Semiconductors Flashcards
1
Q
Define intrinsic conduction
A
When a semiconductor is heated and a ‘hole’ (electron vacancy) is left.
2
Q
Define extrinsic condution
A
-Doping a pure semiconductor material to produce n-type and p-type materials
3
Q
How are n-type materials made?
A
-Pentavalent atoms are added to tetravalent atoms (silicon)
-This forms an electron that isnt bonded to anything, allowing flow of current
4
Q
How are p-type materials made?
A
-Trivalent atoms are added to tetravalent atoms
-This creates electron vacancies (holes)
-The material behaves as a positive charge.
5
Q
Define resistivity
A
Inversely proportional to conductivity
6
Q
Give 3 examples of tetravalent elements
A
Carbon, Silicon, Geranium
7
Q
Give 3 examples of trivalent elements
A
Boron, Aluminium, Gallium
