Impact of bifaciality on EY for cell and module levels: (a) Bifacial gain at the radiative limit as a function of albedo for two different values of top cell band gap, revealing the vast increase and slower saturation of the benefits from bifaciality at reduced band gap. (b,c) Annual EY for the 1.6 eV band gap top cell, on cell level at fixed temperature, with temperature variation but no heating, module level EY at ambient temperature, module level with heating and under consideration of wind cooling, for the radiative limit and including non-radiative losses, respectively.