Enhancing thermoelectric performance of diketopyrrolopyrrole-based conjugated polymers with efficient doping by longer thiophene groups
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초록
내용
Polymer backbone design suitable for efficient doping can provide new directions for improving charge transport and thermoelectric performance. Herein, a novel diketopyrrolopyrrole (DPP)-based conjugated polymer with eight thiophene groups in a repeating unit, EHT6-20DPP, was synthesized to enhance thermoelectric properties. Due to the extended thiophene groups as electron donating units, EHT6-20DPP shows higher doping efficiency with p-type dopant FeCl3 compared to other DPP-based polymers with shorten thiophene groups. The electrical conductivity and power factor of the doped EHT6-20DPP reached to maximum 93.28 S/cm and 56.73 μW/mK2, respectively. These values were found to be better than the reference DPP-based polymer with three thiophene groups in a repeating unit. A charge transport model was used to demonstrate the relationship between thermoelectric properties, indicating excellent charge transport properties of the doped EHT6-20DPP in terms of polymer backbone engineering.