Distinguish between photo current and dark current.

Asked by Topperlearning User | 19th Jun, 2014, 02:11: PM

Expert Answer:

When light of certain frequency reaches the p-n junction and if the energy of the photon is greater than the gap energy, the photon entering the junction breaks the covalent bond and produce electron -hole pair.The resulting current is called the photo current.

When there is no light the reverse saturation current flowing is called dark current.

Answered by  | 19th Jun, 2014, 04:11: PM