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I think its related to junction of two dissimilar semiconductor (or semiconductor and metal) and not only a semiconductor.
well when two opposite nature semiconductor (hetero or homo) are joined to form a junctions they allow the flow of current in one direction while blocks it in other direction.
The applied bias V which will cause the current flow is called forward bias and the current flowing through the junction forward bias current.
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∙ 12y ago
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Differences between forward bias and reverse bias?
if the positive terminal of a battery is connected to the p side of a semi conductor and the negative terminal to the n side of a semiconductor... then that type of connection is said to be in forward biased .
What is the importance of the reverse-to-forward resistance ratio of a diode?
to determine the comparison of resistance value of both forward and reverse diode . The more the resistance the lower the current , the lower the resistance the higher the current . When reverse bias , the resistance is high and it acts in open circuit and the reverse current is very small that can be neglected . When forward bias , the resistance is low and it acts as short circuit and the forward current is increasing as the voltage supply is higher .
Why diode conducts current in forward bias but does not conduct in reversed bias?
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.
Why do diodes allow current in one way only?
Forward Bias Condition: Diode allows only one way direction, the reason for majority carriers flows to minority carrier. higher to lower that's it. Reverse Bias Condtion: Reverse direction also flows the current, That is Leakage current. it should be minimun for good diode. For Practical Example: See field work.
What is the conclusion of p-n junction?
we can conclude that the standard diode conducts current when connected in forward bias mode.
Forward bias and reverse bias?
forward bias is in the direction a junction or vacuum tube wants to conduct currentreverse bias is in the direction a junction or vacuum tube opposes conducting current
What is the forward voltage so that a semiconductor is heated up in forward bias after the breakover voltage?
When the semiconductor junction is forward biased the primary mode of failure is due to heating because of current. The maximum junction temp is normally 120 deg C. So depending on the way the semiconductor dissipates heat determines the maximum current the device can handle.However when the junction is reverse biased then at a particular voltage depending on the type of semiconductor, size and doping profile at a given voltage the current increases suddenly. If this current is not limited by external circuit then Junction will fuse due to heat.This voltage is fairly constant for a wide range of current and thus provides a sim[ple method of generation a constant voltage.
What is the reason for reverse saturation current?
its simple.reverse saturation current is because of the flow of minority carriers across the junction when the bias is changed suddenly from forward to reverse.this is why it doesnt depend on forward bias
Why is semiconductor used for current instead of normal conductor materials?
The kind of material used in a device depends on its requirements and functions. Semiconductors are used where we need moderate conductivity, conductors are used where we need very high conductivity. Junction diodes(a semiconductor device) allows electricity to pass in one direction and can be used as rectifier. Conductors can't do this. Transistors and LED are other applications of semiconductor. Note that generally devices are made of both conductors and semiconductors.
How does a Shockley diode work?
A Shockley diode uses a metal-semiconductor junction instead of a p-n semiconductor-semiconductor junction. This results in a device with a much lower forward bias voltage drop and much faster switching times.
Why do diode has two resistance values in ieone in forward bias other in reverse bias?
because the current push to the junction.
Differences between forward bias and reverse bias?
if the positive terminal of a battery is connected to the p side of a semi conductor and the negative terminal to the n side of a semiconductor... then that type of connection is said to be in forward biased .
What is the importance of the reverse-to-forward resistance ratio of a diode?
to determine the comparison of resistance value of both forward and reverse diode . The more the resistance the lower the current , the lower the resistance the higher the current . When reverse bias , the resistance is high and it acts in open circuit and the reverse current is very small that can be neglected . When forward bias , the resistance is low and it acts as short circuit and the forward current is increasing as the voltage supply is higher .
When a 10mA forward bias current and the voltages at the anode and cathode of a diode in a circuit are found to be the same what is the diode most likely to be?
With a 10mA forward bias current, if the voltages at the anode and cathode of a diode in a circuit are found to be the same, then the diode most likely to be shorted.
Why the voltage drop across LED is around 2V instead of 0.7V?
the binary semiconductors used to make LEDs have forward bias voltages from 1.5V to 6V depending on color (1.5V for IR-red to 6V for blue-UV) because the bandgap voltage of the semiconductor is higher than silicon. This higher bandgap is where the photons generated get their energy from. germanium has a lower forward bias voltage of 0.2V because the bandgap voltage is lower. metal-semiconductor contacts, like point contact diodes and schottky barrier diodes, can have forward bias voltages under 0.1V
Why diode conducts current in forward bias but does not conduct in reversed bias?
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.
Why does amplifier use only forward bias?
because in forward connection the internal field is in a direction of the main current so the current passes while in the backward connection it is reversed so no current passes
