EP1435108A1 - Reacteur a plasma concu pour la production de composants electroniques - Google Patents

Reacteur a plasma concu pour la production de composants electroniques

Info

Publication number
EP1435108A1
EP1435108A1 EP02746173A EP02746173A EP1435108A1 EP 1435108 A1 EP1435108 A1 EP 1435108A1 EP 02746173 A EP02746173 A EP 02746173A EP 02746173 A EP02746173 A EP 02746173A EP 1435108 A1 EP1435108 A1 EP 1435108A1
Authority
EP
European Patent Office
Prior art keywords
reactor
gas
plate
gas spraying
wafer
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.)
Withdrawn
Application number
EP02746173A
Other languages
German (de)
English (en)
Inventor
designation of the inventor has not yet been filed The
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ANS Co Ltd
Original Assignee
Bae Kyung-Bin
Park Hee-Kook
ANS Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Bae Kyung-Bin, Park Hee-Kook, ANS Co Ltd filed Critical Bae Kyung-Bin
Publication of EP1435108A1 publication Critical patent/EP1435108A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
    • H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
    • H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
    • H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
    • H01L21/302—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to change their surface-physical characteristics or shape, e.g. etching, polishing, cutting
    • H01L21/306—Chemical or electrical treatment, e.g. electrolytic etching
    • H01L21/3065—Plasma etching; Reactive-ion etching
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H1/00—Generating plasma; Handling plasma
    • H05H1/24—Generating plasma
    • H05H1/46—Generating plasma using applied electromagnetic fields, e.g. high frequency or microwave energy
    • 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
    • H01J37/32431—Constructional details of the reactor
    • H01J37/32458—Vessel
    • H01J37/32522—Temperature
    • 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
    • H01J37/32431—Constructional details of the reactor
    • H01J37/32623—Mechanical discharge control means
    • 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
    • H01J37/32431—Constructional details of the reactor
    • H01J37/3266—Magnetic control means

