Activated gas generation apparatus

1. An activated gas generation apparatus comprising:

a substrate accommodating part for accommodating a substrate to be treated;

an activated gas generating electrode group including first and second electrode constituent parts and spraying an activated gas obtained by utilizing a discharge phenomenon from a source gas from a plurality of gas spray holes discretely formed in said second electrode constituent part, each of said plurality of gas spray holes functioning as a first restricting cylinder formed in a circular opening cross-sectional shape with a first diameter in plan view; and said first diameter being set so that a pressure difference between a primary pressure before passing through said gas spray holes and a secondary pressure after passing is equal to or higher than a predetermined pressure ratio;

a nozzle constituent part including a plurality of nozzle parts provided to correspond to said plurality of gas spray holes of said activated gas generating electrode group one-on-one, each of the nozzle parts causing the activated gas sprayed from each of said plurality of gas spray holes to pass therethrough, to obtain a nozzle passing activated gas; and

a gas jet flow straightener including an inlet part receiving the plurality of nozzle passing activated gases passing through said nozzle constituent part, and injecting the flow-straightened activated gas toward said substrate to be treated, from an outlet part according to a flow-straightening action causing said plurality of nozzle passing activated gases to pass through gas flow-straightening passages, wherein

each of said plurality of nozzle parts includes a second restricting cylinder formed in a circular opening cross-sectional shape with a second diameter in plan view and supplying the activated gas supplied from said first restricting cylinder toward said gas jet flow straightener;

said second diameter is set to be longer than said first diameter, and said nozzle passing activated gases are cylindrical gas jets; and

said gas flow-straightening passage is formed so that an outlet opening area of said outlet part is set to be narrower than an inlet opening area of said inlet part, and cylindrical gas jets of said plurality of nozzle passing activated gases are converted into said linear flow-straightened activated gas along a predetermined direction by said flow-straightening action.

2. The activated gas generation apparatus according to claim 1 ,

wherein said gas flow-straightening passage is provided so that said flow-straightened activated gas is supplied along a direction perpendicular to said substrate to be treated.

3. The activated gas generation apparatus according to claim 1 ,

wherein said gas flow-straightening passage is provided so that said flow-straightened activated gas is supplied along an oblique direction having a predetermined inclination from a direction perpendicular to said substrate to be treated.

4. The activated gas generation apparatus according to claim 1 , wherein

said outlet part of said gas flow-straightening passage has an opening shape with said predetermined direction as a longitudinal direction, and a direction perpendicularly crossing to said longitudinal direction as a short direction; and

said outlet part is formed so that a formation width of said short direction changes along said longitudinal direction.

5. The activated gas generation apparatus according to claim 1 ,

wherein a gas contact region which is a region in contact with a gas in said gas jet flow straightener is formed of quartz or an alumina material as a constituent material.

6. The activated gas generation apparatus according to claim 1 ,

wherein said source gas is a gas containing at least nitrogen, oxygen, fluorine, and hydrogen.

7. The activated gas generation apparatus according to claim 1 , wherein

in said activated gas generating electrode group, said second electrode constituent part is provided below said first electrode constituent part, and by applying an AC voltage to said first and second electrode constituent parts, a discharge space is formed between said first and second electrode constituent parts, and by activating a source gas supplied to said discharge space, an activated gas is generated;

said first electrode constituent part includes a first dielectric electrode and a first metal electrode selectively formed on an upper surface of said first dielectric electrode, said second electrode constituent part includes a second dielectric electrode and a second metal electrode selectively formed on a bottom surface of said second dielectric electrode, and in a dielectric space where said first and second dielectric electrodes face each other by an application of said AC voltage, a region where said first and second metal electrodes overlap each other in plan view is defined as said discharge space;

said second metal electrode includes a pair of second partial metal electrodes formed so as to face each other with a central region of said second dielectric electrode interposed therebetween in plan view, and said pair of second partial metal electrodes have a first direction as an electrode formation direction and a second direction intersecting with said first direction, said pair of second partial metal electrodes facing each other in the second direction, said predetermined direction being said first direction;

said first metal electrode includes a pair of first partial metal electrodes including a region overlapping with said pair of second partial metal electrodes in plan view;

said second dielectric electrode includes

said plurality of gas spray holes formed in said central region and formed along said first direction, and

a central region step part formed so as to protrude upward in said central region; and

said central region step part is formed so as to have a shorter formation width in said second direction as approaching said plurality of gas spray holes in plan view without overlapping with said plurality of gas spray holes in plan view.