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AssigneeKorean Institute of Science and Technology
InventorsMin Jae Ko, Bong Soo Kim, Jin Young Kim, Hong Gon Kim, Hae Jung Son, Doh-Kwon Lee, Jin Ah Lee, Hee Suk Jung, Hwa Young Jin
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Disclosed is a method for adsorbing a dye for a dye-sensitized solar cell. The method includes: coating a paste including metal oxide nanoparticles on the upper surface of a titanium oxide thin film and calcining the coated paste to form a porous film; adding an additive to a sensitizing dye solution to promote the adsorption of the dye; and dipping the porous film in the sensitizing dye solution to adsorb the sensitizing dye onto the surface of the porous film. The sensitizing dye solution is a dispersion of the sensitizing dye in an organic solvent. Also disclosed are a working electrode prepared using the sensitizing dye solution and a dye-sensitized solar cell including the working electrode. The addition of the additive shortens the time of dye adsorption. Despite the shortened adsorption time, the dye does not undergo desorption in the long term as well as in the short term, ensuring long-term stability of the solar cell.
A sensitizing dye solution for the preparation of a working electrode of a dye-sensitized solar cell, comprising a sensitizing dye, an organic solvent, and an additive wherein the additive is a mixture of (i) a first additive selected from diphenylammonium trifluoromethanesulfonate (DPAT), pentafluoroanilinium triflate (PFPAT), pentafluorophenylammonium trifluoromethanesulfonate, N-(trimethylsilyl)bis(trifluoromethanesulfonyl)imide, 4-methylbenzenesulfonic acid, (7,7-dimethyl-2-oxobicyclo[2,2,1]-hept-1-yl)methanesulfonic acid, and mixtures of two or more thereof, and (ii) a second additive selected from hydrochloric acid, phosphoric acid, acetic acid, nitric acid, and mixtures of two or more thereof, wherein the contents of the first additive and the second additive are from 1.5 to 10 moles and from 1.5 to 10 moles, respectively, based on one mole of the sensitizing dye, and the molar ratio of the first additive to the second additive is from 99:1 to 80:20 wherein the additive improves the rate of adsorption of the sensitizing dye to titanium oxide.
Dependencies are inferred from the claim text.