Exhaust flow spreading baffle-riser to optimize remote plasma window clean
First Claim
1. An exhaust baffle for a process chamber for a semiconductor process, the process chamber having a) a gas inlet region configured to flow process gases into the process chamber, across a window of the chamber, and between the window and a pedestal within the process chamber and b) a gas exhaust region configured to evacuate the gas flowed into the process chamber via the gas inlet region from the process chamber, the exhaust baffle comprising:
- a base surface inscribed in a triangular region, the base surface having a first side edge, a second side edge, and an inlet edge;
an exhaust aperture in the base surface and located opposite the inlet edge;
a raised profile section located along the inlet edge, the raised profile section having an upper surface offset from the base surface by a first distance, wherein the exhaust baffle is configured to interface with at least one other component in the gas exhaust region of the process chamber such that the base surface is offset from the at least one other component in the gas exhaust region of the process chamber by a second distance and such that the first distance is at least 50% of the second distance.
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Accused Products
Abstract
Porogen accumulation in a UV-cure chamber may be reduced by removing outgassed porogen by flowing a purge gas across a window through which a wafer is exposed to UV light. Porogens in the purge gas stream may, as they flow through the chamber and into an exhaust baffle, deposit on surfaces within the chamber, including on the exhaust baffle. The exhaust baffle may have particular features that cause such porogen deposition to be more uniformly distributed across the exhaust baffle, thus reducing the amount of time that may be required to fully clean the baffle of accumulated porogens during a cleaning process.
80 Citations
20 Claims
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1. An exhaust baffle for a process chamber for a semiconductor process, the process chamber having a) a gas inlet region configured to flow process gases into the process chamber, across a window of the chamber, and between the window and a pedestal within the process chamber and b) a gas exhaust region configured to evacuate the gas flowed into the process chamber via the gas inlet region from the process chamber, the exhaust baffle comprising:
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a base surface inscribed in a triangular region, the base surface having a first side edge, a second side edge, and an inlet edge; an exhaust aperture in the base surface and located opposite the inlet edge; a raised profile section located along the inlet edge, the raised profile section having an upper surface offset from the base surface by a first distance, wherein the exhaust baffle is configured to interface with at least one other component in the gas exhaust region of the process chamber such that the base surface is offset from the at least one other component in the gas exhaust region of the process chamber by a second distance and such that the first distance is at least 50% of the second distance. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A UV semiconductor processing tool comprising:
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a process chamber; a pedestal located within the process chamber; an ultraviolet (UV) light source positioned so as to expose the pedestal to UV radiation from the UV light source; a window positioned between the UV light source and the pedestal; a gas inlet region configured to flow process gases into the process chamber, across the window, and between the window and the pedestal; and a gas exhaust region having an exhaust baffle, the gas exhaust region configured to evacuate the gas flowed into the process chamber via the gas inlet region from the process chamber, wherein the baffle has; a base surface inscribed in a triangular region, the base surface having a first side edge, a second side edge, and an inlet edge; an exhaust aperture in the base surface and located opposite the inlet edge; a raised profile section located along the inlet edge, the raised profile section having an upper surface offset from the base surface by a first distance, wherein the exhaust baffle is configured to interface with at least one other component of the process chamber such that the base surface is offset from the at least one other component by a second distance and such that the first distance is at least 50% of the second distance. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification