A semiconductor has a band gap of 1.5 eV. What is the minimum wavelength in nm required to promote an electron from the valence to the conduction band?
Not sure where to start :S
Not sure where to start :S
1 Answer
May 14, 2018
Explanation:
To raise an electron from valence to conduction band , the energy required is
equal to the band gap in eV which has a value 1.5 eV as given
If a photon of energy E is absorbed by an electron then for the transfer
E = 1.5 eV = h.
as frequency
substituting the values of h and c and eV in Joules we get