P1-2057ZnO-Induced Instability in Perovskite Solar Cells Suppressed by Chelating AgentsKey Words: perovskite solar cell, decomposition, chelating agent. •Highefficiency,stability,andlow-costrenewableenergysolutionscanbeachievedbyimprovingtheZnOelectrontransportlayer(ETL)inorganic–inorganicperovskitesolarcells(PSCs).•ZnOexperiencesdecompositionattheZnO/perovskiteinterfaceduetosurface-OHgroupsandinterstitialZn²⁺ions,whichimpairschargecollectionandshortensdevicelifetime.⚫ThepassivationofZnOusingchelatingagentseffectivelypreventedthedegradationofPVKattheZnOETL/PVKinterface⚫ZnO/GlyAcidoutperformsZnO/GlyHCl,boostingelectronextraction,loweringrecombination,andreaching23.10%PCE.ConclusionResults and Discussion⚫TheuseofSpiro-OMeTADastheholetransportlayer(HTL)limitsthelong-termstabilityofourdevices;morestableHTLalternativeswillbeinvestigatedinfutureresearch.Future PlanIntroduction•Glycolicacid(GlyAcid)andglycinehydrochloride(GlyHCl)effectivelypassivatedtheZnOsurfacethroughthesuppressionof-OHgroupsandtheformationofmetalcomplexeswithinterstitialZn2+.•PassivationwithGlyAcid,comparedtoGlyHCl,enhancesthermalstabilityandchargeextraction,attainingthehighestPCEof23.10%forZnO-basedPSCs.Theme underDiscussionPhotovoltaic Materials Group, GREEN FerdousPJannatulE-mail：： FERDOUS.Jannatul@nims.go.jpFig.a)ReactionofZnOwithGlyHClandGlyAcidb)FTIRspectrac)SchematicrepresentationofGlyAcidwithZnOinn-i-pstructure.Zn(OH)2(31.62%)ZnO(68.38%)Zn(OH)2(17.05%)ZnO(82.95%)Zn(OH)2(6.72%)ZnO(93.28%)ZnOZnO/GlyHClZnO/GlyAcidFig. Deconvoluted XPS spectra.ZnO/ PVKZnO/GlyAcid/PVKZnO/GlyHCl/PVKFig. SEM images of PVK filmsa)b)c)Fig.a) XRD b) PLc) TRPL of PVK films.Fig.Time dependent XRD of PVK films.Fig.a) J–V b) IPCE curve.a)b)ETLJSC(mA/cm2)VOC(V)FF(%)PCE(%)ZnO/GlyHCl22.691.1080.9020.19ZnO/GlyAcid23.941.1683.1423.09
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