Interplay between mass-impurity and vacancy phonon scattering effects on the thermal conductivity of doped cadmium oxide
Abstract
Understanding the impact and complex interaction of thermal carrier scattering centers in functional oxide systems is critical to their progress and application. In this work, we study the interplay among electron and phonon thermal transport, mass-impurity scattering, and phonon-vacancy interactions on the thermal conductivity of cadmium oxide. We use time domain thermoreflectance to measure the thermal conductivity of a set of CdO thin films doped with Dy up to the saturation limit. Using measurements at room temperature and 80 K, our results suggest that the enhancement in thermal conductivity at low Dy concentrations is dominated by an increase in the electron mobility due to a decrease in oxygen vacancy concentration. Furthermore, we find that at intermediate doping concentrations, the subsequent decrease in thermal conductivity can be ascribed to a large reduction in phononic thermal transport due to both point defect and cation-vacancy scattering. With these results, we gain insight into the complex dynamics driving phonon scattering and resulting thermal transport in functional oxides.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jan 11, 2016
- Source ID
- 10.1063/1.4939652
Entities
People
- Brian F. Donovan
- Edward Sachet
- Jon-Paul Maria
- Patrick E Hopkins
Organizations
- North Carolina State University
- Office of Naval Research
- University of Virginia