HSC Science (Electronics) 12th Board ExamMaharashtra State Board
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Distinguish Between Intrinsic and Extrinsic Semiconductor. (Give Any Two Points). - HSC Science (Electronics) 12th Board Exam - Physics

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Question

Distinguish between intrinsic and extrinsic semiconductor. (Give any two points).

Solution

  Intrinsic semiconductors Extrinsic semiconductors
1) Semiconductor in the pure form is known as intrinsic
semiconductor.
The semiconductor, resulting from mixing of impurity in it, is known as extrinsic semiconductor
2) Their conductivity is low Their conductivity is high.
3) 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
4) The number of free electrons in conduction band is equal to the number of holes in valence
band.
In these semiconductors, number of free electrons and number of holes are unequal
5) These are not practically used These are practically used
6) In these, the Fermi energy level lies in the middle of valence band and conduction band. In these, the Fermi energy level shifts towards valence or conduction energy band.

 

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APPEARS IN

 2015-2016 (July) (with solutions)
Question 6.1 | 2.00 marks
Solution Distinguish Between Intrinsic and Extrinsic Semiconductor. (Give Any Two Points). Concept: Extrinsic Semiconductor.
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