Tuning Thermoelectric Properties through Side Chains Engineering of Conducting Polymers
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초록
내용
Thermoelectric generators are energy-harvesting devices that can convert dissipated heat into electrical energy by the thermoelectric effect through Seebeck effect. Chemical doping arouses several obstacles such as phase separation, difficulty in precise control of doping concentrationin and in-situ investigations of the transport and TE properties while doping. Here in, we have synthesized series of PPDT2FBT based polymers PPDT2FBT-A12, A14, and A18 with different length of oligo-ethylene glycol side chains, and investigated their TE properties using organic electrochemical transistor architecture which allowed precise monitoring of doping level through voltage control. PPDT2FBT-A12 exhibited the highest electrical conductivity (∼28 S cm-1) after electrochemical doping while PPDT2FBT with alkyl side chain showed that of ∼22 S cm-1. The PF of PPDT2FBT-A12 was measured to be 50 times higher compared that of PPDT2FBT (2.5 vs 0.05 μW m-1 K-2).