Physics - Semiconductors Question with Solution | TestHub

Band gap is the energy gap between conduction and valence band



For excitation of$e^{-}$from valence band to conduction band

$E_{\mathit{phton}}\ge E_g$

$\frac{\mathit{hC}}{\lambda }\ge E_g$

${\text{E}}_{\text{g}}=\frac{\text{1240}\text{eV} }{\lambda \text{(nm)}}$

${\text{E}}_{\text{g}}=\frac{\text{1240 eV} }{\text{2480} }=\text{0.5 }\text{eV}$