^Biasing of a diode
^Biasing of a diode
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^Junction diode
^Junction diode It is formed by joining p-type crystal with a n-type crystal. Majority charge concentration gradient across junction diffuses majority charge carriers diffusion from p to n (called diffusion current) & combine with each other near the junction and get neutralised. Due to electron hole neutralization near the junction the impurity atoms become uncovered […]
^n-type versus p-type
^n – type versus p – type
^Intrinsic versus extrinsic SCs
^Intrinsic versus extrinsic SCs
^Extrinsic or doped semiconductors
^Extrinsic or doped semiconductors By adjusting the amount & distribution of doping the conductivity of a SC can be increased to desired amount. Generally the amount of doping is about ppm (i.e. part per million) i.e. one impurity atom is added in 106 pure atoms (i.e. 1016 impurity atoms in 1023 pure atoms per cc). […]
^Electrical mobility
^Electrical mobility The drift velocity acquired by a charge carrier in a unit electric field is called its electrical mobility and is denoted by μ. i.e. . Mobility of electrons in the VB is less than the mobility of electrons in the CB. Current in a SC is, I = […]
^Rocket propulsion
^Rocket propulsion Multistage rockets used in satellite launching work on NTL’s & conservation of linear momentum. The burnt gases are allowed to escape through a small nozzle with a very high velocity such that the rocket acquires an equal momentum in the opposite direction to conserve momentum. Followig relations (Instantaneous) for used in the vertical […]
^Linear momentum of earth ball system
^Linear momentum of earth ball system When a ball is thrown upwards in vacuum an external force equal to its weight acts on it which changes its linear momentum with the time. However the linear momentum of earth – ball system is conserved & earth moves backward in accordance with LCLM. If we take earth […]
^Explosion of a bomb
^Explosion of a bomb Before explosion, suppose the bomb is at rest i.e., initial total momentum is zero. Now when it explodes, it breaks up into several pieces of masses m1, m2, m3, etc., which fly off in different directions with velocities etc. in such a manner that vector sum of linear momentum of all […]
^Intrinsic SCs
^Intrinsic SCs At 0 K the VB of an intrinsic semiconductor is completely filled with the electrons while the conduction band is completely empty as a result a SC behaves like an insulator at 0 K temperature. However at higher temperatures say at room temperature some of the electrons from the VB gain sufficient thermal […]
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