Proceedings of nanoGe Fall Meeting 2021 (NFM21)
DOI: https://doi.org/10.29363/nanoge.nfm.2021.102
Publication date: 23rd September 2021
Organic semiconductors are excellent candidates for low temperature thermoelectric generators. However, such thermoelectric applications require that the materials be doped and highly conductive.
Here, we show how doping affects the Seebeck coefficient in organic semiconductors using kinetic Monte-Carlo simulations. Employing a hopping transport approach we demonstrate that at high dopant loading, carrier-carrier interactions can reduce the Seebeck coefficient. This results in systems with intrinsic disorder still following Heike’s formula for thermopower at high dopant density. Reducing these carrier-carrier interactions results in an increased Seebeck coefficient and power factor. Specifically a realistic reduction in carrier-carrier interactions can increase the power factor by more than a factor 15, increasing ZT above 1 for organic thermoelectrics.
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