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Investigation of organic thermoelectric materials using potential‐step chronocoulometry: Effect of polymerization methods on thermoelectric properties of poly(3‐hexylthiophene)
Author(s) -
Imae Ichiro,
Akazawa Ryosuke,
Ooyama Yousuke,
Harima Yutaka
Publication year - 2020
Publication title -
journal of polymer science
Language(s) - English
Resource type - Journals
eISSN - 2642-4169
pISSN - 2642-4150
DOI - 10.1002/pol.20200506
Subject(s) - thermoelectric effect , materials science , doping , seebeck coefficient , thermoelectric materials , polymerization , polymer , electrical resistivity and conductivity , conductive polymer , analytical chemistry (journal) , chemical engineering , optoelectronics , composite material , thermodynamics , chemistry , organic chemistry , thermal conductivity , electrical engineering , physics , engineering
To establish the correlation between the thermoelectric properties of conducting polymers and their doping levels, we have utilized the potential‐step chronocoulometry for the quantitative estimation of the doping levels. In this paper, three types of poly(3‐hexylthiophene)s synthesized by different polymerization methods were investigated. The electrical conductivities and the Seebeck coefficients of poly(3‐hexylthiophene)s with various doping levels were measured and plotted against the doping level. It was found that the electrical conductivity linearly increased with increasing the doping level in the range of 1–10%, and then saturated. On the other hand, the relationship between the Seebeck coefficient and the doping level showed a good linearity in all the polymers.