Achieving High Thermoelectric Properties of Cu2Se via Lattice Softening and Phonon Scattering Mechanism
Source abstract
Abstract
Co-alloying solid solution was regarded as a convenient approach to optimize the thermoelectric properties. In this study, the densified Cu2–x(MnFeNi)xSe1–yTey (x = 0–0.09; y = 0–0.03) designed by entropy engineering was prepared via microwave melting and hot-pressing sintering. The scattering mechanism and thermoelectric performance of Cu2Se were evaluated. Due to the regulation of the carrier concentration and structural stabilization of the β-phase, the electrical performance was significantly enhanced. Moreover, the infrared spectroscopy analysis and the decrease in sound velocity unambiguously demonstrated the existence of a lattice softening effect of bulk Cu2Se. By manipulating the lattice conductivity using entropy engineering, the thermal transport property gradually decreased (∼0.4 W m–1 K–1 at 300 K) due to the lattice softening effect and phonon scattering mechanism. The obtained zTmax was 1.37 at 750 K in the Cu2.91(MnFeNi)0.09Se0.99Te0.01 sample.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Advanced Thermoelectric Materials and Devices · Thermal properties of materials · Chalcogenide Semiconductor Thin Films
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
School of Materials Science and Engineering, University of Jinan, Jinan 250022, China
Heze Institute of Product Inspection and Testing, Heze 274000, China
Funding
National Natural Science Foundation of China · Natural Science Foundation of Shandong Province · Project of Shandong Province Higher Educational Science and Technology Program · Leader of scientific research studio program of Jinan
References (57)
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