SiSiGe量子阱空穴子带跃迁及其在中远红外光发射探测器中的应用研究

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1、厦门大学博士学位论文Si/SiGe量子阱空穴子带跃迁及其在中远红外光发射/探测器中的应用研究姓名：林桂江申请学位级别：博士专业：凝聚态物理指导教师：余金中20080601子阱红外探测器FTIR红外吸收谱测试和分析，得到吸收峰处于大气传输窗口3～5微米波段的量子阱红外探测器结构。关键词：Si／SiGe材料；空穴子带跃迁；量子级联激光器；量子阱红外探测器VAbstractPeoplehavewontmmendoussuccessesinsiliconmicroelectronictechnique，but，bu

2、lksilicon，withaindirectbandgaphasafiveorderofmagnitudelowerlightemissionefficiencythandirectbandgapmaterialssuchasGaAs．So。howtorealizehighlightemissionefficiencyofsilicon-basedmaterialsisoneoftheimportanttopicsconcemingthedevelopmentofsilicon—basedoptoelec

3、tronics．EnergybandengineeringbyusingtheintersubbandtransitioninSi／SiGequantumwellshasbeenrecognizedasoneofpromisingapproachestoachievementofefficientlightemissionfromsilicon-basedmaterials．Inlastfewyears，high-performancesilicon—basedmid-／far-infraredoptoel

4、ectronicdevicesattractedmoreattentioninacademeandindustry．Itisthereforetremendouslyimportanttocarryoutsuchworksfordevelopingscience，technologyandindustryfornationaldefenseinourcountry．Againstthismajorbackground，abasicstudyhasbeencarriedoutonSi／SiGequantumc

5、ascadelasersandSi／SiGequantumwellinfrareddetectorsbasedonholeintersubbandtransitions．ThemainworkandresultsaresummadzedasfoIlows：1．ThevalencebandstructuresandholeeffectivemassesofstrainedSi／SiGematerialsaresystematicallystudiedbyusingthe6x6k-pmethod．Holesoc

6、cupationinthehighlyBorondopedquantumwells，themomentummatrixelementsandopticalabsorptionofintersubbandtransitionbetweentwoholestateshavebeennumericallycalculated．2．TheenergybanddesignandoperationalmechanismofSi／SiGequantumcascadelasers(QCLs)atmid-／far-infra

7、red(terahertz)frequencyarediscussed．ByusingDrudemodelandFDTDmethod。highconfinementfactorofSi／SlGeQCLsworkatTHzfrequencyareobtainedwithlowlosscoefficients．3．Designsforstrainedp—typeSi／SiGequantumwellinfraredphotodetectors(QWlPs)basedonthebound—to-quasi—boun

8、dtransitionsarediscussed，thefigure—of-meritofthiskindofSi／SiGeQWlPshavebeedcalcuated．Weproposedontensilestrainedp-typeQWIPsforthefirsttime，whichareexpectedtoretaintheabilitytocouplenormallyincidentinfraredrad