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|Type:||Artigo de periódico|
|Title:||Structural changes induced by nitrogen in the a-Ge : H network|
|Abstract:||The structural modifications induced by the incorporation of nitrogen (2 at.%<C-N<6 at. %, C-N = N concentration) in radio frequency-sputtered hydrogenated amorphous germanium (a-Ge:H) has been studied by infrared spectroscopy. At all N concentrations there is a substantial increase of the density of voids, as indicated by the strength of the absorption band associated with the surface-like stretching vibration of the Ge-H dipole. As C-N increases, the peak position of this mode shifts to smaller values. These effects are also detected through the analysis of the wagging vibration modes of the Ge-H dipole. Comparison of the present results with similar data for H-free a:GeN indicates that the presence of H in the reaction hinders the incorporation of the NGe3 skeletal group, characteristic of beta-Ge3N4. The overall data indicate that almost all N incorporates in N-H and N-H-2 configurations, which are responsible for the formation of a large quantity of small-size voids. (C) 1999 American Institute of Physics. [S0021-8979(99)01106-8].|
|Editor:||Amer Inst Physics|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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