Larger the bandgap the more insulating the material
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It has very few electrons and holes because it has very few (effective) dopant atoms, not because it has abigger bandgap than other GaAs. Semi-insulating GaAs is still GaAs. Normally, the bandgap of a semiconductor is a fixed materialproperty. GaAs always has 1.4eVbandgap, silicon always has 1.1eVbandgap, etc.
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here is your answer
It has very few electrons and holes because it has very few (effective) dopant atoms, not because it has abigger bandgap than other GaAs. Semi-insulating GaAs is still GaAs. Normally, the bandgap of a semiconductor is a fixed materialproperty. GaAs always has 1.4eVbandgap, silicon always has 1.1eVbandgap, etc.
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siddharthadiwakar:
correct but not fully
no it is fully
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Bandgap is also known as energy gap or energy difference between the two bands- conduction band and valence band.
It can be described as the energy required to convert a valence electron into a conducting electron such that it conducts electricity.
Hence, greater the bandgap, greater is the energy required for the promotion of the valence electron to a conducting one and so it conducts less electric current and therefore, having more of an insulating property.
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