Patent ID: 7138336

Claim:
A plasma enhanced atomic layer deposition (PEALD) apparatus for depositing a thin film on a substrate, the apparatus comprising: a substrate carrier for supporting a substrate; a reactor wall defining the interior of a reactor together with said substrate carrier and said reactor wall having an opening at the top thereof; a gas inlet tube for supplying a gas into said reactor; a showerhead assembly to which said gas inlet tube is connected and installed within said reactor wall and defining a reaction space together with said substrate carrier and said showerhead assembly for supplying a gas to said reaction space; a micro-feeding tube assembly made of insulating materials mounted between said gas inlet tube and the showerhead assembly for preventing generation of plasma due to potential difference between said gas inlet tube and the showerhead assembly while maintaining flow of gas supplied through said gas inlet tube, the micro feeding tube having a plurality of small tubes mounted in parallel, the plurality of small tubes configured to suppress plasma generation therein; a gas outlet tube for discharging a gas from the reaction space; and a radio frequency (RF) connection terminal for generating plasma.