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प्रश्न
Answer the following question.
Why photodiodes are required to operate in reverse bias? Explain.
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उत्तर
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. The photocurrent is linearly proportional to the illuminance.
संबंधित प्रश्न
What causes the setting up of high electric field even for small reverse bias voltage across the diode?
The dynamic plate resistance of a triode value is 10 kΩ. Find the change in the plate current if the plate voltage is changed from 200 V to 220 V.
With reference to a semiconductor diode, what is meant by:
(i) Forward bias
(ii) Reverse bias
(iii) Depletion region
Diffusion in a p-n junction is due to ______.
Of the diodes shown in the following diagrams, which one is reverse biased?
Use a transistor as an amplition
In a semiconductor diode, the barrier potential offers opposition to only
The breakdown in a reverse biased p–n junction diode is more likely to occur due to ______.
- large velocity of the minority charge carriers if the doping concentration is small.
- large velocity of the minority charge carriers if the doping concentration is large.
- strong electric field in a depletion region if the doping concentration is small.
- strong electric field in the depletion region if the doping concentration is large.
Can the potential barrier across a p-n junction be measured by simply connecting a voltmeter across the junction?
Describe the following term briefly:
Minority carrier injection in forward biasing.
