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KR100777365B1 - Method of forming metal wiring - Google Patents

Method of forming metal wiring Download PDF

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KR100777365B1
KR100777365B1 KR1020010030117A KR20010030117A KR100777365B1 KR 100777365 B1 KR100777365 B1 KR 100777365B1 KR 1020010030117 A KR1020010030117 A KR 1020010030117A KR 20010030117 A KR20010030117 A KR 20010030117A KR 100777365 B1 KR100777365 B1 KR 100777365B1
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forming
via hole
oxide film
dielectric constant
low dielectric
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KR20020091441A (en
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김길호
류상욱
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매그나칩 반도체 유한회사
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L21/00Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/70Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
    • H01L21/71Manufacture of specific parts of devices defined in group H01L21/70
    • H01L21/768Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics
    • H01L21/76801Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the dielectrics, e.g. smoothing
    • H01L21/76802Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the dielectrics, e.g. smoothing by forming openings in dielectrics
    • H01L21/76804Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the dielectrics, e.g. smoothing by forming openings in dielectrics by forming tapered via holes
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L21/00Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/02Manufacture or treatment of semiconductor devices or of parts thereof
    • H01L21/04Manufacture 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
    • H01L21/18Manufacture 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
    • H01L21/30Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
    • H01L21/31Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
    • H01L21/3105After-treatment
    • H01L21/311Etching the insulating layers by chemical or physical means
    • H01L21/31105Etching inorganic layers
    • H01L21/31111Etching inorganic layers by chemical means
    • H01L21/31116Etching inorganic layers by chemical means by dry-etching
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L21/00Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/70Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
    • H01L21/71Manufacture of specific parts of devices defined in group H01L21/70
    • H01L21/768Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics
    • H01L21/76838Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics characterised by the formation and the after-treatment of the conductors
    • H01L21/76877Filling of holes, grooves or trenches, e.g. vias, with conductive material

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  • Computer Hardware Design (AREA)
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  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
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  • Microelectronics & Electronic Packaging (AREA)
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  • Inorganic Chemistry (AREA)
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  • Internal Circuitry In Semiconductor Integrated Circuit Devices (AREA)

Abstract

본 발명은 금속배선 형성 방법에 관한 것으로, 특히 저 유전 상수 산화막과 산화막 적층 구조의 층간 절연막을 형성하고 비아홀을 형성하는 공정에 있어서, 상기 저 유전 상수 산화막을 평탄화하고 그 상측에 상기 산화막을 형성한 후 양각 경사를 이루면서 상기 산화막과 저 유전 상수 산화막을 선택 식각하여 비아홀을 형성하므로, 상기 비아홀 측벽에 보우잉(Bowing) 현상의 발생을 방지하여 배선 형성용 금속층으로부터 상기 비아홀의 매립 공정이 양호하므로 소자의 수율 및 신뢰성을 향상시키는 특징이 있다.More particularly, the present invention relates to a method of forming a metal wiring, and more particularly, to a method of forming a metal wiring by forming an interlayer insulating film of a low dielectric constant oxide film and an oxide film lamination structure and forming a via hole by flattening the low dielectric constant oxide film and forming the oxide film thereon Since the oxide film and the low dielectric constant oxide film are selectively etched to form a via hole, the occurrence of a bowing phenomenon on the side wall of the via hole is prevented, and the buried process of the via hole from the metal line for wiring formation is good, And the yield and reliability of the catalyst are improved.

Description

금속배선 형성 방법{Method for forming a metal line}[0001] METHOD FOR FORMING A METAL LINE [0002]

도 1a내지 도 1e는 종래 기술에 따른 금속배선 형성 방법을 나타낸 공정 단면도.FIGS. 1A to 1E are process cross-sectional views illustrating a method for forming a metal wiring according to the prior art.

