KR101409543B1 - Sintered AZO formation adding Calcium, sputtering target comprised of the formation, substrate with Calcium containing conduction layer, and method for depositing the layer - Google Patents

Sintered AZO formation adding Calcium, sputtering target comprised of the formation, substrate with Calcium containing conduction layer, and method for depositing the layer Download PDF

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KR101409543B1
KR101409543B1 KR1020120054565A KR20120054565A KR101409543B1 KR 101409543 B1 KR101409543 B1 KR 101409543B1 KR 1020120054565 A KR1020120054565 A KR 1020120054565A KR 20120054565 A KR20120054565 A KR 20120054565A KR 101409543 B1 KR101409543 B1 KR 101409543B1
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calcium
chamber
substrate
azo
target
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KR20130130914A (en
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이상철
안동환
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인베스트세라텍(주)
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    • CCHEMISTRY; METALLURGY
    • C23COATING 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
    • C23CCOATING 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
    • C23C14/00Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/22Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the process of coating
    • C23C14/34Sputtering
    • C23C14/3407Cathode assembly for sputtering apparatus, e.g. Target
    • C23C14/3414Metallurgical or chemical aspects of target preparation, e.g. casting, powder metallurgy
    • CCHEMISTRY; METALLURGY
    • C23COATING 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
    • C23CCOATING 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
    • C23C14/00Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/06Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
    • C23C14/08Oxides
    • C23C14/086Oxides of zinc, germanium, cadmium, indium, tin, thallium or bismuth
    • CCHEMISTRY; METALLURGY
    • C23COATING 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
    • C23CCOATING 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
    • C23C14/00Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/22Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the process of coating
    • C23C14/34Sputtering
    • C23C14/35Sputtering by application of a magnetic field, e.g. magnetron sputtering
    • 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
    • H01L21/02104Forming layers
    • H01L21/02365Forming inorganic semiconducting materials on a substrate
    • H01L21/02612Formation types
    • H01L21/02617Deposition types
    • H01L21/02631Physical deposition at reduced pressure, e.g. MBE, sputtering, evaporation
    • 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 at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer
    • H01L21/18Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic System or AIIIBV compounds with or without impurities, e.g. doping materials
    • H01L21/20Deposition of semiconductor materials on a substrate, e.g. epitaxial growth solid phase epitaxy

Abstract

본 발명은, 기판 표면에 성막되는 도전막의 전기비저항 값이 감소함과 아울러, 도전막의 막 성질을 저하시키는 파티클의 발생을 억제하여 성막 속도를 향상시킬 수 있는, 칼슘 첨가 AZO 소결체와 이를 포함하는 스퍼터링용 타겟, 칼슘 첨가 도전막이 성막된 기판 및 상기 기판의 성막 방법에 관한 것이다.
본 발명에 따른 기판의 성막 방법은, 직류 마그네트론 스퍼터링 장치를 이용하여 기판의 표면에 도전막을 성막하는 기판의 성막 방법에 있어서, 직류 마그네트론 스퍼터링 장치의 기판 홀더와 타겟 홀더를 이용하여 기판과 칼슘 첨가 AZO 타겟을 챔버 내에 배치하는 단계; 챔버의 배기구에 연결된 진공펌프를 구동하여 챔버의 내부압력이 성막 진공도에 도달할 때까지 챔버 내부를 배기하는 단계; 스퍼터링 가스로서 아르곤 가스를 챔버 내에 공급하고 반응촉진 가스로서 수소 가스를 챔버 내에 공급하는 단계; 및 직류 전원의 양극이 연결되는 기판과 음극이 연결되는 칼슘 첨가 AZO 타겟에 전압을 걸어 플라즈마 방전을 일으킴으로써 스퍼터링을 수행하는 단계; 를 포함하여 구성되며, 챔버 내에 공급하는 수소 가스의 도입량은 칼슘 첨가 AZO 타겟에 함유된 칼슘의 함량에 따라 조절되는 것을 특징으로 한다.
The present invention relates to a calcium-added AZO sintered body and a sputtering method including the same, which can reduce an electrical resistivity value of a conductive film formed on a substrate surface and improve a deposition rate by suppressing the generation of particles which lower the film properties of the conductive film. A target having a calcium-containing conductive film formed thereon, and a method for forming the substrate.
A method of depositing a substrate according to the present invention is a method of depositing a conductive film on a surface of a substrate using a DC magnetron sputtering apparatus, comprising the steps of: depositing a substrate and a calcium-added AZO Placing a target in a chamber; Driving a vacuum pump connected to an exhaust port of the chamber to exhaust the inside of the chamber until the internal pressure of the chamber reaches the film vacuum degree; Supplying argon gas as a sputtering gas into the chamber and supplying hydrogen gas as a reaction promoting gas into the chamber; And performing a sputtering by causing a plasma discharge by applying a voltage to a substrate to which a cathode of a DC power source is connected and a calcium-doped AZO target to which a cathode is connected; And the introduction amount of the hydrogen gas to be supplied into the chamber is controlled according to the content of calcium contained in the calcium-added AZO target.

