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In semiconductors, current flows due to the movement of charge carriers, which are electrons and holes. Electrons are negatively charged particles, while holes represent the absence of an electron and behave as positive charge carriers. When an electric field is applied, electrons can move through the conduction band, while holes move through the valence band, resulting in an overall flow of electric current. This flow is influenced by factors such as temperature, doping levels, and the presence of external electric fields.
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What is saturation in current in diod?
When a pn junction is reversed bias practically no current flows through it ,but a very small current flows through due to minority charge carriers ,which is known as reverse saturation current .In p type due to electrons and in n type due to holes .
What is reverse saturation current in ideal diode?
When a pn junction is reversed bias practically no current flows through it ,but a very small current flows through due to minority charge carriers ,which is known as reverse saturation current .In p type due to electrons and in n type due to holes .
Why current flows in reverse bias in special types of diodes?
due to minority carriers
Why can a semiconductor measure temperature?
Semiconductor resistance depends on temperature. So, you can use a shunt resistor to measure semiconductor voltage with a given current and, then, obtain temperature.
What is a discrete semiconductor?
A discrete semiconductor is an individual circuit that performs a single function affecting the flow of electrical current.
Why is a transistor called a pi-polar device?
a transistor is called a Bi-polar device because in this we use both p-type semiconductor and n-type semiconductor. In p-type semiconductor the current flows with the help of holes(deficiency of an electron or we can say it as a positive charge). while in n-type semiconductor the current flows with the help of electrons(negatively charged particles). so the total current is due to both kind of charge carriers. that's why it is known as a Bi-polar device.
What is whole current in p type semi conductor?
In semiconductor two charge carriers are present i.e holes and electrons.The current is rate of flow of charges.so in ptype semiconductor the current is the sum of current due to holes and electrons.But current due to holes is more compsred to electrons in ptype.
What are the two types of current flow in a semiconductor?
The two types of current flow in a semiconductor are electron current, which is due to the movement of negatively charged electrons, and hole current, which is due to the movement of positively charged "holes" left behind when electrons move through the crystal lattice.
Why no load current is 5 percent of full load current in motor?
As the no load current is the current due to core losses of the motor which is very small .in no load terminals are open circuited no current flows through it, a small current flows which is due to core
What is saturation in current in diod?
When a pn junction is reversed bias practically no current flows through it ,but a very small current flows through due to minority charge carriers ,which is known as reverse saturation current .In p type due to electrons and in n type due to holes .
Why diodes and other electronic devices does not obey ohms law?
Acc to ohm's law-" current flowing in a conductor is directly proportional to the voltage applied across it till its temperature , pressure and other physical parameters are kept constant". This is the major factor ,current remains proportional to applied voltage till temperature is constant and while dealing with semiconductor devices like diodes and transistor , its temperature changes. When current flows within a semiconductor, due to the motion of electrons and collisions in the it, heat is produced and temperature of the semiconductor increases. As semiconductor have negative coefficient of resistance therefore its resistance starts decreasing with the increase in temperature. Hence with the decrease in resistance, its current starts increasing and device shows nonlinear behaviour. that's why ohm's law is not valid for semiconductor. while handling conductors, its temperature also changes as current flows from it but up to a certain range there is not an appreciable change in its resistance and it shows linear behaviour.
What is reverse saturation current in ideal diode?
When a pn junction is reversed bias practically no current flows through it ,but a very small current flows through due to minority charge carriers ,which is known as reverse saturation current .In p type due to electrons and in n type due to holes .
Why does current stop at absolute zero in a semiconductor?
At absolute zero, semiconductor atoms come to a stop due to lack of thermal energy, reducing the number of free charge carriers available for conduction. Without free charge carriers, current cannot flow through the semiconductor, resulting in the cessation of electrical conduction at absolute zero.
What is forward bias current in semiconductor?
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.
Why current flows in reverse bias in special types of diodes?
due to minority carriers
How does a semiconductor diode work?
A semiconductor diode allows current to flow in only one direction due to its asymmetric semiconductor junction. When a forward bias voltage is applied across the diode, it allows current to flow freely. However, when a reverse bias voltage is applied, it blocks current flow due to the depletion layer widening and creating a high resistance barrier.
Carrier of electric current in germanium semiconductor?
electrons or holes depending on doping, as in any semiconductor.
