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(i) Explain the process of diffusion in semiconductor material. (ii) Explain Hall effect.
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(i) Diffusion: In a semi conductor bar a concentration gradient exist when either number of electrons or holes is greater in one region of a semi conductor as compared to other region.

When such concentration gradient exist, the carriers (electrons/holes) move from the region of higher concentration to lower concentration this process is called as diffusion.


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(ii) Hall Effect: If a piece of metal or semiconductor carrying current “I” is placed in a transverse magnetic field „B‟ then an electric field „E‟ is induced in the direction perpendicular to both I and B.

Hall effect is used to determine whether a semiconductor is N type or P type, and to find carrier concentration

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