Description

칼슘 첨가 AZO 소결체, 스퍼터링용 타겟, 칼슘 첨가 도전막이 성막된 기판 및 기판의 성막 방법{Sintered AZO formation adding Calcium, sputtering target comprised of the formation, substrate with Calcium containing conduction layer, and method for depositing the layer}BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sintered AZO sintered body, a sputtering target, a substrate on which a calcium-containing conductive film is formed,

본 발명은, 기판상에 성막(成膜)되는 도전막의 전기비저항(resistivity) 값이 감소함과 아울러, 도전막의 막 성질에 악영향을 미치는 파티클의 발생이 억제되어 도전막의 성막 속도가 향상됨은 물론 스퍼터링용 타겟의 사용 수명이 연장 가능한, 칼슘 첨가 AZO(Aluminum doped Zinc Oxide) 소결체와 이를 포함하는 스퍼터링용 타겟, 칼슘 첨가 도전막이 성막된 기판 및 기판의 성막 방법에 관한 것이다.The present invention reduces the electrical resistivity of a conductive film formed on a substrate and suppresses the generation of particles adversely affecting the film properties of the conductive film to thereby improve the film forming rate of the conductive film, (Al) doped Zinc Oxide (sintered) AZO (Aluminum Doped Zinc Oxide) sintered body, a sputtering target containing the same, a substrate on which a calcium-containing conductive film is formed, and a method of forming a substrate.

플라즈마 디스플레이 패널(PDP), 박막 태양 전지(Thin film solar cell) 등은, AZO (Aluminum doped Zinc Oxide) 투명 박막 전극을 이용한다.Plasma display panels (PDP), thin film solar cells and the like use AZO (Aluminum doped Zinc Oxide) transparent thin film electrodes.

AZO 투명 박막 전극은, 화학 기상 증착(Chemical Vapor Deposition:CVD), 원자층 증착(Atomic Layer Deposition:ALD), 스퍼터링(Sputtering) 등에 의해 형성될 수 있는데, 이 중에서도, 특히, 스퍼터링이 박막 형성의 용이성과 대면적 기판에의 적용 용이성 등을 이유로 널리 이용되고 있다.The AZO transparent thin film electrode can be formed by chemical vapor deposition (CVD), atomic layer deposition (ALD), sputtering, or the like. Among them, in particular, And ease of application to a large area substrate.

스퍼터링에 의한 성막(成膜)은, 진공으로 유지되는 챔버 내에 아르곤 가스와 같은 불활성 기체를 스퍼터링 가스로 도입함과 아울러, 목적하는 막 성분을 갖는 원료체(이하, 타겟이라 한다)를 음극으로 하고 기판을 양극으로 하여 이들 사이에 방전을 일으킴으로써, 플라즈마 상태가 된 불활성 기체의 양이온이 음극인 타겟에 충돌하여, 타겟으로부터 막 성분 입자가 떨어져 나와 기판에 퇴적됨으로써 이루어진다.The film formation by sputtering is performed by introducing an inert gas such as argon gas into a chamber maintained in vacuum by a sputtering gas and using a raw material body having a desired film component (hereinafter, referred to as a target) as a cathode By causing a discharge between the substrate and the anode, the positive ions of the inert gas in the plasma state collide with the target, which is the cathode, and the film component particles are separated from the target and deposited on the substrate.

