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Modeling of interface roughness in thermoelectric composite materials
F Gather1, C Heiliger, P J Klar
1I. Physikalisches Institut, Justus-Liebig-University of Giessen, Germany. florian.gather@physik.uni-giessen.de
Summary
Designing interfaces in superlattice thermoelectric materials is key. Controlling interface roughness type, not just minimizing it, significantly impacts thermoelectric performance and figure of merit.
Area of Science:
- Condensed matter physics
- Materials science
- Nanotechnology
Background:
- Thermoelectric materials convert heat to electricity.
- Superlattices with alternating material layers offer tunable properties.
- Interface structure critically influences material performance.
Purpose of the Study:
- To investigate how mesoscopic interface structure affects thermoelectric properties in superlattices.
- To determine the impact of interface roughness on the thermoelectric figure of merit.
- To provide insights for optimizing superlattice design for enhanced thermoelectric applications.
Main Methods:
- Utilized a network model to simulate thermoelectric properties.
- Analyzed the influence of layer thickness and interface resistances.
- Investigated different types of interface roughness, including atomic diffusion and alloying.
Main Results:
- Thermoelectric figure of merit is dependent on layer thickness and interface design.
- Interface roughness generally reduces the figure of merit compared to ideal interfaces.
- Alloying due to smooth interface roughness causes the most significant reduction in performance.
Conclusions:
- Optimizing interface design is crucial for enhancing thermoelectric materials.
- Minimizing and controlling the type of interface roughness are essential for real-world applications.
- Network models effectively link mesoscopic disorder to macroscopic transport properties.
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