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A photodiode is used to detect light. It is normally… | StemPy Lab
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A photodiode is used to detect light. It is normally connected in reverse bias. Why?
Physics
Medium
High School (11–12)
Electronics › Semiconductors and Diodes
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A photodiode is used to detect light. It is normally connected in reverse bias. Why?
In forward bias light cannot reach the junction
In reverse bias the current is tiny without light, so the extra current made by light is a large fraction of it and easy to measure
In reverse bias the diode conducts a large current, which light then switches off
A photodiode works only in reverse bias, because light makes holes only then
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