journal article·2019-07-03

Achieving a High Thermoelectric Performance of Tetrahedrites by Adjusting the Electronic Density of States and Enhancing Phonon Scattering

Lulu Huang, Yuan Kong, Jian Zhang, Rui Xu, Chen Zhu, Jie Wu, Bushra Jabbar, Di Li, Zhaoming Wang, Xiaoying Qin

ACS Applied Materials & Interfaces· Volume 11· Issue 26
Publisher page

Abstract

Recently, many researchers have focused on tetrahedrite-based compounds due to their intrinsic low thermal conductivity; however, their thermoelectric performance is limited by the lower power factor. In this case, using Ge doping on Sb sites, the power factor is obviously enhanced due to an increment in carrier concentration and density of states; simultaneously, the thermal conductivity is substantially suppressed by atomic defects. Also, ZnO nanoparticles are introduced in the Ge-doped compounds to further weaken the thermal conductivity. As a result, the maximum dimensionless figure of merit (ZT) of ∼1.0 is obtained for the Cu12Sb3.96Ge0.04S13-0.5 wt % ZnO sample at 750 K, which is ∼72% larger than that of Cu12Sb4S13. All results indicate that suitable elemental doping combined with the incorporation of the nanophase is a very promising approach for Cu12Sb4S13 tetrahedrites to improve the thermoelectric performance.
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Research context

OpenAlex topics: Advanced Thermoelectric Materials and Devices · Chalcogenide Semiconductor Thin Films · Quantum Dots Synthesis And Properties

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, P. R. China

University of Science and Technology of China, Hefei 230026, P. R. China

Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemical Physics and Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China

MIIT Key Laboratory of Advanced Metallic and Intermetallic Materials Technology, School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, P. R. China

Funding

Ministry of Science and Technology of the People's Republic of China · National Natural Science Foundation of China

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