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Thispaperpresentsanexperimentalmethodformeasuringthedensityoftrappingcharges.Thismethodisbasedonthedy namicequilibriumequationfortheprocessoftrappedcharges.WecanobtainthedensityandthelocationoftrappingchargesbymeasuringthehighfrequencyC VcurveofMOScapacitancebeforeandafterstress,andthechangeofgatevoltageunderconstantcurrentstress.Theanalyticalexpressionofthedensityoftrappingchargesisproposed .Themethodandtheresultsofparametersextractionarealsopresented .Experimentalresultsshowthatthismethodisconvenientandprecise .







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