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Meeting 2021 TMS Annual Meeting & Exhibition
Symposium Phonons, Electrons and Dislons: Exploring the Relationships Between Plastic Deformation and Heat
Presentation Title Dislocation-limited Thermal Transport in III-Nitride Materials
Author(s) Lucas Lindsay, Hongkun Li, Riley Hanus, Carlos Polanco, Andreas Zeidler, Gregor Koblmuller, Yee Kan Koh
On-Site Speaker (Planned) Lucas Lindsay
Abstract Scope Wide bandgap semiconductors (e.g. III-Nitrides) are of extensive technological importance, especially for high power electronics and light emitting diodes. For such applications, thermal management is a critical challenge as manipulating the electrons inevitably generates Joule’s heating of active regions in device architectures. Here I discuss recent pump-probe transport measurements and first principles calculations providing insights into the interplay of thermal resistance mechanisms limiting III-Nitride functionalities, particularly regarding the role of dislocations. We have demonstrated that phonon-dislocation scattering in GaN is weaker than suggested by previous measurements, likely due to sample and experiment size effects. Nonetheless, dislocation-limited k and k anisotropy are observed in InN and GaN films with highly oriented dislocations at high densities. These efforts suggest novel pathways for tuning k via defect engineering. L.L. acknowledges support from the U. S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division.
Proceedings Inclusion? Planned:
Keywords Computational Materials Science & Engineering, Other, Characterization

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

Dislocation-limited Thermal Transport in III-Nitride Materials
Dislocation Drag in Metals: Dependence on Velocity, Temperature, Density, and Crystal Geometry, and Its Effect on Material Response
Do Moving Dislocations Induce Lattice Instabilities?
Inelastic Neutron Scattering Investigation of the Phonon Spectra of Dislocated Nb Crystals
Introduction to Dislons: A Quantized Description of Dislocations with Implications for Thermal and Electrical Transport
Introductory Comments: Phonons, Electrons and Dislons: Exploring the Relationships between Plastic Deformation and Heat
Role of Tantalum Concentration and Processing Temperature on High Strain Rate Phonon Behavior in Copper-tantalum Alloys
Shear Bands, Thermal Profiles and Microstructure Stability in Large-strain Deformation of High Entropy Alloys
The Effects of Heating Rate on Defect Reduction by Recrystallization in Deformed Polycrystal Niobium
Thermal and Strain Rate Effects on Plasticity and Fracture of Gen 3 Steels
Thermo-mechanics of Large Deformation Shear Banding
Thermomechanical Conversion in Metals: Dislocation Plasticity Model Evaluation of the Taylor-quinney Coefficient
Unified Analysis of Temperature Fields Arising from Large Strain Deformation and Friction in Manufacturing Processes

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