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Diagnostics of particle genesis and growth in RF silane plasmas by ion mass spectrometry and light scattering

Technical Report:

Abstract

Experimental identification of the precursors and processes leading to particles is essential for understanding particulate contamination in deposition plasmas. We have investigated particle formation in rf plasmas using light scattering (elastic and inelastic) and quadrupole ion mass spectrometry as complementary plasma diagnostics. Negative ions reach high masses (at least 500 amu) and are the only elementary species with a residence time on the scale of the powder formation time. Furthermore, a negative ion polymerisation scheme shows that the densities of high mass anions are strongly diminished at kHz power modulation frequencies, where reduced powder production is also observed. We conclude that negative ions are the particle precursors and that initial clusters grow by negative ion polymerisation in silane plasmas. In situ light scattering techniques are described to self-consistently determine particle size, number density and refractive index. Novel, visible photoluminescence measurements from particles suspended in the plasma are also reported. These diagnostics demonstrate that particle evolution proceeds by an agglomeration phase and that the particle properties are different from the bulk material early in the particle development. (author) 9 figs., 45 refs.
Authors:
Hollenstein, C; Dorier, J L; Dutta, J; Howling, A A [1] 
  1. Ecole Polytechnique Federale, Lausanne (Switzerland). Centre de Recherche en Physique des Plasma (CRPP)
Publication Date:
Aug 01, 1993
Product Type:
Technical Report
Report Number:
LRP-482/93; CONF-9308202-
Reference Number:
SCA: 700320; PA: AIX-25:007839; EDB-94:016577; ERA-19:007832; NTS-94:015336; SN: 94001127194
Resource Relation:
Conference: Formation, transport and consequences of particles in plasmas,Chateau de Bonas (France),30 Aug - 3 Sep 1993; Other Information: DN: NATO Advanced Research Workshop.; PBD: Aug 1993
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; MASS SPECTROSCOPY; IONS; MEETINGS; PLASMA; SILANES; PLASMA DIAGNOSTICS; PARTICLE PRODUCTION; VISIBLE RADIATION; ELASTIC SCATTERING; INELASTIC SCATTERING; ANIONS; EXPERIMENTAL DATA; POLYMERIZATION; POWDERS; QUADRUPOLES; RF SYSTEMS; LEADING ABSTRACT; 700320; PLASMA DIAGNOSTIC TECHNIQUES AND INSTRUMENTATION
OSTI ID:
10114077
Research Organizations:
Ecole Polytechnique Federale, Lausanne (Switzerland). Centre de Recherche en Physique des Plasma (CRPP)
Country of Origin:
Switzerland
Language:
English
Other Identifying Numbers:
Other: ON: DE94611448; TRN: CH9300629007839
Availability:
OSTI; NTIS; INIS
Submitting Site:
CHN
Size:
26 p.
Announcement Date:
Jun 30, 2005

Technical Report:

Citation Formats

Hollenstein, C, Dorier, J L, Dutta, J, and Howling, A A. Diagnostics of particle genesis and growth in RF silane plasmas by ion mass spectrometry and light scattering. Switzerland: N. p., 1993. Web.
Hollenstein, C, Dorier, J L, Dutta, J, & Howling, A A. Diagnostics of particle genesis and growth in RF silane plasmas by ion mass spectrometry and light scattering. Switzerland.
Hollenstein, C, Dorier, J L, Dutta, J, and Howling, A A. 1993. "Diagnostics of particle genesis and growth in RF silane plasmas by ion mass spectrometry and light scattering." Switzerland.
@misc{etde_10114077,
title = {Diagnostics of particle genesis and growth in RF silane plasmas by ion mass spectrometry and light scattering}
author = {Hollenstein, C, Dorier, J L, Dutta, J, and Howling, A A}
abstractNote = {Experimental identification of the precursors and processes leading to particles is essential for understanding particulate contamination in deposition plasmas. We have investigated particle formation in rf plasmas using light scattering (elastic and inelastic) and quadrupole ion mass spectrometry as complementary plasma diagnostics. Negative ions reach high masses (at least 500 amu) and are the only elementary species with a residence time on the scale of the powder formation time. Furthermore, a negative ion polymerisation scheme shows that the densities of high mass anions are strongly diminished at kHz power modulation frequencies, where reduced powder production is also observed. We conclude that negative ions are the particle precursors and that initial clusters grow by negative ion polymerisation in silane plasmas. In situ light scattering techniques are described to self-consistently determine particle size, number density and refractive index. Novel, visible photoluminescence measurements from particles suspended in the plasma are also reported. These diagnostics demonstrate that particle evolution proceeds by an agglomeration phase and that the particle properties are different from the bulk material early in the particle development. (author) 9 figs., 45 refs.}
place = {Switzerland}
year = {1993}
month = {Aug}
}