US20040250954A1 - Plasma chamber - Google Patents
Plasma chamber Download PDFInfo
- Publication number
- US20040250954A1 US20040250954A1 US10/829,136 US82913604A US2004250954A1 US 20040250954 A1 US20040250954 A1 US 20040250954A1 US 82913604 A US82913604 A US 82913604A US 2004250954 A1 US2004250954 A1 US 2004250954A1
- Authority
- US
- United States
- Prior art keywords
- voltage
- bias
- main
- matching circuit
- plasma chamber
- 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
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/32—Gas-filled discharge tubes
- H01J37/32009—Arrangements for generation of plasma specially adapted for examination or treatment of objects, e.g. plasma sources
- H01J37/32082—Radio frequency generated discharge
- H01J37/32174—Circuits specially adapted for controlling the RF discharge
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/32—Gas-filled discharge tubes
- H01J37/32009—Arrangements for generation of plasma specially adapted for examination or treatment of objects, e.g. plasma sources
- H01J37/32082—Radio frequency generated discharge
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- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Analytical Chemistry (AREA)
- Nonlinear Science (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Drying Of Semiconductors (AREA)
- Plasma Technology (AREA)
Abstract
A plasma chamber comprising a lower electrode and an upper electrode, and used for dry-etching an LCD, comprises a main power supply comprising a main power source to generate a main voltage having a predetermined main frequency, and a first impedance matching circuit to impedance-match the main voltage; a bias power supply comprising a bias power source to generate a bias voltage having a predetermined bias frequency, and a second impedance matching circuit to impedance-match the bias voltage; and a mixer connected to both the first impedance matching circuit and the second impedance matching circuit, receiving and mixing the main voltage and the bias voltage, and outputting the mixed voltage to one of the lower electrode and the upper electrode. With this configuration, the present invention provides a plasma chamber in which etching conditions such as an etching rate, an etching profile, a selection ratio, etc. are precisely adjusted.
Description
- This application claims the benefit of Korean Patent Application No. 2003-38023, filed Jun. 12, 2003, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference.
- 1. Field of the Invention
- The present invention relates to a plasma chamber, and more particularly, to a capacitively coupled plasma (CCP) chamber for dry etching.
- 2. Description of the Related Art
- In a process of manufacturing a liquid crystal display (LCD), a capacitively coupled plasma (CCP) method, an inductively coupled plasma (ICP) method, etc. are being used to form plasma. Particularly, the ICP method that uses an inductive electromagnetic field by generating plasma is widely used because it is possible to form high-density plasma and it is easy to control ion energy by using bias power. On the other hand, the CCP method forms low-density plasma as compared with the ICP method, but is also widely used for etching because it has advantages of a simple equipment, etc.
- FIG. 1 schematically shows a conventional dry etching apparatus using the capacitively coupled plasma.
- As shown in FIG. 1, a
dry etching apparatus 100 comprises aCCP plasma chamber 110, and amain power supply 120. - The
CCP plasma chamber 110 comprises areceptor 111, alower electrode 112 and anupper electrode 113. - The
receptor 111 is placed in an inside lower part of theCCP plasma chamber 110 and supports a panel to which photosensitive material is applied for etching. Thelower electrode 112 contacts a bottom of thereceptor 111 and supplies power to thereceptor 111. Theupper electrode 113 is placed in an inside upper part of theCCP plasma chamber 110 and is grounded as a reference electrode with respect to thelower electrode 112. - The
main power supply 120 comprises amain power source 121 and an impedance matchingcircuit 122. - The
main power source 121 supplies alternating current (AC) power having predetermined frequency and predetermined amplitude, and is connected to thelower electrode 112. Theimpedance matching circuit 122 is electrically connected between thelower electrode 112 and themain power source 121, and prevents the AC power supplied from themain power source 121 from being reversed at thelower electrode 112. - With this configuration, the conventional
dry etching apparatus 100 is operated as follows. - First, a reaction panel is put on the
receptor 111. Then, nearly all gases are evacuated from theCCP plasma chamber 110 by a vacuum pump (not shown) through an exhaust hole (not shown), thereby vacuumizing theCCP plasma chamber 110. Then, a reaction gas is fed into theCCP plasma chamber 110 through an introduce hole (not shown). - After completing preparation for an etching process, the AC power is supplied and the etching process is started.
