A theoretical model is developed for electron velocity saturation in high power GaN transistors. It is shown that electron velocity at high electric fields is reduced due to heating of electron gas since the high density of nonequilibrium LO phonons cannot efficiently transfer heat to the lattice. However, the resulting degradation of electron velocity is found to be weaker than previously reported. The results are compared with experimental data, and the ways to improve the efficiency of cooling the electron gas to increase the drift velocity are discussed.
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Research Article| December 17 2007
Hot phonon effect on electron velocity saturation in GaN: A second look
Yujie J. Ding;
Jacob Khurgin, Yujie J. Ding, Debdeep Jena; Hot phonon effect on electron velocity saturation in GaN: A second look. Appl. Phys. Lett. 17 December 2007; 91 (25): 252104. https://doi.org/10.1063/1.2824872
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