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Low-cost and sustainable organic thermoelectrics based on low-dimensional molecular metals

Strohriegl, Peter; Huewe, Florian; Steeger, Alexander; Kostova, Kalina; Burroughs, Laurence; Bauer, Irene; Strohriegl, Peter; Dimitrov, Vladimir; Woodward, Simon; Pflaum, Jens

Authors

Peter Strohriegl

Florian Huewe

Alexander Steeger

Kalina Kostova

Laurence Burroughs

Irene Bauer

Peter Strohriegl

Vladimir Dimitrov

Simon Woodward simon.woodward@nottingham.ac.uk

Jens Pflaum



Abstract

More than 70 % of the primary energy consumed world-wide is wasted, mostly as heat below 100 °C[1]. Thermoelectric generators may convert a substantial amount of this energy into electrical power but high production costs and scarcity of efficient thermoelectric materials operating in this temperature regime have limited large-scale applications so far. Recently, conducting polymers have been proposed as potential candidates to meet these challenges showing appreciable low-temperature thermoelectric performance, but unfortunately suffering from low electrical conductivity due to inherent disorder[2–5]. Herein, crystalline low-dimensional molecular metals are demonstrated as an alternative class of thermoelectric materials combining the advantages of low weight, chemical variety, sustainability and high charge carrier mobility with reduced electronic dimensionality. For the first time determining all relevant thermoelectric quantities on individual organic crystals of both, p-type TTT2I3 and n-type DCNQI2Cu conductors, high power factors and promising figures of merit surpassing values of zT≥0.15 below 40 K are disclosed in this study. The cost-defining power output per active area of a prototypical, all-organic TEG takes unprecedented values of ~mW/cm2 at RT. Violation of the Wiedemann-Franz law and phonon drag effects emerge from the materials’ low-dimensionality and are expected to deliver further thermoelectric enhancement feasible in near future.

Journal Article Type Article
Publication Date 2017-04
Journal Advanced Materials
Print ISSN 0935-9648
Electronic ISSN 1521-4095
Publisher Wiley
Peer Reviewed Peer Reviewed
Volume 29
Issue 13
Pages 1605682
APA6 Citation Dimitrov, V., Strohriegl, P., Huewe, F., Steeger, A., Kostova, K., Burroughs, L., …Pflaum, J. (2017). Low-cost and sustainable organic thermoelectrics based on low-dimensional molecular metals. Advanced Materials, 29(13), 1605682. https://doi.org/10.1002/adma.201605682
DOI https://doi.org/10.1002/adma.201605682
Keywords Organic thermoelectric materials, Molecular metals, Radical ion salts, Thermal conductivity, Seebeck coefficient
Publisher URL http://onlinelibrary.wiley.com/doi/10.1002/adma.201605682/full#publication-history
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingh.../end_user_agreement.pdf
Additional Information This is the peer reviewed version of the following article: F. Huewe, A. Steeger, K. Kostova, L. Burroughs, I. Bauer, P. Strohriegl, V. Dimitrov, S. Woodward, J. Pflaum, Adv. Mater. 2017, 1605682., which has been published in final form at http://onlinelibrary.wi...dma.201605682/abstract. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf





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