標題: | Enhanced Thermoelectric Performance of PEDOT:PSS Flexible Bulky Papers by Treatment with Secondary Dopants |
作者: | Mengistie, Desalegn A. Chen, Chang-Hsiao Boopathi, Karunakara M. Pranoto, Ferry W. Li, Lain-Jong Chu, Chih-Wei 光電工程學系 Department of Photonics |
關鍵字: | PEDOT:PSS;conductivity enhancement;flexible thermoelectrics;Seebeck coefficient;power factor;conductive polymer |
公開日期: | 14-一月-2015 |
摘要: | For inorganic thermoelectric materials, Seebeck coefficient and electrical conductivity are interdependent, and hence optimization of thermoelectric performance is challenging. In this work we show that thermoelectric performance of PEDOT:PSS can be enhanced by greatly improving its electrical conductivity in contrast to inorganic thermoelectric materials. Free-standing flexible and smooth PEDOT:PSS bulky papers were prepared using vacuum-assisted filtration. The electrical conductivity was enhanced to 640, 800, 1300, and 1900 S cm(-1) by treating PEDOT:PSS with ethylene glycol, polyethylene glycol, methanol, and formic acid, respectively. The Seebeck coefficient did not show significant variation with the tremendous conductivity enhancement being 21.4 and 20.6 mu V K-1 for ethylene glycol- and formic acid-treated papers, respectively. This is because secondary dopants, which increase electrical conductivity, do not change oxidation level of PEDOT. A maximum power factor of 80.6 mu W m(-1) K-2 was shown for formic acid-treated samples, while it was only 29.3 mu W m(-1) K-2 for ethylene glycol treatment. Coupled with intrinsically low thermal conductivity of PEDOT:PSS, ZT approximate to 0.32 was measured at room temperature using Harman method. We investigated the reasons behind the greatly enhanced thermoelectric performance. |
URI: | http://dx.doi.org/10.1021/am507032e http://hdl.handle.net/11536/124381 |
ISSN: | 1944-8244 |
DOI: | 10.1021/am507032e |
期刊: | ACS APPLIED MATERIALS & INTERFACES |
起始頁: | 94 |
結束頁: | 100 |
顯示於類別: | 期刊論文 |