스퍼터링은, 플라즈마를 발생시키는 방식에 따라, 고주파 플라즈마를 이용하는 방식과, 직류 플라즈마를 이용하는 방식으로 나눌 수 있다. 이들 중, 본 발명에 관계되는 직류 플라즈마를 이용하는 방식은, 성막 속도가 빠르고 조작이 간편하다는 이점이 있다.Sputtering can be divided into a method using a high-frequency plasma and a method using a DC plasma according to a method of generating plasma. Among them, the method using the DC plasma according to the present invention has an advantage that the film forming speed is high and the operation is simple.

그러나 산화알루미늄과 산화아연으로만 구성된 종래의 AZO 타겟을 이용한 직류 플라즈마 스퍼터링에서는, 성막 중에 파티클(Particle)이 발생하고, 이 파티클이 기판 표면의 박막 내에 혼입됨에 따라, 성막 후의 기판의 전기비저항 값이 5×10-2∼5×10-3Ω㎝로 상대적으로 높아지는 문제가 있다.However, in the direct current plasma sputtering using the conventional AZO target composed only of aluminum oxide and zinc oxide, particles are generated during film formation, and as the particles are mixed into the thin film on the substrate surface, the electric resistivity value 5 × 10 -2 ~5 × 10 -3 a relatively higher in Ω㎝ problem.

또한, 파티클의 발생으로 인해 성막 속도가 저하됨은 물론, 성막 시간이 길어질수록 파티클의 수가 크게 늘어 종래의 AZO 타겟을 장기간 사용할 수 없다는 단점이 있다.In addition, the rate of film formation is lowered due to the generation of particles, and the longer the film formation time is, the larger the number of particles is increased and the conventional AZO target can not be used for a long time.

본 발명은 직류 마그네트론 스퍼터링 장치를 이용하여 기판상에 도전막을 성막하는 경우, 도전막(導電膜)의 전기비저항(resistivity) 값이 감소함과 아울러, 도전막의 막 성능에 악영향을 미치는 파티클의 발생이 억제되어, 성막 속도가 향상함은 물론, 스퍼터링용 타겟의 사용수명이 연장 가능한, 칼슘 첨가 AZO(Aluminum doped Zinc Oxide) 소결체와 이를 포함하는 스퍼터링용 타겟, 칼슘 첨가 도전막이 성막된 기판 및 기판의 성막 방법을 제공하는 데에 목적이 있다.In the case of forming a conductive film on a substrate using a DC magnetron sputtering apparatus, the resistivity value of the conductive film (conductive film) is decreased, and the generation of particles that adversely affect the film performance of the conductive film (Al-doped Zinc Oxide) sintered body and a sputtering target containing the same, a substrate on which a calcium-containing conductive film is formed, and a substrate on which a film is formed There is a purpose in providing a method.

상기 과제는, 칼슘 첨가 AZO 소결체에 함유되는 칼슘의 함량과, 반응촉진 가스인 수소가스의 챔버 내 도입량을 적절히 조절함으로써 달성될 수 있다.The above problem can be achieved by appropriately adjusting the content of calcium contained in the calcium-added AZO sintered body and the amount of hydrogen gas as a reaction promoting gas introduced into the chamber.

