Semiconductor devices: Why are suitable impurities (dopants) intentionally added to a pure semiconductor? State the primary objective of doping for electronic applications (diodes, transistors, ICs). Choose the correct option.

Difficulty: Easy

To strengthen the crystal mechanically
To increase its electrical conductivity by increasing free carriers (form n-type or p-type)
To raise its melting point significantly
To make it an ideal thermal insulator

Correct Answer: To increase its electrical conductivity by increasing free carriers (form n-type or p-type)

Explanation:

Concept
Doping introduces donor (n-type) or acceptor (p-type) atoms, raising electron or hole concentration. This lowers resistivity and enables controllable junction behavior.

Result
Devices rely on engineered carrier profiles (pn junctions, MOSFET channels).

Final Answer
To increase its electrical conductivity by increasing free carriers (form n-type or p-type)

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Semiconductor devices: Why are suitable impurities (dopants) intentionally added to a pure semiconductor? State the primary objective of doping for electronic applications (diodes, transistors, ICs). Choose the correct option.

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