Ⅲ族氮化物紫光和近紫外LED的制备与研究

III族氮化物紫光和近紫外LED的制备与研究

TABLEOFCONTENTS

Abstract……….....…………………….…………….……...………….……..……………........…...……….III1Introduction........................................................................................】l1.1TheBackground………………………………………………………………….11.2TheResearchProcessandProblemsofultravioletLED…………………..61.2.1ThreebreakthroughsofGaNmaterial………………………………………6

1.2.2Thebasicpropertiesofthreenitridematerial……………………………一9

1.2.3TheresearchprocessofultravioletLED…………………………………12

1.2.4Dif五cultiesofultravioletLED……………………………………………131.3ResearchContentsofthisThesis………………………………………………..202EquipmentforGrowthandcharacterizationofGaNthinfilm………………………222.1Metalorganicchemicalvapordeposition.MOCVD………………………..222.1.1Transportationpipelineanddistributionsystem……………………22

2.1.2Reactor………………………………………………………………..24

2.1.3Scrubbersystem………………………………………………………26

2.1.4Controlsystem………………………………………………………..27

2。1.5Insitumonitoringsystem……………………………………………272.2TheMOCVDinthisstudy…………………………………………………272.3CharacterizationsofGaNthinfilmsanddevicesinthestudy……………….292.3.1Photoluminescence.PL……………………………………………………29

2.3.2X—raydiffraction.XRD…………………………………………………..30

2-3.3Atomicforcemicroscopy.AFM…………………………………………31

2.3.4Ramanspectrum…………………………………………………………..32

2.3.5Scanningelectronmicroscope.SEM………………………………….33

2.3.6Othercharacterizationmethods…………………………………………343PreparationofvioletLEDandresearchofelectronblockinglayer………………..353.1Introduction……………………………………………………………………353.2PreparationofvioletLED……………………………………………………..363.3DesignofvioletLED………………………………………………………..373.4APSYSsimulationforvioletLEDwithdifferentEBL……………………….383.4.1TheenergybanddiagramofvioletLEDbyAPSYSsimulation…38

3.4.2I—VcharacteristicsofvioletLEDbVAPSYSsimulation………….39

3.4.3ElectroluminescenceofvioletLEDbvAPSYSsimulation…………40

3.4.4IntemalquantumefficiencyofvioletLEDbyAPSYSsimulation.413.5OptimizationofelectronblockinglayerforVioletLEDbyexperiment……..42

III族氮化物紫光和近紫外LED的制备与研究

6.3Prospect………………………………………………………………………..99Reference…..………………………………………………………………..…………......…………...........101AchievementasaPh.D.Candidate…….……………..….………….......…………..………………..112Acknowledgements.……………….……………….……………...…………….....……….….......……..113

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