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kartikwat
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When studying about semiconductos what are the valence band and conductivity band .what are its properties,where is it addressed.
A semiconductor is a material that has properties between those of a conductor and an insulator. It can conduct electricity under certain conditions and is commonly used in electronic devices.
In semiconductors, conduction of electricity occurs through the movement of electrons. These electrons are able to move through the material when excited by an external energy source, such as heat or light.
The band gap in a semiconductor is the energy difference between the valence band (where electrons are bound to atoms) and the conduction band (where electrons are able to move freely). This energy gap determines the conductivity of the material.
Semiconductors can be doped by introducing impurities into the material. This changes the number of free electrons or "holes" in the material, altering its conductivity. This process is crucial in creating different types of semiconductors for various electronic devices.
N-type semiconductors have been doped with atoms that have extra electrons, creating an excess of negative charge carriers. P-type semiconductors have been doped with atoms that are missing electrons, creating an excess of positive charge carriers. This difference in charge carriers affects the conductivity of the material.