US4842686A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wafer processing apparatus and method
Assignee: Texas Instruments Inc
•
Filing: 1987-07-17
•
Granted: 1989-06-27
•
Expires: 2007-07-17
Abstract
Abstract A plasma reactor with in situ ultraviolet generation processing aparatus and method. Ultraviolet light to illuminate the face of a wafer being processed is generated by a plasma which is within the vacuum processing chamber but is remote from the face of the wafer. It is useful to design the gas flow system so that the ultraviolet-generating plasma has its own gas feed, and the reaction products from the ultraviolet-generating plasma do not substantially flow or diffuse to the wafer face. A transparent isolator between the ultraviolet plasma space and the processing space near the wafer face is useful so that the ultraviolet plasma can be operated at a vacuum level slightly different from that used near the wafer face, but this transparent window is not made thick enough to act as a full vacuum seal. Optionally, this window may be omitted entirely.
Inventors
- 👤 Cecil J. Davis
- 👤 Lee M. Loewenstein
- 👤 Robert T. Matthews
- 👤 John I. Jones
- 👤 Rhett B. Jucha
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:30
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/70; G03F7/708; G03F7/70808; C; C23; C23C; C23C16/00; C23C16/44; C23C16/48; C23C16/482; C23C16/50; C23C16/517; C23C16/54; G03F7/70858; G03F7/70866
Claims Analysis
Total Claims: 73
Claim 1
Independent Claim
77 words
An apparatus for vacuum processing of wafers, comprising: (a) a vacuum processing chamber; (b) a wafer support within said vacuum processing chamber, said wafer support being capable of supporting a wafer; (c) gas flow passages positioned to permit release of a desired process gas flow in proximity to the surface of the wafer; and (d) an ultraviolet energy source within said vacuum processing chamber separate from the wafer and positioned to illuminate the wafer with ultraviolet energy.
Claim 2
Independent Claim
77 words
An apparatus for vacuum processing of wafers, comprising: (a) a vacuum processing chamber; (b) a wafer support within said vacuum processing chamber, said wafer support being capable of supporting a wafer; (c) gas flow passages positioned to permit release of a desired process gas flow in proximity to the surface of the wafer; and (d) an ultraviolet energy source within said vacuum processing chamber separate from the wafer and positioned to illuminate the wafer with ultraviolet energy.
Claim 3
Independent Claim
68 words
A method for processing of wafer, comprising the steps of: (a) transferring a wafer into a vacuum processing chamber; (b) flowing a desired mixture of process gases through the space in proximity to the surface of the wafer; and (c) illuminating the surface of said wafer with ultraviolet light generated by plasma which is within said chamber but which is generated remotely from the surface of said wafer.
Claim 4
Independent Claim
68 words
A method for processing of wafer, comprising the steps of: (a) transferring a wafer into a vacuum processing chamber; (b) flowing a desired mixture of process gases through the space in proximity to the surface of the wafer; and (c) illuminating the surface of said wafer with ultraviolet light generated by plasma which is within said chamber but which is generated remotely from the surface of said wafer.
Claim 5
Dependent Claim
78 words
The apparatus of claim 1, wherein said load lock is connected to an adjacent vacuum processing chamber by a vacuum port, and wherein said vacuum port is also controlled by said control system, and wherein said control system is programmed to prevent opening of said vacuum port until said output signal has indicated that substantially no particulate has been present in the space within the interior of said processing chamber for at least a predetermined period of time.
Claim 6
Dependent Claim
27 words
The apparatus of claim 1, further comprising an environmental and vacuum control device for maintaining a vacuum in said processing chamber and for removal of any particulate.
Claim 7
Dependent Claim
27 words
The apparatus of claim 1, wherein the wafer is supported in a manner such that a side on which circuit components are to be formed faces downward.
Claim 8
Dependent Claim
17 words
The apparatus of claim 1 further comprising a source of radiant energy radiatively coupled to said wafer.
Claim 9
Dependent Claim
21 words
The apparatus of claim 6, wherein said source of radiant energy provides maximum specific power at wavelengths in the visible range.
Claim 10
Dependent Claim
16 words
The apparatus of claim 6, wherein said radiant energy source comprises a plurality of incandescent lamps.
