Investigations of intrinsic strain and structural ordering in a-Si:H using synchrotron radiation diffraction

Härting, M.; Britton, D.T.; Minani, E.; Ntsoane, T.P.; Topić, M.; Thovhogi, T.; Osiele, OM; Knoesen, D.; Harindintwari, S.; Furlan, F.; Giles, C.

doi:10.1016/j.tsf.2005.07.110

Cited by 2 publications

(1 citation statement)

References 13 publications

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“…In terms of the CRN model, the factors that could be utilised in determining the short-range order in the local structure of tetrahedrally bonded covalent amorphous solids are the fluctuations in the mean first and second nearest neighbour distances (d 1 , d 2 ), and the fluctuations in the mean triplet correlation, or bond angle du. However, although the average inter-atomic separations have been used as good indicators of the quality [30], and macroscopic residual stress [31] of real a-Si:H layers, these parameters do not convey any information about the disorder in the network. The information about the structural disorder is given by the variation in these distances, which is zero for an ordered structure.…”

Section: Domains Of the Stress Landscapementioning

confidence: 99%

Computer simulation of the influence of hydrogen on stress–order correlations in amorphous silicon

Ukpong

2009

Molecular Simulation

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This paper reports the computational simulation of the correlations between atomic-level stress and local structure fluctuations in a computational model of amorphous silicon. A single parameter has been identified, which uniquely characterises the structural order in these structures. This parameter is the linear combination of the SDs of the first and second nearest neighbour separations. The stress fluctuations, under progressive hydrogen incorporation, show two clear dependences on this parameter, and therefore on the structural order. This dual dependency clearly alludes to structural network configurations that contain low and high hydrogen concentrations. The implications of the results on the local geometry of tetrahedrally bonded amorphous solids are discussed.

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Section: Domains Of the Stress Landscapementioning

confidence: 99%