Optimized weighted mobility induced high thermoelectric performance of ZnO‐based multilayered thin films

As a transparent thermoelectric oxide, gallium‐doped zinc oxide (GZO) has the potential to power wearable or portable electronics and may be used in the integrated circuits industry for chip cooling. Constructing ZnO–GZO interfaces has been proposed as an effective strategy for improving thermoelect...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 2023-05, Vol.106 (5), p.2911-2917
Main Authors: Zhou, Zhifang, Zheng, Yunpeng, Yang, Yueyang, Zhang, Wenyu, Wei, Bin, Zou, Mingchu, Lan, Jinle, Nan, Ce‐Wen, Lin, Yuan‐Hua
Format: Article
Language:English
Subjects:
Band structure of solids
Carrier transport
Electrical properties
electrical transport property
Electron transport
Gallium
Integrated circuits
multilayer interface
Multilayered thin films
Optimization
Power factor
thermoelectric
Thermoelectricity
Thin films
Transport properties
weighted mobility
Zinc oxide
Zinc oxides
ZnO thin films
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Summary:As a transparent thermoelectric oxide, gallium‐doped zinc oxide (GZO) has the potential to power wearable or portable electronics and may be used in the integrated circuits industry for chip cooling. Constructing ZnO–GZO interfaces has been proposed as an effective strategy for improving thermoelectric performance of GZO thin films. However, without the aid of band structure calculation for multilayered films, it is hard to directly elucidate the underlying mechanisms of carrier transport. Weighted mobility is an indicator that reveals the inherent electronic transport properties like carrier scattering, electronic band structure, and so on. Thus, to further investigate the effects of ZnO–GZO interfaces on electrical properties of GZO thin films, the structures containing different numbers of ZnO–GZO interfaces were designed and the correlations among numbers of ZnO–GZO interfaces, weighted mobility, and electrical properties were explored. It was found that with more ZnO–GZO interfaces, the weighted mobility increased, and the power factor values also improved as well. Consequently, an enhanced power factor value reached 439 μW m−1 K−2 at 623 K. This work demonstrated the beneficial effects of multiple interfaces on the improvements of electrical transport performance through analyzing weighted mobility, which laid a foundation for further optimization of thermoelectric performance.
ISSN:0002-7820
1551-2916
DOI:10.1111/jace.18950