Optimization of the structure of bilayer organic solar cells based on light intensity distribution and quantity of effective excitons

The light intensity distribution inside organic solar cells is described by optical propagation matrix and the quantity of effective excitons is defined in this paper. The quantity of effective excitons describes the total intensity near the donor/acceptor interface, which can contribute to the generation of holes and electrons. The optimum structure then can be obtained by maximizing this parameter. In this paper, CuPc/C₆₀ structure is taken as an example. It is found the optimum structure is CuPc(15nm)/C₆₀(40nm). The verification experiments are established and only 5nm error appears in the thickness of CuPc.