Question

A p-n photodiode is made of a material with a band gap of 2.0 eV. The minimum frequency of radiation that can be absorbed by the material is nearly :

Answer 1

Given,

$E_g=2eV$

$h=6.67\times {10}^{-34}J/Hz$

$e=1.6\times {10}^{-19}C$

we know that ,

$E_g=h\upsilon$

$\upsilon =\frac{E_g}{h}=\frac{2\times 1.6\times {10}^{-19}}{6.67\times {10}^{-34}}$

$\upsilon =4.797\times {10}^{14}Hz$