Enhancing power conversion efficiency in inorganic lead-free tandem Perovskite solar cells: A simulation study

The current research paper presents the results of a simulation-based study on all-perovskite tandem multijunction devices using perovskites. The tandem structure considered in this study combines wide bandgap perovskites with 〖CsSnBr〗_۳ (bandgap ۱.۸ eV) as the top cell and Cs_۲ AuBiCl_۶ (bandgap ۱.۲ eV) as the bottom cell. . Additional features of this study include the projection of tandem solar cells using lead-free perovskites containing 〖CsSnBr〗_۳ and Cs_۲ AuBiCl_۶ .The effectiveness of the proposed tandem design is evaluated in two steps: first, we simulate a ۱.۸ eV perovskite-based top cell and tune the conversion efficiency to ۹.۸%. We then simulate a ۱.۲ eV perovskite-based bottom cell with a calibrated efficiency of ۱۳.۷%. After the standalone subcell calibration is completed, the tandem configuration is evaluated. The current matching condition between the top and bottom cells is determined by varying the thickness of the absorption layer of both subcells. The optimal thickness of the top cell is ۳۵۰ nm and the optimal thickness of the bottom cell is ۳۹۰ nm. When feeding the top and bottom cells with filtered spectra, the conversion efficiencies are ۹.۸% and ۷.۸۸%, respectively. Overall, the tandem design showed a conversion efficiency of ۱۸.۷%

کلیدواژه ها:

Perovskite ، Solar Cell ، SCAPS-۱D Simulator