Enhancement of Thermoelectric Properties in Conjugated Polymers through Nanowire Formation and Molecular Doping
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초록
내용
Nanostructures are widely employed in nano-optoelectronics due to anisotropic properties and excellent charge transport. In this study, we prepared nanowires of conjugated polymers (CP NWs) to study the effect on doping efficiency and thermoelectric performances. CP NWs (P3HT NWs) were fabricated by solution process and sequentially doped by molecular dopant (F4-TCNQ). Doped CP NWs exhibited high electrical conductivity up to 90.9 S/cm, much higher than reference P3HT films (29.9 S/cm). Optical and electrical characterizations revealed that high density diffusion of dopant by porous structure and one-dimensional charge transport enhanced doping efficiency and mobility, resulting in excellent conductivity. Moreover, porous structure reduced thermal conductivity of CP NW films and enabled improved thermoelectric ZT values compared to reference films. Finally, taking advantage of NW flexibility, we demonstrated high power factor bendable thermoelectric devices using CP NWs.