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CBSE Class 12-science Answered

Compare p-type and n-type conductor.
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
answered-by-expert Expert Answer
In doped semiconductors, extra energy levels are added by adding impurity which is electron rich or electron deficient as compared to intrinsic semiconductors like silicon and germanium.

Crystals doped with P and As electron rich to form n- type semiconductors these impurities atom that has five valence electrons is added because only four are needed for bonding it creates an electron that is free to move.
 Crystals doped with electron deficient elements B, Al etc to form   p-type semiconductors. The impuritiy atom that has only three valence electrons is added, thus creating a hole in p-type (positive) to the semiconductor. Diode is a combination of n-type and p-type conductor used in rectifiers. npn & pnp are used in amplifying audio signals. Solar cell is photo-diode.

Answered by | 04 Jun, 2014, 03:23: PM

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