Electron conducting Ag2Te nanowire/polymer thermoelectric thin films

Herein, we report the electrical conductivity and Seebeck coefficients of air-stable, thin films of poly([N,N′-bis(2-octyldodecyl)-naphthalene-1,4,5,8-bis(dicarboximide)-2,6-diyl]-alt-5,5′-(2,2′-bithiophene)) embedded with β-Ag2Te nanowires. Three different length nanowires (∼2600, ∼800, and ∼300 nm...

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Veröffentlicht in:Journal of vacuum science & technology. A, Vacuum, surfaces, and films Vacuum, surfaces, and films, 2021-03, Vol.39 (2)
Hauptverfasser: Sutch, Tabitha, Allred, Jared M., Szulczewski, Greg
Format: Artikel
Sprache:eng
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Zusammenfassung:Herein, we report the electrical conductivity and Seebeck coefficients of air-stable, thin films of poly([N,N′-bis(2-octyldodecyl)-naphthalene-1,4,5,8-bis(dicarboximide)-2,6-diyl]-alt-5,5′-(2,2′-bithiophene)) embedded with β-Ag2Te nanowires. Three different length nanowires (∼2600, ∼800, and ∼300 nm) were synthesized and combined with the polymer to yield composite thin films. The room temperature electrical conductivity values of thin films made from the longest nanowires were 5 orders of magnitude larger than the shorter nanowires. The electrical conductivity data were modeled to a series and parallel-connected composite network. The films with the longest nanowires best fit a series-connected model, while the shorted nanowires best fit a parallel connected model. Specifically, the electrical conductivity of the thin films containing the longest Ag2Te nanowires increased from 0.16 to 0.61 S/cm when the weight percent Ag2Te increased from 45 to 85%. The magnitude of the Seebeck coefficient remained relatively unchanged (about −130 μV/K) as the amount of Ag2Te in the films increased. A power factor of ∼1 μW/mK2 was determined for the 85 wt. % Ag2Te films at room temperature. These results reveal the important role of the nanowire length in the thermoelectric performance of composite thin films.
ISSN:0734-2101
1520-8559
DOI:10.1116/6.0000690