有機-量子點復合薄膜晶體管制備及其光電應用研究

有機-量子點復合薄膜晶體管制備及其光電應用研究有機/量子點復合薄膜晶體管制備及其光電應用研究

摘要：

有機/量子點復合薄膜晶體管具有優(yōu)異的光電性能，已經(jīng)成為研究的熱點。本文介紹了一種簡單、高效的方法，即利用溶液法制備有機/量子點復合薄膜，然后利用印刷法制備薄膜晶體管。通過X射線衍射和透射電子顯微鏡等手段對薄膜的結構和形貌進行了表征。研究了兩種不同材料的復合薄膜的電學性質(zhì)，并且比較了它們的光電性能。實驗結果表明，對于有機半導體材料和量子點材料的復合薄膜，其光學響應和電流輸出均得到了明顯的提高。進一步的實驗表明，利用這種復合薄膜制備的晶體管在光電轉換、光控開關等方面具有很好的應用前景。

關鍵詞：有機半導體；量子點；復合薄膜；印刷法；薄膜晶體管；光電應用

Abstract:

Organic/quantumdotcompositethinfilmtransistorshaveexcellentphotoelectricpropertiesandhavebecomearesearchhotspot.Inthispaper,asimpleandefficientmethodisintroduced,whichistoprepareorganic/quantumdotcompositethinfilmsbysolutionmethod,andthenpreparethinfilmtransistorsbyprintingmethod.ThestructureandmorphologyofthefilmwerecharacterizedbyX-raydiffractionandtransmissionelectronmicroscopy.Theelectricalpropertiesofthecompositefilmsoftwodifferentmaterialswerestudied,andtheirphotoelectricpropertieswerecompared.Theexperimentalresultsshowthatforthecompositefilmsoforganicsemiconductormaterialsandquantumdotmaterials,theiropticalresponseandcurrentoutputaresignificantlyimproved.Furtherexperimentsshowthattransistorsmadeusingthiscompositefilmhavegoodapplicationprospectsinphotoelectricconversion,photocontrolswitches,andotherfields.

Keywords:organicsemiconductor;quantumdots;compositethinfilm;printingmethod;thinfilmtransistor;photoelectricapplicationInrecentyears,organicsemiconductorsandquantumdotshaveattractedsignificantattentionduetotheiruniqueopticalandelectricalproperties.However,bothmaterialshavetheirownlimitationswhenusedalone,suchaspoorstabilityandlowefficiency.Thedevelopmentofcompositefilmsthatcombinetheadvantagesofthesetwomaterialsisaneffectivewaytoovercometheirlimitationsandimprovetheirperformance.

Thepreparationoforganicsemiconductor/quantumdotcompositefilmsistypicallyachievedusingaprintingmethod.Thismethodinvolvesdepositingtheorganicsemiconductorandquantumdotmaterialsontothesubstrateinalayeredormixedmanner,followedbyannealingtoformauniformfilm.Theresultingcompositefilmexhibitsenhancedabsorbance,extendedlightabsorptionrange,andimprovedchargeseparationandtransport,comparedtothepurematerials.

Furthermore,thinfilmtransistorsbasedonorganicsemiconductor/quantumdotcompositefilmshavebeenstudiedforphotoelectricapplications.Thesetransistorsshowimprovedphotocurrentresponseandphotoconductivity,indicatingtheirpotentialinphotoelectricconversion,photocontrolswitches,andotherfields.Moreover,avarietyoforganicsemiconductor/quantumdotcompositefilmswithdifferentstructuresandpropertieshavebeendeveloped,providingmoreoptionsfordesigningandoptimizingtheperformanceofthinfilmtransistors.

Inconclusion,thecompositefilmsoforganicsemiconductormaterialsandquantumdotmaterialshaveenormouspotentialforvariousphotoelectricapplications.FurtherresearchaimedatdevelopingmoreefficientandstablecompositematerialsandoptimizingdevicestructuresisnecessarytofacilitatetheircommercializationandpracticalapplicationInadditiontotheirpotentialinphotoelectricapplications,compositefilmsoforganicsemiconductormaterialsandquantumdotmaterialsalsohavepromisingprospectsinthefieldofflexibleelectronics.Withtheadventofwearabledevicesandflexibledisplays,thereisagrowingneedformaterialsthatcanbedepositedonflexiblesubstratesandwithstandmechanicaldeformationwithoutlosingtheirelectricalproperties.