- When the AC power is supplied to the
lower electrode 112 from themain power source 121, a time-varying electric field is generated between thelower electrode 112 and theupper electrode 113. Such time-varying electric field resolves the reaction gas into an ion, a negative electric charge and a radical. Here, the ion physically collides with and chemically reacts to a thin film of the reaction panel by electric force, and the radical physically collides with and chemically reacts to the thin film of the reaction panel by diffusion, thereby etching the reaction panel. Particularly, in the case of responsive ion etching (IRE), anisotropic etching is performed according to the electric field because the ion is accelerated by the electric field and collides with the thin film. - However, in the conventional
dray etching apparatus 100, a bias electric field for the etching varies according to the amplitude and the frequency of themain power source 121. Thus, there is a limit to precisely control etching conditions such as an etching rate, an etching profile, a selection ratio, etc. - Accordingly, it is an aspect of the present invention to provide a plasma chamber in which etching conditions such as an etching rate, an etching profile, a selection ratio, etc. are precisely adjusted.
- Additional aspects and/or advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
- The foregoing and/or other aspects of the present invention are achieved by providing a plasma chamber comprising a lower electrode and an upper electrode, and used for dry-etching an LCD, comprising: a main power supply comprising a main power source to generate a main voltage having a predetermined main frequency, and a first impedance matching circuit to impedance-match the main voltage; a bias power supply comprising a bias power source to generate a bias voltage having a predetermined bias frequency, and a second impedance matching circuit to impedance-match the bias voltage; and a mixer connected to both the first impedance matching circuit and the second impedance matching circuit, receiving and mixing the main voltage and the bias voltage, and outputting the mixed voltage to one of the lower electrode and the upper electrode.
- According to an aspect of the invention, the plasma chamber further comprises at least one auxiliary power supply comprising an auxiliary power source to generate an auxiliary voltage having a predetermined frequency, and an auxiliary impedance matching circuit to impedance-match the auxiliary voltage, wherein the mixer is connected to the auxiliary impedance matching circuit of the auxiliary power supply, receives and mixes the main voltage, the bias voltage and the auxiliary voltage, and outputs the mixed voltage to one of the lower electrode and the upper electrode.
- According to an aspect of the invention, the mixer outputs the mixed voltage by adding the received voltages.
- According to an aspect of the invention, the bias frequency is lower than the main frequency.
- These and other aspects and advantages of the present invention will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompany drawings of which:
- FIG. 1 is a schematic view of a conventional dry etching apparatus using capacitively coupled plasma; and
- FIG. 2 is a schematic view of a dry etching apparatus using capacitively coupled plasma according to an embodiment of the present invention.
- Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout. The embodiments are described below in order to explain the present invention by referring to the figures.
- FIG. 2 schematically shows a dry etching apparatus using capacitively coupled plasma according to an embodiment of the present invention.
