界面碳膜钝化的tio2薄膜太阳电池的光电性能研究-应用化学专业论文.docx

光阳极材料作为对照组，并对其进行光学性能和光电化学性能表征分析。结果表明TiO2@C@CdS@C光阳极表现出较其它三种光阳极更优越的光电转化性能，这是因为双层 碳膜的存在可以作为保护层，能够有效避免量子点光腐蚀现象的发生。另外双层碳膜能够 同时调控TiO2半导体和CdS量子点的表面性能，大大减少电子空穴复合，从而电池性能 得以提高。因此，超薄碳膜作为一种新的界面修饰材料为构建高效率的DSSC和QDSSC 电池结 构提供了新思路。关键词：碳膜；界面；光电性能；敏化太阳电池IIThephotoelectrochemicalpropertiesofsolarcellsbasedon carbonlayermodifiedTiO2thinfilmsAbstractDye-sensitizedsolarcells(DSSC)andquantum-dotsensitizedsolarcells(QDSSC)arephotoelectrochemialsolarcellswithsimilarconfigurationandphotovoltaicmechanism.They haveattractedmuchattentionduetotheirlowcost,higherpowerconversionefficiencyandeaseof preparation.Thephotoanode basedon semiconductorofwider bandgapisthekeycomponentofthesesolarcells.Itisnotonlyasubstrateforsensitizerabsorptionbutalsoaconductorof photo-generatedelectronsfromthesensitizerstotheanode.Thisprojectfocusesonthemodificationofphotoanodebyintroducingultra-thincarbonlayerasaninterfacebetweenTiO2andsensitizeraswellasaninterfacebetweensensitizerandelectrolyte.Theinfluenceofcarbon layeronthelightharvestingandelectrontransportintheTiO2photoanodeshasbeenstudied. Someinterestingexperimentalresultsaresummarizedasbelow:Carbon-coatedTiO2nanorodarrays(NRs)havebeensynthesizedandusedas photoanodesinDSSC.Thesynthesisofcarbon-coatedTiO2NRsinvolveshydrothermalgrowth oforientedrutileTiO2NRsontransparentconductiveglassandthencoatingathincarbonlayer onthesurfaceofTiO2NRsinasubsequenthydrothermalprocesswithglucoseascarbonsource. TheDSSCbasedoncarbon-coatedTiO2NRsexhibitedsuperiorphotovoltaicperformancecomparedtothatbasedonnormalTiO2NRs.Itissuggestedthatthesuperiorphotovoltaicperformancewasmainlyascribedtoseveraladvantagesofcarbonlayer,which(1)suppressed therecombinationofphoto-generatedelectron-holepairsatthesurfaceofTiO2NRs,(2) enhancedtheelectroncollectioninphotoanodes, and(3)improvedtheharvestoflightby enhancingtheabsorptionofdyesonTiO2NRs.Theoptimalthicknessofthecarbonlayeris about6nmandthecorrespondingelectrodephotoelectricconversionefficiencyis5.14%which ishigherthantheefficiency1.03%ofTiO2NRs