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Improving ordering extent and photovoltaic properties by extending π–conjugated area of electron-donating unit in polymer with d-a structure

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所屬學科：

分子表征

來源：

第十屆高分子物理國際研討會（PP’2012)(2012.6.4~8，成都）

簡介：

Understandingthecorrelationamongmolecularstructure,thinfilmmorphologyandphotovoltaicpropertiesofconjugatedpolymerappliedinbulkheterojunction(BHJ)polymersolarcells(PSCs)isofcriticalimportanceindesigninghigherefficiencyphotovoltaicpolymers.Consideringthatfeweffectivemethodsonthecontrolandoptimizationofstructuralorderandmorphologyofphotovoltaicblendsthroughabottom-upapproach,e.g.frommolecularstructuredesigntomorphologymodulationandthustophotovoltaicperformanceenhancement,hasbeeninvestigated,weproposedasystematicmethodologyofachievingstructuralorderandthusrelatedmorphologybymoleculardesignandsyntheticefforts:byextendingtheπ-conjugationareainatwo-dimensionalwayandreleasinggeometryhindrancewhichcouldincreasethepolymerinterchaininteraction,thusenhancingstructuralorder,self-assemblyandcarriermobility.Inourinvestigation,theprimarypolymer,namedasPBDTTT-S,exhibitsnostructuralorderduetothestrongsterichindrancecausedbyitsnon-coplanarsulfonylgroups.FromPBDTTT-StoPBDTDTTT-S-T,theπ-conjugatedareawasextendedinbothverticalandparalleldirections,fromwhichthesterichindranceofsidegroupswasreducedandthustheinter-molecularπ-πstackingwasenhanced.Adistinctiveorderedstructurewithwelldefined(100)and(010)chainregistrationwasobservedbygrazingincidenceX-rayscattering(GIXS)ofPBDTDTTT-S-T.Theincreasedinter-chainπ-overlapareaandorderedpackingstructureofPBDTDTTT-S-Tresultsinagoodholemobilityof2.76ｘ10-3cm2V-1s-1,whichisoneorderofmagnitudehigherthanthatofPBDTTT-S.SolarcellsbyPBDTDTTT-S-Tblendedwith[6,6]-phenylC70-butyricacidmethylester(PC70BM)exhibitsapowerconversionefficiency(PCE)of7.81%,whichis25%higherinefficiencycomparedwiththeoriginalpolymerPBDTTT-S.Moreimportantly,thisworktriedtoestablishafundamentalunderstandingofthecorrelationamongmolecularstructure,thinfilmmorphologyandphotovoltaicpropertiesofconjugatedpolymers,whichprovidesaguidanceformoleculardesignofnewphotovoltaicpolymers.

作者：

Ye Huang, Xia Guo, Feng Liu, Lijun Huo, Thomas P. Russell, Yongfang Li, Jianhui Hou, Charles C. Han

上傳時間：

2012-11-26 14:11:11

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