Additional power (in percentages) due to the bifaciality of the bottom cell in comparison to the same tandem module applied monofacially assuming rear injection of 135 W/m² with STC front, and equal single junction device efficiencies at STC. The transparency of the perovskite is bottom cell efficiency/single junction efficiency ratio. The bifaciality of the silicon cell is for the silicon cell as component. This graph provides a visual representation of the justification of bifacial tandems. Note the square in the graph denotes common distribution of bifaciality and transmission.