Gallium arsenide is the second most used semiconductor material with applications in light-emitting diodes, field-effect transistors, and integrated circuits. Thus, understanding and controlling the thermal conductivity of gallium arsenide is crucial to design devices for such applications. The goal of this study is to predict the thermal conductivity of gallium arsenide as a function of temperature and vacancy concentration. Thermal conductivities are predicted using an equilibrium molecular dynamics method based on the Green-Kubo formalism with temperatures between 300 K and 900 K and vacancy concentrations up to 0.5%. Our results show that the thermal conductivities of the vacancy-free system predicted by our model are in good agreement with experimental values around the Debye temperature. In addition, our model predicts that conductivities significantly decrease with increasing vacancy concentration. At 300 K conductivities drop by 39.5% with a 0.1% defect content and 74.4% with 0.5% respect to that of the pure system. The power spectra of thermal conductivities and heat current autocorrelation functions indicate that phonon scattering produced near the vacancies reduces the contribution of the acoustic frequencies. The density of states quantifies the decrease of acoustic and optic frequencies by increasing the vacancy concentration.
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ASME 2015 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems collocated with the ASME 2015 13th International Conference on Nanochannels, Microchannels, and Minichannels
July 6–9, 2015
San Francisco, California, USA
Conference Sponsors:
- Electronic and Photonic Packaging Division
ISBN:
978-0-7918-5689-5
PROCEEDINGS PAPER
The Prediction of the Thermal Conductivity of Gallium Arsenide: A Molecular Dynamics Study
Fernan Saiz,
Fernan Saiz
University of Toronto, Toronto, ON, Canada
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Cristina H. Amon
Cristina H. Amon
University of Toronto, Toronto, ON, Canada
Search for other works by this author on:
Fernan Saiz
University of Toronto, Toronto, ON, Canada
Cristina H. Amon
University of Toronto, Toronto, ON, Canada
Paper No:
IPACK2015-48114, V002T06A002; 9 pages
Published Online:
November 19, 2015
Citation
Saiz, F, & Amon, CH. "The Prediction of the Thermal Conductivity of Gallium Arsenide: A Molecular Dynamics Study." Proceedings of the ASME 2015 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems collocated with the ASME 2015 13th International Conference on Nanochannels, Microchannels, and Minichannels. Volume 2: Advanced Electronics and Photonics, Packaging Materials and Processing; Advanced Electronics and Photonics: Packaging, Interconnect and Reliability; Fundamentals of Thermal and Fluid Transport in Nano, Micro, and Mini Scales. San Francisco, California, USA. July 6–9, 2015. V002T06A002. ASME. https://doi.org/10.1115/IPACK2015-48114
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