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(a) Modeled exciton generation rate in the PBDTBDD:PC60BM active layer (100 nm) as a function of position within the active layer with Ca/Al and a-ZrAcac/Al cathode. (b) Calculated distribution of the normalized modulus squared of the optical electric field |E2| inside a photovoltaic device: ITO (~180 nm)/PEDOT (~30 nm)/PBDTBDD:PC60BM (~100 nm)/Ca (10 nm) or a-ZrAcac (11 nm)/Al (90 nm) for a wavelength of 430 nm.
