Effects of structure and electronic properties of D-π-A organic dyes on photovoltaic performance of dye-sensitized solar cells

Min-Woo Lee; Jae-Yup Kim; Hyung-Geun Lee; Hyun Gil Cha; Duck-Hyung Lee; Min Jae Ko

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Effects of structure and electronic properties of D-π-A organic dyes on photovoltaic performance of dye-sensitized solar cells

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Herein,we examine the performance of dye-sensitized solar cells containing five D-π-A organic dyes designed by systematic modification of π-bridge size and geometric structure.Each dye has a simple push-pull structure with a triarylamino group as an electron donor,bithiophene-4,4-dimethyl-4 H-cyclopenta 1,2-b:5,4-b’]dithiophene(M11),4,4-dimethyl-4 H-cyclopenta[1,2-b:5,4-b’]dithiophenethiophene(M12),thiophene-4,4-dimethyl-4 H-cyclopenta[1,2-b:5,4-b’]dithiophene(M13),4,4-dimethyl-4 H-cyclopenta[1,2-b:5,4-b’]dithiophene-benzene(M14),and 4,4-dimethyl-4 H-cyclopenta[1,2-b:5,4-b’]dithiophene(M15)units asπ-bridges,and cyanoacrylic acid as an electron acceptor/anchor.The extension of theπ-bridge linkage favors wide-range absorption but,because of the concomitant molecular volume increase,hinders the efficient adsorption of dyes on the TiO_(2) film surface.Hence,higher loadings are achieved for smaller dye molecules,resulting in(i)a shift of the TiO_(2) conduction band edge to more negative values,(ii)a greater photocurrent,and(iii)suppressed charge recombination between the photoanode and the redox couple in the electrolyte.Consequently,under one-sun equivalent illumination(AM 1.5 G,100 mW/cm^(2)),the highest photovoltage,photocurrent,and conversion efficiency(η=7.19%)are observed for M15,which has the smallest molecular volume among M series dyes.

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《天然气化学（英文版）》 |2021年第3期|208-216|共9页
作者
Min-Woo Lee; Jae-Yup Kim; Hyung-Geun Lee; Hyun Gil Cha; Duck-Hyung Lee; Min Jae Ko;
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Bio-Based Chemistry Research Center Advanced Convergent Chemistry Division Korea Research Institute of Chemical Technology(KRICT) Ulsan 44429 Republic of Korea;

Department of Chemical Engineering Dankook University Yongin 16890 Republic of Korea;

Department of Chemistry Sogang University Seoul 04107 Republic of Korea;

Bio-Based Chemistry Research Center Advanced Convergent Chemistry Division Korea Research Institute of Chemical Technology(KRICT) Ulsan 44429 Republic of Korea;

Department of Chemistry Sogang University Seoul 04107 Republic of Korea;

Department of Chemical Engineering Hanyang University Seoul 04763 Republic of Korea;

Institute of Nano Science and Technology Hanyang University Seoul 04763 Republic of Korea;

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Effects of structure and electronic properties of D-π-A organic dyes on photovoltaic performance of dye-sensitized solar cells

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