Structural modulation induced by cobalt-based ionic liquids for enhanced thermoelectric transport in PEDOT:PSS |
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| Authors: | Yannan Lu Aoyun Wu Chenwei Sha Dr. Xiao-chun Hang Prof. David James Young |
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| Affiliation: | 1. College of Engineering, Information Technology and Environment, Charles Darwin University, Darwin, Northern Territory, 0909 Australia;2. Key Laboratory of Flexible Electronics (KLOFE) and Institute of Advanced Materials (IAM), National Jiangsu Synergetic Innovation Center for Advanced Materials, Nanjing Tech University, Nanjing, 211816 P. R. China |
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| Abstract: | Poly(3,4ethylenedioxythiophene):poly(4-styrenesulfonate) (PEDOT:PSS) has been intensively studied for its thermoelectric applications. Structural modulation to improve crystalline ordering, chain conformation and film morphology is a promising way to decouple the trade-off between conductivity and Seebeck coefficient and thus improve the thermoelectric power factor. Post treatment with ionic liquid ([CoCl2 ⋅ 6H2O]:[ChCl]) bearing cobalt-containing anions resulted in a remarkable enhancement of the power factor to 76.8 μW m−1 K−2. This IL combines the influence of a high-boiling polar organic solvent and diffusing ions. A high σ mainly resulted from the efficient removal of PSS chains, ordering of the structure and delocalization of bipoloran-dominant transport after conformational change. The increase in S was not due to dedoping of PEDOT chains, but rather the sharp feature of the density of states at the Fermi level induced by ion-exchange with unconventional anions. |
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| Keywords: | PEDOT:PSS thermoelectric conductive polymer ionic liquids structural modulation |
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