基于ZnO的异质结的组建及其光电性能研究(5)

2021-04-05 03:35

河南大学微电子学与同体电子学专业2007级硕士学位论文

3.ZnO/NiO

glasssubstratesheterojunctionbyisfabricatedbeamonfluorine-dopedtilloxideconductingtechnique.Thelaser-molecularepitaxysamplesarecharacterizedbyX—raydiffraction,rectificationcharacteristic,UV-visibleabsorptionspectroscopyandsurfacephotovoltagespectroscopy.The

aall-oxideheterojunctionshowsclearrectificationcharacteristicwith

photovoltaicresponseat373n/nthresholdvoltageofabout1.5VTheneworiginatingfromZnOisenhancedgreatly

nlTlandawidephotovoltagebandfrom390to600

showthisisbroughtbyZnO/NiOheterojunction.andotherTheresultsheterojunctionhaspotentialapplicationinphotocells

optoelectronicdevices.

4.ZnOthinfilms

ZnOthinfilmsareand(Bu4N)2(Ru)(dcbpyH)2(NCS)2.(calledonN719)sensitizedgrownfluorine—dopedtiIloxideconductingglasssubstratesusinglasermolecularbeamepitaxy.Ultraviolet-visibleabsorption,photolumineseence,surfacephotovoltagespectroscopy,andRamanscatteringareemployedtoprobeintothetransitionprocessofphotogeneratedchargesandthe

ainteractionbetweenZnOandN719.Theexperimentalresultsindicatethatthereisstronginteraction

greatlybetweenN719enhancestheandZnOthroughchemiadsorption.The

thustheinteractionphotogeneratedchargeseparationandphotovoltaicresponseoftheZnOfilm

butremarkedlyweakensitsradiativerecombination,i.e.photoluminescence,implyingstrongenergy

weakandchargetransferoccuringbetweenN719ataboutandZnO.Inaddition,anewIlrIlphotoluminescencepeakobserved720isattributedtotheelectron.holerecombinationofN719.

Keywords:ZnO/NiOheterojunction;N719/ZnOheterostructure;L—MBEtechnique;

surfacephotovoltagespectroscopy


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