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when a p-n junction is formed electrons from the neutral N type goes to neutral P type. In the junction there will not be any electron or hole. In the junction because of earning electrons, P side becomes negative(ion) , & N side becomes positive(ion). So there will be a potential deference . This is known as the BARRIER......
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Which is greater the breakdown voltage or the barrier potential?
Breakdown voltage is far greater than barrier potential. silicon:- break-down voltage :- 5v - 450 v barrier potential ;- 0.5v to 0.7 V
Can the barrier voltage of a diode act as a voltage source?
No, we don not consider the barrier voltage of a diode to be able to act as a voltage source. The barrier voltage arises during construction of the p-n junction, and it results from charge separation. Separating charges results in voltage, but this difference of potential cannot be tapped as a voltage source because it cannot supply current the way we understand conventional voltage sources are able do.
What is potential barrier in PN junction?
Whenever two dissimilar conductors touch a "potential barrier" forms. All conductive materials have a voltage above zero that an electron must have to enter the material. In true conductors, this voltage is very low. In semiconductors, it can vary, but is usually in the 0.25 to 6.8 Volt range. In insulators, it can be very, very high. When two semiconductors or a metal and a semiconductor touch the difference is polarity sensitive. The higher the "band gap", the voltage that must be overcome to enter the "conduction band", the higher the voltage drop in the forward bias direction. Think of the "band gap", or potential barrier, as being like a curb on a road and sidewalk. It's easy to ride a bike off the sidewalk over the curb onto the road, but not so easy the other way.
How do you barrier voltage is developed?
The integration of the electric field across the depletion region is what develops the barrier voltage.
Why current flow from higher voltage to lower voltage?
Normal flow of electrons are from positive to a less negative potential. When a potential is applied meaning voltage electrons leave their orbit and move to another nucleus leaving at the same time a hole to be fill out by the next electron coming in. In essence electrons flow one way and holes flow in the opposite direction. It is possible to have -100v flowing into a -90v. electrons do not know what the potential can be raised to all they know is the differential potential of 10 v in this caseAnswerIt doesn't. If flows from a higher potential to a lower potential. Voltage means 'potential difference', which is quite different.A 'higher potential' is conventionally taken as meaning 'more positive', while a 'lower potential' is taken as meaning 'less positive'. The direction of conventional current (plus to minus), therefore, is from a higher potential to a lower potential.Electrons, on the other hand, move from negative to positive, so they move from a 'lower potential' to a 'higher potential'.
Why potential across pn junction is called potential barrier?
The potential across a pn junction is called potential barrier because majority charge carriers have to overcome this potential before crossing the junction.
Which is greater the breakdown voltage or the barrier potential?
Breakdown voltage is far greater than barrier potential. silicon:- break-down voltage :- 5v - 450 v barrier potential ;- 0.5v to 0.7 V
Why can't the potential barrier of a diode be used as a voltage source?
The potential barrier of a diode is caused by the movement of electrons to create holes. The electrons and holes create a potential barrier, but as this voltage will not supply current, it cannot be used as a voltage source.
Compare the characteristics of a silicon and germanium diode?
Potential barrier of silicon is 0.7, whereas potential barrier of germanium is 0.3
What is the potential barrier of germanium?
0.3 volt
What happens to the barrier potential when the temperature increases?
barrier potential P0=(kT/q)*ln(Na*Nd/Ni^2) when T ↑, P0↑.
What happen to barrier potential when temperature increases?
barrier potential P0=(kT/q)*ln(Na*Nd/Ni^2) when T ↑, P0↑.
How built-in potential barrier is formed in an open circuited P-N junction?
depletion layer surrounding the junction where electrons from N side have fallen into holes from P side.
Is barrier potential temperature dependent?
Yes, it varies inversely, i.e. as temperature increases the barrier potential decreases. It decreases by 2mV for degree Celsius rise of temperature.
Is a barrier island formed by deposition?
yes
What are forward and reverse bias?
Forward bias is when the height of the depletion layer is reduced such that a greater number of majority charge carriers have sufficient energy to overcome the potential barrier while revers bias is when the height of the potential barrier is increased so that very few majority charge carriers have sufficient energy to surmount the potential barrier. All the above phenomena takes place when a potential barrier is applied across the pn junction.
Was the great barrier reef formed by coral animals?
yes it was, and is, being formed by animals.
