Investigation of the thermoelectric response in conducting polymers doped by solid-state diffusion

K. Kang, S. Schott, D. Venkateshvaran, K. Broch, G. Schweicher, D. Harkin, C. Jellett, C.B. Nielsen, Iain McCulloch, H. Sirringhaus

Research output: Contribution to journalArticlepeer-review

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Thermoelectric effect is a physical phenomenon which intricately relates the thermal energy of charge carriers to their charge transport. Understanding the mechanism of this interaction in different systems lies at the heart of inventing novel materials which can revolutionize thermoelectric power generation technology. Despite the recent surge of interest in organic thermoelectric materials, the community has had difficulties in formulating the charge transport mechanism in the presence of a significant degree of disorder. Here, we analyze the thermoelectric properties of various conducting polymers doped by solid-state diffusion of dopant molecules based on a transport model with a power law energy dependence of transport function. A fine control of the degree of doping via postdoping annealing provides an accurate empirical evidence of a strong energy dependence of the carrier mobility in the conducting polymers. A superior thermoelectric power factor of conducting polymers doped by solid-state diffusion to that of other doping methods can be attributed to a resulting higher intrinsic mobility and higher free carrier concentration.
Original languageEnglish (US)
Pages (from-to)112-122
Number of pages11
JournalMaterials Today Physics
StatePublished - Mar 6 2019

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: The research leading to these results has received funding from the European Research Council under the European Union's Seventh Framework Programme (FP7/2007-2013)/ERC grant agreement no. 610115. K.K. thanks the financial support from Samsung Scholarship Foundation and the National Creative Research Laboratory program (Grant No. 2012026372) through the National Research Foundation of Korea, funded by the Korean Ministry of Science and ICT. K.B. acknowledges funding by the German Research Foundation (BR 4869/1-1). G.S. acknowledges postdoctoral fellowship support from the Wiener-Anspach Foundation and The Leverhulme Trust (Early Career Fellowship supported by the Isaac Newton Trust). The authors thank S. Watanabe of the University of Tokyo for the help with device fabrication.


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