Structural modulation induced by cobalt‐based ionic liquids for enhanced thermoelectric transport in PEDOT:PSS

Chemistry - An Asian Journal - Tập 16 Số 18 - Trang 2740-2744 - 2021
Yannan Lu1, Aoyun Wu2, Chenwei Sha2, Xiao‐Chun Hang2, David James Young1
1College of Engineering, Information Technology and Environment Charles Darwin University Darwin, Northern Territory 0909 Australia
2Key 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

Tóm tắt

AbstractPoly(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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Thông tin xuất bản

Chemistry - An Asian Journal

Tập 16 Số 18

2740-2744

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