the current which has negative value n passes through the diode is called as diode reverse current
Diodes will have a small leakage current in reverse bias. In most cases, this current can be considered insignificant and ignored.
The reverse-biased leakage of a diode is due to to two things. One, a physical property of the diode known as free-carrier recombination. The electrons and positrons which exist near the p-n boundary are constantly re-combining. This creates a fixed current known as the saturation current. If the diode is reverse biased, then the saturation current flows in the external circuit. Two, contamination in the diode causes a current which is like a resistor connected in parallel with the diode. A good rule of thumb is that the total reverse-biased diode leakage current (One + Two) will double every 10 degrees C. For the very best diodes, with tiny leakages, search for the forum comments of Dr. Winfield Hill on the topic of very clean diodes with ultra-low leakage.
A diode when forward biased will allow the flow of current while reverse biasing will cut off the flow of current. It is the basic building block of any semiconductor.
When the diode is reverse biased a depletion zone is formed at the junction between the cathode and anode, that lacks current carriers (it has neither electrons or holes). Without current carriers, the diode acts as an open circuit, blocking current flow.
A rectifier diode normally allows current to pass in one direction (the forward direction), and almost no current in the opposite direction (the "reverse" direction). The diode is designed to work up to a certain voltage; if more than a certain voltage is applied in the reverse direction, it will "break down", and suddenly a large current will flow. This can irreparably damage the rectifier diode, unless it is of a type specifically designed to operate in the breakdown region - i.e., a Zener diode.
When a diode is operated as reverse bias the current flow is almost completely blocked. A small amount of current is still able to travel in reverse through the diode and this is referred to as the reverse current saturation.
The leakage current of a (zener) diode is the current that leaks when a diode is connected in reverse biased.
The leakage current of a (zener) diode is the current that leaks when a diode is connected in reverse biased.
Reverse saturation current of germanium diodeThe current that exists under reverse bias conditions is called the reverse saturation current. Reverse saturation current of the germanium diode is typically 1 micro ampere or 10-6 a.At a fixed temperature, the reverse saturation current of a diode increases with increase in applied reverse bias. In reverse bias region the reverse saturation current also varies with the temperature.
diode current flows only when the diode is forward biased because in reverse bias the barrier potential increases. Diode can conduct in reverse bias if applied votage is high enough to overcome the reverse bias barrier potential but it can be destructive.
doping concentration,temperature are the major source of reverse current
There are two diode ratings. One is the forward current rating, and the other is the reverse breakdown voltage rating. The forward current rating is the maximum current that the diode can conduct before failing, and the reverse breakdown voltage rating is the maximum reverse voltage that can be applied before failing. Of course, the reverse voltage rating has a different meaning in a zener diode, but this answer applies to ordinary diodes.
because semiconductor diodes are not perfect insulators when reverse biased. if you want a diode that is a perfect insulator when reverse biased, use a vacuum tube diode.
A: They are both diodes. The difference lies in the application. A rectifier is used to rectify AC current into pulsating current. The zener diode is used to regulate a voltage source to the zener voltage when connected in the reverse direction. ************************************************************** If you look at the characteristic curves of a rectifier diode and a zener diode, you will see that they are similar, but the reverse curve of the zener has a much sharper bend at what is called the "knee". It is at this point on the zener's curve at which it operates.
Diodes will have a small leakage current in reverse bias. In most cases, this current can be considered insignificant and ignored.
A diode is an electronic component with the characteristic that its resistance is not constant, but depends on the magnitude of the current through it. An ideal diode has zero resistance to current in one direction, and infinite resistance to current in the reverse direction.
A zener diode, in the reverse bias condition, presents a higher voltage. The current, however, is a function of the supplying circuit.