Patent ID: 6887794

Claim:
A pre-cleaning method of a substrate for a semiconductor device, comprising: preparing a chamber, including: a plasma electrode at an outside of the chamber; a power supplying system connected to the plasma electrode; a susceptor in the chamber; and an injector injecting gases into the chamber; equipping a metallic net in the chamber, with the metallic net having a circular shape and a mesh of the metallic net having a size within a range of about 0.1 mm to about 2 mm, the metallic net over the susceptor and grounded disposing a substrate on the susceptor; injecting a hydrogen gas into the chamber through the injector and supplying radio frequency power to the plasma electrode, thereby generating hydrogen ions and hydrogen radicals; and drawing the hydrogen ions to the metallic net and impacting the substrate with hydrogen radicals, thereby removing an oxide layer on the substrate.