Silicon doped with gallium forms _________.
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. p-type semiconductor.
When silicon (which has 4 valence electrons) is doped with gallium (which has 3 valence electrons), it creates a P-type (positive-type) semiconductor.
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Gallium acts as an acceptor impurity, creating holes (positive charge carriers) in the silicon crystal.
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These holes can move through the lattice and conduct electricity, which is the basis of P-type conductivity.