is a photodiode example of photoelectric effect ?

Asked by kaka001 | 6th Nov, 2010, 12:00: AM

Expert Answer:

Dear student
Yes.
Photodiode is based on the principle of photoelectric effect.
 
The working principle of photodiode is:
A photodiode is a PN junction. When a photon of sufficient energy strikes the diode, it excites an electron, thereby creating a free electron and a (positively charged electron) hole. If the absorption occurs in the junction's depletion region, these carriers are swept from the junction by the built-in field of the depletion region. Thus holes move toward the anode, and electrons toward the cathode, and a photocurrent is produced.
 
We hope that resolves your query.
 
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Answered by  | 7th Nov, 2010, 06:26: AM

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