Valve design and configuration for fast delivery system
Embodiments of the invention relate to an apparatus for rapid delivery of pulses of one or more reactants to a substrate processing chamber. In one embodiment, a valve assembly includes a valve body having at least two ports comprising a purge inlet and an outlet, a valve seat surrounding one of the ports, an annular groove formed around the valve seat coupling the purge inlet and the outlet, and a diaphragm assembly. The diaphragm assembly further includes a diaphragm movable to contact the valve seat, a piston coupled to the diaphragm, and a cylinder to house the piston. In another embodiment, the cylinder forms an actuation chamber having an internal volume of about 3.0 cm3.
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This application is a continuation of co-pending U.S. Ser. No. 10/199,482 (APPM/007159), filed Jul. 19, 2002, which is herein incorporated in its entirety by reference.
BACKGROUND OF THE INVENTION1. Field of the Invention
Embodiments of the present invention relate to a method and apparatus for delivery of one or more reactants to a substrate processing chamber. More particularly, embodiments of the present invention relate to a valve assembly for rapid delivery of pulses of one or more reactants to a substrate processing chamber.
2. Description of the Related Art
Reliably producing sub-micron and smaller features is one of the key technologies for the next generation of very large scale integration (VLSI) and ultra large scale integration (ULSI) of semiconductor devices. However, as the fringes of circuit technology are pressed, the shrinking dimensions of interconnects in VLSI and ULSI technology have placed additional demands on the processing capabilities. The multilevel interconnects that lie at the heart of this technology require precise processing of high aspect ratio features, such as vias and other interconnects. Reliable formation of these interconnects is very important to VLSI and ULSI success and to the continued effort to increase circuit density and quality of individual substrates.
As circuit densities increase, the widths of vias, contacts, and other features, as well as the dielectric materials between them, decrease to sub-micron dimensions (e.g., less than 0.20 micrometers or less), whereas the thickness of the dielectric layers remains substantially constant, with the result that the aspect ratios for the features, i.e., their height divided by width, increase. Many traditional deposition processes have difficulty filling sub-micron structures where the aspect ratio exceeds 4:1, and particularly where the aspect ratio exceeds 10:1. Therefore, there is a great amount of ongoing effort being directed at the formation of substantially void-free and seam-free sub-micron features having high aspect ratios.
Atomic layer deposition is one deposition technique being explored for the deposition of material layers over features having high aspect ratios. One example of atomic layer deposition comprises the sequential introduction of pulses of gases. For instance, one cycle for the sequential introduction of pulses of gases may comprise a pulse of a first reactant gas, followed by a pulse of a purge gas and/or a pump evacuation, followed by a pulse of a second reactant gas, and followed by a pulse of a purge gas and/or a pump evacuation. The term “gas” as used herein is defined to include a single gas or a plurality of gases. Sequential introduction of separate pulses of the first reactant and the second reactant may result in the alternating self-limiting adsorption of monolayers of the reactants on the surface of the substrate, thus forming a thin layer of material for each cycle. The cycle may be repeated to a desired thickness of the deposited material. A pulse of a purge gas and/or a pump evacuation between the pulses of the first reactant gas and the pulses of the second reactant gas serves to reduce the likelihood of gas phase reactions of the reactants due to excess amounts of the reactants remaining in the chamber. However, various problems exist with current gas delivery apparatuses used to perform atomic layer deposition, such as slow delivery of reactants, generation of particles, and/or failure over time of components of the gas delivery apparatuses.
Therefore, there is a need for new apparatuses and methods to perform gas delivery.
SUMMARY OF THE INVENTIONEmbodiments of the present invention relate to a method and apparatus for rapid delivery of pulses of one or more reactants to a substrate processing chamber. One embodiment of a valve body includes a first inlet, a second inlet, and an outlet. A valve chamber is in fluid communication with the first inlet, the second inlet, and the outlet. A valve seat is formed at least around the first inlet. The valve chamber further includes an annular groove formed around the valve seat coupling the second inlet and the outlet.
