Highly Improved Thermoelectric Performance and Doping Stability of Poly(3-hexylthiophene) by Dual Doping Effect
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초록
내용
The electrical conductivity and doping stability of poly(3-hexylthiophene)(P3HT) in atmosphere are significantly improved using a Lewis acid-based dopant. FeCl3 and AuCl3, which are representative Lewis acid-based dopants, are doped into the P3HT polymer by an identical redox reaction. The crystallographic and nanostructural investigations show that the remarkable effect of doping AuCl3 on the improved electrical conductivity and doping stability of P3HT originates from the coexistence of two different chemical states, AuCl4− and Au nanoparticles, in P3HT. P3HT doped with AuCl3 exhibits a considerably high electrical conductivity of 207 S·cm-1, a moderate Seebeck coefficient of 73.9 μV·K-1, and an optimized power factor of 110 μW·m-1·K-2. Finally, a flexible and organic thermoelectric generator (OTEG) is fabricated using the AuCl3-doped P3HT by slot-die coating.