energy band


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energy band

n
(Atomic Physics) physics a range of energies associated with the quantum states of electrons in a crystalline solid. In a semiconductor or an insulator there is a valence band containing many states, most of which are occupied. Above this is a forbidden band with only a few isolated states caused by impurities. Above this is a conduction band containing many states most of which are empty. In a metal there is a continuous valence-conduction band. See also energy gap
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References in periodicals archive ?
As a result, a remarkable effect has been observed in the energy band gap and electrical conductivity of the polyaniline incorporated paper with variation of Fe[Cl.sub.3] concentration.
Among the experiments themselves are to determine the wavelength of monochromatic light (sodium light) by Newton's ring, to determine the specific rotation of cane sugar solutions using half-shade polarimeter, to verify Stefan's Law by electric method using a vacuum diode, to determine the energy band gap of a given extrinsic semi-conductor material by thermal variation using a four probe method, and to determine the coefficient of viscosity of a water by Meyer's disc method.
Nowadays it's Bill's high energy band The Sharpeez who have established themselves on the touring circuit both here and in Europe.
Many of the other gamma ray emission sources, in this very high energy band, have so far been linked to pulsars or supernova remnants (the remains of an exploding star).
[30] reported similar energy band gaps shifts for Ti[O.sub.2]/Co/Ti[O.sub.2] multilayers with 80 nm Ti[O.sub.2] layers thickness and Co ultrathin interlayers (<4 nm) obtained by RF magnetron sputtering technique.
In this paper, based on the first-principles calculation of density functional theory [10], different proportions of rare earth Ce are doped into the contact material of Sn[O.sub.2], conducting geometric optimization, energy band, density of states and elastic constant, and then analyzing the conductivity and hardness to theoretical study the electronic structure and mechanical properties.
Figure 1 illustrates the energy band diagram of a p-n junction at thermal equilibrium.
To determine the optical energy band gap, the optical absorption coefficient (a) corresponding to the energy (hv) of the irradiation from the absorption spectrum was obtained and the optical energy interval was calculated.
It can be seen from the figures that the values of the energy band gap of the thin films are slightly different.
The scientists were able to vary the thickness of every layer, thereby altering the size and the energy band structure which affects the material's properties - Energy band structure refers to the range of energy that electrons in a particular material could possess.
The energy band gap value of quantum dots is too low and it shows absorption in the Near IR region.
In our work for the first time, all of the three classifications are taken into account with respect to the increasing number of vacancies and energy band gap modifications are clarified.