Breaking the tradeoff among thermoelectric parameters by multi composite of porosity and CNT in AZO films

Shiying Liu, Mingdi Lan, Guojian Li, Yongjun Piao, Hassan Ahmoum and Qiang Wang

Energy, 2021, vol. 225, issue C

Abstract: Multi-nanocomposite is an effective method to achieve high thermoelectric (TE) performance by breaking the tradeoff among three TE parameters. This paper presents a comparative study of incorporated carbon nanotube (CNT)/Au in evaporated porous Al-doped ZnO (AZO) films. The effect of the nanocomposite interface on scattering of carriers and phonons is used to independently tune thermal conductivity and power factor in the multi-nanocomposite AZO films. This breaks the tradeoff and improves the figure of merit (ZT) of the film. Moreover, the temperature gradient retains in the out-of-plane of the films. These make the AZO film composited CNT and porosity have higher output power than that of the non-porous films. This provides a simple method for the low-dimension film to increase the TE properties through breaking the tradeoff and makes the TE materials suitable for efficient harvesting in low-grade waste heat.

Keywords: Thermoelectric film; Nanocomposite; Porosity; CNT; ZnO (search for similar items in EconPapers)
Date: 2021
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:225:y:2021:i:c:s0360544221005697

DOI: 10.1016/j.energy.2021.120320

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