Investigating ASnI2Br wide bandgap tin perovskite for bifacial solar cells: Modeling of bifacial efficiency with comparative analysis

[Display omitted] •First investigation of ASnI2Br perovskite solar cells, achieving 21.94% PCE under rear-side illumination.•Explores three methods to estimate bifacial efficiency (ηbi): characteristics addition (CA), generation addition (GA), and mathematical modeling (MM).•Validates methods using a baseline model calibrated with experimentally verified bifacial solar cells.•Maximum ηbi reaches 28.75% (CA) and 30.17% (GA) under 100 mW cm-2 front- and 50 mW cm-2 rear-side illumination.•Optimum ηbi of 31.05% achieved using tile as the rear surface material with GA. In this study, a novel perovskite bifacial solar cell featuring ASnI2Br as the absorber material, with the A-site cation represented by EDA0.01(GA0.06(FA0.8Cs0.2)0.94)0.98, was proposed. For the first time, the power conversion efficiency (PCE) of such a structure, achieving a notable 21.94% with rear-side illumination, was obtained. Additionally, the first investigation into three distinct methods for estimating the bifacial efficiency (ηbi) of wide bandgap tin-perovskite bifacial solar cells, namely, characteristics addition (CA), generation addition (GA), and mathematical modeling (MM), was implemented. To validate the efficacy estimated by these methods, we apply them to an additional baseline model calibrated extensively with an experimentally verified bifacial perovskite solar cell (PSC) exposed to concurrent front- and rear illumination. Our findings indicate that the CA and GA methods outperform the MM, with the GA method closely aligning with experimental bifacial PSC parameters. Opting for the superior GA method, our analysis showed that the estimated ηbi of the proposed device is 30.17% under 100 mW cm−2 front-side and 50 mW cm−2 rear-side illumination intensity. Furthermore, the ηbi of the proposed device was evaluated under various experimentally calculated rear-side surface spectra, revealing an optimum ηbi of 31.05% when the tile was used as the rear surface material.