With which one of the following elements silicon should be doped so as to give p-type of semiconductor ? [2008]a)Germaniumb)Arsenicc)Seleniumd)BoronCorrect answer is option 'D'. Can you explain this answer?

Question

Answer

The n-type semiconductors are obtained when Si or Ge are doped with elements of group 15, eg, arsenic (As),

while p-type semiconductors are obtained when Si or Ge are doped witlh traces of elements of group 13, ie, indium (In), boron (B).

Note : The conductivity of semiconductors increases with rise in temperature

Answer

Introduction:
Silicon can be doped with different elements to alter its conductivity. When doped with certain elements, it can become a p-type semiconductor.

Doping with Boron:
- Boron is typically used to dope silicon and create p-type semiconductors.
- Boron has one less valence electron than silicon, so when it is introduced into a silicon crystal lattice, it creates 'holes' where electrons can move, resulting in a positive charge.

Process of Doping:
- During the doping process, boron atoms replace some silicon atoms in the crystal lattice.
- The boron atoms accept electrons from neighboring silicon atoms, creating a positive charge.

P-type Semiconductor Formation:
- The presence of boron atoms with fewer electrons results in a surplus of 'holes' or positive charge carriers in the silicon crystal.
- This excess of positive charge carriers gives rise to the p-type semiconductor behavior.

Conclusion:
Doping silicon with boron is essential for creating p-type semiconductors by introducing positive charge carriers into the crystal lattice.

Similar Class 12 Doubts

Select the correct statement(s).

To obtain a p-type germanium semiconductor,it must be doped with [1997]

When arsenic is added as an impurity to silicon,the resulting material is [1996]

A p- type semiconductor can be obtained by adding

A p- type semiconductor can be obtained by adding

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