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1、LifePredictionforCIGSSolarModulesD.J.Coyle,H.A.Blaydes,R.S.Northey,J.E.Pickett,K.R.Nagarkar,R.A.Zhao,andJ.O.GardnerGEGlobalResearchNiskayuna,NY,12309DOEPVModuleReliabilityWorkshopDenver,COFebruary16-17,2011Onecanuseacceleratedtestingdatatopredictreal-worldmodulefailuresonlyifthedegradationme
2、chanismsareknownandtheirdependenceonenvironmentalfactorsmeasured.Themoisture-induceddegradationrateofflexibleCIGSsolarcellshasbeenmeasuredasafunctionoftemperatureandhumidityandfittoakineticrateexpression.Thisexpressioniscoupledtoamodelofmoisturediffusionintoapackageandtypicalmeteorologicalin
3、putdatatocreateacumulativedamagemodeltopredictlifetimeofpackagedcellsversusoutdoorexposureandpackageconstruction.Estimatedaccelerationfactorsfordampheat(85C/85%RH)vs.Miamirangefrom15Xto50X,dependingonthepackage,sincediffusionthroughthepackageisaccelerateddifferentlythanthecelldegradationkine
4、tics.Thedegradationratesarestronglydependentonthetransparentconductiveoxideusedforthewindowlayerandtheelectrically-conductiveadhesiveusedforthecontacts.Thedependenceofdegradationonencapsulantmaterialsisfundamentallydifferentthanisoftenassumedintheliterature.1DJCoyleGEGlobalResearch16-Februar
5、y2011PrototypeFlexibleCIGSModule2DJCoyleGEGlobalResearch16-February2011FlexibleThin-FilmPVPackageTopSheet?Transparent?UVStable,UVblock?Electricalinsulation?Mechanical(cut,hail)EdgeSeal?MoisturebarrierTransparentPolymerFilmTransparentMoistureBarrierEncapsulantEncapsulant?LowTcompliant“glue”TC
6、OgCdSPVCell?TransparentCIGS?AdhesionMolybdenumFlexibleSubstrate(StainlessSteel)BacksheetEncapsulant?ElectricalinsulationMoistureBarrier?Mechanical(cut)PolymerFilm?MoisturebarrierEdgeSeal?Barrier?Adhesion3DJCoyleGEGlobalResearch16-February2011Cu(InGa)SeDeviceEnvironmentalStability2Moisture-in
7、duceddegradationZnO/ITOIncreasedSeriesResistanceRsCdSi-ZnOBufferLayerDecreasedShuntResistanceRshCu(InGa)Se2μm2IncreasedRecombination1.Quasi-neutralregion2.DepletionregionMoIncreasedSeriesResistanceRs(W.Shafarman&L.Stolt,HandbookofPhotovoltaicScienc
