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 a Photodiode?

• A photodiode is a type of photodetector capable of converting light into either current or voltage. This effect is called the photovoltaic effect.
• A 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 photodiodes include optical disc drives, digital cameras, and optical switches, etc.
• Variants: PIN photodiode, Avalanche photodiode, PN Photodiode, Schottky Photodiode, etc.

The figure depicts the symbol of a Photodiode and one such device from OSRAM.

What is Photodiode Sensitivity?

Definition: The sensitivity of a photodiode is the ratio of the amount of current flow with unit light irradiance. It can be expressed as per the equation below. The dark current can be minimized to enhance the photodiode’s sensitivity.

Photodiode Sensitivity Calculator

Here’s an example of how to use the photodiode sensitivity calculator:

INPUTS:

• I (Current) = 5mA
• H (Irradiance) = 10 mWatt

OUTPUTS:

• S = 0.5

Photodiode Sensitivity Formula

The following formula is used for the 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.