One embodiment of a pneumatic valve assembly includes a valve body having at least two ports. A valve seat surrounds one of the ports. The pneumatic valve assembly further includes a diaphragm assembly having a diaphragm movable to open and close the one port. A piston housed in a cylinder is coupled to the diaphragm to actuate the diaphragm. An actuation chamber is formed between the cylinder and the piston. In certain embodiments, the internal volume of the actuation chamber is about 3.0 cm3 or less.
Another embodiment of a pneumatic valve assembly includes a valve body having at least two ports. The pneumatic valve assembly further includes a pneumatic piston coupled to move a diaphragm between an open position and a closed position. The diaphragm in the closed position closes one of the at least two ports. The pneumatic piston is adapted to move the diaphragm between the open position and the closed position in a response time of about 50 milliseconds or less.
One embodiment of substrate processing chamber includes a chamber body and one or more valves adapted to provide one or more reactants into the chamber body. Each valve includes a valve body having at least two ports, a valve seat surrounding one of the ports, and a diaphragm assembly. The diaphragm assembly includes a diaphragm movable to open and close the one port, a piston coupled to the diaphragm, and a cylinder to house the piston. The cylinder forms an actuation chamber. In certain embodiments, the internal volume of the actuation chamber is about 3.0 cm3 or less. The substrate processing chamber may further include an electronically controlled valve adapted to provide pressurized gas to the actuation chamber of the valves from a pressurized gas supply.
One embodiment of a method of delivering pulses of a reactant into a substrate processing chamber includes introducing a pressurized gas to an actuation chamber of a valve assembly and releasing the pressurized gas from the actuation chamber of the valve assembly. Introducing the pressurized gas and releasing the pressurized gas provides a pulse time of about 1.0 second or less.
BRIEF DESCRIPTION OF THE DRAWINGSSo that the manner in which the above recited features, advantages and objects of the present invention are attained and can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to the embodiments thereof which are illustrated in the appended drawings.
It is to be noted, however, that the appended drawings illustrate only typical embodiments of this invention and are therefore not to be considered limiting of its scope, for the invention may admit to other equally effective embodiments.
Embodiments of the present invention relate to a valve assembly for delivery of one or more reactants to a substrate processing chamber. More particularly, embodiments of the present invention relate to a valve assembly for rapid delivery of pulses of one or more reactants to a substrate processing chamber. Reactants can be precursors, reducing agents, oxidizing agents, catalysts, and mixtures thereof.
Referring to
Referring to
Referring to
In certain preferred embodiments, in a closed position, the diaphragm 134 does not block the in flow of the purge gas from the purge inlet 114 through the valve chamber 111 to the outlet 116 and into the chamber body 20. As shown in
Still referring to
The valve body 110 may further comprise one or more mounting holes 140 for mounting the valve assembly 100 to chamber components. The valve body 110 may further include a receptacle 118 around each of the reactant inlet 112, the purge inlet 114, and the outlet 116 for receiving an o-ring 119 to prevent leaks between the valve body 110 and chamber components. The receptacle 118 preferably has a round cross-section to better house an o-ring 119. The receptacle 118 may also be any other suitable shape. The o-rings 119 may be made of a polymer (i.e. synthetic or natural rubber), a metal, or metal alloy and is preferably made of an elastic polymer. In addition or alternatively, chamber components may include receptacles for receiving o-rings.
In operation, the electronically controlled valve 152 when open supplies pressurized gas through the connector 349 into the actuation chamber 346 creating a pressure that forces the piston 342 and the stem 336 downward against the elastic force of spring 344. The center portion of the diaphragm 134 is pressed downward by stem 336 and comes into contact with the valve seat 120 closing the inflow of reactant from the reactant inlet 112 to the outlet 116. When the diaphragm 134 is in contact with the valve seat 120, the diaphragm 134 does not block off the groove 122 and a purge gas may flow from the purge gas inlet 114 to the outlet 116. The electronically controlled valve 152, when closed, stops the supply of pressurized gas and releases the pressurized gas inside the actuation chamber 346. When the supply of pressurized gas is stopped and pressure inside the actuation chamber 346 is released, the piston 342 and the stem 336 are raised by the elastic force of the spring 344. As the piston 342 and the stem 336 rise, the diaphragm 134A moves away from the valve seat 120 of the valve body 110 allowing the inflow of reactant from the reactant inlet 112 to the outlet 116.
