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1、ARTICLEINPRESSPhysicaE41(2009)822–827ContentslistsavailableatScienceDirectPhysicaEjournalhomepage:www.elsevier.com/locate/physeTwo-stepgrowthofahierarchicalZnOnanostructurebyaqueousthermaldecompositioninaneutralsolutionanditsphotovoltaicpropertya,ba,cb,acJ.Chen,W
2、.Lei,J.L.Song,X.W.Sun,X.B.Zhang,W.Q.DengaSchoolofElectronicScienceandEngineering,SoutheastUniversity,Nanjing210096,PRChinabSchoolofElectricalandElectronicEngineering,NanyangTechnologicalUniversity,NanyangAvenue,Singapore639798,SingaporecSchoolofPhysical&Mathematical
3、Sciences,NanyangTechnologicalUniversity,NanyangAvenue,Singapore639798,SingaporearticleinfoabstractArticlehistory:Atwo-stepaqueousthermaldecompositionmethodwasusedtosynthesizeahierarchicalZnOReceived4December2008nanostructureonindium–tin-oxide(ITO)glassinaneutralsolu
4、tion.AsrevealedbyscanningelectronReceivedinrevisedformmicroscopyandtransmissionelectronmicroscopy,theproductconsistsofalayeredstructureofZnO5January2009nanorodsatthebottomandnanowireatop.TheZnOnanowiresweregrownalongthe[0001]directionAccepted12January2009with20nmind
5、iameterandexceeded10mminlength.ThegrowthmechanismofthehierarchicalZnOAvailableonline19January2009nanostructureisdiscussed.OurresultsindicatethatneutralsolutionandlowZnconcentrationarethePACS:keysforgrowinglongandthinZnOnanowiresinlargescale.HierarchicalZnOnanostruct
6、urehas81.10.Dnapplicationsinsolarcelldeviceastheelectrodecanlargelyimprovetheincidentphotontocurrent81.16.Beconversionefficiency(IPCE)andphotovoltaicconversionefficiency(PCE)valuesduetothehighaspectratio.NanowireZnOonthetoplayercanabsorbsignificantamountofquantumdotsan
7、dtheKeywords:photoexcitedelectronscanefficientlygettransferredintotheFTOsurfacethoughnanorodarray.ZnO&2009ElsevierB.V.Allrightsreserved.NanowireThermaldecompositionSolarcell1.Introductioncell[16].Generally,ZnOnanostructuresonasubstratecanbefabricatedwithzincprecursor
8、sinanalkalinesolutionwithapHZincoxide(ZnO)isamultifunctionalmaterialwithawidedirectvaluerangingfrom10to12[17–19].However,itisgenerallyband
