This application claims priority to U.S. patent application Ser. No. 13/283,408 entitled “HEATER JACKET FOR A FLUID LINE” to Yednak III et al., filed on Oct. 27, 2011, the disclosure of which is hereby incorporated herein by reference in its entirety.
This disclosure relates generally to semiconductor processing, and more particularly to a valve assembly having an improved temperature control system for semiconductor processing fluid lines.
Semiconductor fabrication processes are typically conducted with the substrates supported within a chamber under controlled conditions. For many purposes, semiconductor substrates (e.g., wafers) are heated inside the process chamber. For example, substrates can be heated by direct physical contact with an internally heated wafer holder or “chuck.” “Susceptors” are wafer supports used in radiantly heated systems where the wafer and susceptors absorb radiant heat.
Some of the important controlled conditions include, but are not limited to, fluid flow rate into the chamber, temperature of the reaction chamber, temperature of the fluid flowing into the reaction chamber, and temperature of the fluid throughout the fluid line.
In order to obtain a consistent reaction environment, maintaining the correct flow rate of precursor at a correct temperature is among the key factors. However, the importance of maintaining the temperature of the precursors at a uniform temperature is not limited to just the reaction chamber. A number of precursors have a limited temperature range of gaseous phase composition. Thus, in order to maintain the correct flow rate, the precursor must be maintained within a slim temperature range from the source container, through the fluid line, and finally into the reaction chamber.
A number of heater jackets have been developed in an attempt to maintain consistent fluid temperatures during the transition from the temperature controlled source container to the reaction chamber. One common example is cloth heater jackets which surround the fluid line and include a cloth inner layer in contact with the fluid line. The cloth heater jacket may be generally flexible but wear easily. An alternative to heater jackets includes heat tape, which is inexpensive but time consuming to install on fluid lines. Further, when a section of the fluid line needs to be worked on or replaced, the heat tape must be removed, scraped, and a new section installed in its place.
Precursor valve assemblies also present a number of heating challenges due to their compact nature and exposed fluid line connections between each of the valve members or bodies.
Various aspects and implementations are disclosed herein that relate to valve assembly designs and methods of heating a fluid line in a valve assembly. In one aspect, a valve assembly comprises a mounting block having a first surface, a plurality of valves connected to the mounting block first surface, at least one fluid line connecting the plurality of valves spaced apart from the mounting block first surface, a heating element spaced apart from the at least one fluid line and located within a first insulating layer, and wherein the first insulating layer extends less than completely around the at least one fluid line.
In an implementation, the heating element may be positioned adjacent the at least one fluid line. The valve assembly may further include a second insulating layer spaced apart from the heating element and between the at least one fluid line and the mounting block first surface. The first insulating layer and the second insulating layer may together surround the at least one fluid line. The heating element may radiantly heat the at least one fluid line. The first insulating layer may further include a recessed portion positioned at each of the at least one fluid lines.
The valve assembly may further include a second heating element separate from the heating element. The heating element may be encapsulated within a recessed portion of the first insulating layer. The recessed portion may be encapsulated with a silicone rubber. The first insulating layer may be positioned between the plurality of valves. The valve assembly may further include a secondary insulator positioned on the first insulating layer. The secondary insulator may include three separable layers. The secondary insulator may further include a plurality of apertures adapted to receive the plurality of valves. The first insulating layer may be composed of a high density foam. The first insulating layer may further include a first upper insulating layer and a second insulating layer. The first upper insulating layer may further include a first heating element and the second upper insulating layer may further include a second heating element. The first heating element and the second heating element may be configured to be separately controlled. The heating element may radiantly heat the at least one fluid line only within the recessed portion.
In another aspect, a method of heating a fluid line in a valve assembly comprises the steps of providing a first insulating layer having a heating element spaced apart and surrounding less than all of the at least one fluid line, surrounding the at least one fluid line between the first insulating layer and the valve block, and powering the heating element to radiantly heat an area between the first insulating layer and the valve block and the at least one fluid line.