In operation, the electronically controlled valve 152, when open, supplies pressurized gas through the connector 449 into the actuation chamber 446 creating a pressure that forces the piston 442 and the stem 436 upward against the elastic force of spring 444. The center portion of the diaphragm 134B is pulled upward by stem 436 away from the valve seat 420 allowing inflow of reactant from the reactant inlet 112 to the outlet 116. The electronically controlled valve 152 when closed stops the supply of pressurized gas and releases the pressurized gas inside the actuation chamber 446. When the supply of pressurized gas is stopped and pressure inside the actuation chamber 446 is released, the piston 442 and the stem 432 are lowered by the elastic force of the spring 444 so that the diaphragm 134B comes into contact with the valve seat 120 closing the inflow of reactant from the reactant inlet 112 to the outlet 116. When the diaphragm 134B is in contact with the valve seat 120, the diaphragm 134B does not block off the groove 122 and the purge gas may flow from the purge gas inlet 114 to the outlet 116.
In reference to
In one aspect, pneumatic control of the diaphragm 134 provides a “soft” landing of the diaphragm 134 against the valve seat 120 in comparison to diaphragms driven up and down by a solenoid. The “soft” landing reduces the formation of particles during movement of the diaphragm between an open position and a closed position caused by the impact of the diaphragm 134 against the valve seat 120. The “soft” landing also provides the reactant through the valve assembly 100 in more of a laminar flow in comparison to a “hard” landing caused by moving the diaphragm directly by a solenoid.
In certain embodiments, the internal volume of the actuation chamber 346, 446 comprises a small volume, preferably about 3.0 cm3 or less, more preferably about 1.0 cm3 or less. The term “internal volume of the actuation chamber” as used herein refers to the inner volume of the actuation chamber when the pressure inside the actuation chamber is released and includes the inner volume of the connector 349, 449 and any gas lines between the actuation chamber 346, 446 and the electrically controlled valve 152. A small internal volume of the actuation chamber 346, 446 can be pressurized more rapidly and as a consequence can actuate the diaphragm 134A, B more rapidly.
Reducing the response time of a valve assembly permits more cycles of pulses of reactants to be provided over time. Therefore, throughput of processing substrates is increased. However, the valve assembly can be operated to any desired pulse time 720. The term “pulse time” as used herein is defined as the time to move the diaphragm from a fully closed position to a fully open position and back to fully closed position. The valve assembly 100 may be operated to provide pulse times of about 1.0 second or less, about 500 milliseconds or less, and even about 200 milliseconds or less.
As shown in
Referring to
In one embodiment, the valve assembly 100 may be used with a chamber lid, such as the chamber lid 32 as described in reference to
The expanding channel 34 comprises a channel which has an inner diameter which increases from an upper portion 37 to the lower portion 35 of the expanding channel 34 adjacent the bottom surface 60 of the chamber lid 32. Whether a gas is provided toward the walls of the expanding channel 34 or directly downward towards the substrate, the velocity of the gas flow decreases as the gas flow travels through the expanding channel 34 due to the expansion of the gas. The reduction of the velocity of the gas flow helps reduce the likelihood the gas flow will blow off reactants adsorbed on the surface of the substrate.
At least a portion of the bottom surface 60 of the chamber lid 32 may be tapered from the expanding channel 34 to a peripheral portion of the chamber lid 32 to help provide an improved velocity profile of a gas flow from the expanding channel 34 across the surface of the substrate (i.e., from the center of the substrate to the edge of the substrate). In one embodiment, the bottom surface 60 is tapered in the shape of a funnel. Not wishing to be bound by theory, in one aspect, the bottom surface 60 is downwardly sloping to help reduce the variation in the velocity of the gases as it travels between the bottom surface 60 of the chamber lid 32 and the substrate to help provide uniform exposure of the surface of the substrate to a reactant.
