Answer :
Semiconductor materials with band gaps greater than 3.5 ev are considered to be insulators because of high band gap.
What is semiconductor and what the semiconductor materials with band gaps greater than 3.5 ev are considered?
- Semiconductor is a p-n junction in which the p side is the major holes and is in the positive terminal and n side is electrons major in negative side.
- There is a case when the band gaps are less than semiconductor , insulators and metals called superconductors.
- Superconductors have energy band gap much less than the band gaps of metals, semiconductor and insulator.
- Here the question is asked for the kind of semiconductor material with band gaps greater than 3.5 ev.
- Materials with band gap of 1.5 to 3.0 ev are semiconductor , with zero ev are metals, and band gap of greater than 4 ev are insulators.
- Hence the semiconductor materials with band gaps greater than 3.5 ev are considered than 3.5 ev are considered to be insulator.
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