First-order calculations of performance metrics of perovskite/Si tandem solar cells

The impressive optoelectronic properties of perovskite along with its optimal bandgap for application in a tandem solar cell has resulted in a lot of research interest in the field of perovskite/Si tandem solar cells. However, due to the lack of clarity of the design space optimization, the progress in the area is slow. In that context, here, we calculate the limiting performance metrics of perovskite/Si tandem solar cell as a function of active layers thicknesses and accordingly identify the optimum thicknesses of the active layer. Our results show that while the thickness of perovskite affects the performance of the device largely, the effect of the thickness of Si is nominal. Further, due to the increase in the two counter processes i.e., generation rate and recombination rate in the device with the thickness, there exist a pair of optimum thickness; and we elucidate the same. Indeed, our modelling methodology and results provide the direction for design space optimization of the perovskite/Si tandem solar cells.