Google Search

A1: Low temperature materials

Thermoelectric Performances of Donor-Acceptor-Donor Conjugated Polymers Based on Novel [1,2,5]Thiadiazolo[3,4-c]pyridine Unit

Shouli Ming, Shijie Zhen, Kaiwen Lin, Jingkun Xu*, Baoyang Lu*
Jiangxi Key Laboratory of Organic Chemistry, Jiangxi Science and Technology Normal University, Nanchang 330013, PR China

Thermoelectric (TE) materials have attracted significant interest in recent years owing to the world’s demand for energy and the environmental impact of global climate change caused by the combustion of fossil fuels. Inorganic semiconductors are no doubt efficient TE materials, but they are associated with issues like high cost of production, scarcity of materials, and toxicity [1-2]. Due to these problems associated with inorganic semiconductors, conducting polymers have received great attention recently as TE materials due to several advantages over traditional inorganic semiconductors, including low cost, easy processing, and tunable intrinsic properties (electronic, conductivity and stability), which make them good candidates in TE application area. Up to date, a number of such conjugated semiconducting polymers, such as polyacetylene, polypyrroles, polyanilines, polythiophenes, poly(2,7-carbazole)s, and so on, have been studied for their TE applications. However, very little is known about the TE properties of donor-acceptor polymer. Donor–acceptor systems lead to narrower bandgaps because of resonances that enable a stronger double bond character between the donor and acceptor units [3]. The materials with decreased bandgaps always have high electrical conductivities [4]. The bandgaps (Eg) of poly(4,7-bis(2,3-dihydrothieno[3,4-b][1,4]dioxin-5-yl)benzo[c][1,2,5]thiadiazole) (PEBSE) and poly(4,7-bis(2,3-dihydrothieno[3,4-b][1,4]dioxin-5-yl)benzo[c][1,2,5]selenadiazole) (PEBSeE) were found to be 1.19 eV and 1.05 eV, respectively. Their electrical conductivity was determined to be in the range of 10-3~100 S cm-1 by applying a conventional four-probe technique. Most recently, we reported the synthesis of two novel D-A-D polymers, poly(4,7-bis(2,3-dihydrothieno[3,4-b][1,4]dioxin-5-yl)-[1,2,5]thiadiazolo[3,4-c]pyridine) (PEPSE) and poly(4,7-bis(2,3-dihydrothieno[3,4-b][1,4]dioxin-5-yl)-[1,2,5]selenadiazolo[3,4-c]pyridine) (PEPSeE). Compared with PEBSE and PEBSeE, the bandgaps of PEPSE and PEPSeE were found to be narrower. We herein investigated systematically the thermoelectric performances of electrosynthesized PEPSE, PEBSE, PEPSeE and PEBSeP.

References:

[1] N. Dubey, M. Leclerc, J. Polym. Sci. Part B: Polym. Phys. 49 (2011) 467–475.

[2] B.Y. Lu, S. Chen, J.K. Xu, G.Q. Zhao, Synthetic Met. 183 (2013) 8–15.

[3] M. Sendur, A. Balan, D. Baran, B. Karabay, L. Toppare, Org Electron. 11 (2010) 1877–1885.

[4] G. E. Gunbas, A. Durmus, L. Toppare, Adv. Mater. 20 (2008) 691–695.