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The word depletion in English refers to the decrease in the quantity of something. Similarly, in semiconductors, the depletion region is the layer where the flow of charges decreases. This region acts as the barrier that opposes the flow of electrons from the n-side to the p-side of the semiconductor diode. Download Complete Chapter Notes of ...
The depletion region’s resistance becomes negligible when the applied voltage is large. In silicon, at the voltage of 0.6 V, the resistance of the depletion region becomes completely negligible, and the current flows across it unimpeded.
A p-n junction diode's depletion area, also known as the depletion layer, is a space devoid of mobile charge carriers. The depletion region is caused by the diffusion of charges. Because of the concentration gradient holes diffuse from p-side to the n-side across the junction while electrons diffuse from the n-side to the p-side.
When a P-N junction is forward biased, the majority carrier of the P and N region will be moving towards the junction, and this will reduce the region of immobile charges and, therefore, the width of the depletion layer is reduced. Under forward bias, the field, because of the space charge region and forward voltage V d will be opposing each ...
When the reverse bias voltage applied to a Zener diode approaches its Zener voltage, the electric field within the depletion region becomes strong enough to attract and remove electrons from their valence band. These valence electrons, energized by the intense electric field, break free from their parent atoms.
The mobile charge carriers such as free electrons are absent in depletion region. The p-side of the depletion region has negative ions and n-side of the depletion region has positive ions. The atom which loses an electron is called positive ion and the atom which gains an extra electron is called negative ion.
This layer is called the depletion layer or the depletion region and the potential difference across the region is called the barrier potential. (ii) Half wave rectifier : When an input ac voltage is applied across the primary coil, a potential difference is developed across the ends of the secondary coil.
This causes an increase in the thickness of the depletion layer. This allows very less current to flow through the PN junction. When the diode is reverse biased the majority of charge carriers are pushed away from the junction and more ions are left at the junction thus causing the widening of the depletion region .
Depletion region. It is a thin layer on both sides of a P-N junction that has immobile ions in the absence of charge carriers. Forward bias. A P-N junction is said to be forward-biased if the negative terminal of the battery is connected to N-side and the positive terminal is connected to the P-side.
The cut-off region is a region in which there will be no conduction and as a result, the MOSFET will be OFF. In this condition, MOSFET behaves like an open switch. Ohmic Region. The ohmic region is a region where the current (I DS)increases with an increase in the value of V DS. When MOSFETs are made to operate in this region, they are used as ...