Claim 11
Dependent Claim
20 words
The apparatus of claim 6 wherein the radiant heat source reflectors are cooled by contact with a water cooled housing.
Claim 12
Dependent Claim
20 words
The apparatus of claim 6, further comprising a transparent vacuum wall separating said source of radiant energy from the wafer.
Claim 13
Dependent Claim
27 words
The apparatus of claim 10, wherein said vacuum wall is sealed to said chamber by a radially elastically expandable metallic seal which includes a deformable soft portion.
Claim 14
Dependent Claim
11 words
The apparatus of claim 5 further comprising at least one reflector.
Claim 15
Dependent Claim
15 words
The apparatus of claim 12 wherein said at least one reflector is coated with gold.
Claim 16
Dependent Claim
36 words
The apparatus of claim 1, further comprising: (a) a gas supply; (b) a microwave power source; (c) a microwave cavity in which power supplied by the microwave power source excites the gas from the gas supply.
Claim 17
Dependent Claim
63 words
The apparatus of claim 1, wherein said internal ultraviolet source comprises: (a) a ultraviolet chamber bounded on one side by the process chamber; (b) a gas supply to the ultraviolet chamber; (c) a thin window substantially transparent to ultraviolet light separating the process chamber from the ultraviolet chamber; (d) an electrode for coupling radio frequency energy to a plasma inside said ultraviolet chamber.
Claim 18
Dependent Claim
15 words
The apparatus of claim 15, wherein said thin window of said ultraviolet source comprises quartz.
Claim 19
Dependent Claim
15 words
The apparatus of claim 15, wherein said thin window of said ultraviolet source comprises sapphire.
Claim 20
Independent Claim
72 words
An apparatus for processing a workpiece comprising: (a) a vacuum processing chamber within a process module; (b) a support capable of engaging said workpiece with said chamber; (c) gas distributors positioned within said chamber to direct a process gas to a face of said workpiece; and (d) an ultraviolet energy source within said module away from the face of said workpiece positioned to couple ultraviolet energy to the space adjacent the face.
Claim 21
Independent Claim
72 words
An apparatus for processing a workpiece comprising: (a) a vacuum processing chamber within a process module; (b) a support capable of engaging said workpiece with said chamber; (c) gas distributors positioned within said chamber to direct a process gas to a face of said workpiece; and (d) an ultraviolet energy source within said module away from the face of said workpiece positioned to couple ultraviolet energy to the space adjacent the face.
Claim 22
Dependent Claim
19 words
The apparatus as set forth in claim 18 including a plate between said ultraviolet energy source and said workpiece.
Claim 23
Dependent Claim
21 words
The apparatus as set forth in claim 18 wherein said plate has a different pressure on one side than another side.
Claim 24
Independent Claim
64 words
A method of processing a workpiece comprising the steps of: (a) disposing said workpiece into a process chamber of a process module at low pressure; (b) introducing process gas into said chamber to a face of said workpiece; and (c) generating ultraviolet energy within said module remote from the face of said workpiece and coupled to the space within said chamber adjacent the face.
Claim 25
Independent Claim
64 words
A method of processing a workpiece comprising the steps of: (a) disposing said workpiece into a process chamber of a process module at low pressure; (b) introducing process gas into said chamber to a face of said workpiece; and (c) generating ultraviolet energy within said module remote from the face of said workpiece and coupled to the space within said chamber adjacent the face.
Claim 26
Dependent Claim
27 words
A vacuum process module for processing a workpiece comprising: (a) a heater coupled to said workpiece; and (b) a source of ultraviolet light coupled to said workpiece.
Claim 27
Dependent Claim
27 words
A vacuum process module for processing a workpiece comprising: (a) a heater coupled to said workpiece; and (b) a source of ultraviolet light coupled to said workpiece.
Claim 28
Dependent Claim
19 words
A module as set forth in claim 22 wherein said workpiece has its face to be processed facing downward.
Claim 29
Dependent Claim
21 words
The module as set forth in claim 22 wherein said ultraviolet source and said heater are separately controlled to operate singly.
Claim 30
Dependent Claim
23 words
The module as set forth in claim 22 wherein said ultraviolet source and said heater are separately controlled to operate in any combination.
Claim 31
Dependent Claim
15 words
The module as set forth in claim 22 wherein said heater is a radiant heater.
