Forbidden - band - was created in 1985.

There sure is, if you go to facebook and look for Forbidden Fruit Band you should find them with no problems.

it is the energy required to transfer an electron from valence band to conduction band, the external energy which is required is equal to the forbidden energy gap

forbidden energy gap or energy gap or band gap or band or Eg is the gap between the top of the valance band and bottom of the conduction band. If we apply the energy equivalent to Eg then the electrons in valance band will jump to the conduction band. Ravinder kumar meena stpi n depletion region is the region in semiconductor where there is depletion of free charge carriers.Ravinder kumar meena stpi n

Yes it is. Most Sn (tin) materials as semiconductors are direct band gap materials. Silicon on the other hand is an indirect band gap material.