Enhanced high-temperature thermoelectric properties of Ce- and Dy-doped ZnO for power generation

Metal oxides are widely used in many applications such as thermoelectric, solar cells, sensors, transistors, and optoelectronic devices due to their outstanding mechanical, chemical, electrical, and optical properties. For instance, their high Seebeck coefficient, high thermal stability, and earth abundancy make them suitable for thermoelectric power generation, particularly at a high-temperature regime. In this article, we review the recent advances of developing high electrical properties of metal oxides and their applications in thermoelectric, solar cells, sensors, and other optoelectronic devices. The materials examined include both narrow-band-gap (e.g., Na x CoO 2 , Ca 3 Co 4 O 9 , BiCuSeO, CaMnO 3 , SrTiO 3 ) and wide-band-gap materials (e.g., ZnO-based, SnO 2 -based, In 2 O 3 -based). Unlike previous review articles, the focus of this study is on identifying an effective doping mechanism of different metal oxides to reach a high power factor. Effective dopants and doping strategies to achieve high carrier concentration and high electrical conductivities are highlighted in this review to enable the advanced applications of metal oxides in thermoelectric power generation and beyond.

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“…. As a result, this increased carrier concentration of the system can compensate for the electrical charge balance [94].…”

Section: Zno-basedmentioning

confidence: 99%

“…The addition of a small amount of Dy 2 O 3 has been also found to be effective for improving the thermoelectric properties of ZnO [94]. .…”

Section: Zno-basedmentioning

confidence: 99%

Metal oxides for thermoelectric power generation and beyond

Feng

Jiang

Ghafari

et al. 2017

Adv Compos Hybrid Mater

119

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“…The porosity of the ceramics is of the same trend as the grain size. Most pores exist at the grain boundaries, and some remain within individual grain [29]. Therefore, the proper addition of CuO can promote the grain growth and the densification of the Tb 4 O 7 -based ceramics such as 5.0 wt% doped sample.…”

Section: Structural Characterizationmentioning

confidence: 99%

Microstructures and electrical properties of copper oxide doped terbium oxide ceramics

Gan

Wang

Dong

et al. 2014

J Mater Sci: Mater Electron

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The effects of copper oxide (CuO) on the microstructure and electric properties of nonstoichiometric compound terbium dioxide (Tb 4 O 7 ) ceramics were investigated. Results included a reduction in the sintering temperature to 1,100°C, a grain size of 4.2 lm, and a density of 96.2 %, which are larger than the values in previous investigation for Tb 4 O 7 ceramics (grain sizes between 0.4 and 1.0 lm). Among the sintered ceramics, the sample doped with 10.0 wt% CuO showed the maximum nonlinear coefficient a = 43.5, which is obviously greater than a = 3.03 of the pure sample. Doping with 10.0 wt% CuO also exhibited nonlinearity a = 2.14 even at 1,123 K. In addition, the impedance spectra of the sample doped with 5.0 mol% CuO showed the largest grain boundary semicircle; 0 and 20 % samples showed both inductive and capacitive reactance.

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“…The electrical transport can be described mainly by power factor P = 2 ∕ . It is necessary for a TE material to have high power factor and low thermal conductivity to achieve zT for TEG applications, which is hard to achieve due to conflicting transport behaviors [4][5][6].…”

Section: Introductionmentioning

confidence: 99%