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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 reststance which increases with temperature

Text Solution

Verified by Experts

The correct Answer is:
C
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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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NIKITA PUBLICATION-SEMICONDUCTORS-MCQS
  1. The resistivity of a semiconductor at room temperature is in bet...

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  2. Which of the following is correct about the nature of net charge on...

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  3. A pure semiconductor has

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  4. The majority charge carriers in P -type semiconductor are

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  5. To obtain a P-type germanium semiconductor, it must be dopped with

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  6. An n-type semiconductor is

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  7. An n-type germanium is obtained, on doping intrinsic germaniurn, by

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  8. In an n-type semiconductor, the concentration of minority carriers mai...

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  9. When arsenic is added as an impurity to silicon, the resulting materia...

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  10. Semiconductor of both p-type and n-type are produced by

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  11. Semiconductor is damaged by the strong current due to

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  12. A p-type semiconductor is (i) a silicon crystal doped with arsenic i...

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  13. A hole in a P - type semiconductor is

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  14. In an n-type semiconductor donor level is

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  15. In a n-type semiconductor, which of the following statement is true?

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  16. The forbidden energy gap is maximum in

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  17. When boron is added as an impurity to silicon,the resulting material i...

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  18. In P-type semiconductor the majority and minorty charge carriers are r...

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  19. When a p-n junction diode is reverse biased the flow of current across...

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  20. If the forward voltage in a diode is increased, the width of the deple...

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