Heating power at the substrate, electron temperature, and electron density in 2.45 GHz low-pressure microwave plasma

Abderrahmane Kais (1) , Juslan Lo (1) , Laurent P. Thérèse (1) , Philippe Guillot (1)

1 DPHE - Diagnostic des Plasmas Hors Equilibres

To control the temperature during a plasma treatment, an understanding of the link between the plasma parameters and the fundamental process responsible for the heating is required. In this work, the power supplied by the plasma onto the surface of a glass substrate is measured using the calorimetric method. It has been shown that the powers deposited by ions and electrons, and their recombination at the surface are the main contributions to the heating power. Each contribution is estimated according to the theory commonly used in the literature. Using the corona balance, the Modified Boltzmann Plot (MBP) is employed to determine the electron temperature. A correlation between the power deposited by the plasma and the results of the MBP has been established. This correlation has been used to estimate the electron number density independent of the Langmuir probe in considered conditions.

Domaines: Physique des plasmas [physics.plasm-ph]; Plasmas

Abderrahmane Kais, Juslan Lo, Laurent P. Thérèse, Philippe Guillot. Heating power at the substrate, electron temperature, and electron density in 2.45 GHz low-pressure microwave plasma. Physics of Plasmas, 2018, 25 (1), pp.013504. ⟨10.1063/1.5005592⟩. ⟨hal-02537448⟩