MATS 3011 Lecture Notes - Surinamese Football Association, Electronic Body Music
Document Summary
Intrinsic semiconductors n = # electrons; ef = fermi energy, ec = conduction band energy p = # holes per unit volume. *final exam: 1 full page (1 side) cheat sheet allowed. Intrinsic semiconductor: no additional impurities added to it. Fermi energy is right at the center of the valence and conduction band. # holes and electrons are the same (n = p = ni (amt for intrinsic)) @ some t, you get some electrons going into conduction band --> holes in valence band. Matsci page 1 ni = # intrinsic carriers for a given semiconductor intrinsic semiconductor has less carriers than do metals. By adding al in the si network, we have taken away 1 electron --> created a hole. Al = acceptor --> h+ (adds extra hole) -> now get 1 extra electronthe extra electron is donated When add more atoms, get higher density of states at some energy.