Organicsemiconductorsareinherentlyflexibleandcanbeprocessedusingsolution-basedtechniquessuchasspin-coating,whichiscompatiblewithlarge-scaleproduction.However,theirperformanceisoftenlimitedbytheirlowchargecarriermobilityandstabilityunderoperationalconditions.Ontheotherhand,quantumdotshavehighchargecarriermobilityandarestableunderharshconditions,buttheyaretypicallysynthesizedusinghigh-temperaturemethodsthatarenotcompatiblewithflexiblesubstrates.

Bycombiningtheadvantagesoforganicsemiconductorsandquantumdots,compositefilmscanofferhighchargecarriermobility,stability,andflexibility.Forexample,arecentstudydemonstratedacompositefilmofanorganicsemiconductorandleadsulfide(PbS)quantumdotsthatshowedhighmobilityandstableperformanceunderbendingandstretchingconditions.Additionally,thefilmcouldbeprocessedusingsolution-basedtechniquesanddepositedonaflexiblesubstrate,makingitapotentialcandidateforflexibleelectronicsapplications.

Furthermore,compositefilmscanalsobeengineeredtoexhibituniqueopticalproperties,whichcanbeusefulforapplicationssuchasphotovoltaicsandluminescentdisplays.Forinstance,acompositefilmofanorganicsemiconductorandcadmiumselenide(CdSe)quantumdotswasfoundtohaveimprovedphotovoltaicperformanceandtunableemissionspectradependingonthesizeandconcentrationofthequantumdots.

Overall,thedevelopmentofcompositefilmsthatcombineorganicsemiconductorandquantumdotmaterialsholdsgreatpromiseforarangeofphotoelectricandflexibleelectronicsapplications.Byfurtherexploringtheirpropertiesandoptimizingtheirdevicearchitectures,thesematerialscouldrevolutionizethewaywethinkaboutelectronicdevicesandtheirintegrationintoourdailylivesInadditiontothepotentialapplicationsmentionedabove,thereareseveralotherareaswherecompositefilmsoforganicsemiconductorandquantumdotmaterialscouldmakeasignificantimpact.

Onesuchareaisinthedevelopmentofhighlyefficientsolarcells.Traditionalsilicon-basedsolarcellsareexpensivetoproduceandarelimitedintheirflexibilityandversatility.Bycontrast,organicsemiconductorandquantumdotmaterialsarelightweight,flexible,andcanbeeasilymanufacturedusinglow-costmethodssuchasinkjetprintingandspraycoating.

Researchershavealreadyshownthatorganic-inorganichybridsolarcellscanachievepowerconversionefficienciesofupto15%,whichiscomparabletotraditionalsilicon-basedsolarcells.However,thesehybridsolarcellsstillsufferfromstabilityissuesandalimitedlifetime,whicharechallengesthatneedtobeaddressedbeforetheycanbewidelyadoptedintheenergyindustry.

Anotherpotentialapplicationofcompositefilmsisinthedevelopmentofflexibledisplaysandlighting.OLEDs(organiclight-emittingdiodes)arealreadyinuseinconsumerelectronicssuchassmartphonesandtelevisions,buttheyarestilllimitedintheirbrightnessandefficiency.

Byincorporatingquantumdotsintotheorganicsemiconductormaterial,researchershavebeenabletoovercomesomeoftheselimitationsandcreatematerialswithimprovedemissionproperties.Forexample,acompositefilmmadeofablue-emittingorganicsemiconductorandgreen-emittingquantumdotswasfoundtohaveahigherluminousefficiencythaneithermaterialalone.

Finally,compositefilmsoforganicsemiconductorandquantumdotmaterialscouldalsobeusedinthedevelopmentofsensorsanddetectors.Quantumdotscanbetunedtoemitlightatspecificwavelengths,whichmakesthemidealforsensingapplicationssuchasdetectingenvironmentalpollutantsormonitoringglucoselevelsintheblood.

Byincorporatingthesequantumdotsintoanorganicsemiconductormatrix,researchershavecreatedmaterialswithenhanced