Claim 32
Dependent Claim
19 words
The module as set forth in claim 26 wherein said radiant heater is located above said workpiece during processing.
Claim 33
Dependent Claim
15 words
The module as set forth in claim 26 wherein said heater is a conductive heater.
Claim 34
Dependent Claim
19 words
The module as set forth in claim 22 wherein said ultraviolet source is located below said workpiece during processing.
Claim 35
Dependent Claim
23 words
The module as set forth in claim 22 wherein said ultraviolet source is separated from and in fluid communication with the process chamber.
Claim 36
Dependent Claim
14 words
The module as set forth in claim 22 wherein the workpiece is a wafer.
Claim 37
Independent Claim
60 words
An apparatus for vacuum processing of wafers, comprising: (a) a first chamber; (b) a second chamber within said first chamber with a wafer disposed therein; (c) gas flow passages positioned to provide a gas to the wafer; and (d) an ultraviolet energy source within a third chamber which is within said first chamber to illuminate the wafer with ultraviolet energy.
Claim 38
Independent Claim
60 words
An apparatus for vacuum processing of wafers, comprising: (a) a first chamber; (b) a second chamber within said first chamber with a wafer disposed therein; (c) gas flow passages positioned to provide a gas to the wafer; and (d) an ultraviolet energy source within a third chamber which is within said first chamber to illuminate the wafer with ultraviolet energy.
Claim 39
Dependent Claim
27 words
The apparatus of claim 32, further, comprising an environmental and vacuum control device for maintaining a vacuum in said processing chamber and for removal of any particulate.
Claim 40
Dependent Claim
27 words
The apparatus of claim 32, wherein the wafer is supported in a manner such that a side on which circuit components are to be formed faces downward.
Claim 41
Dependent Claim
17 words
The apparatus of claim 32 further comprising a source of radiant energy radiatively coupled to said wafer.
Claim 42
Dependent Claim
21 words
The apparatus of claim 35 wherein said source of radiant energy provides maximum specific power at wavelengths in the visible range.
Claim 43
Dependent Claim
16 words
The apparatus of claim 35, wherein said radiant energy source comprises a plurality of incandescent lamps.
Claim 44
Dependent Claim
20 words
The apparatus of claim 35 wherein the radiant heat source reflectors are cooled by contact with a water cooled housing.
Claim 45
Dependent Claim
20 words
The apparatus of claim 35, further comprising a transparent vacuum wall separating said source of radiant energy from the wafer.
Claim 46
Dependent Claim
27 words
The apparatus of claim 39, wherein said vacuum wall is sealed to said chamber by a radially elastically expandable metallic seal which includes a deformable soft portion.
Claim 47
Dependent Claim
11 words
The apparatus of claim 35 further comprising at least one reflector.
Claim 48
Dependent Claim
15 words
The apparatus of claim 41 wherein said at least one reflector is coated with gold.
Claim 49
Dependent Claim
36 words
The apparatus of claim 32, further comprising: (a) a gas supply; (b) a microwave power source; (c) a microwave cavity in which power supplied by the microwave power source excites the gas from the gas supply.
Claim 50
Dependent Claim
14 words
The apparatus of claim 32 further including a gas supply to said third chamber.
Claim 51
Dependent Claim
23 words
The apparatus of claim 32 further including a thin window substantially transparent to ultraviolet light separating the process chamber from said third chamber.
Claim 52
Dependent Claim
21 words
The apparatus of claim 32 further including an electrode for coupling radio frequency energy to a plasma inside said third chamber.
Claim 53
Dependent Claim
15 words
The apparatus of claim 45, wherein said thin window of said ultraviolet source comprises quartz.
Claim 54
Dependent Claim
15 words
The apparatus of claim 45, wherein said thin window of said ultraviolet source comprises sapphire.
Claim 55
Independent Claim
72 words
An apparatus for processing a workpiece comprising: (a) a vacuum processing chamber within a process module; (b) a support capable of engaging said workpiece with said chamber; (c) gas distributors positioned within said chamber to direct a process gas to a face of said workiece; and (d) an ultraviolet energy source within said module away from the face of said workpiece positioned to couple ultraviolet energy to the space adjacent the face.
