Optical transmission for each interface/material for each sub-cell. These calculations were performed for the top cell between 400 nm and 700 nm, for the middle cell between 700 nm and 900 nm, and for the bottom cell between 900 nm and 1700 nm. The output current of each sub-cell at a DNI of 1000 W/m² at 350×, with and without losses due to concentrating optics (reflection/absorption and metallization), corresponds to the two values on the right in red.