Impact of charged species transport coefficients on self-bias voltage in an electrically asymmetric RF discharge

Jean-Maxime Orlac'H (1) , Tatiana Novikova (1) , Vincent Giovangigli (2) , Erik Johnson (1) , Pere Roca (1)

1 LPICM - Laboratoire de physique des interfaces et des couches minces [Palaiseau]
2 CMAP - Centre de Mathématiques Appliquées - Ecole Polytechnique

In this paper, we use a fluid model to simulate the excitation of a hydrogen radio-frequency discharge, and employ tailored voltage waveforms to assess the effect of charged species transport properties. Results of the fluid simulation are compared with experimental data and previous results obtained with a hybrid model. Several expressions for electron and ion transport coefficients are compared, and their impact on the self-bias potential is studied. The self-bias is shown to be insensitive to the choice of electron transport coefficients, while remarkably sensitive to variations in ion mobility. Besides, our results show that fluid models can be competitive with hybrid models, provided self-consistent ion transport models and rate constants are used.

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

Jean-Maxime Orlac'H, Tatiana Novikova, Vincent Giovangigli, Erik Johnson, Pere Roca. Impact of charged species transport coefficients on self-bias voltage in an electrically asymmetric RF discharge. Plasma Sources Science and Technology, 2019, 28 (5), pp.055003. ⟨10.1088/1361-6595/ab067d⟩. ⟨hal-01856184v3⟩