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We have shown that mainly due to the differences in microstructure and possibly the varying amount of crystalline defects in the samples, the thermoelectric performance of bulk ZnO samples obtained through wet chemistry methods is 4 times higher compared to the sample obtained from commercially available ZnO powder. By utilizing the developed chemical precipitation technique, we successfully synthesized a series of Al-doped samples with a nominal composition of Zn1–xAlxO (x = 0.02, 0.04, 0.06). The incorporation of Al into ZnO results in two significant effects: (1) partial substitution of Zn by Al, leading to an increase in the power factor, and (2) the formation of ZnAl2O4 spinel phase, which has negligible influence on electronic transport but acts as a scattering center for phonons in addition to the mass and strain fluctuations induced by the partial substitution of Zn with Al. Consequently, the thermoelectric performance was further improved by a factor of 3 through Al doping, achieving a zT value of approximately 0.12 at 1100 K for the sample with a nominal composition of Zn0.94Al0.06O.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: thermoelectric

刊行年月日: 2023-12-09

出版者: Elsevier BV

掲載誌:

• Journal of Alloys and Compounds (ISSN: 09258388) p. 173106- 173106

研究助成金:

• JST Mirai JPMJMI19A1
• Japan Science and Technology Agency JPMJSP2124
• Russian Science Foundation 19-79-10282

原稿種別: 査読前原稿 (Author's original)

MDR DOI: https://doi.org/10.48505/nims.4456

公開URL: https://doi.org/10.1016/j.jallcom.2023.173106

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更新時刻: 2024-04-01 12:30:36 +0900

MDRでの公開時刻: 2024-04-01 12:30:36 +0900