Question

Larger the bandgap the more insulating the material . True or false

Answer 1

The correct answer is true.

Bandgap refers to the energy gap or energy difference between the valence band( top) and the conduction band( bottom) in semi- conductors and also insulators.

It is the energy required to transfer a valence electron and promote it for conduction( for it to become a conducting electron), as a result of which it becomes free to move and thereby conduct electricity.

Therefore, bandgap determines electrical conductivity and have a direct relationship. So, greater the bandgap, greater is the energy required to convert an electron into a conducting one and hence it behaves more as an insulator.

Answer 2

Yes it is true. Larger the band gap the more insulating the material. Bandgap is nothing but the difference in electron volts. Substances which have very large band gaps are insulators and those with small band gaps are conductors.

This is because  in large band gaps the free electrons cannot move from the valence to the conduction band and cannot transfer current.So the material becomes an insulator.