도 2a내지 도 2e는 본 발명의 실시 예에 따른 금속배선 형성 방법을 나타낸 공정 단면도.FIGS. 2A to 2E are cross-sectional views illustrating a method of forming a metal wiring according to an embodiment of the present invention.

< 도면의 주요 부분에 대한 부호의 설명 >Description of the Related Art

11, 31 : 절연 기판 13, 33 : 제 1 Ti/TiN층11, 31: an insulating substrate 13, 33: a first Ti / TiN layer

15, 35 : 알루미늄층 17,37 : 제 2 Ti/TiN층15, 35: Aluminum layer 17, 37: Second Ti / TiN layer

19, 39 : 저 유전 상수 산화막 21, 41 : 산화막19, 39: low dielectric constant oxide film 21, 41: oxide film

23, 43 : 제 2 감광막 25, 45 : 제 3 Ti/TiN층23, 43: second photosensitive film 25, 45: third Ti / TiN layer

27, 47 : 텅스텐층27, 47: tungsten layer

본 발명은 금속배선 형성 방법에 관한 것으로, 특히 저 유전 상수 산화막을 평탄화하고 그 상측에 상기 산화막을 형성한 후 양각 경사를 이루면서 상기 산화막과 저 유전 상수 산화막을 선택 식각하여 비아홀을 형성하여 소자의 수율 및 신뢰 성을 향상시키는 금속배선 형성 방법에 관한 것이다.More particularly, the present invention relates to a method of forming a metal wiring, and more particularly, to a method of forming a via hole by flattening a low dielectric constant oxide film, forming the oxide film on the low dielectric constant oxide film and selectively etching the oxide film and the low dielectric constant oxide film, And a metal wiring forming method for improving reliability.

현재 반도체 칩(Chip) 제조 공정 중에서 다층 금속 배선 형성 시, RC 지연을 최소화시키기 위해 저 유전 상수 산화막을 사용하고 있다.Currently, a low dielectric constant oxide film is used to minimize the RC delay in the formation of multilayer metal wiring in a semiconductor chip manufacturing process.

종래의 금속배선 형성 방법은 도 1a에서와 같이, 금속배선 콘택홀(도시하지 않음)을 갖는 절연 기판(11) 상에 제 1 Ti/TiN층(13), 알루미늄(Al)층(15), 제 2 Ti/TiN층(17) 및 제 1 감광막을 순차적으로 형성한다.1A, a first Ti / TiN layer 13, an aluminum (Al) layer 15, and a second Ti / TiN layer 15 are formed on an insulating substrate 11 having a metal wiring contact hole (not shown) A second Ti / TiN layer 17 and a first photoresist layer are sequentially formed.

상기 제 1 감광막을 제 1 금속배선이 형성될 부위에만 남도록 선택 노광 및 현상한 후, 상기 선택적으로 노광 및 현상된 제 1 감광막을 마스크로 상기 제 2 Ti/TiN층(17), 상기 알루미늄층(15) 및 제 1 Ti/TiN층(13)을 선택 식각하여 Ti/TiN/Al/Ti/TiN 적층 구조의 제 1 금속배선을 형성한 다음, 상기 제 1 감광막을 제거한다.The first photoresist layer is selectively exposed and developed so that the first photoresist layer is left only on a portion where the first metal wiring is to be formed, and then the second Ti / TiN layer 17, the aluminum layer 15 and the first Ti / TiN layer 13 are selectively etched to form a first metal interconnection of a Ti / TiN / Al / Ti / TiN laminate structure, and then the first photoresist film is removed.

도 1b에서와 같이, 상기 제 1 금속배선을 포함한 절연 기판(11) 상에 저 유전 상수 산화막(19)과 산화막(21)을 순차적으로 형성한다.1B, a low dielectric constant oxide film 19 and an oxide film 21 are sequentially formed on an insulating substrate 11 including the first metal interconnection.

