US20050161867A1 - Gasifier structure - Google Patents
Gasifier structure Download PDFInfo
- Publication number
- US20050161867A1 US20050161867A1 US11/085,098 US8509805A US2005161867A1 US 20050161867 A1 US20050161867 A1 US 20050161867A1 US 8509805 A US8509805 A US 8509805A US 2005161867 A1 US2005161867 A1 US 2005161867A1
- Authority
- US
- United States
- Prior art keywords
- furnace
- ion
- solid
- gasifier
- ion source
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B17/00—Furnaces of a kind not covered by any preceding group
- F27B17/0016—Chamber type furnaces
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/22—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the process of coating
- C23C14/24—Vacuum evaporation
- C23C14/243—Crucibles for source material
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/22—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the process of coating
- C23C14/48—Ion implantation
Definitions
- the present invention relates to a gasifier structure and, more particularly, to a gasifier which prevents the reduction of the total ion source obtained by the ion inplater in the gasifier from continuously gasifying the solid ion implater in the gasifier.
- an ion implant is very important technology in the transistor structure.
- the wafer is subjected to impact by the charge ion stream, which is the so-called dopant.
- the dopant obtains the sufficient energy
- the thin film is implanted to a desired depth, thereby changing the property of the material and providing the specific electrical property.
- the ion implant accurately controls the dopant concentration in the doping area.
- the dopant solution (the dose) is controlled by the ion stream current (the total ion amount in the ion stream) and the scanning ratio (the times which the wafer passes through the ion stream).
- the depth of the dopant is determined by the energy magnitude of the ion stream.
- the ion source in the ion stream is generally obtained from the solid ion source gasified in the gasifier.
- the structure of the conventional gasifier greatly reduces the total solid source amount in the furnace 12 as gasifying the solid ion source in the furnace 12 of the gasifier.
- phenomenon results in reducing the total gasified ion amount obtained by the ion impanter.
- a manual operation is required to arise the temperature in the gasifier in order to accelerate the subliming speed of the solid ion source or re-adjust the ion stream current. Therefore, the throughput of the ion implater is loss.
- the present invention provides a gasifier structure to overcome the disadvantages of reducing the solid ion source.
- the present invention provides a gasifier structure, comprising the size of an opening of the furnace less than the size of a bottom of the furnace, representing the narrow top and wide bottom furnace, which prevents the reduction of the ion source obtained by the ion inplater in the gasifier from gasifying the solid ion implater, and which prevents the loss cost and time from the manual operation required to arise the temperature in the gasifier.
- the present invention also provides a gasifier structure, comprising the size of an opening of the furnace less than the size of a bottom of the furnace, representing the narrow top and wide bottom furnace, thereby effectively preventing the greatly increase of the surface area of the solid/gaseous interface from the continuously sublimation of the solid ion source due to the heating, resulting in maintaining a total gasified ion amount obtained by the ion implater, in order to solve the disadvantage of re-adjusting the ion stream current.
- a preferred embodiment of the present invention provides a gasifier structure, comprising a furnace and a heating system, characterized by: the size of an opening of the furnace less than the size of a bottom of the furnace, representing the narrow top and wide bottom furnace.
- FIGS. 1 and 2 are cross-sectional views of a gasifier according to the prior art
- FIG. 3 is a cross-sectional view of a gasifier according to a preferred embodiment of the present invention.
- FIGS. 4 and 5 are the cross-sectional views of a heating system surrounding around the outer peripheral of the furnace according to a preferred embodiment of the present invention.
- FIG. 3 which shows a gasifier of the present invention, comprising the size of an opening less than the size of a bottom of the furnace, representing the narrow top and wide bottom furnace 14 .
- the furnace 14 can be a conical shape or angle conical shape, and a heating system 16 is surrounded around the outer peripheral of the furnace 14 .
- the solid/gaseous interface of the solid ion source 18 is designed as the narrow top and wide bottom based on the shape of the furnace 14 , thereby presenting the surface area (defining the surface area as A 1 ) of the solid/gaseous interface as shown in FIG. 4 greatly less than the surface area of the solid/gaseous interface (defining the surface area as A 2 ) as shown in FIG. 5 , that is, A 1 ⁇ A 2 .
- the ion implater obtains the total ion amount which is F 1 ⁇ A 1 . If the heating time is longer is longer, as shown in FIG. 5 , the ion implater obtains the total ion amount which is F 2 ⁇ A 2 . At this time, F 1 ⁇ A 1 ⁇ F 2 ⁇ A 2 . Since the size of an opening of the furnace is less than a size of a bottom of the furnace, A 2 is greatly larger than A 1 , thereby supplementing a situation which F 2 is greatly less than F 1 .
