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SCAPS-1D software ignores optical losses and recombination junction (RJ)layer in studying tandem solar cells (TSCs). This paper presents anoptoelectronic study of a perovskite/Silicon TSC, comparing the effects ofusing two different methods of calculating filtered spectra on the photovoltaicperformance parameters of tandem device. It is shown that integrating transfermatrix (TM) method into SCAPS-1D addresses per-layer optical losses andprovides a platform for optimizing the RJ layer in TSCs. Using Beer-Lambert(BL) method for calculating the filtered spectra transmitted from theperovskite top sub-cell is revealed to overestimate the cell efficiency by ~4%,due to its inability to fully address optical losses. Also, the BL method failsto tackle any issues regarding optical improvement through ITO ad-layer on theRJ. Using TM formalism, the efficiency of the proposed perovskite/Silicon TSCis shown to be increased from 19.81% to 23.10%, by introducing the ITO ad-layeron the RJ. It is the first time that the effect of filtered spectrumcalculation method is clearly investigated in simulating TSCs with SCAPS-1D.The results pave the way to introduce the optical loss effects in SCAPS-1D anddemonstrate that the BL method that has been used before needs to be revised.

Integrating transfer matrix method into SCAPS-1D for addressing optical  losses and per-layer optical properties in perovskite/Silicon tandem solar  cells