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Article

The Molecular Weight Dependence of Thermoelectric Properties of Poly (3-Hexylthiophene)

1
Department of Electronic Engineering, CHOSE—Centre for Hybrid and Organic Solar Energy, University of Rome Tor Vergata, via del Politecnico 1, 00133 Rome, Italy
2
Institute for Photonics and Nanotechnologies, CNR, 00156 Rome, Italy
*
Author to whom correspondence should be addressed.
Materials 2020, 13(6), 1404; https://doi.org/10.3390/ma13061404
Received: 16 February 2020 / Revised: 12 March 2020 / Accepted: 16 March 2020 / Published: 19 March 2020
(This article belongs to the Special Issue Novel Thermoelectric Materials and Their Applications)
Organic materials have been found to be promising candidates for low-temperature thermoelectric applications. In particular, poly (3-hexylthiophene) (P3HT) has been attracting great interest due to its desirable intrinsic properties, such as excellent solution processability, chemical and thermal stability, and high field-effect mobility. However, its poor electrical conductivity has limited its application as a thermoelectric material. It is therefore important to improve the electrical conductivity of P3HT layers. In this work, we studied how molecular weight (MW) influences the thermoelectric properties of P3HT films. The films were doped with lithium bis(trifluoromethane sulfonyl) imide salt (LiTFSI) and 4-tert butylpyridine (TBP). Various P3HT layers with different MWs ranging from 21 to 94 kDa were investigated. UV–Vis spectroscopy and atomic force microscopy (AFM) analysis were performed to investigate the morphology and structure features of thin films with different MWs. The electrical conductivity initially increased when the MW increased and then decreased at the highest MW, whereas the Seebeck coefficient had a trend of reducing as the MW grew. The maximum thermoelectric power factor (1.87 μW/mK2) was obtained for MW of 77 kDa at 333 K. At this temperature, the electrical conductivity and Seebeck coefficient of this MW were 65.5 S/m and 169 μV/K, respectively. View Full-Text
Keywords: thermoelectrics; organic materials; poly (3-hexylthiophene) (P3HT); polymer chain; molecular weight thermoelectrics; organic materials; poly (3-hexylthiophene) (P3HT); polymer chain; molecular weight
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MDPI and ACS Style

Mardi, S.; Pea, M.; Notargiacomo, A.; Yaghoobi Nia, N.; Carlo, A.D.; Reale, A. The Molecular Weight Dependence of Thermoelectric Properties of Poly (3-Hexylthiophene). Materials 2020, 13, 1404. https://doi.org/10.3390/ma13061404

AMA Style

Mardi S, Pea M, Notargiacomo A, Yaghoobi Nia N, Carlo AD, Reale A. The Molecular Weight Dependence of Thermoelectric Properties of Poly (3-Hexylthiophene). Materials. 2020; 13(6):1404. https://doi.org/10.3390/ma13061404

Chicago/Turabian Style

Mardi, Saeed, Marialilia Pea, Andrea Notargiacomo, Narges Yaghoobi Nia, Aldo D. Carlo, and Andrea Reale. 2020. "The Molecular Weight Dependence of Thermoelectric Properties of Poly (3-Hexylthiophene)" Materials 13, no. 6: 1404. https://doi.org/10.3390/ma13061404

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