Energy Yield Modeling of Bifacial All‐Perovskite Two‐Terminal Tandem Photovoltaics

to a maximum of 40–50% for ground modeled as a perfect reflector ( R A = 100%), accompanied by a shift in optimum top subcell bandgap to 1.56 eV. This shift is of particular interest as low-bandgap perovskite semiconductors (with lower bromide concentrations) offer enhanced stability under realistic operation conditions. Finally, this work presents a route to increase the PCE of simulated monofacial and bifacial cells, to 31.9% and 30.8%, respectively, by optimizing the optical and electrical performance of the cells.