有机-量子点复合薄膜晶体管制备及其光电应用研究

有机-量子点复合薄膜晶体管制备及其光电应用研究有机/量子点复合薄膜晶体管制备及其光电应用研究

摘要：

有机/量子点复合薄膜晶体管具有优异的光电性能，已经成为研究的热点。本文介绍了一种简单、高效的方法，即利用溶液法制备有机/量子点复合薄膜，然后利用印刷法制备薄膜晶体管。通过X射线衍射和透射电子显微镜等手段对薄膜的结构和形貌进行了表征。研究了两种不同材料的复合薄膜的电学性质，并且比较了它们的光电性能。实验结果表明，对于有机半导体材料和量子点材料的复合薄膜，其光学响应和电流输出均得到了明显的提高。进一步的实验表明，利用这种复合薄膜制备的晶体管在光电转换、光控开关等方面具有很好的应用前景。

关键词：有机半导体；量子点；复合薄膜；印刷法；薄膜晶体管；光电应用

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