- As shown in FIG. 2, a
dry etching apparatus 1 comprises aCCP plasma chamber 10, and apower supply 20. - The
CCP plasma chamber 10 comprises areceptor 11, alower electrode 12 and anupper electrode 13. Thereceptor 11 is placed in an inside lower part of theCCP plasma chamber 10 and supports a reaction panel to which photosensitive material is applied for etching. Thelower electrode 12 contacts a bottom of thereceptor 11. Theupper electrode 13 is placed in an inside upper part of theCCP plasma chamber 10 and is grounded as a reference electrode with respect to thelower electrode 12. - The
power supply 20 comprises amain power supply 30, abias power supply 40, and amixer 50. - The
main power supply 30 comprises amain power source 31, and a first impedance matchingcircuit 32. Themain power source 31 supplies alternating current (AC) power having a predetermined angular frequency (ω1) and a predetermined amplitude (E1), and is connected to themixer 50. The firstimpedance matching circuit 32 is connected between themixer 50 and themain power source 31, and prevents the AC power supplied from themain power source 31 from being reversed at themixer 50. - The
bias power supply 40 comprises abias power source 41, and a secondimpedance matching circuit 42. Thebias power source 41 supplies alternating current (AC) power having a predetermined angular frequency (ω2) and a predetermined amplitude (E2), and is connected to themixer 50. Here, the lower the frequency is, the heavier a particle reacts the frequency. Therefore, the angular frequency (ω1) of thebias power source 41 causing an ion to collide with the reaction panel is preferably lower than the angular frequency (ω1) of themain power source 31. - The second
impedance matching circuit 42 is connected between themixer 50 and thebias power source 41, and prevents the AC power supplied from thebias power source 41 from being reversed at themixer 50. - The
mixer 50 receives the AC powers from themain power source 31 of themain power supply 30 and thebias power source 41 of thebias power supply 40, respectively, and outputs a predetermined mixed AC power to thelower electrode 12. Themixer 50 is provided to prevent themain power source 31 and thebias power source 41 from being directly connected to thelower electrode 12 to supply mutually AC power to both sources. Herein, themixer 50 mixes the respective AC powers from themain power source 31 and thebias power source 41 by an operation such as addition. In this embodiment, the addition is used for mixing the AC power, but it should be appreciated that other operation is applicable. - A voltage (Vo) outputted from the
mixer 50 to thelower electrode 12 is as follows. - Vo=E 1cos(ω1 t)+E 2cos(ω2 t) <
Equation 1> - In the case where the angular frequency (ω1) of the
main power source 31 is much larger than the angular frequency (ω2) of thebias power source 41, <Equation 1> approximates to the following <Equation 2>. - Vo=E 1 cos (ω1 t)+E 1+(E 2 −E 1) cos (ω2 t), where ω1>>ω2<Equation 2>
- The voltage (Vo) applied to the
lower electrode 12 includes “E1 cos(ω1t)” employed in generating plasma, and “E1+(E2−E1)cos(ω2t)” employed in adjusting etching conditions. - Such voltage for adjusting the etching conditions may be achieved by supplying at least one auxiliary power having a predetermined frequency and a predetermined amplitude, thereby more precisely controlling the etching.
- For example, the
main power supply 30 supplies a main power having a frequency of 13.56 MHz, and separately thebias power supply 40 supplies a bias power having a frequency of several MHz˜several hundred kHz. Here, themixer 50 is employed for preventing a reverse current which may be generated when the powers having the different frequencies from each other are coupled, and for supplying the main power and the bias power at the same time. - With this configuration, the
dry etching apparatus 1 according to an embodiment of the present invention is operated as follows. - First, the reaction panel to which photosensitive material is applied is put on the center of the
receptor 11. Then, theCCP plasma chamber 10 is vacuumized, and a reaction gas is fed into theCCP plasma chamber 10. Then, the reaction gas is changed into the plasma by themain power source 31 and thebias power source 41 of thepower supply 20. Then, the ion is accelerated by the electric field and collides with a thin film of the reaction panel, wherein a part of the thin film to which the photosensitive material is not applied is etched by the ion. - According to an aspect of the invention, the frequency and the amplitude of the bias power can vary to adjust the etching conditions such as an etching rate, an etching profile, a selection ratio, etc., keeping density of the plasma.
- As described above, the present invention provides a plasma chamber in which etching conditions such as an etching rate, an etching profile, a selection ratio, etc. are precisely adjusted.
