Question

A p-n photodiode is fabricated from a semiconductor with band gap of 2.8 eV. Can it detect a wavelength of 6000 nm?

Answer 1

Here, λ = 600 nm = 600 x 10^-9m

Therefore, energy associated with the wavelength,

As the energy associated with the wave length is less than the band gap energy of the semiconductor, it can’t detect this wave length.