hanii said:so if we operate it in forward bias...the depletion layer length would be less compared to that as in reverse biased condition...there by reducing its sensitivity . why only the depletion layer is exposed to light... not all the device..?
hanii said:so biasing only helps to improve the reverse current ...?? if it is so...can we get the reverse current flow through the load and produce potential difference across it without biasing the diode...??
A photodiode is operated in reverse bias because it allows for a larger depletion region, which increases the sensitivity of the photodiode to light. Additionally, reverse biasing reduces the dark current, which improves the signal-to-noise ratio of the photodiode.
Reverse biasing increases the sensitivity of a photodiode by creating a larger depletion region, which allows for a larger area for light to be absorbed. This results in a larger photocurrent, making the photodiode more sensitive to light.
The dark current in a photodiode is the current that flows through the diode when no light is present. Reverse biasing reduces the dark current by pushing the majority carriers away from the junction, making it more difficult for them to recombine and create a current.
No, a photodiode can also be operated in forward bias. However, reverse biasing is the preferred method for applications where high sensitivity and low dark current are important.
If a photodiode is operated in forward bias, it will act as a normal diode and allow current to flow in the forward direction. This can be useful for certain applications, but it will not provide the same level of sensitivity and low dark current as operating in reverse bias.