DSSC染料敏化太阳能电池-英文.ppt

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1、DyeSensitizedNanocrystallinePhotovoltaicCellGroup1–Luke,Matt,andJeffTheorySchematicofGraetzelCellTheadsorbeddyemoleculeabsorbsaphotonforminganexcitedstate.[dye*]Theexcitedstateofthedyecanbethoughtofasanelectron-holepair(exciton).Theexciteddyetransfersanelectrontothesemiconduc

2、tingTiO2(electroninjection).Thisseparatestheelectron-holepairleavingtheholeonthedye.[dye*+]Theholeisfilledbyanelectronfromaniodideion.[2dye*++3I-2dye+I3-]TheoryTheory:ChargeSeparationChargemustberapidlyseparatedtopreventbackreaction.Dyesensitizedsolarcell,theexciteddyetrans

3、fersanelectrontotheTiO2andaholetotheelectrolyte.InthePNjunctioninSisolarcellhasabuilt-inelectricfieldthattearsaparttheelectron-holepairformedwhenaphotonisabsorbedinthejunction.ObjectiveLearnaboutthephotovoltaiceffect.UnderstandtheScherrerformula.Procedure:TiO2SuspensionBeginw

4、ith6gcolloidalDegussaP25TiO2Incrementalyadd1mLnitricoraceticacidsolution(pH3-4)ninetimes,whilegrindinginmortarandpestleAddthe1mLadditionofdiluteacidsolutiononlyafterpreviousmixingcreatesauniform,lump-freepasteProcesstakesabout30minandshouldbedoneinventilatedhoodLetequilibrate

5、atroomtemperaturefor15minutesProcedure:DepositionofTiO2FilmAligntwoconductiveglassplates,placingoneupsidedownwhiletheonetobecoatedisrightsideupTape1mmwidestripalongedgesofbothplatesTape4-5mmstripalongtopofplatetobecoatedUniformlyapplyTiO2suspensiontoedgeofplate5microlitersper

6、squarecentimeterDistributeTiO2overplatesurfacewithstirringrodDrycoveredplatefor1minuteincoveredpetridishProcedure:DepositionofTiO2FilmAnnealTiO2filmonconductiveglassTubefurnaceat450oC30minutesAllowconductiveglasstocooltoroomtemperature;willtakeovernightStoreplateforlaterusePr

7、ocedure:PreparingAnthrocyaninDyeNaturaldyeobtainedfromgreenchlorophyllRedanthocyanindyeCrush5-6blackberries,raspberries,etc.in2mLdeionizedH2Oandfilter(canusepapertowelandsqueezefilter)Procedure:StainingTiO2FilmSoakTiO2platefor10minutesinanthocyanindyeInsurenowhiteTiO2canbesee

8、noneithersideofglass,ifitis,soakindyeforfivemoreminWashfilminH2Othen