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High efficiency dye-sensitized solar cells

A technology for solar cells and dye sensitization, applied in the field of dye-sensitized solar cells, can solve problems such as limiting the scale of dye-sensitized solar cells, and achieve the effects of improving photoelectric conversion efficiency, increasing stability, and reducing series resistance

Inactive Publication Date: 2013-03-27
DYENAMO
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Problems solved by technology

Therefore, I - / I 3 - The corrosiveness of electricity to most metals and packaging materials limits the scale-up of dye-sensitized solar cells

Method used

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[0075] experimental method

[0076] All reagents were purchased from Sigma Aldrich unless otherwise stated.

[0077] Synthesis of cobalt complexes. Cobalt complex [Co(bpy) 3 (PF) 2 ] 2+ 、[Co(dmb) 3 (PF 6 ) 2 ] 2+ 、[Co(dtb) 3 (PF 6 ) 2 ] 2+ and [Co(phen) 3 (PF 6 ) 2 ] 2+ Synthesized by methods described elsewhere [see Sapp, S.A.; Elliott, C.M.; Contado, C.; Caramori, S.; Bignozzi, C.A.J.Am.Chem.Soc. Phys.Chem.C 2009, 113, 14040]. In simple terms, one equivalent of CoCl 2 .6H 2 0 and 3.3 equivalents of bipyridine ligand were dissolved in a minimum of methanol (Merck) and the solution was stirred at reflux for 2 hours. Then excess ammonium hexafluorophosphate (NH 4 PF 6 ) was added to the solution to give the precipitated compound which was filtered, washed with methanol and ethanol, dried under vacuum and used without further purification.

[0078] The oxidation of cobalt complex is to add slightly excess NOBF in the acetonitrile solvent of cobalt complex 4 ...

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Abstract

Cobalt polypyridine complexes are interesting alternative redox mediators for large scale manufacturing of dye-sensitized solar cells (DSCs) since they are less aggressive towards metal contacts and absorb less light than iodide / triiodide. Here we have examined the effect of steric properties of triphenylamine-based organic sensitizers and cobalt polypyridine redox mediators on the electron lifetime and overall device performance in DSCs. Matching the steric bulk of the dye and redox mediator was found to minimize recombination and mass transport problems in DSCs employing cobalt redox mediators. Recombination was efficiently slowed down by introducing insulating butoxyl chains on the dye, allowing the use of a cobalt redox mediator with a less steric bulk. The best efficiency of DSCs sensitized with a triphenylamine-based organic dye in combination with cobalt(II / III) tris(2,2'-bipyridyl) match the highest efficiencies obtained so far with iodide-free electrolytes, reaching a 6.3 % overall conversion efficiency under AMI.5 condition (1000 Wm-2) and an efficiency of 7.8 % at 1 / 10 of a sun. Organic dyes with high extinction coefficients can thus be used instead of standard ruthenium sensitizers to build thin films DSCs in order to overcome mass transport and recombination limitations associated with the cobalt redox couples. DSCs sensitized with organic dyes employing cobalt redox mediators are promising for low light intensity applications since the efficiency and voltage is high at indoor illumination.

Description

technical field [0001] The invention relates to a dye-sensitized solar cell, which is characterized in that it is composed of a light-absorbing dye-sensitized porous semiconductor electrode, a counter electrode and an electrolyte containing redox pairs. Background technique [0002] As a low-cost solar cell, dye-sensitized solar cells (DSCs) have attracted considerable attention as a potential replacement for silicon-based photovoltaic devices. In dye-sensitized solar cells, light is usually absorbed by a porous wide-bandgap semiconductor (usually TiO 2 ) of the dye molecule uptake. After absorbing light, the dye excited by light injects electrons into the conduction band of the semiconductor to become an oxidized dye. Subsequently, the dye in the oxidized state is regenerated by redox couples in the electrolyte. [0003] At present, in the field of dye-sensitized solar cells, the highest cell efficiency can reach 11%, which is made of metal complex dyes based on rutheniu...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/20H01L51/00H10K99/00
CPCY02E10/542H01L51/0059H01L51/0083H01G9/2031Y02E10/50Y02E10/549H10K85/631H10K85/331
Inventor 伊丽莎白·吉布森桑德拉·费尓特埃里克·加布里埃尔松
Owner DYENAMO
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