半导体材料和应用ppt课件

.,1,Thedevelopmentandapplicationofsemiconductormaterials,.,2,Outline,1，Backgroundintroduction2,Thesimpleprincipleofsemiconductormaterials3,Theperformanceofsemiconductormaterials4,Applicationandadvantagesofsemiconductormaterials5,Prospectsforthedevelopmentofsemiconductordevices,.,3,Background,In1947,thefirsttransistorwasinventedbyJohnBardeenandWalterBrattaininBelllabs.In1954,thefirstsolarcellwasinventedbyChapinBelllabs.In1958-1959，asimpleintegratedcircuitcameouttothepublicIn1962,Hallinventedthefirstsemiconductorlaser,.,4,Thesimpleprincipleofsemiconductormaterials,asubstanceasgermanium(锗)orsilicon（硅）whoseelectricalconductivityisintermediatebetweenthatofametalandaninsulator.,.,5,Theperformanceofsemiconductor,itsconductivityincreaseswithincreasingtemperatureandinthepresenceofimpurities.Photovoltaiceffect.photoconductiveeffect.UnidirectionalConductivity.,.,6,Applicationandadvantagesofsemiconductormaterials,solarcellsLightEmittingDiode(LED)integratedcircuit(IC)semiconductorlaser,.,7,Whenthesolarcellsurfaceexposedtothelight,makingtheelectronstransition,gatheringtoformapotentialdifferenceonbothsidesoftheP-Njunction.,solarcells,.,8,advantages:1),Solarpowerisnon-polluting2),Thelightandenergyfromthesunisfree3),Solarcellsrequireverylittlemaintenance4),solarpowerissilentpowered,.,9,LED,LEDconvertselectricalenergyintolight.advantages:ledlightingwithenergyefficient,low-carbonenvironment,smallsize,highstrength,lowvoltagedrive,highstabilityofthelamp,highwaterproof,etc,.,10,integratedcircuit,Theadvantagesofintegratedcircuitsasfollows:smallsize,lightweight,longlife,highreliabilityandperformance.,.,11,semiconductorlaser,comparedtotheOrdinarylaser，advantages：1），longerlife，2），smallersize，3），Lessconsumptionofelectricity4），Higherefficiency,.,12,Prospectsforthedevelopmentofsemiconductordevices,someproductionsshowingthesemiconductorusedindifferentareas,.,13,summary,Thesimpleprincipleofsemiconductormaterial,Applicationandadvantagesofsemiconductormaterial,Prospectsforthedevelopmentofsem