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What are semi-conductors ? Describe the ...

What are semi-conductors ? Describe the two main types of semiconductors and contrast their conduction mechanisms.

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Semi-conductors are the solids whose conductivity lies in between those of conductors and insulators. It normally ranges between `10^(-6)` to `10^(4)ohm^(-1)cm^(-1)`. Two main types of semi-conductors are : n-type semi-conductors , p-type semi-conductors.
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