The chamber lid 32 is further described in commonly assigned U.S. Ser. No. 10/032,284, entitled “Gas Delivery Apparatus and Method for Atomic Layer Deposition,” filed on Dec. 21, 2001, and issued Sep. 13, 1988 as U.S. Pat. No. 6,916,398, which claims benefit of U.S. Ser. No. 60/346,086, entitled “Method and Apparatus for ALD Deposition,” filed Oct. 26, 2001, which are both incorporated by reference in their entirety to the extent not inconsistent with the present disclosure.
The valve assembly 100 may be used with other chamber lids. For example, the valve assembly 100 may be used with the chamber lid described in commonly assigned U.S. Ser. No. 10/032,293 entitled, “Chamber Hardware Design For Titanium Nitride Atomic Layer Deposition,” filed on Dec. 21, 2001, and published as US 2003-0116087, which is incorporated by reference in its entirety to the extent not inconsistent with the present disclosure. The valve assembly 100 may also be used with the chamber lid as described in U.S. Ser. No. 10/016,300, entitled “Lid Assembly For A Processing System To Facilitate Sequential Deposition Techniques,” filed on Dec. 12, 2001, and issued on Apr. 12, 2005 as U.S. Pat. No. 6,878,206, which claims priority to U.S. Ser. No. 60/305,970, filed on Jul. 16, 2001, which are both incorporated by reference in their entirety to the extent not inconsistent with the present disclosure. The valve assembly 100 may also be used with the chamber lid as described in commonly assigned U.S. Pat. No. 6,911,391, issued Jun. 28, 2005, which claims priority to U.S. Ser. No. 60/352,191, which are both incorporated by reference in their entirety to the extent not inconsistent with the present disclosure.
The valve assembly 100 as shown and described in reference to
The valve assembly 100 may be used to form tantalum nitride, tantalum, tantalum silicon nitride, copper, copper aluminum, titanium nitride, titanium, titanium silicon nitride, tungsten nitride, tungsten, tungsten silicon nitride, metal oxides, organosilanes or organosiloxanes, other refractory metals, other refractory metal nitrides, other refractory metal compounds, other metals, other metal alloys, other high dielectric constant materials, and other low dielectric constant materials.
For example, a substrate processing chamber, such as chamber 10 of
While the foregoing is directed to embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.
Claims
1. A pneumatic valve assembly, comprising:
- a valve body having at least two ports comprising a purge inlet and an outlet;
- a valve seat surrounding one of the ports;
- an annular groove formed around the valve seat coupling the purge inlet and the outlet; and
- a diaphragm assembly, comprising: a diaphragm movable to contact the valve seat; a piston coupled to the diaphragm; and a cylinder to house the piston.
2. The pneumatic valve assembly of claim 1, wherein the cylinder forms an actuation chamber having an internal volume of about 3.0 cm3 or less.
3. The pneumatic valve assembly of claim 2, wherein the internal volume is about 1.0 cm3 or less.
4. The pneumatic valve assembly of claim 1, wherein the at least two ports of the valve body further comprise a reactant inlet.
5. The pneumatic valve assembly of claim 4, wherein the diaphragm in a closed position closes the reactant inlet, while the purge inlet and the outlet remain opened.
6. The pneumatic valve assembly of claim 1, further comprising a controller adapted to move the diaphragm between an open position and a closed position within a time period of about 1 second or less.
7. The pneumatic valve assembly of claim 6, wherein the time period is about 500 milliseconds or less.
8. The pneumatic valve assembly of claim 7, wherein the time period is about 200 milliseconds or less.
9. The pneumatic valve assembly of claim 8, wherein the time period is about 50 milliseconds or less.
10. The pneumatic valve assembly of claim 9, wherein the time period is about 20 milliseconds or less.
11. The pneumatic valve assembly of claim 2, further comprising an electronically controlled valve adapted to provide pressurized gas to the actuation chamber from a pressurized gas supply.
12. The pneumatic valve assembly of claim 11, wherein the electronically controlled valve is mounted to the cylinder of the diaphragm assembly.
