Question

A p-type semiconductor has acceptor energy level 53meV above the valence band. Find the maximum wavelength of light that can creat a hole. Use `h=6.63xx10^(-34)Js, c=3xx10^(8)ms^(-1)`.

Answer 1

Here, `E=53 meV=53xx10^(-3) eV`
`=53xx10^(-3)xx1.6xx10^(-19)J`
`=53xx1.6xx10^(-22)J`
Max. wavelength, `lambda_(max)=(hc)/E`
`=((6.63xx10^(-34))xx(3xx10^(8)))/(53xx1.6xx10^(-22))=2.35xx10^(-5)m`