Life Prediction for CIGS Solar Modules

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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