예로서, 본 발명에 따른 칼슘 첨가 AZO 소결체는, 산화알루미늄과 산화아연과 칼슘이 혼합된 혼합분말을 일정한 형태와 크기로 성형한 후, 1300∼1500℃의 온도에서 소결하여 이루어진 것을 특징으로 한다. 여기서 칼슘은 칼슘/아연의 원자수비로 0.001∼10at% 첨가하고, 알루미늄은 알루미늄/아연의 원자수비로 1∼3at% 혼합하는 것이 바람직하다. 또, 칼슘 원(source)으로서, 산화칼슘이나 탄산칼슘과 같은 칼슘 화합물을 이용하는 것이 바람직하다.For example, the calcium-added AZO sintered body according to the present invention is characterized in that a mixed powder in which aluminum oxide, zinc oxide and calcium are mixed is formed into a predetermined shape and size, and sintered at a temperature of 1300 to 1500 ° C. Here, it is preferable that calcium is added in an amount of 0.001 to 10 at% in terms of atomic ratio of calcium / zinc, and aluminum is mixed in an atomic ratio of 1 to 3 at% in aluminum / zinc. As the calcium source, it is preferable to use a calcium compound such as calcium oxide or calcium carbonate.

본 발명에 따른 칼슘 첨가 AZO 타겟은, 칼슘 첨가 AZO 소결체와 백킹 플레이트가 접합되어 이루어진 것을 특징으로 한다. 여기서 칼슘 첨가 AZO 소결체와 백킹 플레이트의 접합에는 인듐(indium)이 주로 사용된다.The calcium-doped AZO target according to the present invention is characterized in that a calcium-added AZO sintered body and a backing plate are joined. Indium (indium) is mainly used for bonding the calcium-doped AZO sintered body to the backing plate.

본 발명에 따른 기판은, 칼슘 첨가 도전막이 기판의 표면에 형성된 것을 특징으로 한다.The substrate according to the present invention is characterized in that a calcium-doped conductive film is formed on the surface of the substrate.

본 발명에 따른 기판의 성막 방법은, 직류 마그네트론 스퍼터링 장치를 이용하여 기판의 표면에 도전막을 성막하는 기판의 성막 방법에 있어서, 직류 마그네트론 스퍼터링 장치의 기판 홀더와 타겟 홀더를 이용하여 기판과 칼슘 첨가 AZO 타겟을 챔버 내에 배치하는 단계; 챔버의 배기구에 연결된 진공펌프를 구동하여 챔버의 내부압력이 성막 진공도(working pressure)에 도달할 때까지 챔버 내부를 배기하는 단계; 스퍼터링 가스로서 아르곤 가스를 챔버 내에 공급하고 반응촉진 가스로서 수소 가스를 챔버 내에 공급하는 단계; 및 직류 전원의 양극이 연결되는 기판과 음극이 연결되는 칼슘 첨가 AZO 타겟에 전압을 걸어 플라즈마 방전을 일으킴으로써 스퍼터링을 수행하는 단계; 를 포함하여 구성되며, 챔버 내에 공급하는 수소 가스 도입량은 칼슘 첨가 AZO 타겟에 함유된 칼슘의 함량에 따라 조절하는 것을 특징으로 한다.A method for depositing a substrate according to the present invention is a method for depositing a conductive film on a surface of a substrate using a DC magnetron sputtering apparatus, comprising the steps of: depositing a substrate and a calcium-added AZO Placing a target in a chamber; Driving a vacuum pump connected to the exhaust port of the chamber to exhaust the inside of the chamber until the internal pressure of the chamber reaches the working pressure; Supplying argon gas as a sputtering gas into the chamber and supplying hydrogen gas as a reaction promoting gas into the chamber; And performing a sputtering by causing a plasma discharge by applying a voltage to a substrate to which a cathode of a DC power source is connected and a calcium-doped AZO target to which a cathode is connected; And the amount of hydrogen gas supplied into the chamber is controlled in accordance with the content of calcium contained in the calcium-containing AZO target.

본 발명에 따르면, 칼슘(또는 칼슘 화합물)이 소량 함유된 칼슘 첨가 AZO 소결체로 이루어진 타겟을 이용하고, 직류 마그네트론 스퍼터링 장치의 챔버 내에 공급되는 수소가스 도입량을 적절히 제어함으로써, 낮은 전기비저항 값을 갖는 도전막을 기판 표면에 성막할 수 있다.According to the present invention, by using a target made of a calcium-added AZO sintered body containing a small amount of calcium (or a calcium compound) and appropriately controlling the amount of hydrogen gas supplied into the chamber of the DC magnetron sputtering apparatus, The film can be formed on the surface of the substrate.

