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there is difference between doping levels.In normal PN junction diode we add 1 impurity for 108 atoms where as in tunnel diode we add 1 impurity for 103 atoms.there is a probability that electrons may penetrate through barrier.So will not disappear in tunnel diode we get maximum current before barrier disappear where as we get maximum current after break down(there is no barrier) this effect lies within a certain voltage limit of 0.4V. When we consider the energy band structure in case of PN junction diode the fermi level lies inside the forbidden energy gap.In case of tunnel diode,the fermi level lies outside the forbidden energy band. In tunnel diode, there is a topic about negative resistance region where as we cannot discuss it in PN junction diode. ur friend, uma.
No. Conduction band is basically the unfilled energy levels into which electrons can be excited to provide conductivity.
The energy leaves as either a photon or phonon.
Conduction band - The unfilled energy levels into which electrons can be excited to provide conductivity.Valence band - The energy levels filled by electrons in their lowest energy states.
No. As temperature increases, resistance of semiconductors decrease. This is because semiconductors have a small energy gap between their valence band and conduction band (in the order of 1 eV). Electrons must exist in the conduction band in order for the material to conduct but electrons exist in the valence band naturally. The electrons gain thermal energy for surroundings and jumps the energy gap from valence band to conduction band and hence, the SC material more readily conducts. As temperature increases, electrons can gain more thermal energy, more electrons can enter the conduction band and hence, resistance decreases.
it is the energy required to transfer an electron from valence band to conduction band, the external energy which is required is equal to the forbidden energy gap
forbidden energy gap or energy gap or band gap or band or Eg is the gap between the top of the valance band and bottom of the conduction band. If we apply the energy equivalent to Eg then the electrons in valance band will jump to the conduction band. Ravinder kumar meena stpi n depletion region is the region in semiconductor where there is depletion of free charge carriers.Ravinder kumar meena stpi n
Because of molecular vibration the heat transferred through a solid is called CONDUCTION
The gap in energy that you are forbidden from visiting. It's a government conspiracy.
conduction.
Conduction :)
Conduction.
thermal energy can transfer through conduction, convention and radiation
there is difference between doping levels.In normal PN junction diode we add 1 impurity for 108 atoms where as in tunnel diode we add 1 impurity for 103 atoms.there is a probability that electrons may penetrate through barrier.So will not disappear in tunnel diode we get maximum current before barrier disappear where as we get maximum current after break down(there is no barrier) this effect lies within a certain voltage limit of 0.4V. When we consider the energy band structure in case of PN junction diode the fermi level lies inside the forbidden energy gap.In case of tunnel diode,the fermi level lies outside the forbidden energy band. In tunnel diode, there is a topic about negative resistance region where as we cannot discuss it in PN junction diode. ur friend, uma.
By heat
Yes
energy