Inthisstudy,wepresentanovel2 Tmonolithicpolymer/polymertandemsolarcell(TSC)modelbasedon experimentallyvalidatedsub-celldesignscomposedentirelyofOSC/OSCpolymers.Theindividualsubcellshavebeencalibratedagainstexperimentaldata,resultinginpowerconversionefficiencies(PCE)of 10.33%forthefrontcelland21.72%forthebackcell.ThelowercellcontainsaPM6:Y6activelayerinan ITO/Cu2O/PM6:Y6/SnO2/Agconfiguration,whiletheupperpolymercellisdesignedwithaconventional ITO/PEDOT:PSS/PM7:PIDT/PDINN/Agstructure,withPM7:PIDTastheabsorberlayer.Simulations wereperformedusingthe1DSCAPStooltoindividuallyoptimizetheperformanceofeachsub-cell. Extensiveinvestigationwascarriedoutonbandalignment,defectdensity,activelayerthicknessandthe selectionofelectronandholetransportlayers(ETLsandHTLs).Theeffectso ftemperature,shuntresistance andseriesresistanceonthetwosub-cellswerealsoanalyzedtoimprovestabilityandperformance.The resultingtandemstructureexhibitedashortcircuitcurrentdensity(JSC)of11.685 mA cm−2,anopencircuit voltage(VOC)of2.0721 V,afillfactorof82.823%andaPCEof20.054%,positioningitasapromising candidateforflexible,greenandhighlyefficienttandemsolarcells.Theseresultshighlightthepotentialof ourdesigntoadvancetheperformancebenchmarksoforganictandemsolarcells. Nomenclature table with units. Nomenclature Meaning Units HTL Hole Transport Layer ETL Electron Transport Layer Eg Energy Bandgap (eV) χ Electron Affinity (eV) ε Relative Permittivity Nc Effective Density of States in Conduction Band (1/cm3) Nv Effective Density of
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