This work presents the design of a monolithic thin-film tandem solar cell (TSC), that comprises
of a front perovskite (PVK) sub-cell along with a rear thin Si sub-cell. The study
begins by calibrating the individual sub-cells versus experimental studies, resulting in a
power conversion efficiency (PCE) of 12.70% regarding the front cell and 24.47% regarding
the rear cell. When combining the two sub-cells in a PVK/Si configuration, the initial
tandem achieves an efficiency of 22.36% and a short-circuit current density (Jsc) of
15.29 mA/cm2. To enhance the functionality of the proposed TSC, we design the top hole
transport layer to achieve a suitable valence band offset and inspect the influence of altering
the defect concentration of the front sub-cell absorber and the thicknesses of both absorbers
to maximize the PCE. The optimized TSC, under the current matching circumstance,
shows an improved Jsc of 19.25 mA/cm2 and a PCE of 32.25%. All performed simulations
are conducted by employing a Silvaco Atlas device simulator with one Sun spectrum illumination
(AM1.5G, 1000 W/m2). This TCAD simulation study offers potential ways to
advance low-cost, efficient thin-film TSCs that are suitable for flexible applications.