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