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It is in a range of 1eV.
(eV=electron volt)
Layne Kunze
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Give some Examples of direct and indirect band gap semiconductors?
direct band gap-semiconductor in which the bottom of the conduction band and the top of the valence band occur at the momentum k=0;in the case of d.b.s. energy released during band-to-band electron recombination with a hole is converted primarily into radiation (radiant recombination); wavelength of emitted radiation is determined by the energy gap of semiconductor; examples of d.b.s. GaAs, InP, ZnS, ZnSs, CdS, CdSe etc. indirect bandgap semiconductor --semiconductor in which bottom of the conduction band does not occur at effective momentum k=0, i.e. is shifted with respect to the top of the valence band which occurs at k=0; energy released during electron recombination with a hole is converted primarily into phonon; e.g. Si, Ge, GaP, GaAsp ,Ge etc, .
What are semiconductor diode laser describe with energy band diagram the construction and working of a semiconductor diode laser?
construction and working of semiconductor laser
Why the semiconductor behave like a insulator as a zero?
O K is absolute zero. At absolute zero, the electrons of the semi conductors are trapped and are immovable from their electron shell as they are in a low energy state. This makes the pure semiconductor an insulator. One must heat the semiconductor to give the electrons enough energy to move to free them from their electron shell, and thus conduct.
Why is silicon not used in fabrication of LED?
Silicon is an indirect band gap semiconductor
What is intrinsic conductor?
Does not exist.An Intrinsic semiconductor is pure substance where the band gap between the full and empty shells isn't very big (only a few eV)
What is the difference between the energy gap of a semiconductor and a superconductor?
Energy gap in a superconductor is not a constant but depends on temperature. Energy gap in a semiconductor is a fixed quantity which does not depend on temperature. The excited quasiparticles or cooper pairs are produced two at a time hence the gap is 2Delta0. In a semiconductor the gap is the energy needed to excite 1 electron into the conduction band. The ground state in a superconductor is made of superconducting cooper pairs , above the gap the electrons are unpaired , the cooper pairs have lower energy. Conduction takes place in the lower ground state in Superconductors , where in semiconductors the electrons conduct from the conduction band. In a superconductor the gap is tied to the fermi level , while in a semiconductor it is fixed to the lattice in reciprocal space.
What is a difference between forbidden energy gap depletion region in semiconductor?
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
Is graphene a semiconductor?
Yes, it is. More specifically it is zero-band-gap semiconductor http://plaza.ufl.edu/tongay/
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 group contains elements that are often used as semiconductors?
For a pure semiconductor:The requirement for a semiconductor is that there is a small energy gap between electrons in their ground state and in an excited "band" of energy levels. A material is considered a semiconductor when the energy gap is approximately equal to the boltzmann constant multiplied by the temperature. (kT)Therefore it is difficult to say a general rule as to what group would give semiconductors as this would take a much more in depth analysis of the energy levels. For example, in group 14, silicon is a well known semiconductor, however Germanium is verging on semi metal, and tin and lead are clearly metals.
Why carbon is not used as semiconductor material?
carbon is not used as the semiconductor because it has larger band gap than silicon and germenium
Give some Examples of direct and indirect band gap semiconductors?
direct band gap-semiconductor in which the bottom of the conduction band and the top of the valence band occur at the momentum k=0;in the case of d.b.s. energy released during band-to-band electron recombination with a hole is converted primarily into radiation (radiant recombination); wavelength of emitted radiation is determined by the energy gap of semiconductor; examples of d.b.s. GaAs, InP, ZnS, ZnSs, CdS, CdSe etc. indirect bandgap semiconductor --semiconductor in which bottom of the conduction band does not occur at effective momentum k=0, i.e. is shifted with respect to the top of the valence band which occurs at k=0; energy released during electron recombination with a hole is converted primarily into phonon; e.g. Si, Ge, GaP, GaAsp ,Ge etc, .
What are the conditions for the fermi level to be exactly in the middle of the energy band gap of a semiconductor material?
For intrinsic semiconductors like silicon and germanium, the Fermi level is essentially halfway between the valence and conduction bands. You don't have to do anything; just keep the semiconductor intrinsic!
What is the narrow-band semiconductor?
Narrow-band semiconductor refers to the semiconductor materials with band gap that is relatively smaller than silicon. This is commonly used as thermo-electric or infrared detectors.
Determining the band gap of semiconductor by Four probe method?
You cannot determine band gap by four probe method.
What are semiconductor diode laser describe with energy band diagram the construction and working of a semiconductor diode laser?
construction and working of semiconductor laser
Why Zinc oxide is a semiconductor?
A substance is classified as a good/bad/semi conductor based upon the energy gap (band gap) in between the valence bands and conduction bands (which are nothing but the collection of molecular orbital energy levels). for ZnO the band gap is ~3.4eV (electron volts). this value is more than for a conductor (like most of the metals Cu, Zn, Ag, Au etc) and less than bad conductors (Wood, Paper etc). so ZnO is a semi conductor. these type of materials can be played with to behave as a good or bad conductor.
