[14a-P5-1~24] 12.3 Functional Materials and Novel Devices

[14a-P5-17] Ionic Doping of Amorphous Semiconducting Polymers toward Flexible Thermoelectric Materials

〇MOTOHIRO NAKANO^1,2, Shrayesh Patel³, Anne Glaudell^2,3, Michael Chabinyc^2,3, Yoshiyuki Nonoguchi¹, Tsuyoshi Kawai¹ (1.Graduate School of Materials Science, NAIST, 2.Materials Department, UCSB, 3.Materials Research Lab., UCSB)

Keywords:organic semiconducting polymer, ionic doping, thermoelectric meterials

We have studied the influence of electrical doping on the electrical conductivity and thermoelectric (TE) effects of PTAA (polytriarylamine) to determine if this model system is well described by hopping theories of conduction. We electrically doped PTAAs with metal salts with varying anions. From UV-Vis-NIR spectroscopy, we observed new absorption peaks at about 500 nm and the NIR region. We attribute these spectral changes to the formation of polaron states onto the main chain of PTAAs. This doped material was stable in air for several weeks. Differential scanning calorimetry thermograms revealed that a new melting peak in doped PTAAs compared to pristine ones demonstrating a significant structural change and the potential for simple processing of these conductive materials. This doping technique will be a promising candidate for organic TE materials.