Dielectric etch chamber with expanded process window
First Claim
1. A capacitively coupled reactor for plasma etch processing of substrates at subatmospheric pressures, comprising:
- (a) a chamber body defining a processing volume;
(b) a lid provided upon said chamber body, said lid comprising a first electrode;
(c) a substrate support provided in said processing volume and comprising a second electrode;
(d) a radio frequency source coupled at least to one of said first and second electrodes for capacitively coupling RF plasma source power into said chamber;
(e) a process gas inlet configured to deliver process gas comprising hexafluoro-1, 3-Butadiene gas into said processing volume;
(f) a process gas outlet; and
, (g) an evacuation pump system including a pump having pumping capacity of at least 1600 liters/second, and a controller connected to said pump, said evacuation pump system being configured to continuously exhaust said processing volume at a rate of at least 48 processing volumes per second whereby to limit a residency in said processing volume of said process gas to less than 70 milliseconds so as to enhance etch selectivity.
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Accused Products
Abstract
A capacitively coupled reactor for plasma etch processing of substrates at subatmospheric pressures includes a chamber body defining a processing volume, a lid provided upon the chamber body, the lid being a first electrode, a substrate support provided in the processing volume and comprising a second electrode, a radio frequency source coupled at least to one of the first and second electrodes, a process gas inlet configured to deliver process gas into the processing volume, and an evacuation pump system having pumping capacity of at least 1600 liters/minute. The greater pumping capacity controls residency time of the process gases so as to regulate the degree of dissociation into more reactive species.
123 Citations
18 Claims
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1. A capacitively coupled reactor for plasma etch processing of substrates at subatmospheric pressures, comprising:
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(a) a chamber body defining a processing volume;
(b) a lid provided upon said chamber body, said lid comprising a first electrode;
(c) a substrate support provided in said processing volume and comprising a second electrode;
(d) a radio frequency source coupled at least to one of said first and second electrodes for capacitively coupling RF plasma source power into said chamber;
(e) a process gas inlet configured to deliver process gas comprising hexafluoro-1, 3-Butadiene gas into said processing volume;
(f) a process gas outlet; and
,(g) an evacuation pump system including a pump having pumping capacity of at least 1600 liters/second, and a controller connected to said pump, said evacuation pump system being configured to continuously exhaust said processing volume at a rate of at least 48 processing volumes per second whereby to limit a residency in said processing volume of said process gas to less than 70 milliseconds so as to enhance etch selectivity. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A plasma reactor, comprising:
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(a) a chamber body defining a processing volume;
(b) a lid provided upon said chamber body, said lid comprising a first electrode;
(c) a substrate support provided in said processing volume and comprising a second electrode, said substrate defining a pumping annulus between said chamber body and said substrate support;
(d) a radio frequency source coupled at least to one of said first and second electrodes for capacitively coupling RF plasma source power into said chamber;
(e) a process gas inlet configured to deliver process gas comprising hexafluoro-1, 3-Butadiene gas into said processing volume;
(f) an evacuation pump system including a pump having pumping capacity of at least 1600 liters/second and coupled said pumping annulus, and a controller connected to said pump, said evacuation pump system being configured to continuously exhaust said processing volume at a rate of at least 48 processing volumes per second whereby to limit a residency in said processing volume of said process gas to less than 70 milliseconds so as to enhance etch selectivity. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A capacitively coupled reactor for plasma etch processing of substrates at subatmospheric pressures, comprising:
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(a) a chamber body defining a processing volume;
(b) a lid provided upon said chamber body, said lid comprising a first electrode;
(c) a substrate support provided in said processing volume and comprising a second electrode;
(d) a radio frequency source coupled at least to one of said first and second electrodes for capacitively coupling RF plasma source power into said chamber;
(e) a process gas inlet configured to deliver process gas comprising hexafluoro-1, 3-Butadiene gas into said processing volume;
(f) a process gas outlet; and
,(g) an evacuation pump system configured to continuously exhaust said processing volume at a pumping rate that is sufficient to limit residency time of said process gas in said processing volume to no greater than 70 ms so as to enhance etch selectivity. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification