Day 35 intrinsic and extrinsic semiconductors

0:00 mystery prizes for best HW9 presentation
2:00 reading quiz
6:23 Thermoelectric cooler/generator demonstration and discussion
13:10 band gap changes with interatomic separation
14:00 understanding metals vs semiconductors vs insulators using band diagrams, conduction band, valence band
18:46 Fermi level
23:59 Fermi-Dirac distribution
26:24 Fermi distribution to explain intrinsic semiconduction
29:35 electron mobility, drift velocity
35:57 calculating electrical conductivity from charge carrier density, carrier charge, and electron/hole mobility
40:01 Matthiesen's rule
42:08 intrinsic vs extrinsic semiconductors
44:30 doping semiconductors n and p type
48:30 freeze-out, extrinsic, and intrinsic temperature regimes