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1、LETTERSPUBLISHEDONLINE:26JUNE2011
2、DOI:10.1038/NPHOTON.2011.123TandemcolloidalquantumdotsolarcellsemployingagradedrecombinationlayerXihuaWang1†,GhadaI.Koleilat1†,JiangTang1,HuanLiu1,2,IllanJ.Kramer1,RatanDebnath1,LukaszBrzozowski1,D.AaronR.Barkhouse1,LarissaLevina1,SjoerdHoogland1andEd
3、wardH.Sargent1*Tuningoftheelectronicbandgapincolloidalquantumdotslayers19–22.Inthetunneljunction,degeneratelydopedpþþandþþ(CQDs)bychangingtheirsizeenablesthespectralresponsenmaterialsproduceathinjunctioninwhichthevalencebandofCQD-basedphotodetectors1–5andphotovoltaic6–12devicesonthep-
4、sideisenergeticallyalignedwiththeconductionbandontobetailored.Multi-junctionsolarcellsmadefromacombi-then-side,andthedepletionregionissufficientlythinthatcarriersnationofCQDsofdifferingsizesandthusbandgapsareacantunnelfromonesidetotheother.CQDsolids(ormaterialsofpromisingmeansbywhichto
5、increasetheenergyharvestedsimilarbandgapandcompatiblewithCQDprocessing)thatachieveþþþþfromtheSun’sbroadspectrum.Here,wereportthefirstCQDthesequentialcombinationoftransparentpfollowedbyntandemsolarcellsusingthesize-effecttuningofasingledopingarenotavailable.CQDmaterial,PbS.Weuseagradedr
6、ecombinationlayertoWesoughtanewstrategythatwouldbecompatiblewithCQDs,provideaprogressionofworkfunctionsfromthehole-accept-andthatwouldenabletherealizationofahighlyeffectivetandemingelectrodeinthebottomcelltotheelectron-acceptingelec-solarcell.Wetermthisnewconcepta‘gradedrecombinationt
7、rodeinthetopcell,allowingmatchedelectronandholelayer(GRL)’.WepresentapracticalGRLdesignusingspatialcurrentstomeetandrecombine.OurtandemsolarcellhasanbanddiagramstodepictaCQDtandemcellatequilibriumopen-circuitvoltageof1.06V,equaltothesumofthetwocon-(Fig.1c),andundershort-circuit(Fig.1d
8、)andopen-circuitstituentsingle-junctiondevices,andasolarpowerconversionconditions(Fig.1e).efficiencyofupto4.2%.PhotoholesfromthevalencebandofthefrontcellarerequiredtoFirstreported13in2005,full-spectrumquantumdotsolarcellsrecombinewithphotoelectronsfromtheconductionbandofthehavenowachie
9、vedso
