is the difference between the difference between intrinsic a

is the difference between the difference between intrinsic and extrinsic semiconductors? the following Figure: Electron energy 4 N states 0 electrons Conduction band 6 N states 2N electrons 3p 4N states 3 s ANelectrons 2N states Valence 2N electrons band 5.43 A Lattice spacing Figure 1.11

Solution

13)

Intrinsic semiconductors:   Extrinsic semiconductors:

1) These are pure semi-conducting materials and 1) When some impurity is added in the intrinsic no impurity atoms are added to it.   semiconductor, extrinsic semiconductors can be

For example: The crystals of pure elements like produced.

germanium and silicon are considered as

Intrinsic Semiconductor.

2) the number of electrons 2) the number density of electrons is not equal to the

is equal to the number of holes. i.e., ne=nh. number of holes.

3) The electrical conductivity is low. 3) The electrical conductivity is high.

14)

conduction band represents extrinsic semiconductors and valance band represents intrinsic semiconductors.