- Although a few embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. A plasma chamber comprising a lower electrode and an upper electrode, and used for dry-etching an LCD, comprising:
a main power supply comprising a main power source to generate a main voltage having a predetermined main frequency, and a first impedance matching circuit to impedance-match the main voltage;
a bias power supply comprising a bias power source to generate a bias voltage having a predetermined bias frequency, and a second impedance matching circuit to impedance-match the bias voltage; and
a mixer connected to both the first impedance matching circuit and the second impedance matching circuit, receiving and mixing the main voltage and the bias voltage, and outputting the mixed voltage to one of the lower electrode and the upper electrode.
2. The plasma chamber according to claim 1 , further comprising at least one auxiliary power supply comprising an auxiliary power source to generate an auxiliary voltage having a predetermined frequency, and an auxiliary impedance matching circuit to impedance-match the auxiliary voltage, wherein
the mixer is connected to the auxiliary impedance matching circuit of the auxiliary power supply, receives and mixes the main voltage, the bias voltage and the auxiliary voltage, and outputs the mixed voltage to one of the lower electrode and the upper electrode.
3. The plasma chamber according to claim 1 , wherein the mixer outputs the mixed voltage by adding the received voltages.
4. The plasma chamber according to claim 2 , wherein the mixer outputs the mixed voltage by adding the received voltages.
5. The plasma chamber according to claim 1 , wherein the bias frequency is lower than the main frequency.
6. The plasma chamber according to claim 2 , wherein the bias frequency is lower than the main frequency.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR2003-38023 | 2003-06-12 | ||
KR1020030038023A KR100968571B1 (en) | 2003-06-12 | 2003-06-12 | plasma chamber |
Publications (1)
Publication Number | Publication Date |
---|---|
US20040250954A1 true US20040250954A1 (en) | 2004-12-16 |
Family
ID=33509689
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/829,136 Abandoned US20040250954A1 (en) | 2003-06-12 | 2004-04-21 | Plasma chamber |
Country Status (4)
Country | Link |
---|---|
US (1) | US20040250954A1 (en) |
KR (1) | KR100968571B1 (en) |
CN (1) | CN1267769C (en) |
TW (1) | TWI244672B (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20070133919A1 (en) * | 2004-03-10 | 2007-06-14 | Tadahiro Ohmi | Distributor and distributing method, plasma processing system and method, and process for fabricating lcd |
US20090047795A1 (en) * | 2007-08-17 | 2009-02-19 | Tokyo Electron Limited | Plasma processing apparatus, plasma processing method and storage medium |
US20100140221A1 (en) * | 2008-12-09 | 2010-06-10 | Tokyo Electron Limited | Plasma etching apparatus and plasma cleaning method |
CN109216147A (en) * | 2017-06-30 | 2019-01-15 | 三星电子株式会社 | Semiconductor manufacturing apparatus and its operating method |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100777151B1 (en) * | 2006-03-21 | 2007-11-16 | 주식회사 디엠에스 | Hybrid coupled plasma reactor with icp and ccp functions |
CN101478857A (en) * | 2008-01-04 | 2009-07-08 | 北京北方微电子基地设备工艺研究中心有限责任公司 | Plasma treatment apparatus |
Citations (6)
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US6043607A (en) * | 1997-12-16 | 2000-03-28 | Applied Materials, Inc. | Apparatus for exciting a plasma in a semiconductor wafer processing system using a complex RF waveform |
US6309978B1 (en) * | 1998-07-22 | 2001-10-30 | Micron Technology, Inc. | Beat frequency modulation for plasma generation |
US20030037881A1 (en) * | 2001-08-16 | 2003-02-27 | Applied Materials, Inc. | Adjustable dual frequency voltage dividing plasma reactor |
