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प्रश्न
Explain the following term:
Extrinsic semiconductor
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उत्तर
Extrinsic semiconductors are obtained by doping suitable impurity atoms to intrinsic semiconductors to increase their conductivity.
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संबंधित प्रश्न
Distinguish between 'intrinsic' and 'extrinsic' semiconductors
The number of silicon atoms per m3 is 5 × 1028. This is doped simultaneously with 5 × 1022 atoms per m3 of Arsenic and 5 × 1020 per m3 atoms of Indium. Calculate the number of electrons and holes. Given that ni= 1.5 × 1016 m−3. Is the material n-type or p-type?
Electronic configuration of germanium is 2, 8, 18 and 4. To make it extrinsic semiconductor small quantity of antimony is added. The correct statement is ____________.
In n-type semiconductor, the fifth electron ______.
State how a p-type semiconductor will be obtained from a pure crystal of a semiconductor.
Why are elemental dopants for Silicon or Germanium usually chosen from group XIII or group XV?
- Statement I: By doping silicon semiconductor with pentavalent material, the electrons density increases.
- Statement II: The n-type semiconductor has net negative charge. In the light of the above statements, choose the most appropriate answer from the options given below:
In an extrinsic semiconductor, the number density of holes is 4 × 1020 m-3. If the number density of intrinsic carriers is 1.2 × 1015 m-3, the number density of electrons in it is ______.
- Assertion (A): Putting the p-type semiconductor slab directly in physical contact with the n-type semiconductor slab cannot form the pn junction.
- Reason (R): The roughness at contact will be much more than inter atomic crystal spacing and continuous flow of charge carriers is not possible.
With an increase in the temperature, the electrical conductivity of a semiconductor ______.
