光衰减与少子寿命

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1、SolarEnergyMaterials&SolarCells75(2003)351–356Interpretationoflight-inducedcellperformancedegradationbymeansofspectroscopiclightilluminationH.Hashigami*,Y.Itakura,T.SaitohTokyoUniversityofAgricultureandTechnology,2-24-16,Nakacho,Koganei,Tokyo184-8569,

2、JapanAbstractLight-inducedcellperformanceandlifetimedegradationareinvestigatedusingblueandredlightilluminationsinordertoclarifytheresponsiblefactorforthemetastabledefectactivation.Theevaluationofthecell-performancedecaycurveswithexponentialdecayfitting

3、sresultsinthesamedecaytimeconstantsforthedegradation.Spectralresponsedegradationisinvestigatedunderblue-lightillumination.Onlythedecreaseinredresponseindicatesdeepdistributionoftheactivatedmetastabledefectintothebulk.Injectedcarriersareresponsiblefort

4、hedefectactivation.Carrierdiffusionlengthsofmorethan100mminacellatadegradedstateisconsideredtomakebluelightpossibletodegradethebulk.r2002PublishedbyElsevierScienceB.V.Keywords:Czochralskisilicon;Solarcell;Degradation;Defects1.IntroductionRecentresearc

5、hhasfoundimportantfundamentalsoflight-inducedminoritycarrierlifetimedegradationonboron-dopedCz–Si.Strongcorrelationbetweenboronandinterstitialoxygenwasfound[1],andatthesametime,effectivesolutionstoavoidthedegradationwereprovided[2,3].Dataanalysiswitht

6、heSRHtheorypointedoutaprobableenergyrangeofthedeeplevelconsistedofB–Oicomplex[4].However,averylowdefectconcentrationmakesfurtheridentificationdifficult.Thoughacompleteexplanationforthedegradationhasnotbeencarriedoutyet,Bourgoinetal.proposedametastablede

7、fectmodelwithJahn–Tellerdistortioneffect[5].Themodelassumesthatinjectedcarriersinducethedegradation.The*Correspondingauthor.0927-0248/03/$-seefrontmatterr2002PublishedbyElsevierScienceB.V.PII:S0927-0248(02)00179-4352H.Hashigamietal./SolarEnergyMateria

8、ls&SolarCells75(2003)351–356assumptionissupportedbythefactthatforwardvoltageapplicationtoaCz–Sicellinthedarkdegradestheperformancesimilarlytothelight-induceddegradation[6].Thefactorforthemetastabledefectactivationisacriticalpointandshouldbespe