Device simulation of all-perovskite four-terminal tandem solar cells: towards 33% efficiency

Inorganic–organic hybrid perovskites offer wide optical absorption, long charge carrier diffusion length, and high optical-to-electrical conversion, enabling more than 25% efficiency of single-junction perovskite solar cells. All-perovskite four-terminal (4T) tandem cells have gained great attention because solution-processability potentially without a need for current-matching between subcells. To make the best use architecture, subcell bandgaps thicknesses must be optimized. This study presents drift-diffusion simulation model to find optimum device parameters 4T cell exceeding 33% efficiency. Optimized thicknesses, contact workfunctions, transport layer doping surface modification are investigated all-perovskite Also, using real material parameters, impact bulk interface traps is investigated. It observed that, despite recombination losses, can achieve very efficiencies broad range bandgap combinations. We obtained top bottom close 1.55 eV 0.9 eV, respectively. The thickness found about 250 nm 450 nm, Furthermore, we that in hole layers both subcells significantly improve present will provide experimentalists an with optimized bandgaps, subcells, high-efficiency