또한, 본 발명에 따르면, 칼슘 무첨가 AZO 타겟을 이용하던 종래의 스퍼터링 방식에 비해, 도전막의 막 성질에 악영향을 끼치는 파티클의 발생이 억제되어 성막 속도가 빠르며, 스퍼터링용 타겟의 사용수명도 연장 가능하다.Further, according to the present invention, generation of particles which adversely affect the film properties of the conductive film is suppressed compared with the conventional sputtering method using the calcium-free AZO target, so that the deposition rate is high and the service life of the sputtering target can be extended .

도 1은 본 발명의 일 실시형태에 따른 칼슘(Ca) 첨가 AZO 소결체(칼슘 3at% 첨가)를 이용하여 기판에 성막한 도전막과, 비교예에 따른 칼슘 무첨가 AZO 소결체를 이용하여 기판에 성막한 도전막의 전기비저항 값을 비교한 그래프로서, 반응촉진 가스인 수소 가스의 챔버 내(內) 도입량의 변화에 따른 전기비저항 값의 변화를 나타낸 그래프.
도 2는 직류(DC) 마그네트론 스퍼터링 장치의 개략 구성을 나타낸 도면.
도 3은 본 발명의 일 실시형태에 따른 칼슘 첨가 AZO 타겟의 단면도.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a graph showing the results of measurement of a film thickness of a conductive film formed on a substrate using a calcium (Ca) -added AZO sintered body (with 3 at% calcium added) according to an embodiment of the present invention and a calcium-free AZO sintered body according to a comparative example A graph comparing the electrical resistivity values of the conductive films and showing the change of the electrical resistivity value with the change in the amount of hydrogen gas introduced as a reaction promoting gas into the chamber.
2 is a schematic view of a direct current (DC) magnetron sputtering apparatus;
3 is a cross-sectional view of a calcium-doped AZO target according to an embodiment of the present invention.

이하, 첨부도면을 참조하여, 본 발명의 일 실시예에 따른 칼슘 첨가 AZO 소결체와 스퍼터링용 타겟, 칼슘 첨가 도전막이 성막된 기판 및 기판의 성막 방법에 대해 설명한다.Hereinafter, with reference to the accompanying drawings, a method of depositing a calcium-added AZO sintered body, a sputtering target, a substrate on which a calcium-containing conductive film is formed, and a substrate according to an embodiment of the present invention will be described.

<칼슘 첨가 AZO 소결체><Calcium-doped AZO sintered body>

본 발명의 일 실시형태에 따른 칼슘 첨가 AZO 소결체는, 산화알루미늄(Al2O3) 분말과, 산화아연(ZnO2) 분말과, 칼슘(또는 칼슘 화합물) 분말을 적절한 비율로 혼합하여 제조한다. 예를 들면, 산화알루미늄 분말은 Al/Zn의 원자수비로 2at%가 되도록 혼합하고, 칼슘 분말은 Ca/Zn의 원자수비로 0.001∼10at%가 되도록 첨가하는 것이다.The calcium-added AZO sintered body according to one embodiment of the present invention is produced by mixing an aluminum oxide (Al 2 O 3 ) powder, a zinc oxide (ZnO 2 ) powder, and a calcium (or calcium compound) powder in an appropriate ratio. For example, the aluminum oxide powder is mixed so that the atomic ratio of Al / Zn is 2 at%, and the calcium powder is added so that the ratio of Ca / Zn is 0.001 to 10 at%.

본 발명의 일 실시예에 따르면, 칼슘 첨가 AZO 소결체는, 평균 입자 크기 1㎛ 이하의 산화알루미늄 분말:평균 입자 크기 5㎛ 이하의 산화아연 분말이 97:3의 질량비로 혼합되고 또한 칼슘(또는 칼슘 화합물) 분말이 Ca/Zn의 원자수비로 0.001∼10at%로 혼합된 혼합분말을 이용하여 제조된다.According to one embodiment of the present invention, the calcium-doped AZO sintered body is prepared by mixing an aluminum oxide powder having an average particle size of 1 탆 or less: zinc oxide powder having an average particle size of 5 탆 or less at a mass ratio of 97: 3, Compound) powders are mixed in an atomic ratio of Ca / Zn of 0.001 to 10 at%.

