NIMSAWARD2025-abstracts

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P1-2158Boosting the Efficiency and Stability of Pb-Sn Mixed Perovskite Solar Cells by Anhydride Additive StrategyKey Words: Pb-Sn mixed perovskite, additive engineering, VOCdeficit, defect passivation Perovskitesolarcells(PSCs)seektofulfilltheurgentworldwideneedforclean,economicalandsustainableenergy.Enhancingtheefficiency,stabilityanddurabilityofsolarcellsaidsinreducingrelianceonfossilfuels,decreasingenergyexpensesandfacilitatingaccesstorenewableenergy.Thisworkaidsinaddressingclimatechange,enhancingenergyaccessibilityinoverlookedareasandpromotingeconomicdevelopmentthankstogreentechnologyinnovation.⚫TMAHmodificationsignificantlyimprovesfilmcrystallinity,airstabilityandreducesdefectdensity.⚫Notably,VOClossaslowas0.37Visobtainedalongwithahighfillfactor81%.⚫TheoptimizedPSCsachievedaPCEof22.93%.ConclusionResult and DiscussionResult and Discussion⚫InvestigatealternativeorganiccationsforimprovedVOCdeficitanddefectpassivation.⚫Optimizeinterfacestoenhanceenergylevelalignmentandfacilitateefficientchargetransport.⚫Scaleupfabricationforreal-worlduse.Future PlanIntroductionInPb-SnmixedPSCs,VOClossstillstrugglestofallbelow0.4V,indicating56%higherthanthetheoreticalvalueof0.25V.Poorcrystallizationandelevatednon-radiativerecombinationleadtolowFFandVOCloss.Toaddressthoseissues,TMAHchelatesundercoordinatedPb²⁺/Sn²⁺via-C=O/-COO⁻groupsthroughelectrontransfer,improvingcrystalgrowthandreducingnon-radiativerecombinationbymatchingproperinterfacialcontact,resultinginhighFFandVOC.Theme underDiscussionPhotovoltaic Materials Group, GREEN Md Ataur RahmanE-mail：： s2430091@u.tsukuba.ac.jp(b)(a)Fig.(a)ChemicalstructureofTMAHanditshydrolysisproductTrimelliticAcid(TMA)afterreactionwithwaterandElectrostaticsurfacepotential(ESP)mapofTMAH.(b)Perovskitefabricationprocess(C60,BCPandAgaredepositedbythermalevaporation).Fig.(a)DevicestructureandSchematicillustrationfortheperovskitefilmmodifiedbyTMAHandTMA,(b)ChampionJ-Vcurvesofdevicestreatedwith/withoutTMAH.(c)Cross-sectionSEMimagesofperovskitetreatedwith/withoutTMAH.PristineTMAH-treated(a)(b)(c)Fig.XPSspectraof(a)pristineand(b)TMAH-treatedperovskitefilms.(c)PLand(d)TRPLspectraofpristineandTMAH-modifiedperovskitefilms.(e)SCLCgraphofelectron-onlydeviceand(f)SchematicenergyleveldiagramsofpristineandTMAH-treatedperovskitefilms.(a)(b)(c)(d)(e)(f)(a)(c)(d)Fig.(a)Watercontactangleandphotographsofperovskitefilmsaginginair(RH805%).(b)XRDspectraofperovskitefilmsbeforeandafteraginginair.(c)&(d)SEMimagesofperovskitefilmsafter360hoursaginginair.(e)StabilizedPCEofchampiondevice.(e)Aged-360 hrsAged-360 hrsPristineTMAH-treated22.47%(b)Sn 3d5/2Sn 3d5/2moisturemoisture