Answer in detail.
Distinguish between intrinsic semiconductors and extrinsic semiconductors.
|Sr. No.||Intrinsic semiconductors||Extrinsic semiconductors|
|i.||A pure semiconductor is known as intrinsic semiconductors.||The semiconductor, resulting from mixing of impurity in it, is known as extrinsic semiconductors|
|ii.||Their conductivity is low at room temperature||Their conductivity is high even at room temperature.|
|iii.||Its electrical conductivity is a function of temperature alone.||Its electrical conductivity depends upon the temperature as well as on the quantity of impurity atoms doped in the structure.|
|iv.||The number density of holes (nh) is the same as the number density of free electron (ne)
(nh = ne).
|The number density of free electrons and the number density of holes are unequal.|
Concept: Intrinsic Semiconductor
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