칼슘 첨가 AZO 소결체에 함유된 칼슘의 함량이 0.001at% 미만인 경우는 스퍼터링을 통해 기판의 표면에 성막되는 도전막의 전기비저항 값의 감소에 따른 파티클의 발생 억제 효과가 현저히 저하하고, 반대로, 칼슘의 함량이 10at%를 초과하는 경우는 칼슘 첨가 AZO 소결체의 밀도가 저하하여 기판의 표면에 도전막을 안정적으로 형성하기가 어려워진다. 칼슘 화합물로서 산화칼슘(CaO)과 탄산칼슘(CaCO3) 등을 이용할 수 있는데, 이들 중, CaCO3가 다루기 편하고 쉽게 구할 수 있어 바람직하다.When the content of calcium contained in the calcium-added AZO sintered body is less than 0.001 at%, the effect of suppressing the generation of particles due to the decrease of the electrical resistivity value of the conductive film formed on the surface of the substrate through sputtering is remarkably decreased. On the contrary, If it exceeds 10 at%, the density of the calcium-added AZO sintered body decreases and it becomes difficult to stably form a conductive film on the surface of the substrate. As the calcium compounds, calcium oxide (CaO) and calcium carbonate (CaCO 3 ) can be used. Of these, CaCO 3 is preferable because it is easily handled and easily obtainable.

다음으로, 상기 조성의 혼합분말에, 물, 바인더(binder), 소포제, 분산제와 같은 기타 첨가제를 소량 첨가한 후 볼 밀(Ball mill)이나 비드 밀(Beads mill) 등으로 분쇄 및 혼합하여 슬러리를 만든다. 볼 밀 등으로 분쇄 및 혼합할 때는, 슬러리의 점도가 100cps 이하가 되도록 하는 것이 바람직하다. 슬러리의 점도가 100cps를 초과하는 경우에는, 슬러리 내의 입자 크기가 커서 소결 후 밀도 저하와 분산성 저하 등의 원인이 된다.Next, a small amount of other additives such as water, a binder, an antifoaming agent and a dispersing agent is added to the mixed powder of the above composition, followed by pulverization and mixing with a ball mill or a beads mill, I make it. When pulverizing and mixing with a ball mill or the like, the viscosity of the slurry is preferably 100 cps or less. When the viscosity of the slurry is more than 100 cps, the particle size in the slurry is large, which causes a decrease in density and a decrease in dispersibility after sintering.

다음으로, 스프레이 드라이어(Spray dryer) 등을 이용하여 슬러리를 건조함으로써, 산화알루미늄, 산화아연, 칼슘이 균일하게 분산된 소결용 분말을 얻는다.Next, the slurry is dried using a spray dryer or the like to obtain a sintering powder in which aluminum oxide, zinc oxide and calcium are uniformly dispersed.

이렇게 해서 얻어진 소결용 분말로 일정 형상의 성형체를 제조한 후 고온에서 소결하여 고밀도의 칼슘 첨가 AZO 소결체를 제조한다.The sintered powder obtained is sintered at a high temperature to produce a high-density calcium-doped AZO sintered body.

공정의 편의성 등을 고려하여, 성형체는 냉간 정수압 프레스(Cold isostatic press:CIP)를 이용하여 제조하는 것이 바람직하며, 산소나 대기(大氣) 분위기 하에서 1300∼1500℃의 온도로 소결하는 것이 좋다.The compact is preferably manufactured using a cold isostatic press (CIP), and it is preferable to sinter the compact at a temperature of 1300 to 1500 占 폚 in oxygen or atmospheric air.

본 발명에 따른 칼슘 첨가 AZO 소결체를 이러한 조건에 따라 제조하는 경우, 밀도가 이론 밀도(=5.56g/㎤)의 97% 이상으로 유지될 수 있었다.When the calcium-added AZO sintered body according to the present invention was produced under these conditions, the density could be maintained at 97% or more of the theoretical density (= 5.56 g / cm 3).

