Environment Friendly Silicon Solar Cell Aluminium Paste

LEED LD7881X is an environmental Electronic aluminium paste developed to provide back contact metalization for solar cell, to mach with the TEC of silicon substrate well, it has the features of good print resolution, fine and smooth surface, high adhesion, low bow, energy conversion efficiency.Maintechnicalindicatorsandperformance1.Printing:Recommend250~325meshBOPPstainlesssteelscreen.Recommendviscosity:55-75Pa·Swhenusing280mesh,50-70Pa·Swhenusing300mesh.Stirringfor30minnearthebottomoftheverticalmixer,or6hinrollmixerbeforeuse.2.Controltheprintingwetweight:0.75-0.90gon125singlesilicon,1.20-1.50gon156polysilicon.3.Accordingtothewetweightabove-mentioned:Driedthickness:30-35μm.Firedthicknessis25-30μm4.Dryingtemperature(°C):Infraredstove,about3min,220-250°C.Quickstove,about24-30s,280-310°C.5.RecommendFiringtemperature(Despatchsinteringfurnace,theactualtemperatureofsiliconsubstratesurface):780-810°C6.ConversionEfficiency:125singlecrystalsilicon,averageconversionefficiency≥18.50%,156singlecrystalsilicon,averageconversionefficiency≥18.20%,156polysilicon,averageconversionefficiency≥17.00%.7.Alcoholwipetest:Cottonballmoistenedwithalcoholandwipethealuminumbacksurfacefield,noblackpowder.8.Warpage:125singlesilicon≤1.5mm,156single/polysilicon≤2.0mm9.Resistanttoboiling:Immersedcellsin70°Cdeionizedwaterby10min,takeoutandobserveAluminiumbacksurfacefield.Therearenon-white,blistering,sheddingandotherundesirablephenomena,aswellasnopowderoutornigrescencewipedbyalcohol.10.Adhesion:Laminatingfiredcells,gasha1cmwideEVAstrip.Tensiletestingismorethan10NandnosheddingonAluminiumbacksurface.11.Dampheattest:Keptinanenvironmentatatemperatureof85°C,humidityof85%for48hours,andatroomtemperatureafter4hours,thanobservetheAluminiumbacksurface.Therearenon-white,blistering,sheddingandotherundesirablephenomena.12.Thermalcyclingtest:Keptthecellsinanenvironmentatatemperatureof-40°C,humidityof60%for10min,thenheatedto85°Cthrough5hoursandretainedfor10minutes,temperaturechangeratebetweenhighestandlowestisnomorethan100°C/h.Thisisacycle.Thereisnosheddingorseriouscosmeticdefectsafter5cycles.13.Reliability:Aftercomposedtomodules,testitaccordingto"CrystallinesiliconterrestrialphotovoltaicmodulesIEC61215","PVmodulesafetycertificationIEC61730","flatphotovoltaicpanelsUL1703".Inthestandardtestconditions,themaximumoutputpowerattenuationmeetthestandardrequirements,noseriouscosmeticdefects.14.Thinner:Theviscosityisadjustedtogoodprintabilitywhenproduced.Itisnotrecommendedtoaddthethinner.soyoumustbeverycautioustoaddit,thenstirituniformly.15.Compatibility:Beforethemassproduction,youmusttestthecompatibilitybetweenAluminiumpasteandwafer,AgpasteandAluminiumpaste.16.Storage:Duringtransportationandstorageshouldprotectagainstthetideandcontamination.Containersmaybestoredinaclean,dryandstableenvironmentatroomtemperature(25(±5)°C),humidity≤60%RH,withtheirlidstightlysealedtoavoiddirectsunlight.Avoidacidcorrosionatmosphere,oil,dustparticlesatmosphere.Thealuminiumpaste'sshelflifeissixmonths.