Spatially averaged (global) model of time modulated high density argon plasmas

Autor:	Michael A. Lieberman, C. Lee, Sumio Ashida
Rok vydání:	1995
Předmět:	Argon Steady state Chemistry Time evolution chemistry.chemical_element Surfaces and Interfaces Plasma Condensed Matter Physics Charged particle Surfaces Coatings and Films Physics::Plasma Physics Duty cycle Physics::Space Physics Electron temperature Continuous wave Atomic physics
Zdroj:	Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films. 13:2498-2507
ISSN:	1520-8559 0734-2101
DOI:	10.1116/1.579494
Popis:	The behavior of argon plasmas driven by time modulated power in ‘‘high density’’ plasma reactors is investigated using a global model. The time evolution of the electron temperature and the plasma density is calculated by solving the particle and energy balance equations. In the first stage of power application during the ‘‘on’’ time, the electron temperature rapidly increases above the steady state value. In this region, charged particles accumulate in the plasma due to the relatively higher power applied than for the continuous wave (cw) case. In the first stage of the ‘‘off’’ time, the electron temperature drops quickly, yielding a smaller particle loss (Bohm) velocity. These effects give rise to higher time‐average plasma densities than for the cw plasma driven by the same average power. The highest average plasma density obtained was more than twice the density of the cw plasma for a duty ratio of 25%. Even higher plasma densities were obtained for shorter duty ratios. The possibility of controlling chemical reactions in the plasma by changing the modulation period is also shown.
Databáze:	OpenAIRE
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