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rgshankar76
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why is that the fermi level should be constant throught the system under equilibrium conditions? can I know the physical outcome of that condition or the violation of the same?
rgshankar76 said:why is that the fermi level should be constant throught the system under equilibrium conditions? can I know the physical outcome of that condition or the violation of the same?
The Fermi level in a semiconductor is the energy level at which there is a 50/50 probability of finding an electron. This level is important because it determines the electrical and optical properties of the semiconductor.
Intrinsic semiconductors have a constant Fermi level with temperature. However, in doped semiconductors, the Fermi level shifts towards the dopant level as temperature increases due to increased thermal energy. This shift can also occur due to changes in the carrier concentration.
The equilibrium conditions for a semiconductor are when the Fermi level is constant throughout the material and there is no net flow of charge. This means that the rates of electron and hole recombination are equal, and the material is in a state of dynamic equilibrium.
Doping is the intentional addition of impurities to a semiconductor to alter its electrical properties. In n-type doping, the Fermi level shifts towards the conduction band due to the introduction of excess electrons. In p-type doping, the Fermi level shifts towards the valence band due to the introduction of excess holes.
The Fermi level is an energy level within the bandgap of a semiconductor, while the bandgap is the energy difference between the valence and conduction bands. The Fermi level determines the carrier concentration and thus the conductivity of the semiconductor, while the bandgap determines its optical properties.