Embodiments described herein generally relate to methods and apparatus for processing a substrate. More particularly, embodiments described herein relate to heater support kits for bevel etch chambers.
Plasma processing is commonly used for many semiconductor fabrication processes for manufacturing integrated circuits, flat-panel displays, magnetic media, and other devices. A plasma, or ionized gas, is generated inside a remote plasma source (RPS) and flows into a processing chamber and then applied to a workpiece to accomplish a process such as deposition, etching, or implantation. Processing is generally accomplished by introducing a precursor gas or gas mixture into a vacuum chamber that contains a substrate. During the deposition or etching processes, a component, such as a mask or showerhead, may be located opposite the substrate. The precursor gas or gas mixture in the chamber is energized (e.g., excited) into a plasma by using an RPS. The excited gas or gas mixture reacts to selectively etch a layer of film on an edge of the substrate.
However, the beveled edges of the substrate, such as sides and corners thereof, experience conditions that may be different than the conditions experienced at other portions of the substrate. These different conditions affect processing parameters such as film thickness, etch uniformity, and/or film stress. The difference of etch rate and/or film property, such as film thickness or stress, between the center and the edges of the substrate becomes significant and may result in devices with suboptimal characteristics.
Therefore, what is needed in the art is an improved apparatus for bevel etch processing.
Embodiments described herein generally relate to apparatuses for processing a substrate. In one or more embodiments, a heater support kit includes a heater assembly, a chuck ring, a heater arm assembly, and a heater support plate. The heater assembly contains a heater plate having an upper surface and a lower surface. The chuck ring is disposed on at least a portion of the upper surface of the heater plate. The heater arm assembly contains a heater arm and supports the heater assembly. The heater support plate is disposed between the heater plate and the heater arm and in contact with at least a portion of the lower surface of the heater plate. In other embodiments, the heater support kit also includes a lower support plate disposed below the heater support plate and a centering plug disposed below the lower support plate.
In one or more embodiments, a method for bevel etch processing includes placing a substrate on a substrate support inside of a processing chamber, the substrate having a deposition layer, which includes a center, and a bevel edge. A mask is placed over the substrate. The edge ring is disposed around the substrate and on a substrate support. The method also includes flowing a process gas mixture to etch adjacent the bevel edge, and flowing a purge gas through a first hole, a second hole, and a third hole of the mask in the center of the substrate adjacent a top of the substrate.
In other embodiments, a method includes placing a substrate on a substrate support inside of a processing chamber, the substrate having a deposition layer, which includes a center, and a bevel edge. A mask is placed over the substrate. The edge ring is disposed under the substrate and on a substrate support. The method also includes raising the edge ring to contact the mask. The method also includes flowing a process gas mixture adjacent the bevel edge, and flowing a purge gas through a first hole, a second hole, and a third hole of the mask in the center of the substrate adjacent a top of the substrate.
In some embodiments, a method includes placing a substrate on a substrate support inside of a processing chamber, the substrate having a deposition layer, which includes a center, and a bevel edge. A mask is placed over the substrate. The edge ring is disposed around the substrate and on a substrate support. The method also includes flowing a process gas mixture adjacent the bevel edge, and flowing a purge gas through a first hole, a second hole, and a third hole of the mask in the center of the substrate adjacent a top of the substrate. The process gas includes one or more of nitrogen (N2), oxygen (O2), nitrogen trifluoride (NF3), argon, helium, or any combination thereof.
So that the manner in which the above recited features of the present disclosure can be understood in detail, a more particular description of the disclosure, briefly summarized above, may be had by reference to embodiments, some of which are illustrated in the appended drawings. It is to be noted, however, that the appended drawings illustrate only exemplary embodiments and are therefore not to be considered limiting of its scope, may admit to other equally effective embodiments.
To facilitate understanding, identical reference numerals have been used, where possible, to designate identical elements that are common to the Figures. It is contemplated that elements and features of one or more embodiments may be beneficially incorporated in other embodiments.
Embodiments described herein generally relate to methods and apparatus for processing a substrate. More particularly, embodiments described herein relate to methods and an apparatus for bevel etch processing. In some embodiments, a method of cleaning a bevel edge of a semiconductor substrate is provided. The method includes placing a substrate on a cover plate inside of a processing chamber, the substrate having a deposition layer, which includes a center, and a bevel edge. A mask is placed over the substrate. The edge ring is disposed around/under the substrate. The method also includes flowing a process gas mixture adjacent the bevel edge, and flowing a purge gas through a first hole, a second hole, and a third hole of the mask in the center of the substrate adjacent a top of the substrate.
The processing chamber 100 may be used for various plasma processes. In one aspect, the processing chamber 100 may be used to perform dry etching with one or more etching agents. For example, the processing chamber may be used for ignition of plasma from one or more fluorocarbons (e.g., carbon tetrafluoride, hexafluoroethane, and others), nitrogen (N2), oxygen (O2), nitrogen trifluoride (NF3), or combinations thereof. In another embodiment the processing chamber 100 may be used for plasma enhanced chemical vapor deposition with one or more chemical agents.
The processing chamber 100 includes a chamber body 102, a lid assembly 106, a support assembly 104, and a gas outlet 160. The lid assembly 106 is positioned at an upper end of the chamber body 102. The lid assembly 106 and support assembly 104 of
An isolator 110, which may be a dielectric material such as a ceramic or metal oxide, for example aluminum oxide and/or aluminum nitride, contacts the electrode and separates the electrode electrically and thermally from a gas distributor 112 and from the chamber body 102. The gas distributor 112 features openings for admitting process gas into the processing volume 120. The process gases may be supplied to the processing chamber 100 via a conduit 114, and the process gases may enter a gas mixing region 116 prior to flowing through the openings to the substrate 154. The gas distributor 112 may be connected to an RPS.
The support assembly 104 may be any suitable substrate support, such as a vacuum chuck, an electrostatic chuck, or a heated pedestal. In one or more embodiments, the substrate support is an “L” shaped pedestal to save space for load lock installation. The support assembly has a vacuum chuck line, a heating line and a TC that probes support assembly temperature. In some embodiments, the substrate support 104 is configured to support the substrate 154 for processing. The lift mechanism allows the substrate support 104 to be moved vertically within the chamber body 102 between a lower transfer position and a number of raised process positions. The support assembly 104 may be formed from a metallic or ceramic material, for example a metal oxide or nitride or oxide/nitride mixture such as aluminum, aluminum oxide, aluminum nitride, or an aluminum oxide/nitride mixture. A heater 122 may be coupled to the support assembly 104. The heater 122 may be embedded within the support assembly 104 or coupled to a surface of the support assembly 104. The heater 122 may be coupled to a power source extending exterior the chamber 100.
A reactant blocker or mask 150 may be part of the lid assembly 106, or may be a separate detachable piece. The mask 150 has a dome shape body 204 with a flattened bottom surface. As shown in
In operation, a method of etching a substrate begins by placing a substrate on a substrate support inside of a processing chamber. After undergoing a deposition process in the same chamber or in a different chamber, the substrate has a dielectric layer, a center, and a bevel edge. The mask 150 is lowered over the substrate 154 to maintain a small gap between a mask and a substrate between 0.003 inch and 0.100 inch. In one or more embodiments, the substrate 154 and the edge ring 180 are raised to contact the mask 150. In some embodiments, the distance between the substrate 154 and the mask 150 is less than 100 mil. In some embodiments, the distance between the substrate 154 and the mask 150 is about 10 mil. In other embodiments, the distance between the substrate 154 and the mask 150 is less than 100 mil, such as between 5 mil and 20 mil. The edge ring 180 is disposed around/under the substrate 154. In other embodiments, the edge ring 180 is disposed around the cover plate 152. In other embodiments, the edge ring 180 is disposed over the substrate assembly 104. The method continues by flowing a process gas mixture adjacent a top of the substrate 154 and adjacent the bevel edge. The process gas may be any number of etchant gases. The process gas etches the bevel edge. The process gas can include one or more of nitrogen (N2), oxygen (O2), nitrogen trifluoride (NF3), argon, helium, or any combination thereof. The method further includes flowing a purge gas through the three openings 202 of the mask 150 about the center of the substrate 154.
By flowing the etchant gas at a first location and the purge gas at a second location, a more uniform and controlled etch can be achieved. Additionally, the various openings in the mask create a small flow choke and ensure uniform distribution of the purge gas in all directions. Finally, the scalloped cover plate provides stability during substrate placement and pick up.
In one or more embodiments, a heater support kit 501 includes a chuck ring 520, a heater assembly 530, a heater arm assembly 540, a heater support plate 560, a lower support plate 580, and a centering plug 590, as depicted in
The heater support kit 501 includes a lower support plate 580 disposed below the heater support plate 560. The heater support kit 501 includes a centering plug 590 disposed below the lower support plate 580. The centering plug 590 can be coupled or attached to the chamber body 502. The lower support plate 580 contains or includes one or more materials, such as steel, stainless steel, iron, chromium, nickel, aluminum, alloys thereof, or any combination thereof. The heater support kit 501 further includes a pumping plate 510 coupled to the heater arm assembly 540, as shown in
In other embodiments, the heater support kit 501 includes a heater assembly 530 contains a heater plate 532 having an upper surface 531 and a lower surface 533, a chuck ring 520 disposed on at least a portion of the upper surface 531 of the heater plate 532, a heater arm assembly 540 contains a heater arm 542 and supporting the heater assembly 530, and a heater support plate 560 disposed between the heater plate 532 and the heater arm 542 and in contact with at least a portion of the lower surface 533 of the heater plate 532. The heater support kit 501 also includes a lower support plate 580 disposed below the heater support plate 560 and a centering plug 590 disposed below the lower support plate 580.
