In compact transistors, large electric fields near the drain side create hot spots whose dimensions are smaller than the phonon mean free path in the medium. In this paper, we present a study of unsteady hot spot behavior. The unsteady gray phonon Boltzmann transport equation (BTE) is solved in the relaxation time approximation using a finite volume method. Electron-phonon interaction is represented as a heat source term in the phonon BTE. The evolution of the temperature profile is governed by the interaction of four competing time scales: the phonon residence time in the hot spot and in the domain, the duration of the energy source, and the phonon relaxation time. The influence of these time scales on the temperature is investigated. Both boundary scattering and heat source localization effects are observed to have considerable impact on the thermal predictions. Comparison of BTE solutions with conventional Fourier diffusion analysis reveals significant discrepancies.
Simulation of Unsteady Small Heat Source Effects in Sub-Micron Heat Conduction
Contributed by the Heat Transfer Division for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received by the Heat Transfer Division July 17, 2002; revision received June 3, 2003. Associate Editor: G. Chen.
- Views Icon Views
- Share Icon Share
- Search Site
Narumanchi , S. V. J., Murthy, J. Y., and Amon, C. H. (September 23, 2003). "Simulation of Unsteady Small Heat Source Effects in Sub-Micron Heat Conduction ." ASME. J. Heat Transfer. October 2003; 125(5): 896–903. https://doi.org/10.1115/1.1603774
Download citation file: