Question

Find the maximum wavelength of electromagnetic radiation which can create a hole-electron pair in germanium. the band gap in germanium is 0.65 eV.

Answer 1

Band Gap $=0.65eV,\lambda =?$

$E=\frac{hc}{\lambda }$

or $\lambda =\frac{hc}{E}=\frac{1242}{0.65}$

$=1910.7\times {10}^{-9}{m}^{\prime }$

$=1.9\times {10}^{-6}m$