The Study of Thermoelectric Thin Film with High Power Factor Based on Purified CNTs/Conductive Polymer Blends

Abstract

Applications of thermoelectric devices reveal that harvesting wasted heat and solar thermal energy into electricity have been anticipated to be renewable energy sources In this study the hybrid nanocomposites film is prepared that enable to convert the thermal heat into applicable electrical energy PEDOT:PSS known as exhibiting remarkable thermoelectric organic material had been employed further by introducing the highly conductive carbon nanotubes as the fillers which largely improve electrical conductivity (up to 5929 S/cm) without sacrificing Seebeck coefficient via nanoscale junction which is also believed to play an important role in filtering low energy electrons (Energy filtering effect) resulting in large power factor 1233 μWm-1K-2 at room temperature The mechanism of CNTs/PEDOT:PSS blends are also observed by analysis instruments explaining the reason how thermoelectric properties of conductive polymer film can be successfully improved by adding CNTs In addition applying electric and magnetic field to the nanocomposite film are further investigated revealing that thermal output power based on simple equipped I-V measurement could be amplified from 14 34 nW to 20 17 nW Furthermore we propose an idea that the optimized nanocomposite film is deposited on the one-dimensional silicon nanowire substrate established by metal-assisted chemical etching It is found that the output power and Seebeck coefficient are remarkably increased to 47 77 nW and 63 2 μVK-1 due to significant energy filtering effect created by energy barrier between nanoscale junction

Date of Award	2019
Original language	English
Supervisor	Chia-Yun Chen (Supervisor)