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

作　　者：Min-Woo Lee Jae-Yup Kim Hyung-Geun Lee Hyun Gil Cha Duck-Hyung Lee Min Jae Ko 

机构地区：[1]Bio-Based Chemistry Research Center,Advanced Convergent Chemistry Division,Korea Research Institute of Chemical Technology(KRICT),Ulsan 44429,Republic of Korea [2]Department of Chemical Engineering,Dankook University,Yongin 16890,Republic of Korea [3]Department of Chemistry,Sogang University,Seoul 04107,Republic of Korea [4]Department of Chemical Engineering,Hanyang University,Seoul 04763,Republic of Korea [5]Institute of Nano Science and Technology,Hanyang University,Seoul 04763,Republic of Korea

出　　处：《Journal of Energy Chemistry》2021年第3期208-216,共9页能源化学（英文版）

基　　金：supported by Basic Science Research through the National Research Foundation of Korea(NRF)funded by the Ministry of Education(No.2017R1D1A1B03035077);also supported by Research Program(2018R1A2B2006708);Technology Development Program to Solve Climate Changes(2015M1A2A2057062)funded by the National Research Foundation under the Ministry of Science and ICT,Republic of Korea;supported by the Defense Challengeable Future Technology Program of the Agency for Defense Development,Republic of Korea。

摘　　要：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.

关 键 词：Dye-sensitized solar cells Donor-acceptor dyes Electron-rich unit Wide-range absorption Impedance spectroscopy 

分 类 号：TM914.4[电气工程—电力电子与电力传动] TQ610.1[化学工程—精细化工]