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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

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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?

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CP SINGH-SEMICONDUCTORS-Exercises
  1. Electric conduction in a semiconductor takes place due to

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  2. In a semiconductor, (i)there are no free elctrons at 0K (ii) there...

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  3. A pure semiconductor has

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  4. when the electrical conductivity of a semiconductor is due to the brea...

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  5. In an intrinsic semiconductor

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  6. Let n(p) and n(e), be the numbers of holes and condution electrons in ...

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  7. If tempreture is increased, the number of electron-hole pairs increase...

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  8. A strip of copper and another of germanium are cooled from room tempre...

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  9. An electric field us applied to a semiconductor.Let the number of char...

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  10. Solids having highest energy level partially filled with electrons are

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  11. In semiconductors at a room tempreture

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  12. The state of the energy gained by valence electrons when the temperatu...

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  13. Energy band in solids are a consequence of

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  14. Which of the following is semi-conductor?

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  15. Carbon , silicon and germanium have four valence elcectrons each . The...

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  16. Carbon , silicon and germanium have four valence electrons each . At r...

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  17. C and Si both have same lattice structure, having 4 bonding electrons ...

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  18. The difference in the variation of resistance with temperature in a me...

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  19. The probbility of electrons to be found in the conduction band of an i...

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  20. In a semiconducting material the mobilities of electrons and holes are...

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