Reducing lattice thermal conductivity (κl) of a thermoelectric material is one of the most popular strategies to improve its thermoelectric performance. Particularly, many efforts have been focused on decreasing grain size to effectively scatter low-frequency phonons by boundary scattering. In addition to the boundary scattering, we have recently demonstrated that dense arrays of dislocations formed in grain boundaries can further reduce the κl by dislocation scattering at room temperature and above. In order to closely examine the effect of the dislocation scattering, the κl of polycrystalline Bi0.5Sb1.5Te3 samples with and without dislocations were measured at low temperature (T < 200 K). Because other phonon scattering mechanisms like Umklapp and point-defect scatterings are not dominant at low temperature, we clearly show the presence of the dislocation scattering in the sample with the dislocations by successfully describing its low temperature experimental κl with a theoretical model.
Bibliographical noteFunding Information:
The authors would like to acknowledge funding from the Solid-State Solar-Thermal Energy Conversion Center (S3TEC), an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Basic Energy Sciences under Award # DE-SC0001299. H.-S. Kim gratefully acknowledge financial support from Samsung Advanced Institute of Technology (SAIT). We also like to thank Dr. Thomas Chasapis and Riley Hanus (Northwestern University) for important discussions.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics