Temperature controlled showerhead
First Claim
Patent Images
1. A chandelier-type showerhead comprising:
- (a) a stem comprising a convective cooling fluid passageway, a gas delivery passageway, a first end, and a second end opposite the first end, wherein;
the ratio of the stem'"'"'s length to the stem'"'"'s width is at least 2;
1,the first end is configured for attachment to a chamber,the convective cooling fluid passageway enters and exits the stem at the first end, andthe gas delivery passageway enters the stem at the first end and exits the stem at the second end;
(b) a back plate thermally coupled to the stem at the second end, wherein;
the stem protrudes from the back plate, andthe first end is offset from the back plate by a distance substantially corresponding to the length of the stem;
(c) a heater physically attached to the back plate;
(d) a face plate thermally coupled to the back plate; and
(e) a temperature sensor for measuring a temperature of the face plate, wherein the temperature sensor is electrically connected to a cable routed from the first end to the second end, and wherein the cable is routed within a sheath between the first end and the second end.
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Accused Products
Abstract
A temperature controlled showerhead for chemical vapor deposition (CVD) chambers enhances heat dissipation to enable accurate temperature control with an electric heater. Heat dissipates by conduction through a showerhead stem and fluid passageway and radiation from a back plate. A temperature control system includes one or more temperature controlled showerheads in a CVD chamber with fluid passageways serially connected to a heat exchanger.
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Citations
27 Claims
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1. A chandelier-type showerhead comprising:
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(a) a stem comprising a convective cooling fluid passageway, a gas delivery passageway, a first end, and a second end opposite the first end, wherein; the ratio of the stem'"'"'s length to the stem'"'"'s width is at least 2;
1,the first end is configured for attachment to a chamber, the convective cooling fluid passageway enters and exits the stem at the first end, and the gas delivery passageway enters the stem at the first end and exits the stem at the second end; (b) a back plate thermally coupled to the stem at the second end, wherein; the stem protrudes from the back plate, and the first end is offset from the back plate by a distance substantially corresponding to the length of the stem; (c) a heater physically attached to the back plate; (d) a face plate thermally coupled to the back plate; and (e) a temperature sensor for measuring a temperature of the face plate, wherein the temperature sensor is electrically connected to a cable routed from the first end to the second end, and wherein the cable is routed within a sheath between the first end and the second end. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 23, 24, 25, 26, 27)
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17. A temperature control system for controlling showerhead temperatures in a CVD chamber, the system comprising:
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(a) a CVD chamber comprising one or more chandelier-type temperature-controlled showerheads, each showerhead comprising; i. a stem comprising a convective cooling fluid passageway, a gas delivery passageway, a first end, and a second end opposite the first end, wherein; the ratio of the stem'"'"'s length to the stem'"'"'s width is at least 2;
1,the first end is configured for attachment to the CVD chamber, the convective cooling fluid passageway enters and exits the stem at the first end, and the gas delivery passageway enters the stem at the first end and exits the stem at the second end, ii. a back plate thermally coupled to the stem at the second end, wherein; the stem protrudes from the back plate, and the first end is offset from the back plate by a distance substantially corresponding to the length of the stem, iii. a heater thermally coupled to the back plate, iv. a face plate thermally coupled to the back plate, and v. a temperature sensor for measuring the temperature of the face plate, wherein the temperature sensor is electrically connected to a cable routed from the first end to the second end, and wherein the cable is routed within a sheath between the first end and the second end; (b) a cooling system fluidly coupled to the convective cooling fluid passageways of the one or more chandelier-type temperature-controlled showerheads comprising; i. inlets and outlets connected with the convective cooling fluid passageways, ii. a liquid-cooled heat exchanger configured to remove heat from a convective cooling fluid that flows serially through the convective cooling fluid passageways of the one more temperature-controlled showerheads and is cooled by the liquid-cooled heat exchanger during transit between each chandelier-type temperature-controlled showerhead; and (c) a controller coupled to each temperature sensor and heater. - View Dependent Claims (18, 19, 20, 21, 22)
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Specification