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Your search keyword '"Oanh Kieu Truong Le"' showing total 2 results
Start Over Author "Oanh Kieu Truong Le" Journal journal of materiomics
2 results on '"Oanh Kieu Truong Le"'

1. Compensation of Zn substitution and secondary phase controls effective mass and weighted mobility in In and Ga co-doped ZnO material

Author

Oanh Kieu Truong Le, Anh Tuan Thanh Pham, Ngoc Kim Pham, Trang Huyen Cao Pham, Truong Huu Nguyen, Dung Van Hoang, Hanh Kieu Thi Ta, Dai Cao Truong, Hoa Thi Lai, Thuy Dieu Thi Ung, Vinh Cao Tran, and Thang Bach Phan

Subjects
Thermoelectrics, In and Ga co-Doped ZnO, Secondary phase, Zn substitution, DOS effective Mass, Weighted mobility, Materials of engineering and construction. Mechanics of materials, TA401-492
Abstract

Conductivity σ and thermal conductivity κ are directly related to carrier concentration while Seebeck coefficient S is inversely proportional to carrier concentration. Therefore, improving thermoelectric (TE) performance is challenging. Here, the first-time analysis of secondary phase-controlled TE performance in terms of density-of-state effective mass md∗, weighted mobility μw and quality factor B is discussed in ZnO system. The results show that the secondary spinel phase Ga2O3(ZnO)9 not only impacts on κ but also on σ and S at high temperature, while the effect of carrier concentration seem to be dominant at low temperature. For the high-spinel-segregation sample, a compensation of dopant atoms from the spinel to substitutional sites in the ZnO matrix at high temperature leads to a low decreased rate of temperature-dependent md∗. The compensation process also induces a band sharpening, a small μw reduction, and a large B enhancement. As a result, In and Ga co-doped ZnO bulk with the highest spinel segregation achieves the greatest PF improvement by 112.8%, owing to enhanced Seebeck coefficient by 110% as compared to the good Zn-substitution sample.

Published
2021
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2. Compensation of Zn substitution and secondary phase controls effective mass and weighted mobility in In and Ga co-doped ZnO material

Author

Hoa Thi Lai, Oanh Kieu Truong Le, Vinh Cao Tran, Dung Van Hoang, Hanh Kieu Thi Ta, Dai Cao Truong, Truong Huu Nguyen, Thuy Dieu Thi Ung, Anh Tuan Thanh Pham, Thang Bach Phan, Trang Huyen Cao Pham, and Ngoc Kim Pham

Subjects
Materials science, Weighted mobility, Analytical chemistry, 02 engineering and technology, Conductivity, engineering.material, 010402 general chemistry, 01 natural sciences, Thermal conductivity, Effective mass (solid-state physics), DOS effective Mass, Phase (matter), Seebeck coefficient, Thermoelectric effect, Materials of engineering and construction. Mechanics of materials, Zn substitution, Thermoelectrics, Dopant, Spinel, Metals and Alloys, 021001 nanoscience & nanotechnology, 0104 chemical sciences, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Secondary phase, In and Ga co-Doped ZnO, TA401-492, engineering, 0210 nano-technology
Abstract

Conductivity σ and thermal conductivity κ are directly related to carrier concentration while Seebeck coefficient S is inversely proportional to carrier concentration. Therefore, improving thermoelectric (TE) performance is challenging. Here, the first-time analysis of secondary phase-controlled TE performance in terms of density-of-state effective mass m d ∗ , weighted mobility μw and quality factor B is discussed in ZnO system. The results show that the secondary spinel phase Ga2O3(ZnO)9 not only impacts on κ but also on σ and S at high temperature, while the effect of carrier concentration seem to be dominant at low temperature. For the high-spinel-segregation sample, a compensation of dopant atoms from the spinel to substitutional sites in the ZnO matrix at high temperature leads to a low decreased rate of temperature-dependent m d ∗ . The compensation process also induces a band sharpening, a small μw reduction, and a large B enhancement. As a result, In and Ga co-doped ZnO bulk with the highest spinel segregation achieves the greatest PF improvement by 112.8%, owing to enhanced Seebeck coefficient by 110% as compared to the good Zn-substitution sample.

Published
2021

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