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Table 2 DFT-LDA HOMO-LUMO gap values (in eV) for the crystalline and amorphous silica, and for the embedded Si nanocrystals

From: Silicon and Germanium Nanostructures for Photovoltaic Applications: Ab-Initio Results

  SiO2 Si10/SiO2 Si17/SiO2 Si32SiO2
Crystalline 5.44 1.77 2.36 2.62
Amorphous 5.40 1.41 1.79 1.19