Hot phonon effect on electron velocity saturation in GaN: A second look

Hot-Phonon Effect on the Reliability of GaN-Based Heterostructure Field-Effect Transistors

GaN-based high electron mobility transistors (HEMTs) are among the most promising devices for high power radio frequency (RF)/microwave (MW) and switching applications owing to their high breakdown voltage, high electron density, and high electron saturation velocity.[1,2] In fact, GaN HEMTs are currently employed in RF/MW high power amplifiers, low-noise amplifiers (LNA), and RF switching modu...

Effect of hot phonon lifetime on electron velocity in InAlN/AlN/GaN heterostructure field effect transistors on bulk GaN substrates

2-d Simulation of Hot Electron-phonon Interactions in a Submicron Gallium Nitride Device Using Hydrodynamic Transport Approach

In this study, a thermal and electrical coupled device solver is developed to simulate the energy transfer mechanism within a GaN FET with a gate length of 0.2 mm. The simulation simultaneously solves a set of hydrodynamic equations (derived from the Boltzmann Transport Equation) and the Poisson equation for electron, optical phonon and acoustic phonon energies, electron number density, electri...

High-field transport in two-dimensional graphene

Transport of carriers in two-dimensional graphene at high electric fields is investigated by combining semianalytical and Monte Carlo methods. A semianalytical high-field transport model based on the high rate of optical phonon emission provides useful estimates of the saturation currents in graphene. For developing a more accurate picture, the nonequilibrium (hot) phonon effect and the role of...

Investigation of Hot Electrons and Hot Phonons Generated within an AlN/GaN High Electron Mobility Transistor

We review our recent results obtained on an AlN/GaN-based high-electron-mobility transistor. The temperature of the electrons drifting under a relatively-high electric field is significantly higher than the lattice temperature (i.e., the hot electrons are generated). These hot electrons are produced through the Fröhlich interaction between the drifting electrons and long-lived longitudinal-opti...