Abstract
The efficiency of optoelectronic devices, such as photovoltaics and sensors, are limited by the speed and direction of exciton propagation in their constituent materials. Organic semiconductors represent one of the most promising candidates for next generation photovoltaics, yet demonstrate extremely slow exciton transport. These processes, and in particular the role of phonons, are poorly understood. In this work, we use a fully microscopic manyparticle theory to model exciton transport in organic semiconductors. We find that the exciton diffusion is anisotropic, and that this anisotropy increases with increasing temperature. We predict that the magnitude of the diffusion is highly temperature dependent, decreasing by a factor of 2 from 77 K to 300 K. Our results are in good agreement with previous experimental studies and open ways for the control of exciton propagation in organic semiconductors.
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