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प्रश्न
Two crystals C1 and C2, made of pure silicon, are doped with arsenic and aluminium respectively.
Why is doping of intrinsic semiconductors necessary?
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उत्तर
Doping is necessary to increase the conductivity of semiconductors at normal temperatures.
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संबंधित प्रश्न
In an intrinsic semiconductor the energy gap Egis 1.2 eV. Its hole mobility is much smaller than electron mobility and independent of temperature. What is the ratio between conductivity at 600K and that at 300K? Assume that the temperature dependence of intrinsic carrier concentration niis given by
`"n"_"i" = "n"_0 exp(- "E"_"g"/(2"k"_"BT"))`
where n0 is a constant.
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 ______.
In a pure or intrinsic semiconductor, valence band holes and conduction-band electrons are always ______.
Answer the following giving reasons:
Impurities are added to intrinsic semiconductors.
Identify the WRONG statement from the following. In an intrinsic semiconductor ______.
What is an intrinsic semiconductor?
What must electrons cross to become free charge carriers as the temperature rises?
Which charge carriers contribute to conduction in an intrinsic semiconductor?
How does the conductivity of an intrinsic semiconductor compare with that of an extrinsic semiconductor?
