Abstract
The energy conversion efficiency in an exciton process, defined as the total energy density of excitons used for charge separation at the donor/acceptor heterojunction per incident optical power density, for organic solar cells, has been modeled on the basis of the rate processes for the charge separation of excitons into free charges at the heterojunction, the quenching of excitons at the organic layer/metal electrode interface, and the exciton diffusion in the bulk layer. As an application of this modeling, the energy conversion efficiency in the exciton process was analyzed for the CuPc/C60 heterojunction under various conditions. In this way, the upper limit of the energy conversion efficiency in the exciton process, under 1 sun (0.1 W/cm2) AM1.5 solar illumination, was estimated to be 7.4% for the optimized single heterojunction structure and approximately 40% for the optimized bulk heterojunction structure in which the donor and acceptor components are vertically aligned in the form of alternating donor/acceptor lamellae.
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