12Light harvesting in OSCs

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1、LightharvestinginorganicsolarcellsTamHoiLam,QingyiYang,WuZhenghui,WuBoandFurongZhuDepartmentofPhysicsandInstituteofAdvancedMaterialsHongKongBaptistUniversity武汉光电国家实验室,July26,2013OutlineApproachesoflightharvestinginOSCsAninsightofabsorptionenhancemen

2、tingratingOSCsscattering,surfaceplasmonandwaveguideOpticalenhancementinsemitransparentOSCsApplicationsofsemitransparentOSCsSummary2Photovoltaictechnologiesc-Si,polyc-SiBulkIII-Vsemiconductor(GaAs,InP）Thinfilmc-Si,a-Si,hybridSiII-VIsemiconductorfil

3、m(CdTe)ThinFilmCuInSe,Cu(InGa)Se22SolarcellsSoliddye-sensitizedsolarcellsOrganicOrganic/inorganichybridOrganic(polymer&smallmolecule)Nano-structuredNano-particle,nano-wire&quantumdot-basedsolarcells3Si&thinfilmsolarcells4OtherPVtechnologiesBenefitorin

4、tendedbenefit(allEfficiencyatChallengesTypearelightweightcomparedtowhichitissilicon)viableCIGSHighefficiencyatlowcost,longlife,10-15%i.e.Priceofindiumtransparent,nodisposalproblemsnowFairlyhighefficiency(belowCIGS,10-15%i.e.Cdisapoison,aboveothers).We

5、llproven–over$1.5nowforcontrolleddisposalbillionofrecentordersbasedonbeingbuildingsonly,sonotallowedCdTelowestcostinconsumergoodsetc,toughtoprint,supplyofTe?Tolerantofpolarizedlight,lowlevel10-15%i.e.LiquidsDSSClight,transparent,extremeangleofnowPrice

6、ofruthenium?incominglight,choiceofcolors,nodisposalproblemsLowcost,hugematerialsvarieties,>10%Cost,efficiency,OSCtunableelectronic/opticalpropertiesstability,narrowspectrum5ConversionstepsConversionstepIncidentphotonsLossmechanism-Reflection,Transmiss

7、ionLightabsorption-SpectralmismatchExcitongeneration-Excitonrecombination-ExcitiontransferwithrecombinationsExcitondiffusion-NochargeseparationandsubsequentrecombinationsofexcitonsChargeseparation-Recombinationofcharges-LimitedmobilityofchargesCharget

8、ransport-Recombinationnearelectrodes-EnergybarrieratelectrodesSeparatedchargesatelectrodes6OSCisathinfilmsystemJ=2J=3J=M-1+E1N2=n2-ik2N3=n3-ik3NM-1=nM-1-ikM-1IncidentE++++lightE2E3E3EME-E1E----E2E3E3EMJ=1N1=n1-ik1J=MN=n0OPVAirGlasssubstrateAir