(1) Define intrinsic semiconductor and extrinsisemiconductor.

1.	(1) Define intrinsic semiconductor and extrinsisemiconductor.
Answer» Anintrinsic semiconductoris an undopedsemiconductor. Thismeansthat holes in the valence band are vacancies created by electrons that have been thermally excited to the conduction band, as opposed to doped semiconductorswhere holes or electrons are supplied by a “foreign” atom acting as an impurity. Anextrinsic semiconductoris asemiconductordoped by a specific impurity which is able to deeply modify its electrical properties, making it suitable for electronic applications (diodes, transistors, etc.) or optoelectronic applications (light emitters and detectors).

Answer»

Anintrinsic semiconductoris an undopedsemiconductor. Thismeansthat holes in the valence band are vacancies created by electrons that have been thermally excited to the conduction band, as opposed to doped semiconductorswhere holes or electrons are supplied by a “foreign” atom acting as an impurity.

Anextrinsic semiconductoris asemiconductordoped by a specific impurity which is able to deeply modify its electrical properties, making it suitable for electronic applications (diodes, transistors, etc.) or optoelectronic applications (light emitters and detectors).

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