Zaumseil 2007 Chem Rev (Electron and Ambipolar Transport in OFETs)

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1、1296Chem.Rev.2007,107,1296-1323ElectronandAmbipolarTransportinOrganicField-EffectTransistorsJanaZaumseilandHenningSirringhaus*CavendishLaboratory,JJThomsonAvenue,CambridgeCB30HE,UnitedKingdomReceivedJuly31,2006Contents1.Introduction1.Introduction1296Eve

2、rsincethefirstfield-effecttransistors(FETs)based2.BasicsofOrganicField-EffectTransistors1298onpolymer1-3andsmallmolecule4,5semiconductorswere2.1.WorkingPrincipleofFETs1298reported,interestinthisfieldhasrisensteadilyforboth2.2.Current-VoltageCharacterist

3、ics1299technologicalandscientificreasons.Inrecentyears,thenumberofpublicationsonorganicandpolymertransistors2.3.DeviceStructures1300hasincreasedsubstantially(seeFigure1a).OrganicFETs2.4.ChargeTransportModels1300aretechnologicallyinterestingbecausetheyco

4、uldserveas2.5.RoleofInjectingElectrodes1301themaincomponentincheapandflexibleelectroniccircuits.2.6.RoleoftheGateDielectric1302Majorpossibleapplicationsareradiofrequencyidentification2.7.RecentDevelopmentsforp-ChannelFETs1303(RF-ID)tags6,7andflexibledis

5、plays.8-12Prototypesofthese3.Organicn-ChannelFETs1303productshavebeendemonstratedandarenowgettingclose3.1.Motivation1303tobeingbroughttothemarket.13,14Scientifically,organic3.2.ProblemsandChallenges1304semiconductorsshowinterestingcharacteristicsbothsim

6、ilar3.3.DesignRulesandNewMaterials1304toanddifferentfromknowninorganicsemiconductors,in3.4.RoleofDielectricforElectronTransport1305particularamorphoussilicon.Thechargetransportand4.AmbipolarField-EffectTransistors1306emissionpropertiesoforganicsemicondu

7、ctorshavebeenunderintenseinvestigationforyears,andfield-effecttransis-4.1.Motivation1306torshaveproventobeapowerfultoolforthoseefforts.4.2.DeviceCharacteristicsandChallengesof1307CommonorganicsemiconductorsarerelativelywidebandAmbipolarFETsgapsemiconduc

8、torswithbandgapsintherangeof2-3eV.4.3.AmorphousSiliconandCarbonNanotube1308MethodsforcontrolleddopingofthesematerialsarenotwellAmbipolarFETsestablished,mainlybecausedopingoftenrequiresthemixing4.4.OrganicBilayerFETs1308ofaredoxac