ELECTROSTATIC CHUCK AND BASE FOR PLASMA REACTOR HAVING IMPROVED WAFER ETCH RATE
First Claim
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1. A plasma reactor comprising:
- an enclosure;
a plasma gas source to supply a plasma gas in the enclosure;
a cathode pedestal coupled to the enclosure;
a metallic base supported by the cathode pedestal;
a support coupled to the metallic base;
an electrostatic chuck coupled to the support and having an electrode therein,wherein the support and the electrostatic chuck each comprises a dielectric material having a high resistivity, high thermal conductivity and low radiofrequency (RF) energy loss;
an RF source coupled to the metallic base to excite the plasma gas in the enclosure; and
a DC voltage source coupled to the electrode to secure a wafer to the electrostatic chuck.
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Abstract
An electrostatic chuck device in which the electrostatic chuck and support are made from high resistivity, high thermal conductivity and low RF energy loss dielectric materials is described. An advantage of this electrostatic chuck device is that the wafer surface electromagnetic field distribution is more uniform than conventional electrostatic chuck devices. As a result, the wafer etch rate, especially the wafer edge etch rate non-uniformity, is significantly improved compared with conventional electrostatic chuck devices.
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Citations
22 Claims
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1. A plasma reactor comprising:
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an enclosure; a plasma gas source to supply a plasma gas in the enclosure; a cathode pedestal coupled to the enclosure; a metallic base supported by the cathode pedestal; a support coupled to the metallic base; an electrostatic chuck coupled to the support and having an electrode therein, wherein the support and the electrostatic chuck each comprises a dielectric material having a high resistivity, high thermal conductivity and low radiofrequency (RF) energy loss; an RF source coupled to the metallic base to excite the plasma gas in the enclosure; and a DC voltage source coupled to the electrode to secure a wafer to the electrostatic chuck. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An electrostatic chuck device for a plasma reactor comprising:
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a metallic base; a support coupled to the metallic base; an electrostatic chuck coupled to the support and having an electrode therein, wherein the support and the electrostatic chuck each comprises a dielectric material having a high resistivity, high thermal conductivity and low radiofrequency (RF) energy loss. - View Dependent Claims (11, 12, 13, 14, 15)
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16. An electrostatic chuck device for a plasma reactor comprising:
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a metallic base; a support coupled to the metallic base, wherein the support comprises SiC or AlN; an electrostatic chuck coupled to the support, wherein the electrostatic chuck comprises Al2O3; and an electrode in the electrostatic chuck. - View Dependent Claims (17, 18, 19, 20)
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21. A method of fabricating an electrostatic chuck comprising:
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coupling a support to a metallic base, wherein the support comprises dielectric material; coupling an electrostatic chuck to the support, wherein the electrostatic chuck comprises dielectric material, wherein the dielectric material of the support and the dielectric material of the electrostatic chuck are selected from the group consisting of SiC, ALN and Al2O3; and sintering an electrode in the electrostatic chuck. - View Dependent Claims (22)
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Specification