여기서, 상기 저 유전 상수 산화막(19)은 산화막(21)보다 기계적, 화학적으로 약한 구조를 가진다.Here, the low-dielectric constant oxide film 19 is mechanically and chemically weaker than the oxide film 21.

그리고, 화학적 기계 연마 방법을 사용하여 상기 산화막(21)을 평탄화한다.Then, the oxide film 21 is planarized using a chemical mechanical polishing method.

도 1c에서와 같이, 상기 평탄화된 산화막(21) 상에 제 2 감광막(23)을 도포하고, 상기 제 2 감광막(23)을 제 1 금속배선 상측의 비아홀이 형성될 부위에만 제거되도록 선택 노광 및 현상한다.1C, the second photoresist layer 23 is coated on the planarized oxide layer 21, and the second photoresist layer 23 is selectively exposed and removed so that only the via hole on the upper side of the first metal interconnection is removed. Develop.

그리고, 상기 선택적으로 노광 및 현상된 제 2 감광막(23)을 마스크로 상기 산화막(21)과 저 유전 상수 산화막(19)을 선택 식각하여 비아홀을 형성한다.The oxide film 21 and the low dielectric constant oxide film 19 are selectively etched using the selectively exposed and developed second photoresist film 23 as a mask to form a via hole.

여기서 상기 비아홀 형성 공정 시, 상기 저 유전 상수 산화막(19)의 비아홀에 보우잉(Bowing) 현상(A)이 발생된다.Here, in the via hole forming process, a bowing phenomenon (A) is generated in the via hole of the low dielectric constant oxide film (19).

상기 보우잉 현상(A)은 상기 저 유전 상수 산화막(19)이 산화막(21)보다 식각 속도가 빠르기 때문에 발생된다.The bouling phenomenon (A) occurs because the low dielectric constant oxide film (19) is etched faster than the oxide film (21).

즉, 비아홀 형성을 위한 건식각 공정은 비아홀의 방향과 동일한 방향으로 즉 수직한 방향으로 진행되지만 산란에 의해 비아홀의 측면을 식각하기도 하기 때문에, 식각 속도가 빠른 저 유전 상수 산화막(19)이 산화막(21)보다 측면 방향으로 더 빨리 식각되어 보우잉 현상(A)이 발생된다.That is, since the dry etching process for forming the via hole proceeds in the same direction as the via hole, that is, in the vertical direction, but the side surface of the via hole is scattered by scattering, the low dielectric constant oxide film 19, 21), the bending phenomenon (A) is generated.

도 1d에서와 같이, 상기 제 2 감광막(23)을 제거하고, 상기 비아홀을 포함한 전면에 제 3 Ti/TiN층(25)을 형성한다.1D, the second photoresist layer 23 is removed, and a third Ti / TiN layer 25 is formed on the entire surface including the via hole.

여기서 상기 제 3 Ti/TiN층(25)의 형성 공정 시, 상기 보우잉 현상(A)이 발생된 부위에는 상기 제 3 Ti/TiN층(25)의 증착 불량(B)이 발생된다.At this time, in the process of forming the third Ti / TiN layer 25, defective deposition (B) of the third Ti / TiN layer 25 occurs at the site where the bouling phenomenon A occurs.

도 1e에서와 같이, 상기 제 3 Ti/TiN층(25) 상에 제 2 금속배선층인 텅스텐(W)층(27)을 형성한다.1E, a tungsten (W) layer 27, which is a second metal wiring layer, is formed on the third Ti / TiN layer 25.

여기서, 상기 제 3 Ti/TiN층(25)이 비아홀 측벽을 따라 형성되어야만 상기 텅스텐층(27)이 비아홀을 매립하기 때문에, 상기 제 3 Ti/TiN층(25)의 증착 불량(B) 발생으로 상기 텅스텐(W)층(27)은 상기 비아홀을 매립하지 못한 부위(H)가 발생한다.If the third Ti / TiN layer 25 is formed along the side wall of the via hole, the tungsten layer 27 buries the via hole. As a result, the third Ti / TiN layer 25 has a poor deposition (B) The tungsten (W) layer 27 generates a portion H where the via hole can not be buried.

