Thermoelectric Property Of PEDOT/PSS-HNTs Composite Films

In this thesis I report thermoelectric properties of the polymer composite films composed of the poly(3,4-ethylenedioxy thiophene)/poly(styrenesulfonate)(PEDOT/PSS) and the Halloysite nanotubes(HNTs). The polymer composite film, composed of 25 wt% of PEDOT/PSS treated with 7 wt% ethylene glycol and 75 wt% insulating HNTs, exhibited moderately high electrical conductivity and Seebeck coefficient, i.e., 58 S/cm and 19 μV/K at 300 K, respectively while quite low thermal conductivity, i.e., 0.16 W/m K at 300 K. The electrical conductivity and the Seebeck coefficient increased with increasing in temperature up to 378 K and showed good repeatability and stability in the measured temperature range. The ZT which is calculated using the thermal conductivity 0.16 W/m K, was 3.0 x 10-3 at 300 K, comparable with those of conventional conducting polymers.Here I also report thermoelectric properties of the polymer composte films which were treated with ammonium formate to dedope, and treated with polyethylene glycol and formic acid to induce flexibity and high conductivity. The results indicate that the films showed no significant improvement in the thermoelectric properties.Finally I report preliminary investigation on fabrication of solar cells by using P3HT/PCBM as active layers. Through the experiments I have mastered experimental techniques concerned with spin-coating, thermal treatment, vacuum deposition and envaluation of photovoltaic properties.