Abstract

Quadruple mass spectrometer and voltage–current (V–I) probe were used to in-situ process diagnostics during deposition of silicon thin films, especially the phase of initial transient status (ITS). The silane concentration variation in plasma region (Cp) was measured in real time, the transient depletion of silane at the beginning of discharge was observed in traditional gas mixing method and pre-hydrogen method. Meantime the electrical parameters were monitored with V–I probe, the fluctuation of discharge voltage and the current over time in the stage of the ITS were given. The relationship between electrical parameters and Cp was analyzed.

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