In yet another aspect, a valve assembly includes a mounting block having a mounting surface, a plurality of valves connected to the mounting block mounting surface, at least one fluid line in fluid communication with the plurality of valves above the mounting block mounting surface, a heating element positioned above the at least one fluid line and located within an upper insulating layer, and wherein the upper insulating layer extends less than completely around the at least one fluid line.
This Summary is provided to introduce a selection of concepts in a simplified form that are further described below in the Detailed Description. This Summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used to limit the scope of the claimed subject matter. Furthermore, the claimed subject matter is not limited to implementations that solve any or all disadvantages noted in any part of this disclosure.
The present aspects and implementations may be described in terms of functional block components and various processing steps. Such functional blocks may be realized by any number of hardware or software components configured to perform the specified functions and achieve the various results. For example, the present aspects may employ various sensors, detectors, flow control devices, heaters, and the like, which may carry out a variety of functions. In addition, the present aspects and implementations may be practiced in conjunction with any number of processing methods, and the apparatus and systems described may employ any number of processing methods, and the apparatus and systems described are merely examples of applications of the invention.
Isolation unit 14 may include a rigid outer surface 26 composed of aluminum, stainless steel, or any other suitable material and an isolation sheet 28 composed of a high density foam or other suitable material. Isolation unit 14 is used to not only protect the valve assembly from damage due to shock or vibration, but also acts to thermally isolate the valve assembly and the remainder of the tool
As discussed above, mounting block 12 serves as a base unit for supporting the valve assembly while also providing heat to the valves. Valves 18 are oriented at a right angle with respect to first surface 16 (or top surface in
Valve assembly 10 may also include a manual adjustment valve 38 having an adjustment knob 40 which can be used as a needle valve to regulate flow throughout the valve assembly.
Valve assembly 10 may also include a pair of thermocouples 42 to measure the outer surface temperature of at least two valves. Thermocouples 42 are connected to the respective valves with clamps 44 secured around valves 18 with bolts 46. The thermocouples 42 are connected to clamps 44 through thermocouple mounts 48 and the clamps may include through holes (not shown) which permit the thermocouple probes to be positioned directly adjacent or in contact with the valve 18 outer surfaces for more accurate temperature readings and temperature control.
Referring still to
A carrier or purge line inlet 52 is positioned upstream from a carrier or purge line outlet 54 and a precursor or processing fluid inlet 56. Further, a process vacuum inlet 58 may be located on the valve assembly. Carrier line inlet 52 is in fluid communication with the precursor fluid inlets and permits the appropriate mixing of the carrier fluid and the precursor fluids. In one non-limiting example, the carrier fluid may be a nitrogen gas or an argon gas. After proper mixing within the valve assembly, the fluid exits valve assembly 10 at reactor outlet 60 and is directed to the reaction chamber for a deposition or etch process, as appropriate.
As can be further seen in
First secondary layer 80 includes a plurality of apertures 90 strategically placed along a horizontal surface of the layer and extending throughout the full thickness of the first secondary layer. Similarly, second secondary layer 82 includes a plurality of apertures 92 extending throughout the thickness of the second secondary layer and the third secondary layer 84 includes a plurality of apertures 94 extending throughout the thickness of the third secondary layer. Advantageously, all three layers of the insulator assembly 66 are aligned with one another and with respect to deposition valves 18. The three secondary insulation layers 80, 82, and 84 are each aligned to permit the apertures to surround the lower chamber 22 of each deposition valve 18. Accordingly, this arrangement reduces heat loss to the surrounding environment.
Secondary insulation layers 80, 82, and 84 are each approximately ½″ thick sponge or high density material, such as silicone foam. While the particular material and dimensions utilized are provided purely for this exemplary non-limiting embodiment, one of ordinary skill in the art will immediately realize that any suitable material and dimensions may be utilized without departing from the spirit and scope of the disclosure.
Referring now to
Still further, second insulating layer 96 is preferably dimensioned to fit below fluid lines 34 during operation. In many embodiments, second insulating layer 96 may be installed on mounting block 12 prior to cradles 32 and deposition valves 18. Nevertheless, the second insulating layer 96 may be installed after the cradles 32 and deposition valves 18 in other embodiments. Regardless of when installed, second insulating layer 96 is preferably positioned just below fluid lines 34 when fully installed so as to provide a small air gap between fluid lines 34 and the second insulating layer 96.
Referring now to
Further, the recessed portions 76 are oriented in both an X and Y plane as, in this particular non-limiting example; there are a plurality of fluid lines 34 which are exposed as they traverse both directions. Each labeled recessed portion 76 provides heating to a fluid line 34 which includes at least a portion that is not located within a cradle 32 or below a deposition valve 18. For the sake of clarity, each recessed portion provides direct radiant heat to a fluid line which would otherwise not be directly heated without the respective heating unit and heating element 74. Accordingly, while the particular orientation and arrangement of the recessed portions is applicable to this non-limiting example, any number and orientation of recessed portions may be utilized to provide radiant or convection heating to the exposed fluid lines. Further, the shape and positioning of each heating until 68, 70 may be modified or adapted based on the deposition valve orientation and positioning. For example, three or four different heating units may be utilized and may each include their own heating elements 74 disposed therein for heating the respective fluid lines 34. Further, a single heating unit may be utilized and include only a single heating element 74 or a plurality of heating elements disposed throughout the heating unit.
In one non-limiting example, recessed portions 76 of heating unit 68 and 70 are generally deep enough to create three sides (top side and two sidewalls) around each fluid line and extends less than completely around fluid lines 34. Further, because the heating units 68, 70 are resting adjacent and/or on second insulating layer 96, the bottom side is occupied by the second insulating layer 96. Accordingly, the recessed portions 76 of the heating units 68, 70 together with the second insulating layer 96 effectively together surround each of the fluid lines 34 when fully assembled. As can be seen in
As discussed above, in one non-limiting example, a mounting block 12 is provided with a heating element therein and the second insulating layer 96 may be installed thereon. A plurality of deposition valves 18 and fluid lines 34 interconnecting the deposition valves 18 may be provided on mounting block 12. An insulator unit 64 may include installing a first heating unit 68 and potentially a second heating unit assembly 70, each having a heating element 74, over fluid lines 34 such that the heating units surround less than all of each of the fluid lines 34 with recessed portions 76. Once fully installed, the first and second heating units 68, 70 in combination with the second insulating layer 96 completely surround each fluid line 34 where recessed portions 76 are located. The heating elements 74 are each separately controlled (i.e. heating element within first heating unit 68 is separately controlled from heating element within second heating unit 70) in one aspect, or the heating elements may be actuated by a single controller, depending on the desired outcome. Still further, since at least one thermocouple 42 may be located within each zone covered by a heating unit, the controller for each heating unit 68, 70 heating element 74 may be programmed to control the temperature at each thermocouple. The above discussion is merely exemplary and a person of skill in the art will immediately recognize that a variety of modifications can be achieved without departing from the spirit and scope of the detailed description.
These and other embodiments for methods and apparatus for a valve assembly to maintain efficient heating may incorporate concepts, embodiments, and configurations as described with respect to embodiments of apparatus for valve assemblies described above. The particular implementations shown and described are illustrative of the invention and its best mode and are not intended to otherwise limit the scope of the aspects and implementations in any way. Indeed, for the sake of brevity, conventional manufacturing, connection, preparation, and other functional aspects of the system may not be described in detail. Furthermore, the connecting lines shown in the various figures are intended to represent exemplary functional relationships and/or physical couplings between the various elements. Many alternative or additional functional relationship or physical connections may be present in the practical system, and/or may be absent in some embodiments.
As used herein, the terms “comprises”, “comprising”, or any variation thereof, are intended to reference a non-exclusive inclusion, such that a process, method, article, composition or apparatus that comprises a list of elements does not include only those elements recited, but may also include other elements not expressly listed or inherent to such process, method, article, composition or apparatus. Other combinations and/or modifications of the above-described structures, arrangements, applications, proportions, elements, materials or components used in the practice of the present invention, in addition to those not specifically recited, may be varied or otherwise particularly adapted to specific environments, manufacturing specifications, design parameters or other operating requirements without departing from the general principles of the same.
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20130104992 A1 | May 2013 | US |
Number | Date | Country | |
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Parent | 13283408 | Oct 2011 | US |
Child | 13312591 | US |