<칼슘 첨가 AZO 타겟><Calcium-doped AZO target>

본 발명의 일 실시형태에 따른 칼슘 첨가 AZO 소결체(21)는, 도 3에 도시된 바와 같이, 일정한 크기와 형태로 가공한 후, 백킹 플레이트(Backing plate)(22)의 한쪽 면에 붙여, 칼슘 첨가 AZO 타겟(2)으로 제조한다.3, the calcium-added AZO sintered body 21 according to one embodiment of the present invention is processed into a predetermined size and shape and then attached to one side of a backing plate 22 to form calcium (2) as an additive AZO target.

예컨대, 직경이 3인치, 두께가 7㎜인 원판 형태로 칼슘 첨가 AZO 소결체(21)를 가공한 후, 구리로 이루어진 백킹 플레이트(22)의 한쪽 면에 인듐(indium)을 녹여 붙여 일체로 접합하는 것이다.For example, after processing the calcium-added AZO sintered body 21 in the form of a disk having a diameter of 3 inches and a thickness of 7 mm, indium is melted on one side of the backing plate 22 made of copper, will be.

<칼슘 첨가 도전막의 성막 방법>&Lt; Method for forming calcium-containing conductive film &

도 2에 개략적으로 도시된 직류 마그네트론 스퍼터링 장치(3)를 이용하여 낮은 전기비저항 값을 갖는 칼슘 첨가 도전막을 기판(1) 표면에 형성하는 과정에 대해 설명한다.A process of forming a calcium-containing conductive film having a low electrical resistivity value on the surface of the substrate 1 using the DC magnetron sputtering apparatus 3 schematically shown in Fig. 2 will be described.

먼저, 기판 홀더(32)와 타겟 홀더(35)를 이용해서, 기판(1)과 칼슘 첨가 AZO 타겟(2)을 챔버(31) 내에 배치한다.First, the substrate 1 and the calcium-doped AZO target 2 are placed in the chamber 31 by using the substrate holder 32 and the target holder 35.

이어서, 챔버(31)의 배기구(33)에 연결된 진공펌프(도시하지 않음)를 구동하여 챔버(31)의 내부압력이 1×10-3㎩가 될 때까지 챔버(31)의 내부를 배기한다.Subsequently, a vacuum pump (not shown) connected to the exhaust port 33 of the chamber 31 is driven to exhaust the inside of the chamber 31 until the internal pressure of the chamber 31 becomes 1 × 10 -3 Pa .

챔버(31)의 내부압력이 성막 진공도(working pressure)인 1×10-3㎩로 유지된 상태에서, 스퍼터링 가스로서 아르곤 가스를 챔버(31) 내에 80sccm 공급하고, 반응촉진(reactive) 가스로서 수소 가스를 챔버(31) 내에 공급한다. 이때, 챔버로의 수소 가스 도입량은, 칼슘 첨가 AZO 소결체(21)에 함유된 칼슘의 함량에 따라, 칼슘 함량의 0.0% 초과∼0.2% 이하의 범위 내에서, 바람직하게는, 도 1에 도시된 바와 같이, 칼슘 함량의 0.0% 초과∼0.06% 이하의 범위 내에서 조절한다.Argon gas was supplied as 80% of argon gas as a sputtering gas into the chamber 31 at a flow rate of 80 sccm while the internal pressure of the chamber 31 was kept at 1 × 10 -3 Pa which is the working pressure of the film forming chamber. Gas is supplied into the chamber 31. At this time, the amount of hydrogen gas introduced into the chamber is preferably in the range of more than 0.0 to 0.2% of the calcium content, preferably in the range of more than 0.02% of the calcium content, , It is adjusted within a range of more than 0.0 to 0.06% of the calcium content.

