  Presented here is the optimization of a planar two-terminal
perovskite/silicon tandem solar cell with a texture structure. The developed
simulation model is fitted to published experimental results, and the
importance of current matching in the two-terminal structure is discussed. With
the texture structure optimized and considering current matching, the optimal
texture structure improves $J_{sc}$ from 17.9~mA/cm$^2$ to 20.87~mA/cm$^2$
compared to the planar structure, as well as improving the power conversion
efficiency from 25.8% to 35.9%. Furthermore, if the quality of the perovskite
thin film and tunneling junction efficiency with a smaller voltage penalty can
be improved, then the efficiency can be further improved to 38.13%. This
indicates that this tandem solar cell still has much room for improvement.
