A p-type semiconductor has acceptor energy levels 57 meV(millielectron volt) above the valence band.Find the maximum wavelength of the radiation,which can create a hole?

A doped semiconductor has impurity levels 40 MeV (millielectron volt) below the conduction band Is the material n-type or p-type?

A semiconductor has accpetor level 1.57 eV above the valence band.What is the maximum wavelength of light required to create a hole?Given that 1 eV=1.6 xx 10^(-19)J and h=6.62 xx 10^(-34) Js .

A doped semiconductor has impurity levels 40 MeV (millielectron volt) below the conduction band In a thermal collision,an amount of energy k T is given ot the extra electron loosely bound to the impurity ion and this electron is just able to jump into the conduction band.Calculate the temperature T. Given,Boltzmann's constant , k=8.62 xx 10^(-5) eV K^(-1) .

The energy liberated in the ecombination of hole-electron pair is converted into electromagnetic radiation. If the maximum wavelength emitted is 500 nm, find value of forbidden energy gap.