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Beyond the Mahan–Sofo best thermoelectric strategy: high thermoelectric performance from directional π-conjugation in two-dimensional poly(tetrathienoanthracene)

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Abstract

Mahan and Sofo proved that the best thermoelectric performance could be found in materials with a sharp peak in the density-of-states (DOS) near the chemical potential, which may come from a localized electronic state. However, such a state usually results in a poor electrical conductivity. Therefore, such an idealized model leads to this question: is there a material which naturally possesses a narrow DOS peak near the band edge without a localized state? The answer is yes. From a number of covalent organic frameworks (COFs), we identified poly(tetrathienoanthracene) (PTTA), a purely organic 2D COF possessing such a DOS and subsequently achieves a significant thermoelectric performance with an enhanced Seebeck coefficient such that the peak n- and p-type power factors can reach up to 14.9 and 21.9 μW cm−1 K−2, respectively. This provided a feasible prototype of the Mahan–Sofo model and demonstrated for the first time that a purely organic 2D COF could exhibit high thermoelectric performance for functional applications.

Graphical abstract: Beyond the Mahan–Sofo best thermoelectric strategy: high thermoelectric performance from directional π-conjugation in two-dimensional poly(tetrathienoanthracene)

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Article information


Submitted
19 Dec 2019
Accepted
11 Feb 2020
First published
11 Feb 2020

J. Mater. Chem. A, 2020, Advance Article
Article type
Communication

Beyond the Mahan–Sofo best thermoelectric strategy: high thermoelectric performance from directional π-conjugation in two-dimensional poly(tetrathienoanthracene)

T. Deng, X. Yong, W. Shi, Z. M. Wong, G. Wu, H. Pan, J. Wang and S. Yang, J. Mater. Chem. A, 2020, Advance Article , DOI: 10.1039/C9TA13886B

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