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प्रश्न
Let np and ne be the numbers of holes and conduction electrons in an extrinsic semiconductor.
विकल्प
np > ne
np = ne
np < ne
np ≠ ne
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उत्तर
np ≠ ne
Extrinsic semiconductors are formed by doping either an n-type material or a p-type material with a pure semiconductor, Thus, it may have more number of holes (if the doping material is of p type) or more number of electrons (if the doping material is of ntype).
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संबंधित प्रश्न
Answer in detail.
Distinguish between intrinsic semiconductors and extrinsic semiconductors.
Let nh and ne be the number of holes and conduction electrons respectively in a semiconductor. Then ______.
Explain the following term:
Intrinsic semiconductor
Hole is ______.
Two crystals C1 and C2, made of pure silicon, are doped with arsenic and aluminium respectively.
Why is doping of intrinsic semiconductors necessary?
Name the two types of atoms used for doping of Ge/Si.
A pure semiconductor has equal electron and hole concentration of 1016 m-3. Doping by indium increases nh to 5 × 1022 m-3. Then, the value of ne in the doped semiconductor is ______.
Answer the following giving reasons:
Impurities are added to intrinsic semiconductors.
- Assertion (A): The resistance of an intrinsic semiconductor decreases with an increase in its temperature.
- Reason (R): The number of conduction electrons as well as hole increase in an intrinsic semiconductor with the rise in its temperature.
What is a semiconductor?
Which materials are common examples of semiconductors?
What happens when some valence electrons gain enough energy as temperature increases?
What is the band occupancy of an intrinsic semiconductor at 0 K?
How does the conductivity of an intrinsic semiconductor change when temperature rises?
What first enables a valence electron to move to the conduction band?
How does the conductivity of an intrinsic semiconductor compare with that of an extrinsic semiconductor?
Which statement about the lattice structure of carbon, silicon, and germanium is correct?
Why are pure semiconductors not usually used directly in most electronic devices?
