Photodiode Cutoff Wavelength | Definition, equation, calculator
This page describes Photodiode Cutoff Wavelength definition. It mentions Photodiode Cutoff Wavelength equation/formula and Photodiode Cutoff Wavelength calculator.
Definition:
To build up leakage current in the photodiode, the energy of the photon must be taken greater
than or equal to the energy band gap between the valance and conduction band called band gap (Eg).
➨ h*v > = Eg
h*c/λ > = Eg or λ < = h*c/Eg
So the threshold for the conduction or detection, is commonly called as the long wavelength cutoff point (λc).
λc = h*c/Eg
Photodiode Responsivity Calculator
Example of Photodiode Responsivity calculator:
INPUTS : Eg = 1.42 eV
OUTPUTS: λ = 873.23 nm
Photodiode Cutoff Wavelength Equation | Photodiode Cutoff Wavelength Formula
Following equation or formula is used for Photodiode Cutoff Wavelength calculator.

Photodiode calculators and terminologies
Photodiode vs Phototransistor
Difference between Photodiode types and PIN diode
Quantum Efficiency
Responsivity
Sensitivity
Useful converters and calculators
Following is the list of useful converters and calculators.
dBm to Watt converter
Stripline Impedance calculator
Microstrip line impedance
Antenna G/T
Noise temp. to NF