Suppression of lattice thermal conductivity by mass-conserving cation mutation in multi-component semiconductors
Source abstract
Abstract
In semiconductors almost all heat is conducted by phonons (lattice vibrations), which is limited by their quasi-particle lifetimes. Phonon-phonon interactions represent scattering mechanisms that produce thermal resistance. In thermoelectric materials, this resistance due to anharmonicity should be maximised for optimal performance. We use a first-principles lattice-dynamics approach to explore the changes in lattice dynamics across an isostructural series where the average atomic mass is conserved: ZnS to CuGaS2 to Cu2ZnGeS4. Our results demonstrate an enhancement of phonon interactions in the multernary materials and confirm that lattice thermal conductivity can be controlled independently of the average mass and local coordination environments.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Advanced Thermoelectric Materials and Devices · Thermal properties of materials · Thermography and Photoacoustic Techniques
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Department of Mechanical Engineering, Keio University, Yokohama 223-8522, Japan
Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, United Kingdom
Elements Strategy Initiative for Structural Materials, Kyoto University, Kyoto 606-8501, Japan
Department of Materials Science and Engineering, Kyoto University, Kyoto 606-8501, Japan
Global E3 Institute and Department of Materials Science and Engineering, Yonsei University, Seoul 120-749, South Korea
Funding
Engineering and Physical Sciences Research Council (EPSRC)
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