Proceedings of nanoGe Fall Meeting 2021 (NFM21)
DOI: https://doi.org/10.29363/nanoge.nfm.2021.154
Publication date: 23rd September 2021
Organic semiconductors are exciting candidates for organic thermoelectrics due to their low cost, abundant constituting elements, and, intriguingly, an assumed and overlooked low thermal conductivity. Therefore, research focuses primarily on improving the electronic contribution of the thermoelectric figure of merit ZT through processes like electrical doping and modification of the structural order. However, it is not clear how these processes affect thermal conductivity, and a mere handful of publications have explored this subject. Here we present a high-throughput methodology based on annealing- and doping-gradients to analyze and correlate the electrical and thermal conductivity. We can obtain data equivalent of > 100 samples using a single polymer film through this approach. As a testbed for our experiments, we employ poly(2,5- bis(3-alkylthiophen-2-yl)thieno[3,2-b]thiophene) (PBTTT) and the dopant 2,3,5,6-tetrafluoro-7,7,8,8-tetra-cyanoquinodimethane (F4TCNQ). We show that doping in PBTTT does not deteriorate the crystalline quality of the film but reduces thermal conductivity by a factor of two, even at relatively low doping levels. Our results indicate that the lattice contribution of the system dominates thermal transport and that impurities within the polymer network can have a drastic effect on the total thermal conductivity.
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