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The Formation and Behavior of Particles in Silane Discharges



Alan Gallagher


Particle growth in silane RF discharges and the incorporation of particles into hydrogenated-amorphous-silicon (a-Si: H) devices is described. Measurements of particle density and growth in a silane RF plasma, for particle diameters of 8-50 nm, are described. A decrease in particle density during the growth indicates a major flux of these size particles to the substrate. Particle densites are a very strong function of pressure, film growth rate and electrode gap, increasing orders of magnitude for small increases in each parameter. A full plasma-chemistry model for particle growth from SiHm radicals and ions has been developed, and is outlined. It yields particle densities and growth rates, as a function of plasma parameters which are in qualitative agreement with the data. It also indicates that, in addition to the diameter >2 nm particles that have been observed in films, a very large flux of SixHm molecular radicals with x > 1 also incorporate into the film. It appears that these large radicals yield more than 1% of the film for typical device-depostion conditions, so this may have a serious effect on device properties.
Proceedings Title
Proceedings of the Second International Conference on the Physics of Dusty Plasmas
Conference Dates
May 24-28, 1999
Conference Location
Hotel Kowaki - en Hakone, JA
Conference Title
Frontiers in Dusty Plasmas


particles, silane


Gallagher, A. (1999), The Formation and Behavior of Particles in Silane Discharges, Proceedings of the Second International Conference on the Physics of Dusty Plasmas, Hotel Kowaki - en Hakone, JA (Accessed July 13, 2024)


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Created May 1, 1999, Updated February 17, 2017