- the present invention provides a gasifier which a furnace structure is represented by the size of the opening less than the size of the bottom, in order to effectively offsetting the greatly sublimation of the solid ion source caused by the furnace having the same width on the top and the bottom due to the sufficient heat energy, and in order to effectively offsetting the greatly reduction of total ion amount obtained by the ion implater as reducing the solid ion source, thereby preventing the re-adjustment of the electron beam from the conventional technology, and preventing the throughput reduction from arising the temperature in the gasifier to obtain an identical total ion amount.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- General Engineering & Computer Science (AREA)
- Electron Sources, Ion Sources (AREA)
Abstract
A gasifer comprising the size of an opening of the furnace less than the size of a bottom of the furnace, representing the narrow top and wide bottom furnace, with a heating system surrounding around the outer peripheral of the furnace. A heating is performed on the solid ion source. As continuously reducing the solid ion source during the heating, the surface area of the solid/ gaseous interface effectively offsets the reduction of the total amount obtained by the ion implater due to the reduction of the solid ion source.
Description
- 1. Field of the Invention
- The present invention relates to a gasifier structure and, more particularly, to a gasifier which prevents the reduction of the total ion source obtained by the ion inplater in the gasifier from continuously gasifying the solid ion implater in the gasifier.
- 2. Description of the Prior Art
- In all semiconductor devices, an ion implant is very important technology in the transistor structure. In the ion implantation process, the wafer is subjected to impact by the charge ion stream, which is the so-called dopant. When the doping obtains the sufficient energy, the thin film is implanted to a desired depth, thereby changing the property of the material and providing the specific electrical property. The ion implant accurately controls the dopant concentration in the doping area. The dopant solution (the dose) is controlled by the ion stream current (the total ion amount in the ion stream) and the scanning ratio (the times which the wafer passes through the ion stream). The depth of the dopant is determined by the energy magnitude of the ion stream.
- However, the ion source in the ion stream is generally obtained from the solid ion source gasified in the gasifier. The structure of the conventional gasifier, as shown in
FIGS. 1 and 2 , greatly reduces the total solid source amount in thefurnace 12 as gasifying the solid ion source in thefurnace 12 of the gasifier. Thus phenomenon results in reducing the total gasified ion amount obtained by the ion impanter, In order to maintain a specified doping ion concentration, a manual operation is required to arise the temperature in the gasifier in order to accelerate the subliming speed of the solid ion source or re-adjust the ion stream current. Therefore, the throughput of the ion implater is loss. - In view of the above problems, the present invention provides a gasifier structure to overcome the disadvantages of reducing the solid ion source.
- The present invention provides a gasifier structure, comprising the size of an opening of the furnace less than the size of a bottom of the furnace, representing the narrow top and wide bottom furnace, which prevents the reduction of the ion source obtained by the ion inplater in the gasifier from gasifying the solid ion implater, and which prevents the loss cost and time from the manual operation required to arise the temperature in the gasifier.
- The present invention also provides a gasifier structure, comprising the size of an opening of the furnace less than the size of a bottom of the furnace, representing the narrow top and wide bottom furnace, thereby effectively preventing the greatly increase of the surface area of the solid/gaseous interface from the continuously sublimation of the solid ion source due to the heating, resulting in maintaining a total gasified ion amount obtained by the ion implater, in order to solve the disadvantage of re-adjusting the ion stream current.
- To achieve the aforementioned objects and more, a preferred embodiment of the present invention provides a gasifier structure, comprising a furnace and a heating system, characterized by: the size of an opening of the furnace less than the size of a bottom of the furnace, representing the narrow top and wide bottom furnace.
- These and other objectives of the present invention will become obvious to those of ordinary skill in the art after reading the following detailed description of the preferred embodiment.
- It is to be understood that both the foregoing general description and the following detailed description are exemplary, and are intended to provide further explanation of the invention as claimed.
