Influence of non-perfect mirror at the back side of the FC in systems with a coverage fraction f = 0.01. (a) Side-mounted solar cells. Inclusion of non-radiative losses in the dye decreases the photon collection significantly. The relative deterioration in a system with applied PBS is higher than in the system without PBS. (b) Bottom-mounted solar cells. At small l/d the system shows a similar behavior as the side-mounted system.