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Optical Properties of Polytypes of Germanium

  • W. E. Rudge
  • I. B. Ortenburger
Conference paper
Part of the The IBM Research Symposia Series book series (IRSS)

Abstract

The atomic arrangement of the ideal amorphous form of germanium is thought to be a tetrahedrally coordinated random network. Bearing in mind that the diamond structure is only one crystalline example of such a network, it is instructive to compare the density of states and the optical spectrum of amorphous Ge not only with these same quantities calculated for cubic Ge, but also with those for such simple polytypes as the wurtzite-like 2H structure with four atoms per unit cell and the 4H structure with eight atoms per unit cell. All three structures have identical first and second nearest neighbors, but differ at the third nearest neighbors and beyond. We can gain insight into both Brillouin zone and short range order effects by studying these three theoretically possible polytypes, assigning to each the same atomic density and nearest neighbor separation.

Keywords

Main Peak Brillouin Zone Optical Spectrum Random Network Diamond Structure 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Plenum Press, New York 1972

Authors and Affiliations

  • W. E. Rudge
    • 1
  • I. B. Ortenburger
    • 1
  1. 1.IBM San Jose Research LaboratorySan JoseUSA

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