Semiconductors Flashcards
1
Q
Resistivity range of semiconductors
A
10^-5 to 10^6
2
Q
Conductivity range of semiconductors
A
10^5 to 10^-6
3
Q
Fermi level?
A
Highest energy level in conduction band occupied by electrons
4
Q
Fermi energy?
A
Energy corresponding to fermi level is called Fermi energy
5
Q
Example of pentavalent dopants
A
Phosphorous(P)
Arsenide(As)
Antimony (Sb)
6
Q
Examples of trivalent dopants
A
Gallium(Ga)
Aluminium(Al)
Indium(In)
Boron(B)
7
Q
Examples of inorganic semiconductors
A
Cadmium Sulphide(CdS) Gallium Arsenide(GaAs) Cadmium Serelium(CdSe)
8
Q
Examples of organic semiconductors
A
Anthracene
Doped semiconductor-phalocyanines
9
Q
For pure semiconductor
A
Ne=Nh=Ni
10
Q
Relationship between Ne,Nh and Ni
A
Ne x Nh = Ni^2
11
Q
Mobility?
A
Drift velocity/E
Conductivity/ne
1/ne(resistivity)
SI unit = m2 V-1 s-1
Where E is electric field
n=(N x density)/A
12
Q
Resistivity =?
A
RA/I
13
Q
Conductivity
A
e(NhxUh + NexUe)
