Crosslight_APSYS_APD_ag.pdf
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Crosslight_APSYS_APD_ag.pdf

Crosslight_APSYS_APD_ag.pdf

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ApplicationApplicationGuide:Guide:SimulationSimulationofofAvalancheAvalanchePhotodiodesPhotodiodesUsingUsingAPSYSAPSYSCopyright2006CrosslightSoftwareInc.www.crosslight.com12ContentsModelingofInP/InGaAsseparateabsorption,grading,$$charge&multiplication(SAGCM)APD.JInP/InGaAsSAGCMAPDstructureJSetupof.layerfileJSetupof.solfileJExcessnoisefactorFJSimulationresults$$ModelingofGaAs/AlGaAsPINAPD.JGaAsPINAPDstructureJSimulationresults$$Summary3InP/InGaAsSAGCMAPDstructureOnlycentralactiveregion.UsinggradinglayerbetweenInGaAs&InP.Use“new_doping”techniquetocircumventdivergenceproblematlowbias.4Setupof.layerfileThe.layerfilecanbesetupbyAPSYSLayerBuilder,ormodifiedfromexistingexamplefile.Threecolumnsdefined.Usegrad-inglayerattheheterointerface.Right-click.layerfileto“Processandgenerate.geo”atfirst.Right-click.geoto“Generatemesh”.Right-click.mpltto“Viewmesh”.Docheckmeshforanyirregularity.5Setupof.solfileThe.solfilecanbesetupupviamenu“Action\MainSimulation\Setup.sol”,oralterna-tivelymodifiedmodifiedfromexexistingistingexample.s.sololfile.Use“more_output”commandtoturnonmobility&impactionizationoutputforrelevantviewing&dataexport.export.Usecommand“use_macrofile”toconnecttheuser’sownmacrofileifnecessary.Toincorporateimpactionization,“impact_chynoweth”or“impact_baraff”commandlineshavetobeaddedforeachmaterNoin.materfile.ButactualimpactionizationsmostlyhappeninthehighelectricfieldInPmultipli-cationlayer.Mobilityvaluesforeachmaterialcouldalsobechangedusingcommandlines“electron(orhole)_mobilityvalue=***mater=***”inthe.solfile.Usetimedomainimpulseresponsetoevaluatethe–3dBbandwidth.6ExcessnoisefactorFExcessnoisefactorisusuallycalculatedvsgain.Chooseaseriesofbiasvoltages&obtaincorrespondinggainvalues.Seteachbiasvalueas“value_to=“inascan-line&runthe.solfiletogettheelectricfielddatafromthe.pltfilebyusingthecommandline“plot_1dvariable=field_ydata_file=***.dat”correspondingtothatscanline.Takeonlytheelectricfieldval