종래의 금속배선 형성 방법은 저 유전 상수 산화막과 산화막 적층 구조의 층 간 절연막을 형성하고 비아홀을 형성하는 공정에 있어서, 상기 저 유전 상수 산화막의 점착성으로 그 증착 두께가 동일하지 않기 때문에 상기 비아홀 형성을 위한 저 유전 상수 산화막과 산화막의 건식각 공정 시 식각 조건에 대한 최적화가 어려워 보우잉 현상이 발생하므로 후속 공정에 있어서 Ti/TiN층의 증착 불량이 발생하고 배선 형성용 금속층으로부터 상기 비아홀의 매립 공정이 불량하게 진행되어 소자의 수율 및 신뢰성이 저하되는 문제점이 있었다.In the conventional metal wiring forming method, since the deposition thickness of the low dielectric constant oxide film is not the same as that of the low dielectric constant oxide film in the process of forming the interlayer insulating film of the low dielectric constant oxide film and the oxide film lamination structure and forming the via hole, The Ti / TiN layer is poorly deposited in the subsequent process, and the buried process of the via hole from the metal layer for forming a wiring line is not performed. And the yield and reliability of the device are deteriorated.

본 발명은 상기의 문제점을 해결하기 위해 안출한 것으로 저 유전 상수 산화막과 산화막 적층 구조의 층간 절연막을 형성하고 비아홀을 형성하는 공정에 있어서, 상기 저 유전 상수 산화막을 평탄화하고 그 상측에 상기 산화막을 형성한 후 양각 경사를 이루면서 상기 산화막과 저 유전 상수 산화막을 선택 식각하여 비아홀을 형성하므로 상기 비아홀 측벽에 보우잉 현상의 발생을 방지하는 금속배선 형성 방법을 제공하는데 그 목적이 있다.SUMMARY OF THE INVENTION The present invention has been conceived to solve the problems described above, and it is an object of the present invention to provide a method of forming a via hole by forming an interlayer insulating film of a low dielectric constant oxide film and an oxide film lamination structure, And forming a via hole by selectively etching the oxide film and the low dielectric constant oxide film while forming a positive inclination, thereby preventing the occurrence of a bouling phenomenon on the side wall of the via hole.

본 발명의 금속배선 형성 방법은 제 1 금속배선 패턴이 형성된 절연 기판 상에 저 유전 상수 절연막을 형성하는 단계, 상기 저 유전 상수 절연막을 평탄화하는 단계, 상기 평탄화된 저 유전 상수 절연막 상에 제 2 절연막을 형성하는 단계, 상기 제 1 금속배선 패턴 상측의 제 2 절연막과 저 유전 상수 절연막을 선택 식각하여 비아홀을 형성하는 단계 및 상기 비아홀을 포함한 전면에 확산 방지막과 금속층을 순차적으로 형성하여 상기 비아홀을 매립하면서 제 2 금속배선을 형성하는 단계 를 포함하여 이루어짐을 특징으로 한다.The metal wiring forming method of the present invention includes the steps of forming a low dielectric constant insulating film on an insulating substrate on which a first metal wiring pattern is formed, planarizing the low dielectric constant insulating film, forming a second insulating film on the planarized low dielectric constant insulating film, Forming a via hole by selectively etching a second insulating film and a low dielectric constant insulating film on the first metal wiring pattern; and forming a diffusion barrier film and a metal layer on the entire surface including the via hole, And forming a second metal interconnection.

상기와 같은 본 발명에 따른 금속배선 형성 방법의 바람직한 실시 예를 첨부된 도면을 참조하여 상세히 설명하면 다음과 같다.FIG. 2 is a cross-sectional view illustrating a metal wiring forming method according to an embodiment of the present invention; FIG.

도 2a내지 도 2e는 본 발명의 실시 예에 따른 금속배선 형성 방법을 나타낸 공정 단면도이다.2A to 2E are cross-sectional views illustrating a method of forming a metal line according to an embodiment of the present invention.

본 발명의 실시 예에 따른 금속배선 형성 방법은 도 2a에서와 같이, 금속배선 콘택홀(도시하지 않음)을 갖는 절연 기판(31) 상에 제 1 Ti/TiN층(33), 알루미늄층(35), 제 2 Ti/TiN층(37) 및 제 1 감광막을 순차적으로 형성한다.The method of forming a metal line according to an embodiment of the present invention includes forming a first Ti / TiN layer 33, an aluminum layer 35 (not shown) on an insulating substrate 31 having a metal wiring contact hole (not shown) ), A second Ti / TiN layer 37 and a first photoresist layer are sequentially formed.

상기 제 1 감광막을 제 1 금속배선이 형성될 부위에만 남도록 선택 노광 및 현상한 후, 상기 선택적으로 노광 및 현상된 제 1 감광막을 마스크로 상기 제 2 Ti/TiN층(37), 상기 알루미늄층(35) 및 제 1 Ti/TiN층(33)을 선택 식각하여 Ti/TiN/Al/Ti/TiN 적층 구조의 제 1 금속배선을 형성한 다음, 상기 제 1 감광막을 제거한다.After selectively exposing and developing the first photoresist layer so that the first photoresist layer remains only on a portion where the first metal wiring is to be formed, the second Ti / TiN layer 37, the aluminum layer 35 and the first Ti / TiN layer 33 are selectively etched to form a first metal interconnection of a Ti / TiN / Al / Ti / TiN laminate structure, and then the first photoresist film is removed.

그리고, 상기 제 1 금속배선을 포함한 절연 기판(31) 상에 저 유전 상수 산화막(39)을 회전 도포 방식으로 형성한다.Then, a low-dielectric constant oxide film 39 is formed on the insulating substrate 31 including the first metal interconnection by spin coating.

도 2b에서와 같이, 상기 저 유전 상수 산화막(39)을 화학적 기계 연마 방법으로 전면 식각하여 평탄화하면서 상기 저 유전 상수 산화막(39)의 잔존 두께를 조절한다.As shown in FIG. 2B, the low dielectric constant oxide film 39 is planarized by frontal etching using a chemical mechanical polishing method, and the remaining thickness of the low dielectric constant oxide film 39 is adjusted.

여기서, 상기 평탄화된 저 유전 상수 산화막(39)의 두께는 후속 공정에서 형성될 비아홀 내부에 텅스텐층이 잘 채워지는 두께의 최대 값보다 작게 한다. Here, the thickness of the planarized low-k dielectric oxide film 39 is smaller than the maximum thickness of the tungsten layer in the via hole to be formed in the subsequent process.                     

즉, 상기 평탄화된 저 유전 상수 산화막(39)의 두께가 높으면 상기 저 유전 상수 산화막(39)에서 외부로 발산되는 기체 성분 때문에 후속 공정의 제 3 Ti/TiN층/텅스텐층 증착 공정에서 문제가 발생하고, 그 반대로 상기 평탄화된 저 유전 상수 산화막(39)의 두께가 낮으면 층간절연막 전체의 유전 상수가 너무 높아져 RC 지연이 발생한다.That is, if the thickness of the planarized low-k dielectric oxide film 39 is high, there is a problem in the third Ti / TiN / tungsten layer deposition process of the subsequent process owing to the gas component diffusing out from the low-k dielectric oxide film 39 On the other hand, if the thickness of the planarized low-k dielectric oxide film 39 is low, the dielectric constant of the entire interlayer insulating film becomes too high, and an RC delay occurs.