In one or more embodiments, the heater support kit 801 includes a chuck ring 520, the heater assembly 530, a heater arm assembly 840, the heater support plate 560, and a centering plug 890, as depicted in
In other embodiments, the heater support kit 801 also includes a centering plug 890 disposed below the heater support plate 560. The centering plug 890 can be coupled or attached to the chamber body 802. The heater support kit 801 further includes a pumping plate 810 coupled to the heater arm assembly 840, as shown in
In some embodiments, the heater support kit 801 includes a heater assembly 530 contains a heater plate 532 having an upper surface 531 and a lower surface 533, a chuck ring 520 disposed on at least a portion of the upper surface of the heater plate 532, and a heater arm assembly 540 contains a heater arm 542 and supporting the heater assembly 530. The heater support kit 801 also includes a heater support plate 560 disposed between the heater plate 532 and the heater arm 542 and in contact with at least a portion of the lower surface of the heater plate 532 and a centering plug 890 disposed below the heater support plate 560.
The heater support plate 560 provides physical support on the outer edge of the heater plate 532. The attachment assembly 535 provides axial force downwardly on the heater plate 532 and the heater support plate 560 maintains the heater plate 532 from bowing or deforming under the axial force. The heater support plate 560 contains one or more materials, such as quartz, silica or silicon dioxide, alumina or aluminum oxide, aluminum nitride, aluminum oxynitride, yttria or yttrium oxide, one or more metals, silicates thereof, ceramics thereof, or any combination thereof. Exemplary metals contained in the heater support plate 560 can be or include steel, stainless steel, iron, chromium, nickel, aluminum, alloys thereof, or any combination thereof.
In one or more embodiments, the support structure for the heater is helpful in the bevel etch chamber. When operating the heater at higher temperatures and spacing requirement is stringent (±few mils)—then the heater surfaces can be supported by the heater support plate. The gas purge flow is through the center of the mask and O2/N2 radical flows is at the wafer bevel surface. The operating spacing condition between wafer and mask is at a distance of about 5 mils to about 20 mils but with a spacing tolerance of ±about 1 mil. In some examples, if the spacing is not maintained then there is can be an impact on the bevel etching performance and chamber productivity. The heater support plate helps maintain the desired spacing.
Since the etching happens on the wafer bevel surface, the support structure is more robust at the edge of the heater as shown in the Figures. Therefore the heater support plate is used below the heater edge surface. In some examples, the heater support plate contains materials that can operate at high temperature without deformation, such as quartz, steel or other metal, AlOx, AlN, or combinations thereof. In some configurations, the heater support plate is used to support the heater surface and also can provide a uniform pumping channel below the heater surface. The heater is spring loaded at the center.
The heater support plate provides the robustness of making the bevel etch performance more uniform and does not allow any heater deformation/creep as a function of wafer cycling.
The heater support plate can be in any geometrical design below the heater. It can either be bonded or clamped or just put in placed below the heater surface. The heater support plate can either be uniform on the edge or on either heater structure or only in the center.
While the foregoing is directed to embodiments of the disclosure, other and further embodiments may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow. All documents described herein are incorporated by reference herein, including any priority documents and/or testing procedures to the extent they are not inconsistent with this text. As is apparent from the foregoing general description and the specific embodiments, while forms of the present disclosure have been illustrated and described, various modifications can be made without departing from the spirit and scope of the present disclosure. Accordingly, it is not intended that the present disclosure be limited thereby. Likewise, the term “comprising” is considered synonymous with the term “including” for purposes of United States law. Likewise whenever a composition, an element or a group of elements is preceded with the transitional phrase “comprising”, it is understood that we also contemplate the same composition or group of elements with transitional phrases “consisting essentially of,” “consisting of”, “selected from the group of consisting of,” or “is” preceding the recitation of the composition, element, or elements and vice versa.
Certain embodiments and features have been described using a set of numerical upper limits and a set of numerical lower limits. It should be appreciated that ranges including the combination of any two values, e.g., the combination of any lower value with any upper value, the combination of any two lower values, and/or the combination of any two upper values are contemplated unless otherwise indicated. Certain lower limits, upper limits and ranges appear in one or more claims below.
This application is a continuation-in-part of U.S. application Ser. No. 16/352,518, filed Mar. 13, 2019, which is a continuation of U.S. application Ser. No. 15/654,444, filed Jul. 19, 2017, now issued as U.S. Pat. No. 10,276,364, which claims benefit of U.S. Prov. Appl. No. 62/503,193, filed May 8, 2017, which are herein incorporated by reference in their entireties.
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