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Polymer morphology and interfacial charge transfer dominate over energy-dependent scattering in organic-inorganic thermoelectrics
Date
2018-12-17
Author
Kumar, Pawan
Zaia, Edmond W.
Yıldırım, Erol
Repaka, D. V. Maheswar
Yang, Shuo-Wang
Urban, Jeffrey J.
Hippalgaonkar, Kedar
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This work is licensed under a
Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License
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Hybrid (organic-inorganic) materials have emerged as a promising class of thermoelectric materials, achieving power factors (S-2 sigma) exceeding those of either constituent. The mechanism of this enhancement is still under debate, and pinpointing the underlying physics has proven difficult. In this work, we combine transport measurements with theoretical simulations and first principles calculations on a prototypical PEDOT:PSS-Te(Cu-x) nanowire hybrid material system to understand the effect of templating and charge redistribution on the thermoelectric performance. Further, we apply the recently developed Kang-Snyder charge transport model to show that scattering of holes in the hybrid system, defined by the energy-dependent scattering parameter, remains the same as in the host polymer matrix; performance is instead dictated by polymer morphology manifested in an energy-independent transport coefficient. We build upon this language to explain thermoelectric behavior in a variety of PEDOT and P3HT based hybrids acting as a guide for future work in multiphase materials.
Subject Keywords
General Biochemistry, Genetics and Molecular Biology
,
General Physics and Astronomy
,
General Chemistry
URI
https://hdl.handle.net/11511/48180
Journal
NATURE COMMUNICATIONS
DOI
https://doi.org/10.1038/s41467-018-07435-z
Collections
Department of Chemistry, Article