Textured All-Perovskite Tandem Solar Cells – a Numerical Study

In this contribution we study numerically, how sinusoidal nanotextures would affect the (optical) performance of all-perovskite tandem solar cells. The simulations are conducted with the finite element method (FEM) and consider solar cells in glass superstrate configuration. We correct for the multiple interactions between light that is reflected from the solar cell stack and the glass-air interface with an iterative scattering-matrix approach. To achieve current matching, we optimize the perovskite thickness of the top cell using the Newton method. Results show that front texturing improves the photocurrent density with respect to the planar reference. Additional texturing between top and bottom cell hardly improves the performance. Full texturing leads to an increased photocurrent density, which can mostly be attributed to light trapping at the absorption edge of the bottom cell. Our study shows how texturing can help to further increase the efficiency of all-perovskite tandem solar cells.