Patent ID: 11908728
Assignee: TOKYO ELECTRON LIMITED
Field: Surface technology, coating (Chemistry)
Classification: CPC C  H | IPC C  H

Claim 0:
1. An apparatus for depositing films on a backside of a substrate, the apparatus comprising:
a processing chamber comprising a top wall, a bottom wall and a side wall extending from the top wall to the bottom wall to enclose the processing chamber, the processing chamber having an upper section and a lower section;
a substrate support directly physically coupled to the side wall of the processing chamber and configured to hold a substrate between the upper section and the lower section, the substrate having a front side surface for electrical devices and a backside surface opposite the front side surface, the substrate support having an annular support surface configured to support the substrate along an entire perimeter of the substrate without being in contact with interior regions of the front side surface and without being in contact with interior regions of the backside surface, the substrate support configured to support the substrate with the front side surface facing the upper section and with the backside surface facing the lower section;
a first gas distribution unit positioned in the lower section and facing the backside surface of the substrate when the substrate is being held by the substrate support mechanism, the first gas distribution unit configured to direct deposition gas to the backside surface of the substrate for depositing a film on the backside surface of the substrate; and
a second gas distribution unit configured to flow inert gas into the upper section of the processing chamber sufficient to create a greater gas pressure in the upper section as compared to the lower section;
first and second exhaust ports each provided in the side wall of the processing chamber, wherein the substrate support is physically coupled to the side wall at an area of the side wall between the first and second exhaust ports such that when the substrate is supported by the substrate support, the substrate support and the substrate isolate the upper section from the lower section of the processing chamber, and the first exhaust port is coupled to the upper section of the processing chamber and the second exhaust port is coupled to the lower section;
a controller configured to control flow of the deposition gas from the first gas distribution unit for deposition on the backside surface of the substrate, the controller configured to control flow of the inert gas into the upper section and configured to maintain a gas pressure differential between the upper section and lower section sufficient to prevent passage of the deposition gas from the lower section to the front side surface of the substrate when the substrate is resting on the substrate support.