Definitions

  • the present invention relates to a plasma reactor for processing a wafer type material, and in particular to a plasma reactor which is capable of etching a certain material such as a semiconductor wafer and overcoming an unbalance of a plasma ion concentration in a center and edge portion of a wafer.
  • FIG. 1A is a view illustrating a conventional plasma reactor for etching a wafer.
  • a reactor 3 in a reactive ion plasma reactor formed of two electrodes of a parallel flat plate structure, a reactor 3 includes a susceptor 5 which supports a wafer 4, and a distanced upper electrode 1.
  • a main reaction gas and a mixing gas are sprayed through a gas spray plate 2.
  • the susceptor 5 and the gas spraying plate 2 may be used as an electrode.
  • Figure 1 B is a view illustrating a gas injection unit formed of an upper electrode 1 and a gas spraying plate 2.
  • a main reaction gas and a mixing gas are injected through gas injection ports 6g and 7g and pass through a gas mixing path 4g and are mixed therein.
  • the mixed gas is injected into a reactor 3 through a gas spraying plate 2 and a gas spraying port 5g.
  • Figure 2A is a view illustrating a method for forming a magnetic field in a plasma reactor.
  • a plurality of permanent magnets 15 are installed in a circumferential portion of the reactor 13.
  • Each permanent magnet has the same polarity as a neighboring permanent magnet, and each magnet has a uniform magnetic field direction. The sum of the entire magnetic fields is adjusted to pass a wafer surface in parallel.
  • a permanent magnet array may be forcibly rotated at a uniform speed by a motor 11 , so that a concentration and etching ratio of a plasma on a wafer are uniform in a reactor.
  • Figure 2B is a view illustrating another method for forming a magnetic field in a plasma reactor.
  • two pairs of large coils are installed in a circumferential portion of the reactor, so that magnetic fields Bx and By formed by the pairs of the coils pass through a surface of the wafer.
  • the sum B of the magnetic fields are adjusted by the size of the CD current, so that it is possible to implement a certain rotation based on a uniform speed and phase on the wafer. It is performed that each oil 1', 2', 3' and 4' is driven by each power driver 5', 6', T, and 8', so that a uniform plasma concentration on the wafer is obtained based on a DC magnetic field.
  • a plasma reactor which includes a coil array unit along a circumferential surface of a reactor for improving a non-uniformity of a plasma ion concentration and a water etching ratio between a center portion and edge portion of a wafer.
  • a magnetic coil array unit is driven by a series connected single power driver.
  • An AC or pulse signal may be used as a single power driver.
  • a magnetic coil array unit a plurality of support members on which a coil is wound are installed along an outer circumferential surface of a reactor, and then a coil is wound on each support member by a certain number.
  • Each magnetic coil is connected in series in such a manner that the coils connected to a neighboring support member have opposite polarities.
  • the coils are wound a multiple layer structure and are arranged crossingly each other, so that a distribution of a magnetic field is adjusted based on a crossing area ratio.
  • the magnetic coil array unit preferably includes a cooling apparatus for cooling heat which generates in a magnetic coil.
  • the above cooling apparatus includes a cooling water pipe inserted into a circumferential portion of a magnetic coil array unit for thereby circulating a cooling water or coolant.
  • a gas injection unit includes a gas spraying plate through which a gas is sprayed.
  • the gas spraying plate includes a separate gas spraying port in such a manner that a main reaction gas and mixing gas are sprayed through different paths.
  • the gas spraying plate is formed of a center plate of a center portion and an outer plate of an edge portion.
  • the gas spraying port is formed in such a manner that the main reaction gas is sprayed to a center plate, and the mixing gas is sprayed to the outer plate.
  • the gas spraying plate is inclined in a boundary portion between the center plate and the outer plate, and the outer plate is thicker compared to the center plate.
  • the gas spraying port may be formed in the inclined portion at a certain inclined angle.
  • the gas spraying port is formed in a center portion of the gas spraying plate based on a less densely method, and the gas spraying port is formed more densely in the direction of the edge portion of the same.
  • Figure 1A is a schematic cross-sectional view illustrating a conventional plasma reactor
  • Figure 1 B is a cross-sectional view illustrating a gas injection portion of a conventional plasma reactor
  • Figure 1 C is a plan view illustrating a gas spraying plate of a conventional plasma reactor
  • Figure 2A is a view illustrating a conventional plasma reactor in which a magnetic field of a double polar ring magnet is formed
  • Figure 2B is a view illustrating a conventional plasma reactor in which a magnetic field of a magnetic coil is formed
  • Figure 3 is a view illustrating a distribution of a plasma ion concentration of a conventional plasma reactor
  • Figure 4A is a schematic cross sectional view illustrating a plasma reactor according to the present invention.
  • Figure 4B is a perspective view illustrating a plasma reactor according to the present invention.
  • Figures 5A and 5B are views illustrating a magnetic coil installation and a connection method of a magnetic coil according to the present invention
  • Figures 5C, 5D and 5E are schematic views illustrating a magnetic characteristic based on a magnetic coil installation and a controller according to an embodiment of the present invention
  • Figures 6A and 6B are views illustrating another embodiment of a coil installation method according to the present invention.
  • Figures 7A and 7B are views illustrating further another embodiment of a coil installation method according to the present invention.
  • Figure 8 is a cross-sectional view illustrating a gas injection portion according to an embodiment of the present invention
  • Figures 9A and 9B are schematic views illustrating a gas spraying plate according to an embodiment of the present invention.
  • Figures 10A and 10B are schematic views illustrating an installation method of a spraying port of a gas spraying plate of a center portion according to an embodiment of the present invention.
  • Figure 11 is a view illustrating a distribution of a plasma ion concentration of an apparatus according to the present invention. Best Mode for Carrying Out the Invention
  • Figure 4A is a cross-sectional view according to an embodiment of the present invention
  • Figure 4B is a perspective view of the same
  • Figure 5A is a view illustrating a detailed construction of a magnetic coil array unit according to an embodiment of the present invention.
  • a magnetic coil array unit 47 is installed in an outer circumferential surface of a reactor 43 for decreasing electrons which are moved to an inner wall of the reactor 43, and enhancing a plasma ion concentration in an edge portion of a wafer 44.
  • each magnetic coil is connected in series and is driven by one controller(power drive).
  • the above construction of the magnetic coil is not limited thereto.
