First slide

Opto electronic juction devices

Question

In a p-n junction photocell, the value of the photo electromotive force produced by monochromatic light is proportional to

Moderate

A

the barrier voltage at the p-n junction
B

the intensity of the light falling on the cell
C

the frequency of the light falling on the cell
D

the voltage applied at the p-n junction

Solution

When a light (wavelength sufficient to break the covalent bond) falls on the junction, new hole-electron pairs are created. No. of produced electron-hole pairs depends upon no. of photons . So photo-emf or current is proportional to intensity of light.

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