文献类型：期刊文献

中文题名：Organic sensitizers with different thiophene units as conjugated bridges:molecular engineering and photovoltaics

英文题名：Organic sensitizers with different thiophene units as conjugated bridges:molecular engineering and photovoltaics

作者：Wenqin Li[1];Zihua Wu[1];Jinmin Wang[1];Weiwei Zhang[2];Min Wu[3];Weihong Zhu[2]

机构：[1]School of Environmental and Materials Engineering,College of Engineering,Shanghai Second Polytechnic University;[2]Shanghai Key Laboratory of Functional Materials Chemistry,Key Laboratory for Advanced Materials and Institute of Fine Chemicals,School of Chemistry and Molecular Engineering,East China University of Science and Technology;[3]Department of Chemistry,University of California

年份：2017

卷号：60

期号：2

起止页码：231

中文期刊名：Science China Chemistry

外文期刊名：中国科学（化学英文版）

收录：Scopus;CSCD:【CSCD2017_2018】；PubMed;

基金：supported by the Science Fund for Creative Research Groups(21421004);Distinguished Young Scholars, the National Natural Science Foundation of China(21325625);Oriental Scholarship,Programme of Introducing Talents of Discipline to Universities;Science and Technology Commission of Shanghai Municipality (14YF1410500 and 15XD1501400);Shanghai Young Teacher Supporting Foundation(ZZEGD14011);School Funding of Shanghai Second Polytechnic University(EGD14XQD08);"Shu Guang" project(13SG55)

语种：英文

中文关键词：organic sensitizers conjugated bridge solar cells photovoltaic performances

外文关键词：乙撑二氧噻吩;分子工程;光伏特性;敏化剂;染料敏化太阳能电池;共轭;TiO2薄膜;电化学阻抗谱

摘要：Three structural modifications with incorporation of alkyl,alkoxy and vinyl bond into the skeleton of thiophene bridge in D-π-A featured organic sensitizers are specifically developed for insight into their influences on photophysical,electrochemical as well as photovoltaic properties in nanocrystalline TiO_2-based dye sensitized solar cells(DSSCs).The insertion of vinyl bond into the conjugation bridge leads to the molecular planar configuration,and the conjugation bridge of 3,4-ethylenedioxythiophene(EDOT)is prone to positively shift its highest occupied molecular orbital(HOMO).The electrochemical impedance spectroscopy(EIS)results indicate that the grafted long alkyl chain onto thiophene is favorable to suppress dye aggregation when adsorbed onto TiO_2film and modification on interface of TiO_2/dye/electrolyte,resulting in a relatively high open-circuit voltage(V_(oc)).Under optimized conditions,dye LS-4 bearing hexylthiophene as the conjugation bridge shows a relatively high overall conversion efficiency of5.45%,with a photocurrent of 11.61 mA cm^(-2),V_(oc)of 744 mV.
Three structural modifications with incorporation of alkyl,alkoxy and vinyl bond into the skeleton of thiophene bridge in D-π-A featured organic sensitizers are specifically developed for insight into their influences on photophysical,electrochemical as well as photovoltaic properties in nanocrystalline TiO2-based dye sensitized solar cells（DSSCs）.The insertion of vinyl bond into the conjugation bridge leads to the molecular planar configuration,and the conjugation bridge of 3,4-ethylenedioxythiophene（EDOT）is prone to positively shift its highest occupied molecular orbital（HOMO）.The electrochemical impedance spectroscopy（EIS）results indicate that the grafted long alkyl chain onto thiophene is favorable to suppress dye aggregation when adsorbed onto TiO2film and modification on interface of TiO2/dye/electrolyte,resulting in a relatively high open-circuit voltage（Voc）.Under optimized conditions,dye LS-4 bearing hexylthiophene as the conjugation bridge shows a relatively high overall conversion efficiency of5.45%,with a photocurrent of 11.61 mA cm-2,Voc of 744 mV.