  • the magnetic coils may be driven by winding in such a manner that neighboring magnetic coils vibrate.
  • the value of g may be adjusted so that a region in which electrons are confined between two neighboring magnetic coils is positioned in an edge portion of the wafer 44 based on the size of the current applied to each coil. Therefore, the plasma ionization in the above portion is increased by the active electrons in the above region.
  • the magnetic coil array unit 47 may be driven, so that the magnetic coil array unit 47 is vibrated at a certain period and size at a high speed along an inner wall of the reactor 43 and an edge portion of the wafer 44 based on a driving method of the magnetic coil array unit 47, so that the plasma ion concentration in the side of the edge portion of the wafer 44 is increased, and the non-uniformity of the etching ratio is overcome.
  • Figure 5E the above results may be obtained in such a manner that a current is sequentially applied to each magnetic coil by a single power driver based on an AC current or pulse signal. In this case, all coils are connected in series, so that the construction of a driving circuit is simplified.
  • FIG. 5B is a view illustrating a magnetic coil array unit in which the cooling water pipe 50 is installed in the interior of the same.
  • Figures 6A and 7A are views illustrating another embodiment of a method for winding a coil on a magnetic coil array unit 47.
  • a plurality of support members 47 on which a coil is wound are installed, and a coil is wound on two neighboring support members in upper and lower directions in a two layer structure. Therefore, in this embodiment, neighboring coils of each layer are installed to have opposite polarities, and the coils 1 , 2, 3, 4, 5 and 6 of the upper layer are installed in the direction of the wafer, and the coils a, b, c, d, e and f of the lower layer are installed in the side of the inner wall of the reactor.
  • the winding sequence of the coils is 1-a-2-b-3-c-4-d-5-e- 6-f.
  • the intensity of the magnetic field is not limited to the coils wound on the neighboring support member, so that a magnetic force line is widely distributed for thereby affecting the coils installed in two neighboring support members.
  • FIGS 7A and 7B are views illustrating a magnetic coil array unit 47 according to further another embodiment of the present invention.
  • a plurality of support members 49 are installed for thereby winding coils thereonto.
  • the coils formed in a two-layer structure are installed crossingly in an upper and lower direction in three neighboring support members.
  • the coils V, 2', 3' and 4' of the upper layer and the coils a', b', c', and d' of the lower layer are installed in the side of each wafer and the side of the inner wall of the reactor in such a manner that neighboring coils of each layer has opposite polarities.
  • the winding sequence of the coils is I'-a'- ⁇ '-b'-S'-c'- ⁇ -d'.
  • FIG 7B in the case of the magnetic field distribution in the interior of the interior, there are relatively large polarities of N and S.
  • the direction and range of the magnetic field in the interior of the reactor are distributed in an inner portion of the inner wall of the reactor and an edge portion of the wafer by the above polarities.
  • the active electron region is widely formed based on the distribution of the magnetic force line.
  • Figure 8 is a cross sectional view illustrating a gas injection unit based on a preferred embodiment of the present invention.
  • the embodiment of Figure 8 is directed to maximizing the uniformity of the plasma ion concentration which is an object of the present invention.
  • a main reaction gas and mixing gas are injected through the gas injection unit.
  • the conventional plasma reactor as shown in
  • a gas spraying plate is improved.
  • a main reaction gas is sprayed to a center portion of the reactor 43 through the main reaction gas injection port 6g, and a mixing gas is sprayed to an inner side of an inner wall of the reactor and an edge portion of the wafer through the mixing gas injection port 7g, so that the mixing gas is fast spread in the direction of the center portion of the wafer based on a fast electron activation region of the edge portion of the wafer.
  • the mixing gas is reacted more uniformly compared to the main reaction gas in the center portion of the wafer.
  • the gas spraying plate 42 is formed of a center plate 2R and an outer plate 2M.
  • the main reaction gas is sprayed through the center plate 2R, and the mixing gas is sprayed through the outer plate 2M.
  • a certain step formed at a certain angle is formed in a portion of the outer plate 2M which contacts with the center plate 2R, so that the mixing gas is more efficiently mixed with the main reaction gas in a lower portion of the center plate 2R.
  • one center plate 2R is formed.
  • the spraying port may be formed in such a manner that the gas is injected into two regions, and the regions of the center plate 2R may be divided into multiple plate regions with respect to the co- axis of the center plate 2R, so that different main reaction gases of different kinds are sprayed.
  • a certain method may be adapted. Namely, in the above new method, the number of the spraying ports is small in the center portion, and the number of the spraying ports is gradually increased in the direction of the edge portion. Therefore, the distance between the upper electrode and the wafer is decreased, and the effect of the operation is significantly increased based on the above method.
  • the present invention is used for an oxide film etching operation.
  • the main reaction gas there are CF, CHF, NF and SF gases.
  • the mixing gas there are He, Ar, O 2 , H 2 , CO2, etc.
  • the HE ions injected into an edge portion of the reactor are fully accelerated based on an electron active layer and are dynamically reacted with the ions of CxFy and CxHyFz. Therefore, it is possible to significantly increase the ion concentration of the center portion of the wafer of the interior of the reactor and the edge portion of the wafer and the uniformity of the etching ratio.
  • Figure 11 is a view illustrating a region B in which the plasma concentration of the wafer and etching ratio are improved based on the mixing gas fast spread by the active electron layer.
  • An active electron layer which is fast vibrated at a high speed is formed in left and right portions of the edge portion of the wafer in such a manner that the polarities are different in the neighboring coils, and a plurality of coils are connected in series.
  • the mixing gas is fast spread by changing the structure of the gas spraying plate, so that the ion concentration of the plasma ion in the center portion of the wafer and edge portion and the non- uniformity problem of the etching ratio are improved.
  • the magnetic coil array unit is driven by a single power driver such as AC or pulse signal, so that the construction of a driving circuit is simplified.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Analytical Chemistry (AREA)
  • Chemical & Material Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Manufacturing & Machinery (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Power Engineering (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Electromagnetism (AREA)
  • Drying Of Semiconductors (AREA)
  • Plasma Technology (AREA)

Abstract

L'invention concerne un réacteur à plasma servant à attaquer un matériau tel qu'une tranche de semi-conducteur, ce réacteur devant permettre de résoudre le problème du déséquilibre de la densité d'ions de plasma entre la partie centrale de la tranche et sa partie périphérique. Selon la présente invention, une pluralité de bobines, chacune possédant une polarité différente et étant reliée en série à la bobine adjacente, forme une couche d'électrons actifs qui oscillent autour des bords de ladite tranche à très grande vitesse. La structure modifiée de l'injecteur de gaz permet à des gaz mixtes d'être dispersés rapidement. Ainsi avec ladite invention le problème du déséquilibre du taux de gravure et de la densité des ions de plasma entre la partie centrale de la tranche et sa partie périphérique est résolu. En outre, un ensemble de bobines magnétiques peut être exciter par un seul signal d'attaque tel qu'un courant alternatif ou un signal à impulsions. Par conséquent, la structure d'un circuit d'attaque devient très simple.
EP02746173A 2001-07-09 2002-07-05 Reacteur a plasma concu pour la production de composants electroniques Withdrawn EP1435108A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
KR10-2001-0040786A KR100422488B1 (ko) 2001-07-09 2001-07-09 플라즈마 처리 장치
KR2001040786 2001-07-09
PCT/KR2002/001273 WO2003007358A1 (fr) 2001-07-09 2002-07-05 Reacteur a plasma concu pour la production de composants electroniques

Publications (1)

Publication Number Publication Date
EP1435108A1 true EP1435108A1 (fr) 2004-07-07

Family

ID=19711936

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02746173A Withdrawn EP1435108A1 (fr) 2001-07-09 2002-07-05 Reacteur a plasma concu pour la production de composants electroniques

Country Status (4)

Country Link
EP (1) EP1435108A1 (fr)
JP (1) JP2004535076A (fr)
KR (1) KR100422488B1 (fr)
WO (1) WO2003007358A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4522783B2 (ja) * 2004-08-03 2010-08-11 株式会社日立ハイテクノロジーズ プラズマ処理装置及びプラズマ処理方法
KR100847007B1 (ko) 2007-05-31 2008-07-17 세메스 주식회사 플라즈마를 이용한 기판 처리 장치 및 방법

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3294839B2 (ja) * 1993-01-12 2002-06-24 東京エレクトロン株式会社 プラズマ処理方法
JP2601127B2 (ja) * 1993-03-04 1997-04-16 日新電機株式会社 プラズマｃｖｄ装置
JP3582287B2 (ja) * 1997-03-26 2004-10-27 株式会社日立製作所 エッチング装置
KR100243446B1 (ko) * 1997-07-19 2000-02-01 김상호 플라즈마 발생부를 가지는 샤워헤드장치
KR19990069564A (ko) * 1998-02-10 1999-09-06 구본준 반도체 웨이퍼 식각공정용 플라즈마 이온가속장치
KR20000025337A (ko) * 1998-10-10 2000-05-06 신현준 마그네트론 스퍼터링에서 타겟에 균일한 자장을인가하는 방법및 장치
KR100354967B1 (ko) * 1999-06-09 2002-10-05 (주)넥소 고밀도 대면적 플라즈마 발생 장치
EP1089319B1 (fr) * 1999-09-29 2009-01-07 European Community Répartition uniforme de gaz dans un appareil de traitement par plasma à grande surface

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO03007358A1 *

Also Published As

Publication number Publication date
KR20030005481A (ko) 2003-01-23
WO2003007358A1 (fr) 2003-01-23
KR100422488B1 (ko) 2004-03-12
JP2004535076A (ja) 2004-11-18

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