도 2c에서와 같이, 상기 평탄화된 저 유전 상수 산화막(39) 상에 산화막(41)을 피이시브이디(Plasma Enhanced Chemical Vapor Deposition : PECVD) 방식으로 형성한다.As shown in FIG. 2C, an oxide film 41 is formed on the planarized low-k dielectric oxide film 39 by a plasma enhanced chemical vapor deposition (PECVD) method.

여기서, 상기 저 유전 상수 산화막(39)은 산화막(41)보다 기계적, 화학적으로 약한 구조를 가진다.Here, the low-dielectric constant oxide film 39 is mechanically and chemically weaker than the oxide film 41.

도 2d에서와 같이, 상기 산화막(41) 상에 제 2 감광막(43)을 도포하고, 상기 제 2 감광막(43)을 제 1 금속배선 상측의 비아홀이 형성될 부위에만 제거되도록 선택 노광 및 현상한다.2D, a second photoresist layer 43 is coated on the oxide layer 41, and the second photoresist layer 43 is selectively exposed and developed so as to be removed only at a portion where a via hole on the upper side of the first metal interconnection is to be formed .

그리고, 상기 선택적으로 노광 및 현상된 제 2 감광막(43)을 마스크로 상기 산화막(41)과 저 유전 상수 산화막(39)을 선택 식각하여 비아홀을 형성한다.The oxide film 41 and the low dielectric constant oxide film 39 are selectively etched using the selectively exposed and developed second photoresist film 43 as a mask to form a via hole.

여기서 상기 비아홀 형성 공정 시, 비아홀의 방향과 동일한 방향 즉 수직한 방향으로 진행되도록 제 1 플라즈마(Plasma) 활성 조건을 설정하여 상기 산화막(41)을 식각하고, 상기 저 유전 상수 산화막(39)을 식각할 직전부터는 양각 경사를 이루면서 비아홀을 형성할 수 있도록 즉 비아홀 측벽에 다량의 폴리머(Polymer)를 증착시켜 비아홀 측벽을 보호하면서 식각하도록 제 2 플라즈마 활성 조건을 설정하여 상기 산화막(41)과 저 유전 상수 산화막(39)을 식각한다.Here, in the via hole forming process, the oxide film 41 is etched by setting a first plasma activation condition so as to proceed in the same direction as the via hole direction, that is, in the vertical direction. Then, the low dielectric constant oxide film 39 is etched A large amount of polymer is deposited on the side wall of the via hole so as to form a via hole with a positive inclination so that the second plasma activating condition is set so as to protect the via hole sidewall while protecting the via hole side wall, The oxide film 39 is etched.

이때, 상기 저 유전 상수 산화막(39)을 평탄화 시켰기 때문에 상기 양각 경사를 이루면서 비아홀을 형성할 수 있도록 플라즈마 활성 조건의 전환이 가능하다.At this time, since the low dielectric constant oxide film 39 is planarized, the plasma activation condition can be changed so that the via hole can be formed with the inclined inclination.

그리고, 상기 플라즈마 활성 조건의 전환을 상기 저 유전 상수 산화막(39)과 산화막(41) 사이의 경계면이 아닌, 그 경계면의 약간 위에서 실시하는 이유는 활성 조건의 변화를 경계면의 약간 위에서 미리 실시함으로써 상기 비아홀의 측벽 표면이 부드러운 곡면을 유지할 수 있기 때문이다.The reason why the plasma activation conditions are switched on the interface rather than the interface between the low dielectric constant oxide film 39 and the oxide film 41 is that the change of the activation condition is carried out slightly before the interface, This is because the side wall surface of the via hole can maintain a smooth curved surface.

또한, 상기 양각 경사를 이루면서 비아홀을 형성할 수 있는 제 2 플라즈마 활성 조건은 먼저 산화막 식각 시 사용하는 CxFy기체를 활성화시킨 플라즈마에서 y값에 대한 x값의 비율을 높여 양각 경사를 만들 수 있다.Also, the second plasma activation condition that can form the above-mentioned positive inclination while forming the via hole is to increase the ratio of x value to the y value in the plasma in which the C x F y gas used in the oxide etching process is activated, have.

그리고, 수소(H)성분은 폴리머 형성을 촉진하는 경향이 있기 때문에 상기 CxFy기체에 CiHjFk를 첨가하여 플라즈마를 활성화시키면 양각 경사를 이루면서 상기 비아홀의 측벽이 식각되는 것을 방지할 수 있고, 또한 산소(O) 성분은 폴리머 형성을 방해하는 경향이 있어 상기 CxFy기체에 O2를 첨가하여 수직 방향으로 식각이 이루어지도록 플라즈마 활성 조건을 설정한 후 다른 변수들을 고정 시킨 상태에서 첨가된 O2를 줄이면 양각 경사를 갖는 비아홀을 형성할 수 있다.Since the hydrogen (H) component tends to promote polymer formation, when the plasma is activated by adding C i H j F k to the C x F y gas, the sidewall of the via hole is prevented from being etched, And the oxygen (O) component tends to interfere with the polymer formation, so that the plasma activity condition is set so that O 2 is added to the C x F y gas to perform etching in the vertical direction, and then other parameters are fixed reducing the O 2 was added in the state it is possible to form a via hole having an embossed inclined.

상술한 상기 양각 경사를 이루면서 비아홀을 형성할 수 있는 제 2 플라즈마 활성 조건들을 두 가지 이상의 방식을 동시에 사용하여 진행할 수도 있다.The second plasma activation conditions capable of forming a via hole while forming the above-mentioned positive inclination may be performed using two or more methods at the same time.

도 2e에서와 같이, 상기 제 2 감광막(43)을 제거하고, 상기 비아홀을 포함한 전면에 제 3 Ti/TiN층(45)과 텅스텐층(47)을 순차적으로 형성하여 상기 비아홀을 매립하면서 제 2 금속배선을 형성한다.2E, the second photoresist layer 43 is removed and a third Ti / TiN layer 45 and a tungsten layer 47 are sequentially formed on the entire surface including the via hole to fill the via hole, Thereby forming a metal wiring.

본 발명의 금속배선 형성 방법은 저 유전 상수 산화막과 산화막 적층 구조의 층간 절연막을 형성하고 비아홀을 형성하는 공정에 있어서, 상기 저 유전 상수 산화막을 평탄화하고 그 상측에 상기 산화막을 형성한 후 양각 경사를 이루면서 상기 산화막과 저 유전 상수 산화막을 선택 식각하여 비아홀을 형성하므로, 상기 비아홀 측벽에 보우잉 현상의 발생을 방지하여 배선 형성용 금속층으로부터 상기 비아홀의 매립 공정이 양호하므로 소자의 수율 및 신뢰성을 향상시키는 효과가 있다.The metal wiring forming method of the present invention is a method of forming a low dielectric constant oxide film and an interlayer insulating film of an oxide film lamination structure and forming a via hole in the process of forming a low dielectric constant oxide film by forming an oxide film on the low dielectric constant oxide film, The via hole is formed by selectively etching the oxide film and the low dielectric constant oxide film to prevent the occurrence of a bouling phenomenon on the side wall of the via hole and to improve the yield and reliability of the device due to the good filling process of the via hole from the metal layer for wiring formation It is effective.

