Enhanced doping efficiency and thermoelectric performance of diketopyrrolopyrrole-based conjugated polymer with extended thiophene donors
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The design of polymer backbones suitable for improving doping efficiency can provide a new direction in enhancing charge transport and thermoelectric performance. However, their optimizations are still unclear. Herein, the synthesis of a new diketopyrrolopyrrole (DPP)-based conjugated polymer with eight thiophene groups in a repeat unit, EHT6-20DPP, was reported for the improvement of thermoelectric properties. Compared to other DPP-based polymers with a different number of thiophene groups, EHT6-20DPP exhibits higher doping efficiency when doped with a p-type dopant, FeCl3, owing to its higher number of thiophene groups as electron donating units. The optimum electrical conductivity and power factor of the doped EHT6-20DPP were found to be 93.28 S cm−1 and 56.73 μW m−1 K−2, which are higher than the reference DPP-based polymer with three thiophene groups in a repeat unit.