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Title: Electron and ion kinetics in magnetized capacitively coupled plasma source

Abstract

One-dimensional particle-in-cell Monte Carlo collision simulations of magnetized argon plasmas in an asymmetric capacitively coupled plasma reactor are presented. At low pressure (10 mTorr), electron kinetics are strongly affected by the magnetic field and transitions from nonlocal to local kinetic property occur with increasing magnetic field which are reflected in spatially resolved calculations of the electron-energy probability function. For high-energy electrons, the transition takes place when the energy-relaxation length is smaller than the system length. For low-energy electrons, however, the transition occurs when the electron-diffusion time scale in the energy space is shorter than the spatial-diffusion time scale in coordinate space. These observations are in agreement with experimental data and theoretical calculations deduced from the Boltzmann equation. The ion energy distribution function (IEDF) on the driven electrode changes from the ion-neutral collisional type to the ion-neutral collisionless type with increasing magnetic field strength. The maximum ion energy in the IEDF decreases and the angular spread in the ion angle distribution function slightly increases with increasing magnetic field strength. These changes are explained in terms of the ratio of the ion-transit time to rf frequency, the sheath length, and the mean potential difference between the driven electrode and the plasma. Atmore » high pressure (218 mTorr), electron-neutral collisions disrupt electron gyromotion so that the effects of the magnetic field on electron and ion kinetics are greatly reduced.« less

Authors:
; ; ;  [1]
  1. Department of Electronics and Electrical Engineering, Pohang University of Science and Technology, Pohang 790-784 (Korea, Republic of)
Publication Date:
OSTI Identifier:
20979365
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Vacuum Science and Technology. A, International Journal Devoted to Vacuum, Surfaces, and Films; Journal Volume: 25; Journal Issue: 3; Other Information: DOI: 10.1116/1.2713408; (c) 2007 American Vacuum Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ARGON; BOLTZMANN EQUATION; DISTRIBUTION FUNCTIONS; ELECTRONS; IONS; KINETICS; MAGNETIC FIELDS; MONTE CARLO METHOD; ONE-DIMENSIONAL CALCULATIONS; PLASMA; PLASMA SHEATH; PLASMA SIMULATION; PRESSURE RANGE MEGA PA 10-100

Citation Formats

Lee, S. H., You, S. J., Chang, H. Y., and Lee, J. K.. Electron and ion kinetics in magnetized capacitively coupled plasma source. United States: N. p., 2007. Web. doi:10.1116/1.2713408.
Lee, S. H., You, S. J., Chang, H. Y., & Lee, J. K.. Electron and ion kinetics in magnetized capacitively coupled plasma source. United States. doi:10.1116/1.2713408.
Lee, S. H., You, S. J., Chang, H. Y., and Lee, J. K.. Tue . "Electron and ion kinetics in magnetized capacitively coupled plasma source". United States. doi:10.1116/1.2713408.
@article{osti_20979365,
title = {Electron and ion kinetics in magnetized capacitively coupled plasma source},
author = {Lee, S. H. and You, S. J. and Chang, H. Y. and Lee, J. K.},
abstractNote = {One-dimensional particle-in-cell Monte Carlo collision simulations of magnetized argon plasmas in an asymmetric capacitively coupled plasma reactor are presented. At low pressure (10 mTorr), electron kinetics are strongly affected by the magnetic field and transitions from nonlocal to local kinetic property occur with increasing magnetic field which are reflected in spatially resolved calculations of the electron-energy probability function. For high-energy electrons, the transition takes place when the energy-relaxation length is smaller than the system length. For low-energy electrons, however, the transition occurs when the electron-diffusion time scale in the energy space is shorter than the spatial-diffusion time scale in coordinate space. These observations are in agreement with experimental data and theoretical calculations deduced from the Boltzmann equation. The ion energy distribution function (IEDF) on the driven electrode changes from the ion-neutral collisional type to the ion-neutral collisionless type with increasing magnetic field strength. The maximum ion energy in the IEDF decreases and the angular spread in the ion angle distribution function slightly increases with increasing magnetic field strength. These changes are explained in terms of the ratio of the ion-transit time to rf frequency, the sheath length, and the mean potential difference between the driven electrode and the plasma. At high pressure (218 mTorr), electron-neutral collisions disrupt electron gyromotion so that the effects of the magnetic field on electron and ion kinetics are greatly reduced.},
doi = {10.1116/1.2713408},
journal = {Journal of Vacuum Science and Technology. A, International Journal Devoted to Vacuum, Surfaces, and Films},
number = 3,
volume = 25,
place = {United States},
year = {Tue May 15 00:00:00 EDT 2007},
month = {Tue May 15 00:00:00 EDT 2007}
}