Photodiode Sensitivity Formula and Calculator

Photodiode sensitivity measures a photodiode's ability to detect light and generate an electrical signal. This guide explains the sensitivity formula and its applications in detail. Use our calculator to easily determine the sensitivity of photodiodes, ensuring optimal performance for your projects.

What is Photodiode ?

• A photodiode is a type of photodetector capable of converting light into either current or voltage. This effect is called photovoltaic effect.
• DC source is often used to apply reverse bias to the photodiode. This makes it generate more current. This mode of operation is called photoconductive mode.
• Applications of photodiode include optical disc drives, digital cameras and optical switches etc.
• Variants : PIN photodiode, Avalanche photodiode, PN Photodiode, Schottky Photodiode etc.

The figure depicts symbol of Photodiode and one such device from OSRAM. Refer article on Photodiode basics and types and their working operation.

What is Photodiode sensitivity ?

Definition: The sensitivity of a photodiode is the ratio of amount of current flow with unit light irradiance. It can expressed as per equation below.

The dark current can be minimized in order to enhance the sensitivity of the photodiode.

Photodiode Sensitivity Calculator

Example of Photodiode sensitivity calculator:
INPUTS : I (Current) = 5mA, (H) Irradiance = 10 mWatt
OUTPUTS: S = 0.5

Photodiode sensitivity Formula

Following formula is used for Photodiode sensitivity calculator.

Conclusion

Accurate sensitivity calculations are crucial for evaluating photodiode efficiency. Leverage the formula and calculator provided to enhance your understanding and optimize your photodiode based systems.

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