Claims (6)

삭제delete 삭제delete 제 1 금속배선 패턴이 형성된 절연 기판 상에 저 유전 상수 절연막을 형성하는 단계;Forming a low dielectric constant insulating film on an insulating substrate on which a first metal wiring pattern is formed; 상기 저 유전 상수 절연막을 평탄화하는 단계;Planarizing the low dielectric constant insulating film; 상기 평탄화된 저 유전 상수 절연막 상에 제 2 절연막을 형성하는 단계;Forming a second insulating layer on the planarized low-k dielectric insulating layer; 상기 제 1 금속배선 패턴 상측의 제 2 절연막과 저 유전 상수 절연막을 선택 식각하며, 제 1 플라즈마 활성 조건을 설정하여 상기 제 2 절연막을 식각하고, 상기 저 유전 상수 절연막을 식각하기 직전부터는 양각 경사를 이루면서 비아홀을 형성하는 제 2 플라즈마 활성 조건을 설정하여 상기 제 2 절연막과 저 유전 상수 절연막을 식각하여 비아홀을 형성하는 단계;The second insulating film and the low dielectric constant insulating film on the upper side of the first metal wiring pattern are selectively etched to set the first plasma activation condition to etch the second insulating film, Forming a via hole by etching the second insulating film and the low dielectric constant insulating film by setting a second plasma activation condition to form a via hole; 상기 비아홀을 포함한 전면에 확산 방지막과 금속층을 순차적으로 형성하여 상기 비아홀을 매립하면서 제 2 금속배선을 형성하는 단계를 포함하여 이루어짐을 특징으로 하는 금속배선 형성 방법.Forming a diffusion barrier layer and a metal layer on the entire surface including the via hole, and forming a second metal wiring while filling the via hole. 제 3 항에 있어서,The method of claim 3, 상기 양각 경사를 이루면서 비아홀을 형성할 수 있는 제 2 플라즈마 활성 조건은 제 2 절연막 식각 시 사용하는 CxFy기체를 활성화시킨 플라즈마에서 y값에 대한 x값의 비율을 높임을 특징으로 하는 금속배선 형성 방법.Wherein the second plasma activation condition capable of forming a via hole with a positive inclination is to increase the ratio of x value to y value in a plasma in which C x F y gas used for etching the second insulating film is activated, / RTI &gt; 제 3 항에 있어서,The method of claim 3, 상기 양각 경사를 이루면서 비아홀을 형성할 수 있는 제 2 플라즈마 활성 조건은 CxFy기체에 CiHjFk를 첨가함을 특징으로 하는 금속배선 형성 방법.Wherein the second plasma activation condition capable of forming the via hole with the relief inclination is that C i H j F k is added to C x F y gas. 제 3 항에 있어서,The method of claim 3, 상기 양각 경사를 이루면서 비아홀을 형성할 수 있는 제 2 플라즈마 활성 조건은 CxFy기체에 O2를 첨가하여 수직 방향으로 식각이 이루어지도록 플라즈마 활성 조건을 설정한 후 다른 변수들을 고정시킨 상태에서 첨가된 O2를 줄임을 특징으로 하는 금속배선 형성 방법.The second plasma activation condition which can form a via hole with the inclined inclination is performed by setting the plasma activation condition so that O 2 is added to the C x F y gas to perform etching in the vertical direction, the metal wire forming method, characterized by decreasing the O 2.
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR970003515A (en) * 1995-06-30 1997-01-28 김주용 Via contact formation method of semiconductor device
KR19980020842A (en) * 1996-09-12 1998-06-25 문정환 How to Form Metal Wiring
KR19980029055A (en) * 1996-10-25 1998-07-15 김영환 Via hole formation method of semiconductor device
KR19990011520A (en) * 1997-07-24 1999-02-18 윤종용 Wiring Structure of Semiconductor Device and Manufacturing Method Thereof

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR970003515A (en) * 1995-06-30 1997-01-28 김주용 Via contact formation method of semiconductor device
KR19980020842A (en) * 1996-09-12 1998-06-25 문정환 How to Form Metal Wiring
KR19980029055A (en) * 1996-10-25 1998-07-15 김영환 Via hole formation method of semiconductor device
KR19990011520A (en) * 1997-07-24 1999-02-18 윤종용 Wiring Structure of Semiconductor Device and Manufacturing Method Thereof

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