Patent ID: 6723651
Filing Date: 2004-04-20
Classification: H01L

Abstract:
A plasma-processing method for forming a mirror-like etched surface on an object, said method comprising:providing an apparatus comprising: a process chamber; a mounting unit located in the process chamber and for holding an object having a surface to be etched; and an electrode located in the processing chamber and facing the mounting unit, the electrode having a hole therein, the hole opening towards the mounting unit; mounting an object on the mounting unit; generating a plasma by blowing a plasma-generating from the hole to a surface of the object to be etched and causing a plasma discharge by applying a high frequency voltage between the mounting unit and the electrode, the plasma-generating gas containing a first amount of sulfur hexafluoride and a second amount of helium, the plasma-generating gas containing more helium than sulfur hexafluoride; etching said surface with the generated plasma, thereby forming at least one reaction product; and removing said at least one reaction product from said surface by blowing the plasma generating gas onto said surface simultaneously with etching of said surface until said surface becomes mirror-like.