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Q. 14.7 A p-n photodiode is fabricated from a semiconductor with bandgap of Can it detect a wavelength of
Answers (1)
Given
energy band gap of photodiode is 2.8eV.
wavelength = = 6000nm =
Energy of signal will be
where c is speed of light(300000000m/s) , h is planks constant ( = )
putting the corresponding value
Energy of signal =
=
=
The energy of the signal is 0.207eV which is less than 2.8eV ( the energy and gap of photodiode). Hence signal can not be detected by the photodiode.
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