期刊论文详细信息
Journal of Materiomics
Compensation of Zn substitution and secondary phase controls effective mass and weighted mobility in In and Ga co-doped ZnO material
Hoa Thi Lai1  Dung Van Hoang2  Thang Bach Phan3  Dai Cao Truong3  Ngoc Kim Pham4  Truong Huu Nguyen5  Vinh Cao Tran5  Anh Tuan Thanh Pham5  Thuy Dieu Thi Ung6  Trang Huyen Cao Pham6  Oanh Kieu Truong Le6  Hanh Kieu Thi Ta7 
[1] Center for Innovative Materials and Architectures (INOMAR), HoChiMinh City, Viet Nam;Corresponding author. Laboratory of Advanced Materials, University of Science, HoChiMinh City, 700000, Viet Nam.;Faculty of Materials Science and Technology, University of Science, HoChiMinh City, 700000, Viet Nam;Faculty of Physics and Engineering Physics, University of Science, HoChiMinh City, 700000, Viet Nam;Vietnam National University, HoChiMinh City, 700000, Viet Nam;Laboratory of Advanced Materials, University of Science, HoChiMinh City, 700000, Viet Nam;Vietnam National University, HoChiMinh City, 700000, Viet Nam;
关键词: Thermoelectrics;    In and Ga co-Doped ZnO;    Secondary phase;    Zn substitution;    DOS effective Mass;    Weighted mobility;   
DOI  :  
来源: DOAJ
【 摘 要 】

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.

【 授权许可】

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