TY - JOUR
T1 - Enhanced thermoelectric properties in p-type Bi0.4Sb1.6Te3 alloy by combining incorporation and doping using multi-scale CuAlO2 particles
AU - Song, Zijun
AU - Zhang, Qihao
AU - Liu, Yuan
AU - Zhou, Zhenxing
AU - Lu, Xiaofang
AU - Wang, Lianjun
AU - Jiang, Wan
AU - Chen, Lidong
N1 - Funding Information:
This work was funded by Natural Science Foundation of China (No. 51374078 and 51403037), Shanghai Committee of Science and Technology (No. 13JC1400100), and the Opening Project of State Key Laboratory of High Performance Ceramics and Superfine Microstructure (SKL201007SIC), the Fundamental Research Funds for the Central Universities, DHU Distinguished Young Professor Program and DHU post-graduate innovation program.
Publisher Copyright:
© 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
PY - 2017/1/1
Y1 - 2017/1/1
N2 - Multi-scale CuAlO2 particles are introduced into the Bi0.4Sb1.6Te3 matrix to synergistically optimize the electrical conductivity, Seebeck coefficient, and the lattice thermal conductivity. Cu element originating from fine CuAlO2 grains diffuses into the Bi0.4Sb1.6Te3 matrix and tunes the carrier concentration while the coarse CuAlO2 particles survive as the second phase within the matrix. The power factor is improved at the whole temperatures range due to the low-energy electron filtering effect on Seebeck coefficient and enhanced electrical transport property by mild Cu doping. Meanwhile, the remaining CuAlO2 inclusions give rise to more boundaries and newly built interfaces scattering of heat-carrying phonons, resulting in the reduced lattice thermal conductivity. Consequently, the maximum ZT is found to be enhanced by 150% arising from the multi-scale microstructure regulation when the CuAlO2 content reaches 0.6 vol.%. Not only that, but the ZT curves get flat in the whole temperature range after introducing the multi-scale CuAlO2 particles, which leads to a remarkable increase in the average ZT.
AB - Multi-scale CuAlO2 particles are introduced into the Bi0.4Sb1.6Te3 matrix to synergistically optimize the electrical conductivity, Seebeck coefficient, and the lattice thermal conductivity. Cu element originating from fine CuAlO2 grains diffuses into the Bi0.4Sb1.6Te3 matrix and tunes the carrier concentration while the coarse CuAlO2 particles survive as the second phase within the matrix. The power factor is improved at the whole temperatures range due to the low-energy electron filtering effect on Seebeck coefficient and enhanced electrical transport property by mild Cu doping. Meanwhile, the remaining CuAlO2 inclusions give rise to more boundaries and newly built interfaces scattering of heat-carrying phonons, resulting in the reduced lattice thermal conductivity. Consequently, the maximum ZT is found to be enhanced by 150% arising from the multi-scale microstructure regulation when the CuAlO2 content reaches 0.6 vol.%. Not only that, but the ZT curves get flat in the whole temperature range after introducing the multi-scale CuAlO2 particles, which leads to a remarkable increase in the average ZT.
KW - BiSbTe alloy
KW - multi-scale CuAlO particles
KW - thermoelectric properties
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U2 - 10.1002/pssa.201600451
DO - 10.1002/pssa.201600451
M3 - Article
AN - SCOPUS:84987680732
VL - 214
JO - Physica Status Solidi (A) Applications and Materials Science
JF - Physica Status Solidi (A) Applications and Materials Science
SN - 1862-6300
IS - 1
M1 - 1600451
ER -