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A pure semiconductor has...

A pure semiconductor has

A

an infinite resistance at `0^(@)C`

B

`a finite resistance which does not depend upon temperature

C

a finite resistance which decrease with temperature

D

a finite resistance which increase with temperature

Text Solution

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The correct Answer is:
C
NA
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A pure semiconductor germanium or silicon, free of every impurity is called intrinsic semiconductor. A room temperature, a pure semiconductor has a very small number of current carriers (electrons and holes). Hence, its conductivity is low. When the impurity atoms of valence five or three are doped in a pure semiconductor, we get repectively n-type ot p-type extrinsic semiconductor. In case of a doped semiconductor. n_(e)n_(h)=n_(i)^(2) , where n_(e) and n_(h) are the number density of electrons and holes respectively and n_(i) is the number density of intrinsic charge carriers in a pure semiconductor. The conductivity of extrinsic semiconductor is much higher than that of intrinsic semiconductor. (i) Name two materials to be doped in pure semiconductor of silicon to get p-type semiconductor n-type semiconductor. (ii) What do you learn from the above study?

Name two factors on which electrical conductivity of a pure semiconductor at a given temperature depends.

Knowledge Check

  • A pure semiconductors

    A
    has low resistance.
    B
    is an intrinsic semiconductor.
    C
    allows inadequate current to pass through it.
    D
    is an extrinsic semiconductor.

  • A pure semiconductor is ………. .

    A
    an extrinsic semiconductor
    B
    an intrinsic semiconductor
    C
    p-type semiconductor
    D
    n-type semiconductor

  • A pure semiconductor behaves slightly as a conductor at

    A
    Room temperature
    B
    Low temperature
    C
    High temperature
    D
    Both `(b)` and `(c)`

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