Distinguish between intrinsi and extrinsic semiconductors.


Semiconductors are the materials which have a conductivity between conductors known as metals and non-conductors or insulators such ceramics. Semiconductors can be compounds such as gallium arsenide or pure elements, such as germanium or silicon. Semiconductors can be classified as intrinsic semiconductors and extrinsic semiconductors. The difference between the two is explained below.

Intrinsic Semiconductor

Extrinsic Semiconductor

Pure type of semiconductor

Impure type of semiconductor

Density of electrons is equal to the density of holes

Density of electrons is not equal to the density of holes

Electrical conductivity is low

Electrical conductivity is high

Dependence on temperature only

Dependence on temperature as well as on the amount of impurity

The bandgap between conduction (C.B) and valence band (V.B) is small.

The energy gap is higher than the intrinsic semiconductors.

Examples: Si, Ge

Examples: GaAs, GaP

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