photophysical, electrochemical, and theoretical computational methods.
Nanocrystalline TiO2-based dye-sensitized solar cells were fabricated using these
molecules as light-harvesting sensitizers. The overall efficiencies of the sensitized cells
range from 4.11 to 6.15%, compared to a cis-di (thiocyanato)-bis (2, 2′-bipyridyl)-4, 4 …
arylamines at the 2-and 3-position, have been synthesized. These compounds are
characterized by photophysical, electrochemical, and theoretical computational methods.
Nanocrystalline TiO2-based dye-sensitized solar cells were fabricated using these
molecules as light-harvesting sensitizers. The overall efficiencies of the sensitized cells
range from 4.11 to 6.15%, compared to a cis-di (thiocyanato)-bis (2, 2′-bipyridyl)-4, 4 …
New organic dyes that contain variable lengths of conjugation, featuring oligothiophene and arylamines at the 2- and 3-position, have been synthesized. These compounds are characterized by photophysical, electrochemical, and theoretical computational methods. Nanocrystalline TiO2-based dye-sensitized solar cells were fabricated using these molecules as light-harvesting sensitizers. The overall efficiencies of the sensitized cells range from 4.11 to 6.15%, compared to a cis-di(thiocyanato)-bis(2,2′-bipyridyl)-4,4′-dicarboxylate ruthenium(II)-sensitized device (7.86%) fabricated and measured under similar conditions. The devices made from these compounds have higher open-circuit voltage (VOC) compared to oligothiophene congeners with arylamines at the 2-position only. The hydrophobic segment at the 3-position appears to help retarding the charge transfer from the conduction band of TiO2 to the electrolyte, I3−. Supplementary studies of the transient photovoltage and electrochemical impedance are in support of retarded charge transfer of TiO2 (e−) with both oxidized sensitizer and I3−. Computation on a pair of compounds with and without arylamines at 3-position indicates that the former has larger charge transfer efficiency at the electronically excited state.
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