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To get a n-type semicondcutor from silic...

To get a n-type semicondcutor from silicon, it should be doped with a substance with valence

A

2

B

5

C

3

D

4

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A Group 14 element is to be converted into n-type semiconductor by doping it with a suitable impurity. To which group should this impurity belong ?

Doping mens introduction of small amount of impurities like phosphorus , arsenic or boron into the pure crystal . In pure silicon , ther are four valenices used in bonding with other four adjacent silicon crystal is doped with a group -15 element ( with five valence electron ) such as P, As , or Bi , the structure of the crystal lattic remains unchanged . Out of the five valence electron of group -15 doped element four element are used in normal covalent bonding with silicon while fiffth electron is delcoasiled and thus conducts electricity Doping a silicon crystal with a group -13 element (with three valence electrons ) such as B, Al, Ga or In products a semiconductor with three electrons in in dopant . The place where fourth electron is missing is called an electron vacancy or hole . Such hole can move throught the crystal like a positive charge giving rise conduction of electricity. No. of valene electrons in silicon are :

Doping mens introduction of small amount of impurities like phosphorus , arsenic or boron into the pure crystal . In pure silicon , ther are four valenices used in bonding with other four adjacent silicon crystal is doped with a group -15 element ( with five valence electron ) such as P, As , or Bi , the structure of the crystal lattic remains unchanged . Out of the five valence electron of group -15 doped element four element are used in normal covalent bonding with silicon while fiffth electron is delcoasiled and thus conducts electricity Doping a silicon crystal with a group -13 element (with three valence electrons ) such as B, Al, Ga or In products a semiconductor with three electrons in in dopant . The place where fourth electron is missing is called an electron vacancy or hole . Such hole can move throught the crystal like a positive charge giving rise conduction of electricity. Silicon that has been dopend with group - 15 elements is called :

Doping mens introduction of small amount of impurities like phosphorus , arsenic or boron into the pure crystal . In pure silicon , ther are four valenices used in bonding with other four adjacent silicon crystal is doped with a group -15 element ( with five valence electron ) such as P, As , or Bi , the structure of the crystal lattic remains unchanged . Out of the five valence electron of group -15 doped element four element are used in normal covalent bonding with silicon while fiffth electron is delcoasiled and thus conducts electricity Doping a silicon crystal with a group -13 element (with three valence electrons ) such as B, Al, Ga or In products a semiconductor with three electrons in in dopant . The place where fourth electron is missing is called an electron vacancy or hole . Such hole can move throught the crystal like a positive charge giving rise conduction of electricity. Silicon that has been dopend with group - 13 elements is called :

An n-type semiconductor is the one which has excess of free electrons and p-type semiconductor is deficient in these. When a p-n junction is formed, the electrons should flow from n to p region. But all the electrons do not do so. Explain, why.

MODERN PUBLICATION-SOLID STATE-EXERCISE
  1. Schottky defect is observed in crystal when

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  2. Which of the following is true about the charge acquired by p type sem...

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  3. To get a n-type semicondcutor from silicon, it should be doped with a ...

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  4. The total number of tetrahedral voids in the face centred unit cell is

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  5. Which of the following is not correct for Frenkel defect in crystals?

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  6. The percentage of empty space in a body centre cubic arrangement is

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  7. In which part most efficiency packing is present?

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  8. Which of the following statement is not true

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  9. In which of the following structureds coordination number for cations ...

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  10. What is the coordination number in a square close packed structure in ...

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  11. Which kind of defects are introduced by doping?

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  12. Silicon doped with electron rich impurity forms

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  13. Which of the following statements is not true?

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  14. Which of the following is not true about the ionic solids?

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  15. A ferromagnetic substance becomes a permanent magnet when it is placed...

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  16. The correct order of the paking efficiency in different types of unit ...

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  17. Which of the following defects is also known as dislocation defect?

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  18. In the cubic close packing, the unit cell has

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  19. The edge lengths of the unit cells in terms of the radius of spheres c...

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  20. Name three common fruits that are known as Rabi harvests?

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