In FET as the temperature increases its mobility decreases. Why?
As far I know as the temperature increases more electrons are getting generated resulting in population inversion & thus electron mobility increases but recently I came across FET in which just the opposite phenomena occurs. Why?
Dear,
As temperature increases, lattice vibrations increase and the probability of an electron being scattered by the lattice increases; thus, high temperature mobilities are limited by phonon scattering causing mobility to decrease as temperature increases.