Photodiode sensitivity | Definition, equation, calculator

This page describes Photodiode sensitivity definition. It mentions Photodiode sensitivity equation/formula and Photodiode sensitivity calculator.

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

Current flowing, Amperes (input1) :

Light irradiance, Watts (input2) :

Photodiode sensitivity (Output1):

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

Photodiode sensitivity Equation | Photodiode sensitivity Formula

Following equation or formula is used for Photodiode sensitivity calculator.

Photodiode sensitivity equation,Photodiode sensitivity formula

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