Deposition device and deposition method

A film deposition device, comprising:

• a placement part installed inside a process container, configured to place a substrate thereon, and configured to move up and down between a transfer position at which the substrate is transferred and a process position above the transfer position, the placement part including an annular cover member, which is installed on an outer peripheral portion of the placement part and is configured to cover the outer peripheral portion of the placement part;
• a ceiling part disposed to face the placement part;
• a reaction gas supply part configured to be in communication with a process space defined between the placement part and the ceiling part and configured to supply a reaction gas;
• and
• a controller programmed to maintain the placement part at the process position while the reaction gas is supplied to the process space and the process space is exhausted,
• wherein when the film deposition device is viewed from above, an annular gap exists between a top surface of the annular cover member and an outer peripheral portion of the ceiling part in circumferential directions of the placement part and the ceiling part,
• wherein when the placement part is maintained at the process position, the annular gap has a predetermined height in a range of 0.3 mm to 10.0 mm,
• wherein the reaction gas supplied from the reaction gas supply part into the process space via the ceiling part flows outside of the process space via the annular gap,
• wherein the ceiling part includes:
• a depression formed in a bottom surface of the ceiling part;
• a flat rim formed in the outer peripheral portion of the ceiling part;
• and
• a plurality of gas flow channels, which is used for forming gas-flow walls, is formed in the flat rim,
• wherein the annular cover member is disposed such that a gas discharged from the plurality of gas flow channels is brought into contact with the annular cover member, and
• wherein when the film deposition device is viewed from above, the plurality of gas flow channels formed in the flat rim is arranged to face the top surface of the annular cover member.