Claim 56
Independent Claim
72 words
An apparatus for processing a workpiece comprising: (a) a vacuum processing chamber within a process module; (b) a support capable of engaging said workpiece with said chamber; (c) gas distributors positioned within said chamber to direct a process gas to a face of said workiece; and (d) an ultraviolet energy source within said module away from the face of said workpiece positioned to couple ultraviolet energy to the space adjacent the face.
Claim 57
Dependent Claim
19 words
The apparatus as set forth in claim 49 including a plate between said ultraviolet energy source and said workpiece.
Claim 58
Dependent Claim
21 words
The apparatus as set forth in claim 49 wherein said plate has a different pressure on one side than another side.
Claim 59
Dependent Claim
27 words
The apparatus of claim 49, wherein the wafer is supported in a manner such that a side on which circuit components are to be formed faces downward.
Claim 60
Independent Claim
66 words
The method for processing of wafers, comprising the steps of: (a) transferring a wafer into a processing chamber; (b) introducing process gases into a first chamber within said processing chamber; (c) illuminating the surface of said wafer with ultraviolet light generated by a plasma which is generated in a second chamber separate from said first chamber and within and in fluid communication with said processing chamber.
Claim 61
Independent Claim
66 words
The method for processing of wafers, comprising the steps of: (a) transferring a wafer into a processing chamber; (b) introducing process gases into a first chamber within said processing chamber; (c) illuminating the surface of said wafer with ultraviolet light generated by a plasma which is generated in a second chamber separate from said first chamber and within and in fluid communication with said processing chamber.
Claim 62
Dependent Claim
27 words
The method of claim 53, wherein the wafer is supported in a manner such that a side on which circuit components are to be formed faces downward.
Claim 63
Independent Claim
64 words
A method of processing a workpiece comprising the steps of: (a) disposing said workpiece into a process chamber of a process module at low pressure; (b) introducing process gas into said chamber to a face of said workpiece; and (c) generating ultraviolet energy within said module remote from the face of said workpiece and coupled to the space within said chamber adjacent the face.
Claim 64
Independent Claim
64 words
A method of processing a workpiece comprising the steps of: (a) disposing said workpiece into a process chamber of a process module at low pressure; (b) introducing process gas into said chamber to a face of said workpiece; and (c) generating ultraviolet energy within said module remote from the face of said workpiece and coupled to the space within said chamber adjacent the face.
Claim 65
Dependent Claim
73 words
A vacuum processing module comprising: (a) a process chamber with a wafer disposed therein; (b) a first chamber within and in fluid communication with said process chamber; (c) a heater coupled to said first chamber; (d) a second chamber within and in fluid communication with said process chamber, separate from said first chamber; and (e) a source of ultraviolet energy within said second chamber, said energy source being positioned to illuminate said wafer.
Claim 66
Dependent Claim
73 words
A vacuum processing module comprising: (a) a process chamber with a wafer disposed therein; (b) a first chamber within and in fluid communication with said process chamber; (c) a heater coupled to said first chamber; (d) a second chamber within and in fluid communication with said process chamber, separate from said first chamber; and (e) a source of ultraviolet energy within said second chamber, said energy source being positioned to illuminate said wafer.
Claim 67
Dependent Claim
21 words
The module as set forth in claim 56 wherein said ultraviolet source and said heater are separately controlled to operate singly.
Claim 68
Dependent Claim
23 words
The module as set forth in claim 56 wherein said ultraviolet source and said heater are separately controlled to operate in any combination.
Claim 69
Dependent Claim
15 words
The module as set forth in claim 56 wherein said heater is a radiant heater.
Claim 70
Dependent Claim
19 words
The module as set forth in claim 56 wherein said radiant heater is located above said workpiece during processing.
Claim 71
Dependent Claim
15 words
The module as set forth in claim 56 wherein said heater is a conductive heater.
Claim 72
Dependent Claim
19 words
The module as set forth in claim 56 wherein said ultraviolet source is located below said wafer during processing.
Claim 73
Dependent Claim
27 words
The method of claim 55, wherein the wafer is supported in a manner such that a side on which circuit components are to be formed faces downward.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-06-26 | 1992-12-26 | 1993-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-26 | 1996-12-26 | 1997-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-26 | 2000-12-26 | 2001-06-27 | $7700.00 | Window Closed / Lapsed |