Fig. 3
From: Developing design criteria for organic solar cells using well-absorbing non-fullerene acceptors
Simulation with ideal collection and absorption properties. Contour plot of the efficiency η of a solar cell with ideal collection properties and ideal, step-like absorptance astep(E), as a function of its band-gap energy Eg and the external LED quantum efficiency QLED, which is linked by the reciprocity relation with the non-radiative recombination losses. The white line indicates the ideal band gap as a function of QLED showing that the higher the losses, the larger this ideal band gap and the lower the maximum efficiency of the solar cell that can be achieved. The black lines mark equipotential lines at efficiencies of 20, 25, and 30%
