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. [1 ]
Yang, Lei [1 ]
Gabrielsson, Erik [2 ]
Lohse, Peter W. [1 ]
Boschloo, Gerrit [1 ]
Sun, Licheng [2 ]
Hagfeldt, Anders [1 ]
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.
引用
收藏
页码:18070 / 18078
页数:9
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