Hint: We know that the current that flows in reverse bias PN junction diode is called reverse saturation current. From the diode current equation I=Is(eVηVT−1) the current should decrease as the temperature is increased but the opposite happens.
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What is the formula for reverse saturation current?
Hint: We know that the current that flows in reverse bias PN junction diode is called reverse saturation current. From the diode current equation I=Is(eVηVT−1) the current should decrease as the temperature is increased but the opposite happens.
Why reverse saturation current of silicon is less than germanium?
The reverse current in silicon flows in order of nano amperes compared to germanium in which the reverse current is in order of micro amperes, because of this the accuracy of non-conduction of the Ge diode in reverse bias falls down.
Is reverse saturation current negative?
A very small amount of current (on the order of nA) — called reverse saturation current — is able to flow in reverse through the diode. Breakdown: When the voltage applied across the diode is very large and negative, lots of current will be able to flow in the reverse direction, from cathode to anode.
Which semiconductor material will have the lowest reverse saturation current?
The silicon diode is less sensitive than the germanium diode, hence the operation of silicon diodes is stable with changes in temperature. The Si diode has low reverse current compared to Ge.
How do you calculate reverse saturation density?
To determine the reverse saturation current density at T = 300 K, of an ideal silicon p-n junction with the following parameters: N A = N D = 10 16 cm -3 D p = 10 cm 2 /s D n = 25 cm 2 /s p = n = 0.5 s Assume n i = 1.5×10 10 cm -3 at T = 300 K.
What is reverse saturation current class 12?
The reverse saturation current is the part of the reverse current in a semiconductor diode which is caused by the diffusion of minority carriers from the neutral regions to the depletion region.
Why is Si preferred over Ge?
Why is Silicon preferred over Germanium for semiconductor? The reason is, Silicon can be worked at a higher temperature as compared to germanium. The structure of Germanium crystals will be destroyed at higher temperature. Also, Silicon has much smaller leakage current than that of germanium.
What is reverse saturation current Why is it constant?
in a reverse characteristic of pn junction,current increase in range of nano amp(silicon) or microamp(ger)with respect to reverse voltage . when voltage breakdown occurs,current remains constant and not increase eventhough there is increase of voltage. this current is known as reverse saturation current.
What is reverse saturation current Io?
How is reverse current measured?
The reverse current is measured by measuring the voltage across a high ohmic resistor Rs. The resistor value must suit the current to measure so that the the voltage across can be measured with the 200 mV or 2 V range.
What limits the number of reverse current carriers?
An important conduction limitation of PN junction diode is leakage current. When a diode is reverse biased, the width of the depletion region increases. Generally, this condition is required to restrict the current carrier accumulation near the junction.
What is the order of reverse current in a diode?
The very small current flows through the diode when the diode is in the reverse-biased state is called the reverse current of the diode. The reverse saturation current of a Germanium diode is of the orders of micro-amperes. While the reverse saturation current of a silicon diode is of the order of nano amperes.