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Title
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A representation of the energy gap in diamond-structure semiconductors
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Author
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Abstract
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| It is shown that the experimental energy gap E-g , in the four semi-conductors C, Si, Ge and alpha-Sn with the diamond lattice structure is well represented by the relation E-g = A(a(c)(1/2) - a(1/2))(5/3), where a is the lattice parameter and a(c) the 'critical' lattice parameter corresponding to E-g = 0. It is suggested that (a(c)(1/2) - a(1/2)) is an order parameter of the transition from zero to non-zero band gap. It is also shown that the dielectric constant can be related to this order parameter. The band gap relation is also found to hold for the III-V semiconductors once the contribution to the band gap from their electronegativity has been subtracted. |
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Language
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English
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Source (journal)
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Philosophical magazine letters. - London
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Publication
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London
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2004
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ISSN
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0950-0839
[print]
1362-3036
[online]
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Volume/pages
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84
:5
(2004)
, p. 335-340
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ISI
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000222178500006
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Full text (Publisher's DOI)
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