Copper atoms are shown in blue, iron atoms are shown in green and sulfur atoms are shown in yellow. The dashed lines show the unit cell.
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Lattice parameters for tetragonal cell. One of the advantages of the copper indium chalcogenide compounds is the formation of solid solutions alloys of the formula CuInE2-xE'x, where the composition variable x varies from 0 to 2. As would be expected from a consideration of the relative ionic radii of the chalcogenides the lattice parameters of the CuInS2-xSex alloy should increase with increased selenium content.
Vergard's law requires the lattice constant for a linear solution of two semiconductors to vary linearly with composition e. The large difference in ionic radii between S and Te 0.
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The relative structure of these surfaces are important with respect to oxidation, etching and thin film growth. These processes are orientation-sensitive; that is, they depend on the direction in which the crystal slice is cut. The atom density of a surface may be defined as the number of atoms per unit area. Given the intra-planar inter-atomic distance may be defined as a function of the lattice parameter, the area of this hexagon may be readily calculated. For example in the case of silicon, the hexagon has an area of Since the square is coincident with one of the faces of the unit cell the area of the square may be readily calculated.
For example in the case of silicon, the square has an area of In general, the fewer dangling bonds the more stable a surface structure. An atom inside a crystal of any material will have a coordination number n determined by the structure of the material.
Book Properties Of Semiconductor Alloys Group Iv Iii V And Ii Vi Semiconductors 2009
However, at the surface of a crystal the atoms will not make their full compliment of bonds. Each atom will therefore have less nearest neighbors than an atom within the bulk of the material. The missing bonds are commonly called dangling bonds.
While this description is not particularly accurate it is, however, widely employed and as such will be used herein. As a regulation, Alexander is publication on waking a surface simulation that has experimental and green committees.
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