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Combining a Small Hole-Conductor Molecule for Efficient Dye Regeneration and a Hole-Conducting Polymer in a Solid-State Dye-Sensitized Solar Cell
被引:34
作者:

Johansson, Erik M. J.
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Uppsala Univ, Dept Chem Angstrom, SE-75120 Uppsala, Sweden Uppsala Univ, Dept Chem Angstrom, SE-75120 Uppsala, Sweden

Yang, Lei
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Uppsala Univ, Dept Chem Angstrom, SE-75120 Uppsala, Sweden Uppsala Univ, Dept Chem Angstrom, SE-75120 Uppsala, Sweden

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Lohse, Peter W.
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Uppsala Univ, Dept Chem Angstrom, SE-75120 Uppsala, Sweden Uppsala Univ, Dept Chem Angstrom, SE-75120 Uppsala, Sweden

Boschloo, Gerrit
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Uppsala Univ, Dept Chem Angstrom, SE-75120 Uppsala, Sweden Uppsala Univ, Dept Chem Angstrom, SE-75120 Uppsala, Sweden

Sun, Licheng
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Royal Inst Technol, Sch Chem Sci & Engn, Stockholm, Sweden Uppsala Univ, Dept Chem Angstrom, SE-75120 Uppsala, Sweden

Hagfeldt, Anders
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Uppsala Univ, Dept Chem Angstrom, SE-75120 Uppsala, Sweden Uppsala Univ, Dept Chem Angstrom, SE-75120 Uppsala, Sweden
机构:
[1] Uppsala Univ, Dept Chem Angstrom, SE-75120 Uppsala, Sweden
[2] Royal Inst Technol, Sch Chem Sci & Engn, Stockholm, Sweden
基金:
瑞典研究理事会;
关键词:
PHOTOINDUCED ABSORPTION-SPECTROSCOPY;
ORGANIC-DYE;
INTERFACIAL PROPERTIES;
CHARGE SEPARATION;
TIO2;
PERFORMANCE;
GENERATION;
TRANSPORT;
LIQUID;
POLY(3,4-ETHYLENEDIOXYTHIOPHENE);
D O I:
10.1021/jp3052449
中图分类号:
O64 [物理化学(理论化学)、化学物理学];
学科分类号:
070304 ;
081704 ;
摘要:
In dye-sensitized solar cells (DSC) an efficient transfer of dioles from the oxidized dye to the contact is necessary, which in solid-state DSC is performed by hole-conductor molecules. In this report we use photoinduced absorption and transient absorption spectroscopy to show that a small hole-conducting molecule, tris(p-anisyl)amine, regenerates dye molecules in the pores of the dye-sensitized TiO2 nanoparticle electrode efficiently even for thick (>5 mu m) electrodes. For similar thicknesses we observe incomplete regeneration using a larger polymer hole-conductor. However, the performance of the solar cells with the small hole-conductor molecules is poor due to that inefficient hole conduction in these small molecules may limit the collection of the charges at the contacts. Polymer hole-conductors, which may have a good hole conductivity, also have a high molecular weight, which makes these polymers difficult to infiltrate into the smallest pores in the electrode. We show that a conducting polymer, P3HT, may be added to the small molecule hole-conductor, to enable better transport of the charges to the contact and to reduce recombination and therefore increase the photocurrent. This new device construction with a small molecule efficiently regenerating the dye molecules, and a polymer conducting the holes to the contact is therefore a promising pathway for solid-state dye-sensitized solar cells.
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页码:18070 / 18078
页数:9
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