or

1
conduction
or
valence
insulator
semiconductor
metal
2
GaAs Brillouin Zone
3
GaAs - direct
Si - indirect
Effective mass not same in all directions.
Constant energy surfaces are ellipsoids
4
Current transport at T0
5
Partially filled bands Current transport at TT0
Energy
E
k
6
Calculation of carrier density
ENERGY
EG
7
Density of States
kz
ky
kx
8
Energy Distribution Function
E2
interaction
E4
Energy
E3
E1
9
Properties of the F-D Distribution
At T0,
At T0
For E-EFgtgtkT
10
Carrier concentration