Admin What is the main advantage of PIN photodiode?
Advantages of PIN diode : Low bias voltage. Higher reverse voltages to be tolerated. High-speed response. Low junction capacitance.
Which photodiode is more sensitive?
PIN diodes are much faster and more sensitive than p–n junction diodes, and hence are often used for optical communications and in lighting regulation. P–n photodiodes are not used to measure extremely low light intensities.
How is the efficiency of photodiode calculated?
I wish to know the exact formula for the calculation of External Quantum Efficiency (EQE) of UV photodiodes. while in some papers, it is mentioned it as, EQE = 1240 x (R/λ) x 100%.
What are the advantage and disadvantage of photodiode?
Advantages of Photodiode ➨It can be used as variable resistance device. ➨It is highly sensitive to the light. ➨The speed of operation is very high. The switching of current and hence resistance value from high to low or otherwise is very quick.
How is the efficiency of photodiode calculated define its responsivity?
where h ν is the photon energy, η is the quantum efficiency, and e the elementary charge. For example, a silicon photodiode with 90% quantum efficiency at a wavelength of 800 nm, the responsivity would be ≈ 0.58 A/W. Values for other types of photodiode are basically always of that order of magnitude.
What is quantum efficiency of photodiode?
In a photodiode (or some other photodetector), the quantum efficiency can be defined as the fraction of incident (or alternatively, of absorbed) photons which contribute to the external photocurrent. Photomultipliers can have much lower quantum efficiencies, strongly depending on the wavelength region.
How can you increase the efficiency of a photodiode?
For a high responsivity of a photodiode, one should have a material with a strong absorption for the optical wavelength of interest. When using a thicker layer for obtaining efficient absorption, one may lose a lot of the generated carriers and therefore still not substantially improve the responsivity.
What is the difference between PIN and APD photodetectors compare the performance parameters of PIN and APD photodiodes?
They are high-sensitivity, high-speed semiconductor light sensors. The main advantage of the APD is that it has a greater level of sensitivity compared to PIN. The avalanche action increases the gain of the diode many times, providing much higher sensitivity. However, an APD requires a higher operating voltage.