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Enhanced thermoelectric properties of two-dimensional conjugated polymers

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Abstract

Organic thermoelectric materials have drawn great attention in the past years. In this study, we report the thermoelectric properties of ferric salt bis(trifluoromethane)sulfonimide (TFSI−) doped two-dimensional (2D) conjugated polymer, poly[[4,8-bis[(5-ethylhexyl)thienyl]benzo[1,2-b;3,3-b]dithiophene-2,6-diyl][3-fluoro-2-[(2-ethylhexyl)carbonyl]thieno[3,4-b]thiophenediyl]] (PTB7-DT). It is found that the electrical conductivities of TFSI− doped 2D PTB7-DT are nearly 100 times larger than those of TFSI− doped one-dimensional (1D) corresponding conjugate polymer, poly[[4,8-bis[(2-ethylhexyl)oxy]benzo[1,2-b:4,5-b′]dithiophene-2,6-diyl][3-fluoro-2-[(2-ethylhexyl)carbonyl]thieno[3,4-b]thiophenediyl]] (PTB7) at the same doping levels. Moreover, TFSI− doped 2D PTB7-DT possess over 20 times larger power factor (79.8 μW/mK2) than that of TFSI− doped 1D PTB7. The enhancement of electrical conductivities of TFSI− doped 2D PTB7-DT is attributed to enhanced charge carrier densities and polaron densities. The studies of grazing incidence wide angle X-ray scattering further indicate that the π-π stacking distances of TFSI− doped 2D PTB7-DT along the in-plane direction are largely reduced compared to that of TFSI− doped 1D PTB7, which would facilitate the inter-chain and the intra-chain charge carrier transport, resulting in enhanced electrical conductivities. All these results demonstrate that 2D conjugated polymers are promising candidate materials for approaching high performance organic thermoelectric electronics.

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Acknowledgements

The authors at The University of Akron acknowledge National Science Foundation (EECS 1351785) and Air Force Office of Scientific Research (AFOSR) (through the Organic Materials Chemistry Program, Grant Number: FA9550-15-1-0292, Program Manager, Dr. Kenneth Caster) for financial supports.

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Authors and Affiliations

  1. Department of Polymer Engineering, College of Polymer Science and Polymer Engineering, The University of Akron, Akron, OH, 44325, USA

    Tianyu Meng, Chao Yi, Lei Liu, Alamgir Karim & Xiong Gong

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  1. Tianyu Meng
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  2. Chao Yi
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Correspondence to Xiong Gong.

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Meng, T., Yi, C., Liu, L. et al. Enhanced thermoelectric properties of two-dimensional conjugated polymers. emergent mater. 1, 67–76 (2018). https://doi.org/10.1007/s42247-018-0002-4

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