13. The pneumatic valve assembly of claim 11, wherein the electronically controlled valve is coupled to the cylinder through a gas line having a length of about 2.54 cm or less.
14. The pneumatic valve assembly of claim 1, further comprising an embedded heating element within the valve body.
15. The pneumatic valve assembly of claim 14, further comprising an embedded thermocouple within the valve body.
16. The pneumatic valve of claim 4, wherein the purge inlet, the reactant inlet, and the outlet each contain an o-ring.
17. The pneumatic valve of claim 16, wherein the purge inlet, the reactant inlet, and the outlet each contain a receptacle for containing the o-ring.
18. A pneumatic valve assembly, comprising:
- a valve body having at least three ports comprising a purge inlet, an outlet, and a reactant inlet;
- a valve seat surrounding one of the ports;
- an annular groove formed around the valve seat coupling the purge inlet and the outlet; and
- a diaphragm assembly.
19. The pneumatic valve of claim 18, wherein the diaphragm assembly further comprises:
- a diaphragm movable to contact the valve seat;
- a piston coupled to the diaphragm; and
- a cylinder to house the piston.
20. The pneumatic valve of claim 18, wherein the purge inlet, the reactant inlet, and the outlet each contain an o-ring.
21. The pneumatic valve of claim 20, wherein the purge inlet, the reactant inlet, and the outlet each contain a receptacle for containing the o-ring.
22. The pneumatic valve assembly of claim 19, further comprising a controller adapted to move the diaphragm between an open position and a closed position within a time period of about 1 second or less.
23. The pneumatic valve assembly of claim 22, wherein the time period is in about 200 milliseconds or less.
24. The pneumatic valve assembly of claim 23, wherein the time period is in about 20 milliseconds or less.
25. The pneumatic valve assembly of claim 19, wherein the cylinder forms an actuation chamber having an internal volume of about 3.0 cm3 or less.
26. The pneumatic valve assembly of claim 25, wherein the internal volume is about 1.0 cm3 or less.
27. A pneumatic valve assembly, comprising:
- a valve body comprises a purge inlet, an outlet, and a reactant inlet;
- a valve seat surrounding the purge inlet, the outlet, or the reactant inlet;
- an annular groove formed around the valve seat coupling the purge inlet and the outlet; and
- a diaphragm assembly, comprising: a diaphragm movable to contact the valve seat; a piston coupled to the diaphragm; and a cylinder to house the piston.
28. The pneumatic valve of claim 27, wherein the purge inlet, the reactant inlet, and the outlet each contain an o-ring.
29. The pneumatic valve of claim 28, wherein the purge inlet, the reactant inlet, and the outlet each contain a receptacle for containing the o-ring.
30. The pneumatic valve assembly of claim 27, further comprising a controller adapted to move the diaphragm between an open position and a closed position within a time period of about 1 second or less.
31. The pneumatic valve assembly of claim 30, wherein the time period is in about 200 milliseconds or less.
32. The pneumatic valve assembly of claim 31, wherein the time period is in about 20 milliseconds or less.
33. The pneumatic valve assembly of claim 27, wherein the cylinder forms an actuation chamber having an internal volume of about 3.0 cm3 or less.
34. The pneumatic valve assembly of claim 33, wherein the internal volume is about 1.0 cm3 or less.
35. A pneumatic valve assembly, comprising:
- a valve body having at least two ports comprising a purge inlet and an outlet;
- an annular groove coupling the purge inlet and the outlet; and
- a diaphragm assembly coupled to the valve body, wherein the diaphragm assembly comprises: a diaphragm; a piston coupled to the diaphragm; and a cylinder to house the piston, wherein the cylinder forms an actuation chamber having an internal volume of about 3.0 cm3 or less.
Type: Application
Filed: May 11, 2006
Publication Date: Sep 28, 2006
Applicant:
Inventors: Vincent Ku (San Jose, CA), Ling Chen (Sunnyvale, CA), Dien-Yeh Wu (San Jose, CA)
Application Number: 11/432,101
International Classification: F16K 49/00 (20060101);