What is the responsivity of the photodiode?
What is the responsivity of the photodiode?
Photodetector responsivity (defined by Equation 1.2. 2 in Chapter 1) is a measure of optical-to-electrical conversion efficiency of a photodetector and is usually expressed by the value of the photocurrent (mA) generated by each milliwatt of optical signal.
How is spectral responsivity calculated?
To determine a device’s spectral responsivity, one must know the power or irradiance reaching the test device at each wavelength and the current produced by the device at each of those wavelengths. In this system, the power is measured with a calibrated photodiode or a pyroelectric radiometer.
What is the responsivity of light detector?
Responsivity is defined as the output signal (typically voltage or current) of the detector produced in response to a given incident radiant power falling on the detector.
How is responsivity calculated?
How to calculate the responsivity
- = Photon Detection Efficiency.
- = Wavelength.
- = Gain.
- = Electron Charge.
- = Afterpulsing Probability.
- = Crosstalk Probability.
- = Planck Constant.
- = Speed of light.
What are the spectral responsivities of a photodiode?
The spectral responsivities of typical photodiodes that are used in the ultraviolet, visible, and near-infrared and calibrated by the SCFs are shown below. **Any commercial equipment, instruments, or materials mentioned are identified to foster understanding.
What are the features of a Si photodiode?
The lineup of Si photodiodes we manufacture utilizing our own advanced semiconductor process technologies covers a broad spectral range from the near infrared to ultraviolet and even to high-energy regions, and features high-speed response, high sensitivity, and low noise.
How is the spectral responsivity of a semiconductor determined?
The elementary physical process determining the spectral responsivity of a semiconductor photodetector is the creation of electron–hole pairs in the photodiode depletion zone. The mean energy required to create an electron–hole pair W is a material property of any semiconductor.
When to use high responsivity in photodetectors?
It should be avoided particularly when a clear quantitative meaning is intended. A photodetector should ideally be operated in a spectral region where its responsivity is not far below the highest possible value, because this leads to the lowest possible detection noise and thus to a high signal-to-noise ratio and high sensitivity.