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One Stone, Three Birds: Feasible Tuning of Barrier Heights Induced by Hybridized Interface in Free-Standing PEDOT@Bi 2 Te 3 Thermoelectric Films.

One Stone, Three Birds: Feasible Tuning of Barrier Heights Induced by Hybridized Interface in Free-Standing PEDOT@Bi 2 Te 3 Thermoelectric Films.

Authors :
Feng, Li
Wang, Fen
Luo, Hongjie
Zhang, Yajuan
Zhu, Jianfeng
Qin, Yi
Source :
Polymers (20734360); Jul2024, Vol. 16 Issue 14, p1979, 17p
Publication Year :
2024

Abstract

Converting low-grade thermal energy into electrical energy is crucial for the development of modern smart wearable energy technologies. The free-standing films of PEDOT@Bi<subscript>2</subscript>Te<subscript>3</subscript> prepared by tape-casting hold promise for flexible thermoelectric technology in self-powered sensing applications. Bi<subscript>2</subscript>Te<subscript>3</subscript> nanosheets fabricated by the solvothermal method are tightly connected with flat-arranged PEODT molecules, forming an S-Bi bonded interface in the composite materials, and the bandgap is reduced to 1.63 eV. Compared with the PEDOT film, the mobility and carrier concentration of the composite are significantly increased at room temperature, and the conductivity reaches 684 S/cm. Meanwhile, the carrier concentration decreased sharply at 360 K indicating the creation of defect energy levels during the interfacial reaction of the composites, which increased the Seebeck coefficient. The power factor was improved by 68.9% compared to PEDOT. In addition, the introduction of Bi<subscript>2</subscript>Te<subscript>3</subscript> nanosheets generated defects and multidimensional interfaces in the composite film, which resulted in weak phonon scattering in the conducting polymer with interfacial scattering. The thermal conductivity of the film is decreased and the ZT value reaches 0.1. The composite film undergoes 1500 bending cycles with a 14% decrease in conductivity and has good flexibility. This self-supporting flexible thermoelectric composite film has provided a research basis for low-grade thermal energy applications. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
20734360
Volume :
16
Issue :
14
Database :
Complementary Index
Journal :
Polymers (20734360)
Publication Type :
Academic Journal
Accession number :
178694228
Full Text :
https://doi.org/10.3390/polym16141979