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1、PROGRESSINPHOTOVOLTAICS:RESEARCHANDAPPLICATIONSProg.Photovolt:Res.Appl.2011;19:21–32Publishedonline14May2010inWileyOnlineLibrary(wileyonlinelibrary.com).DOI:10.1002/pip.983RESEARCHARTICLEDrift-diffusionmodelforintermediatebandsolarcellsincludingphotofillingeffectsRuneStrandberg∗andTu
2、ridWorrenReenaasDepartmentofPhysics,NorwegianUniversityofScienceandTechnology,TRONDHEIM,NorwayABSTRACTAnoveldrift-diffusionmodelforintermediatebandsolarcells(IBSC)ispresented.Themodeldiffersfrompreviousdrift-diffusionmodelsbyallowingthecarrierconcentrationsinallthreebandstovary.Itisd
3、evelopedfortheidealizedcasewhereonlyradiativerecombinationoccursandwheretheIBhaszerowidth.ThemodelisusedtocomparetheperformanceofIBSCswheretheIB-regionisdopedtogetapartiallyfilledIB(prefilledIBSC)toIBSCswheretheIB-regionisnotdopedtopartiallyfilltheIB(photofilledIBSC).Numericalresultsshow
4、thataphotofilledIBSCcanachievehighefficiencieswhenoperatedunderconcentratedlight.Infact,forsomeparticularcases,aphotofilledcellwillperformbetterthanaprefilledcell.Theoptimaldegreeofprefilling,i.e.theratiooftheconcentrationofdopingatomstothetotalnumberofIB-states,isfoundforaparticularexamp
5、le.Itisalsoexaminedhowthecarrierconcentrationsinallthreebands,theconduction,theintermediateandthevalencebands,varyinprefilledandphotofilledIBSCs.Finally,thebanddiagramsofaprefilledandphotofilledIBSCarediscussed.Copyright©2010JohnWiley&Sons,Ltd.KEYWORDSintermediateband;solarcell;devicemod
6、elling;photofilling;optimalfilling*CorrespondenceRuneStrandberg,DepartmentofPhysics,NorwegianUniversityofScienceandTechnology,TRONDHEIM,N-7491,Norway.E-mail:rst@teknova.noReceived11July2009;Revised29January20101.INTRODUCTIONbeenshown,however,thatthefillingofintermediatebandswithdensitie
7、sofstatestypicalforIBSCsbasedonquantumTheintermediatebandsolarcell(IBSC)isathirdgenera-dotsuperlattices(QD-IBSCs)[10],canincreaseordecreasetionphotovoltaicconceptbasedontheprincipleoftwo-stepfromtheequilibriumfillingwhenthecellisilluminated—photogenerationviaanintermediateband(IB),sit
8、uatedinparti
