DOI QR코드

DOI QR Code

전극 구조에 관한 2차원 RF 플라즈마의 모델링

Modeling of Two-dimensional Self-consistent RF Plasmas on Discharge Chamber Structures

  • 발행 : 2005.01.01

초록

본 연구에서는 2차원적 유체 모델을 통하여 보다 실질적인 플라즈마를 이해하고자 하였으며, 기하학적인 방전전극 구조를 반영하도록 전극단에서 챔버 외벽의 거리를 변화시키면서 플라즈마의 특성을 정량적으로 비교 분석하고자 하였다. 방전 챔버의 구조로서, 전극의 반경과 방전 챔버의 높이는 일정하게 유지하면서 방전 챔버의 넓이를 변화시킴에 따라 형성되는 플라즈마의 특성을 분석하였다. 그 결과, 전극단과 챔버 외벽의 거리가 짧을수록 그 영역에서 전계가 강하게 형성되어, 외벽을 향하는 각 입자들의 움직임도 매우 활발하다는 것을 알 수 있었다. 또한, 전각단과 외벽과의 거리가 짧을수록 전극 면상에서 형성되는 입자들의 수밀도와 유속의 변화가 일정하게 형성되는 것을 알 수 있었다. 이러한 결과는 웨이퍼의 대구경화에 따른 플라즈마의 균일성을 고려할 경우에 매우 효과적일 것으로 고려되어 진다.

Plasma researches using parallel-plate electrodes are widely used in semiconductor application such as etching and thin film deposition. Therefore, a quantitative understanding and control of plasma behavior are becoming increasingly necessary because their important applications and simulation techniques have been actively carried out in order to solve such problems above. In this paper, we developed a two-dimensional(2D) self-consistent fluid model, because 2D models can deal with real reactor geometries. The fluid model is based on particle continuity equations for taking account of an electrode system in a cylindrical geometry. An pure Ar gas was used at 500[mTorr] and radio-frequency (13.56(MHz)). Four models were simulated under the different electrode geometries which have chamber widths of 5.25, 6.0, 8.0, and 10.0[cm] and we compared their results with each other. Plasma uniformity and a do self-bias voltage were also discussed.

키워드

참고문헌

  1. J. P. Boeuf and L. C. Pitchford, 'Two-dimensional model of a capacitively coupled rf discharge and comparisons with experiments in the Gaseous Electronics Conference reference reactor', Phys. Rew. E, Vol.51 No.2, pp. 1376-1390, 1995
  2. D. Herrebout, A. Bogaerts, M. Yan, R. Gijbels, W. Goedheer and A. Vanhulsel, 'Modeling of a capacitively coupled radio-frequency methane plasma: Comparison between a one-dimensional and a two-dimensional fluid model', J. Appl. Phys., Vol.92, No.5, pp. 2290-2295, 2002 https://doi.org/10.1063/1.1500789
  3. Seiji Samukawa and Tetsu Mieno, 'Pulsed-time modulated plasma discharge for highly selective, highly anisotropic and charge-free etching', Plasma Sources Sci. Technol. Vol 5, pp. 132-138, 1996 https://doi.org/10.1088/0963-0252/5/2/004
  4. 하장호, 전용우, 최상태, 신용철, 박원주, 이광식, 이동인, 도대호, 'A Study on the Characteristics of the Inductive Coupled SF6 Plasma', Proceedings of 1999 KIIEE Annual Conference-International Symposium of Electric Discharge and Plasma, pp. 149-152, 1999
  5. 박원주, 'A Study on the Characteristics of Radio-Frequency Induction Discharge Plasma', Journal of the Korean Institute of the Illuminating and Electrical Installation Engineers, Vol. 13, No. 3, pp. 34-39, 1999
  6. D.P. Lymberopoulos and D.J. Economou, 'Fluid simulations of glow discharge: Effect of metastable atoms in argon', J. Appl. Phys., Vol.73, No.8, pp. 3668-3679, 1993 https://doi.org/10.1063/1.352926
  7. A.A. Kulikovsky, 'A More Accurate Scharfetter Gummel Algorithm of Electron Transport for Semiconductor and Gas Discharge Simulation', J. Com. Phys., Vol.119, pp. 149-155, 1995 https://doi.org/10.1006/jcph.1995.1123
  8. F. F. Young and Chwan-hwa John, 'Two Dimensional, Self Consistent, Three Moments Simulation of RF Glow Discharges', IEEE Trans. Plasma Sci., Vol.21 No.3, pp. 312-320, 1993 https://doi.org/10.1109/27.277557
  9. 임장섭, 소순열, 'Modeling and Analysis of Fine Particle Behavior in Ar Plasma', Journal of the Korean Institute of the Illuminating and Electrical Installation Engineers, Vol. 18, No. 1, pp. 52-59, 2004