US20030049558A1 (en) * | 2000-12-12 | 2003-03-13 | Makoto Aoki | Vacuum processing method, vacuum processing apparatus, semiconductor device manufacturing method and semiconductor device |
US20030054647A1 (en) * | 1998-09-16 | 2003-03-20 | Tomoki Suemasa | Plasma processing method |
US20030094239A1 (en) * | 2000-06-02 | 2003-05-22 | Quon Bill H. | Apparatus and method for improving electron ecceleration |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3220383B2 (en) * | 1996-07-23 | 2001-10-22 | 東京エレクトロン株式会社 | Plasma processing apparatus and method |
-
2003
- 2003-06-12 KR KR1020030038023A patent/KR100968571B1/en not_active IP Right Cessation
-
2004
- 2004-04-20 TW TW093110954A patent/TWI244672B/en not_active IP Right Cessation
- 2004-04-21 US US10/829,136 patent/US20040250954A1/en not_active Abandoned
- 2004-04-22 CN CNB2004100372015A patent/CN1267769C/en not_active Expired - Fee Related
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6043607A (en) * | 1997-12-16 | 2000-03-28 | Applied Materials, Inc. | Apparatus for exciting a plasma in a semiconductor wafer processing system using a complex RF waveform |
US6309978B1 (en) * | 1998-07-22 | 2001-10-30 | Micron Technology, Inc. | Beat frequency modulation for plasma generation |
US20030054647A1 (en) * | 1998-09-16 | 2003-03-20 | Tomoki Suemasa | Plasma processing method |
US6642149B2 (en) * | 1998-09-16 | 2003-11-04 | Tokyo Electron Limited | Plasma processing method |
US20030094239A1 (en) * | 2000-06-02 | 2003-05-22 | Quon Bill H. | Apparatus and method for improving electron ecceleration |
US20030049558A1 (en) * | 2000-12-12 | 2003-03-13 | Makoto Aoki | Vacuum processing method, vacuum processing apparatus, semiconductor device manufacturing method and semiconductor device |
US6861373B2 (en) * | 2000-12-12 | 2005-03-01 | Canon Kabushiki Kaisha | Vacuum processing method and semiconductor device manufacturing method in which high-frequency powers having mutually different frequencies are applied to at least one electrode |
US20030037881A1 (en) * | 2001-08-16 | 2003-02-27 | Applied Materials, Inc. | Adjustable dual frequency voltage dividing plasma reactor |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20070133919A1 (en) * | 2004-03-10 | 2007-06-14 | Tadahiro Ohmi | Distributor and distributing method, plasma processing system and method, and process for fabricating lcd |
US7582569B2 (en) * | 2004-03-10 | 2009-09-01 | Tokyo Electron Limited | Distributor and distributing method, plasma processing system and method, and process for fabricating LCD |
US20090047795A1 (en) * | 2007-08-17 | 2009-02-19 | Tokyo Electron Limited | Plasma processing apparatus, plasma processing method and storage medium |
US8703002B2 (en) | 2007-08-17 | 2014-04-22 | Tokyo Electron Limited | Plasma processing apparatus, plasma processing method and storage medium |
US20100140221A1 (en) * | 2008-12-09 | 2010-06-10 | Tokyo Electron Limited | Plasma etching apparatus and plasma cleaning method |
US9659756B2 (en) | 2008-12-09 | 2017-05-23 | Tokyo Electron Limited | Plasma etching apparatus and plasma cleaning method |
CN109216147A (en) * | 2017-06-30 | 2019-01-15 | 三星电子株式会社 | Semiconductor manufacturing apparatus and its operating method |
Also Published As
Publication number | Publication date |
---|---|
TWI244672B (en) | 2005-12-01 |
CN1267769C (en) | 2006-08-02 |
KR100968571B1 (en) | 2010-07-08 |
CN1575089A (en) | 2005-02-02 |
KR20040107743A (en) | 2004-12-23 |
TW200428466A (en) | 2004-12-16 |
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Legal Events
Date | Code | Title | Description |
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AS | Assignment |
Owner name: SAMSUNG ELECTRONICS CO., LTD., KOREA, REPUBLIC OF Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:CHOE, HEE-HWAN;KIM, SANG-GAB;KANG, SUNG-CHUL;AND OTHERS;REEL/FRAME:015253/0300 Effective date: 20040409 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |