what is energy gap in band theory? Compare it's size in conductor , semiconductor and insulator?

Answer 1

energy gap is difference of energies of valence band and conduction band.

Energy gap for conductors is ------- valence band and conduction band overlap each other so there is no gap.

for insulators it is very big

for semiconductors it is in between conductors and insulators
eg for germanium it is .7 ev

Answer 2

Semiconductor Band Theory

Answer 3

The enegry gap in band thoery is the diffetent between the two energy level, one which is the highest enegry level containing electrons and the lowest energy level that does not have any electron. The size in which it increases is conductor < semiconductor < insulator. The larger the band gap is the more energy is required to promote an electron up an enegry level. The more harder it is the more insulating the materials becomes.

Answer 4

The energy required by the electrons to move from a lower energy ban to a higher energy band is called energy gap.

For conductor, the energy gap is low and so, the external energy required to push the electrons to valance band (the outer most band) is very low.

For semi - conductor, the energy gap is medium and a considerable amount of energy is required to pump the electrons to the valance band. To convert semi - conductor into conductor, impurities are added and the process is called doping. for example, Germanium in added with silicon to make silicon a conductor.

For insulators, the energy gap is large and it is not possible by supplying them any external energy to make them conductor.

Answer 5

conductors semiconductors insulators
conductionlayr conductionlayr conductionlay
depletion layr depletionlayr depletionlayr
enrgylayr enrgylayr energylayr
if the depletio gap is more it is an insulator.
if the depletion gap is mediem it acts as semiconductor. if the depletion layre is vry thin then it acts as conductor or metal.