有机光电半导体材料及其未来之应用.ppt

有機光電半導體材料及其未來之應用T.-F.GuoNCKUInstititeofElectro-OpticalScienceEngineering1郭宗枋助理教授InstituteofElectro-OpticalScienceandEngineering,NationalChengKungUniversity,Tainan,Taiwan701成功大學光電科學與工程研究所01/16/2007

OutlinesT.-F.GuoNCKUInstititeofElectro-OpticalScienceEngineering2OrgannicphotovoltaicandsolarcellsSemiconductorsOLEDsandPLEDs基礎原理和應用Organicsemiconductors(energyanddelocalizationofchargecarriers)Conclusions

Fundamentalscienceofinorganicsemiconductors

TypicalSemiconductingMaterials

EnergyBandDiagramofaconductor,semiconductor,andinsulator(a)aconductor(b)asemiconductor(c)aninsulator

Beginningoforgnaicsemiconductor(πbonding)Side-by-SideBonding

Conjugated(共軛):alternativelydouble-singlebondsCHCHCHCHCHCH雙鍵單鍵

BangGapofPolyacetylene………..……BandGap

ConjugatedpolymerSigmabondDelocalized?electroncloudhttp://www.cdtltd.co.ukAlternatingsingle-doublebonds

CreatingnewmaterialsfromoldmaterialsnEg=2.4eVPPVOR1nOEg=2.1eVR2R1nEg=2.4eVR2nEg=3.0eVPPPnEg=1.4eVPAThroughthestructureengineering,polymerswithdifferentemittingcolorsweresynthesized.

DelocalizationofChargeCarriersinPolyacetyleneLocalized!Chargecannotgoanywhere!!!Delocalized!Chargecarrierscanmovearound!!!

DelocalizationandTransportofChargeCarriers

ConjugatedPolymers:BasicMaterialsandChemistryConductionpolymers:Polyacetylene,Polyaniline,PEDOT/PSS…etc.Semiconductingpolymers:Polythiophenes,Oligothiophenes…etc.Light-emitting/PhotovoltaicPolymers:Poly-(para-phenylene-vinylene),Poly(para-phenylene),Polyfluorene…etc.

ScientificInterestinOrganicMaterials1950’s–steadyworkoncrystallineorganicsstarts1970’s–organicphotoconductors(Xerography)1980’s–organicnon-linearopticalmaterials1987–Kodakfirstpublishedtheefficientorganiclight-emittingdevices(OLED)1990–Cambridgegroupspublishthefirstpolymerlight-emittingdiodes(PLED)Sincethen,thefieldhasdramatica