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Photodetector Characteristics

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Questions and Answers

What is the primary function of photodiodes?

To detect photons and sense light (correct)
To amplify light signals
To convert light into electrical energy
To filter out unwanted light wavelengths

What happens when photons excite carriers in a reverse-biased pn junction?

A very small current proportional to the light intensity flows (correct)
A large current flows through the photodiode
The photodiode stops functioning
The photodiode becomes forward-biased

How does the sensitivity of photodiodes depend on light?

It is independent of light characteristics
It depends on the frequency of light
It depends on the intensity of light
It depends on the wavelength of light (correct)

What is the relation between the current through a phototransistor and the incident light intensity?

The current is directly proportional to the intensity (B) Signup and view all the answers

What is the process by which photodetectors create an electron-hole pair?

Absorption of photons (B) Signup and view all the answers

What is the role of bias voltage in a photodiode?

It moves carriers through the material and induces a current in the external circuit (A) Signup and view all the answers

What is the equation that governs the operation of a photodiode?

The standard diode equation (C) Signup and view all the answers

What is the term for the current that flows through a photodiode when it is not sensing light?

Leakage current (D) Signup and view all the answers

What is the relationship between the photocurrent and the number of electron-hole pairs created?

One electron-hole pair creates one photocurrent (A) Signup and view all the answers

What is the characteristic of phototransistors that distinguish them from photodiodes?

Internal amplification (D) Signup and view all the answers

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