A semiconductor photodiode is a:
Correct answer: A. Reverse-biased junction diode
- A. Reverse-biased junction diode
- B. Forward-biased junction diode
- C. Half wave rectifier
- D. Full wave rectifier
- E. Transistor
Explanation
The photodiode is reverse biased for operating in the photoconductive mode. As the photodiode is in reverse bias the width of the depletion layer increases. This reduces the junction capacitance and thereby the response time. In effect, the reverse bias causes faster response times for the photodiode.
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About Electronics
A p-n junction forms when p-type and n-type semiconductor regions meet, creating a depletion layer, barrier potential and rectifying action. The work covers forward and reverse bias, junction current, diode characteristics, and how a diode converts alternating current into pulsating direct current through half-wave and full-wave rectification.
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