Carrier transfer in conducting polymer PEDOT:PSS films investigated by terahertz time domain spectroscopic ellipsometry

2016 Fiscal Year Final Research Report

• Project/Area Number: 26630140
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Electronic materials/Electric materials
• Research Institution: Institute of Physical and Chemical Research
• Principal Investigator: Yamashita Masatsugu 国立研究開発法人理化学研究所, 光量子工学研究領域, 上級研究員 (10360661)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: テラヘルツ分光 / エリプソメトリ / 導電性高分子 / キャリア伝導

Outline of Final Research Achievements

We have developed multi-angle of incidence terahertz time domain spectroscopic ellipsometry and applied it to study the anisotropic carrier transfer in conducting polymer PEDOT:PSS (poly(3,4 ethylenedioxythiophene):poly (styrensulfonate) ) films. By using the optical model describing the relation between the ellipsometric parameter and optical conductivity, we succeeded to numerically obtain the in-plane and out-of-plane optical conductivity of PEDOT:PSS films from the ellipsometric parameters measured at three different incident angle of terahertz waves. While the obtained frequency dependence of in-plane optical conductivity shows the presence of the conducting network with the weakly localized metallic state, that of out-of plane one indicates the variable hopping of carrier transfer between localized states.

Free Research Field

光物性