- The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention. In the drawings,
-
FIGS. 1 and 2 are cross-sectional views of a gasifier according to the prior art; -
FIG. 3 is a cross-sectional view of a gasifier according to a preferred embodiment of the present invention; and -
FIGS. 4 and 5 are the cross-sectional views of a heating system surrounding around the outer peripheral of the furnace according to a preferred embodiment of the present invention. - Refer to
FIG. 3 , which shows a gasifier of the present invention, comprising the size of an opening less than the size of a bottom of the furnace, representing the narrow top andwide bottom furnace 14. Thefurnace 14 can be a conical shape or angle conical shape, and aheating system 16 is surrounded around the outer peripheral of thefurnace 14. - In order to describe the present invention, a solid ion source with a shorter heating time of
FIG. 4 and a solid ion source with a longer heating time ofFIG. 5 will be respectively described in details hereinafter. - Refer to
FIGS. 4 and 5 , when a heating is performed on thesolid ion source 18 in thefurnace 14 by using theheating system 16 surrounding around the outer peripheral of thefurnace 14, as continuously raising the temperature, a sufficient heat energy is performed to thesolid ion source 18 to jump from the solid energy barrier and the liquid energy barrier, thereby directly subliming to a gaseous status. In this situation, allsolid ion sources 18 in thefurnace 14 are gradually reduced, thereby generating the subliming amount of thesolid ion source 18 inFIG. 4 (defining the force as F1) greatly larger than the subliming amount of thesolid ion source 18 inFIG. 5 (defining the force as F2). At this time, because thesolid ion source 18 is reduced, the solid/gaseous interface of thesolid ion source 18 is designed as the narrow top and wide bottom based on the shape of thefurnace 14, thereby presenting the surface area (defining the surface area as A1) of the solid/gaseous interface as shown inFIG. 4 greatly less than the surface area of the solid/gaseous interface (defining the surface area as A2) as shown inFIG. 5 , that is, A1≦A2. - If the heating time is shorter, as shown in
FIG. 4 , the ion implater obtains the total ion amount which is F1×A1. If the heating time is longer is longer, as shown inFIG. 5 , the ion implater obtains the total ion amount which is F2×A2. At this time, F1×A1≈F2×A2. Since the size of an opening of the furnace is less than a size of a bottom of the furnace, A2 is greatly larger than A1, thereby supplementing a situation which F2 is greatly less than F1. - The present invention provides a gasifier which a furnace structure is represented by the size of the opening less than the size of the bottom, in order to effectively offsetting the greatly sublimation of the solid ion source caused by the furnace having the same width on the top and the bottom due to the sufficient heat energy, and in order to effectively offsetting the greatly reduction of total ion amount obtained by the ion implater as reducing the solid ion source, thereby preventing the re-adjustment of the electron beam from the conventional technology, and preventing the throughput reduction from arising the temperature in the gasifier to obtain an identical total ion amount.
- The embodiment above is only intended to illustrate the present invention; it does not, however, to limit the present invention to the specific embodiment. Accordingly, various modifications and changes may be made without departing from the spirit and scope of the present invention as described in the following claims.
Claims (4)
1. A gasifier, comprising:
a furnace; and
a heating system surrounding around the outer peripheral of the furnace;
characterized by: a size of an opening of the furnace less than a size of a bottom of the furnace.
2. The gasifier of claim 1 , wherein the furnace is shaped of a cone.
3. The gasifier of claim 1 , wherein the furnace is shaped of an angle cone.
4. The gasifier of claim 1 , wherein the heating system is a resistive heating system.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN2004200215414 | 2004-01-04 | ||
CNU2004200215414U CN2687841Y (en) | 2004-04-01 | 2004-04-01 | Vaporization furnace |
Publications (1)
Publication Number | Publication Date |
---|---|
US20050161867A1 true US20050161867A1 (en) | 2005-07-28 |
Family
ID=34669560
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/085,098 Abandoned US20050161867A1 (en) | 2004-01-04 | 2005-03-22 | Gasifier structure |
Country Status (2)
Country | Link |
---|---|
US (1) | US20050161867A1 (en) |
CN (1) | CN2687841Y (en) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4787333A (en) * | 1986-05-02 | 1988-11-29 | Hitachi, Ltd. | Metal vapor generator |
US5855683A (en) * | 1996-07-18 | 1999-01-05 | Korea Institute Of Science And Technology | Thin film deposition apparatus |
US6053981A (en) * | 1998-09-15 | 2000-04-25 | Coherent, Inc. | Effusion cell and method of use in molecular beam epitaxy |
-
2004
- 2004-04-01 CN CNU2004200215414U patent/CN2687841Y/en not_active Expired - Fee Related
-
2005
- 2005-03-22 US US11/085,098 patent/US20050161867A1/en not_active Abandoned
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4787333A (en) * | 1986-05-02 | 1988-11-29 | Hitachi, Ltd. | Metal vapor generator |
US5855683A (en) * | 1996-07-18 | 1999-01-05 | Korea Institute Of Science And Technology | Thin film deposition apparatus |
US6053981A (en) * | 1998-09-15 | 2000-04-25 | Coherent, Inc. | Effusion cell and method of use in molecular beam epitaxy |
Also Published As
Publication number | Publication date |
---|---|
CN2687841Y (en) | 2005-03-23 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: GRACE SEMICONDUCTOR MANUFACTURING CORPORATION, CHI Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:CHIANG, REY-HSING;HUANG, CHEN-TSUNG;REEL/FRAME:015995/0020 Effective date: 20050317 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |