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

Claim 19:
20. 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 mechanism 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 mechanism including a vertically extending portion 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 mechanism configured to hold the substrate with the front side surface facing the upper section and with the backside surface facing the lower section;
a gas distribution unit positioned in the lower section of the processing chamber and facing the backside surface of the substrate when the substrate is being held by the substrate support mechanism, the 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;
an inert gas distribution unit positioned in the upper section of the processing chamber configured to direct inert gas across the perimeter of the substrate;
a first gas exhaust positioned on an outer portion of the vertically extending portion of the substrate support mechanism and configured to receive the inert gas from the upper section, and a second gas exhaust at an inner portion of the vertical section of the substrate support mechanism configured to receive the deposition gas from the lower section;
wherein the substrate support mechanism is directly physically coupled to the side wall at an area of the side wall between the first and second exhaust such that when the substrate is supported by the substrate support mechanism, the substrate support mechanism and the substrate isolate the upper section from the lower section of the processing chamber; and
a controller configured to control flow of the deposition gas from the gas distribution unit for deposition on the backside surface of the substrate and configured to control flow of the inert gas, the controller configured to cause inert gas pressure to exceed deposition gas pressure such that the deposition gas is prevented from reaching the front side surface.