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It is the band of energy of an electron in outer most orbit

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12y ago
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12y ago
  • Valence band : Electrons that are in the outermost energy level of an atom or ion.
  • Conduction band: This is the conduction which is partially occupies the electrons.
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Q: What is valence band?
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What is the difference between direct and indirect energy?

The band gap represents the minimum energy difference between the top of the valence band and the bottom of the conduction band, However, the top of the valence band and the bottom of the conduction band are not generally at the same value of the electron momentum. In a direct band gap semiconductor, the top of the valence band and the bottom of the conduction band occur at the same value of momentum.In an indirect band gap semiconductor, the maximum energy of the valence band occurs at a different value of momentum to the minimum in the conduction band energy


What is the working principle of semiconductor laser?

The principle of semiconductor laser is very different from CO2 and Nd:YAG lasers. It is based on "Recombination Radiation" The semiconductor materials have valence band V and conduction band C, the energy level of conduction band is Eg (Eg>0) higher than that of valence band. To make things simple, we start our analysis supposing the temperature to be 0 K. It can be proved that the conclusions we draw under 0 K applies to normal temperatures. Under this assumption for nondegenerate semiconductor, initially the conduction band is completely empty and the valence band is completely filled. Now we excite some electrons from valence band to conduction band, after about 1 ps, electrons in the conduction band drop to the lowest unoccupied levels of this band, we name the upper boundary of the electron energy levels in the conduction band the quasi-Fermi level Efc. Meanwhile holes appear in the valence band and electrons near the top of the valence band drop to the lowest energy levels of the unoccupied valence energy levels, leave on the top of the valence band an empty part. We call the new upper boundary energy level of the valence band quasi-Fermi level Efv. When electrons in the conduction band run into the valence band, they will combine with the holes, in the same time they emit photons. This is the recombination radiation. Our task is to make this recombination radiation to lase


What is the name of two energy bands at which current is produced in silicon?

The two energy bands in which current is produced in silicon are the valence band and the conduction band. Electrons in the valence band can be excited to the conduction band by absorbing energy, allowing them to move and create an electric current.


What parts of an atom does chemistry?

the valence band electrons.


How do currents occur and what is there energy source?

valence band


Why in intrinsic semiconductors do you need to apply very high potential to transfer electrons from the valence band to the conduction band?

Semiconductors, in the absence of applied electric fields, act a lot like insulators. In these materials, the conduction band and the valence band do not overlap. That's why they insulate. And that's why you have to apply some serious voltage to them to shove the valence electrons across the gap between the valence and conduction bands of these semiconductor materials. Remember that in insulators, there is a "band gap" between the lowest Fermi energy level necessary to support conduction and the highest Fermi energy level of the valence electrons. Same with the semi's. In metals, the conduction band overlaps the valence band Fermi energy levels. Zap! Conductivity.


Are free electron in valence band or conduction band?

In semiconductors free electrons are in conduction bands.


Valence electron conductor also can be called?

A valence electron conductor can also be called a semiconductor. Semiconductors have a small but nonzero energy gap between the valence band and the conduction band, allowing them to conduct electricity under certain conditions.


Possibility of holes in conduction band?

hoes are vacancies left by the electron in the valence band. hence there cannot be holes in the conduction band


What are valence band?

The quantum mechanical energy band where electrons reside in semiconductors that participate in interatomic bonding.


Why conduction band and valence band partially filled?

No. Conduction band is basically the unfilled energy levels into which electrons can be excited to provide conductivity.


What is the working principle of Light Emitting Diode and their commercial types?

when electron is excited from valence band to conduction band