다음으로, 80∼100W 출력의 직류 전원(DC power)(34)을 통해, 직류 전원(34)의 양극이 연결된 기판(1)과 음극이 연결된 칼슘 첨가 AZO 타겟(2)에 전압을 인가하여 기판(1)과 칼슘 첨가 AZO 타겟(2) 사이에서 플라즈마 방전을 일으킴으로써 스퍼터링을 수행한다. 스퍼터링이 행해지는 동안, 기판(1)의 온도는, 60∼300℃로 유지된다.Next, a voltage is applied to the substrate 1 connected to the positive electrode of the DC power supply 34 and the calcium-doped AZO target 2 connected to the negative electrode through a DC power source 34 having an output of 80 to 100 W, Sputtering is performed by causing a plasma discharge between the calcium-added AZO target 1 and the calcium-added AZO target 2. During the sputtering, the temperature of the substrate 1 is maintained at 60 to 300 캜.

상기와 같은 성막 과정을 통해, 예컨대, 전기비저항 값이 5×10-3∼5×10-4Ωcm로서 LCD 등의 ITO 투명 도전막에 근접하는 도전막을 갖는 기판(1)을 얻게 된다.Through the above-described film-forming process, the substrate 1 having the conductive film close to the ITO transparent conductive film such as LCD is obtained, for example, with an electrical resistivity value of 5 × 10 -3 to 5 × 10 -4 Ωcm.

후술하는 실시예와 비교예를 통해, 본 발명의 구성 및 작용효과가 더 명확해지지만, 본 발명이 아래의 실시예로 국한되는 것은 아니다.The structure and effect of the present invention become clearer through the following examples and comparative examples, but the present invention is not limited to the following examples.

(실시예)(Example)

순도가 99.99%이고 평균 입경이 0.7㎛인 산화알루미늄 분말 30g과, 순도가 99.99%이고 평균 입경이 3㎛인 산화아연 분말 970g과, 순도가 99.99%이고 평균 입경이 1㎛인 탄산칼슘 0.5g을, 물 1L에 혼합하여, 슬러리를 만든다. 그리고 이 슬러리에 10wt% 희석 PVA(PolyVinylAlcohol) 220g과, PEG(PolyEtyleneGlycol) 8g과, 분산제 34.2g 및 소포제 0.07g을 첨가하여 혼합 슬러리를 얻는다.30 g of aluminum oxide powder having a purity of 99.99% and an average particle diameter of 0.7 탆, 970 g of zinc oxide powder having a purity of 99.99% and an average particle diameter of 3 탆, 0.5 g of calcium carbonate having a purity of 99.99% and an average particle diameter of 1 탆 , And 1 L of water to prepare a slurry. 220 g of 10 wt% diluted PVA (PolyVinilyl alcohol), 8 g of PEG (PolyEngylene Glycol), 34.2 g of a dispersant and 0.07 g of a defoaming agent are added to this slurry to obtain a mixed slurry.

이어서 혼합 슬러리를 약 20분간 비드 밀을 이용하여 혼합 및 분쇄한 후, 스프레이 드라이어를 이용하여 건조 분말을 얻는다.Then, the mixed slurry is mixed and pulverized using a bead mill for about 20 minutes, and then a dry powder is obtained by using a spray dryer.

건조 분말은, 18톤(ton)/㎠의 압력으로 1축 가압 성형 후, 냉간 정수압 프레스 공정을 거쳐, 직경이 3인치, 두께가 1㎝인 원판 형태의 성형체로 제조된다.The dried powder is subjected to uniaxial press forming at a pressure of 18 ton / cm2 and then subjected to cold isostatic pressing to produce a disk-shaped molded article having a diameter of 3 inches and a thickness of 1 cm.

그리고 나서 이 성형체를 대기(air) 분위기 하에서, 약 1350℃의 온도로 6시간 소결하여, 칼슘 첨가 AZO 소결체를 얻는다. 이 칼슘 첨가 AZO 소결체는 밀도가 이론 밀도(=5.56g/cm3)의 97.63%로서, 칼슘이 첨가되었음에도 불구하고 고밀도를 나타내었다.Then, the formed body was sintered at about 1350 ° C for 6 hours in an air atmosphere to obtain a calcium-added AZO sintered body. The density of the calcium - doped AZO sintered body was 97.63% of the theoretical density (= 5.56 g / cm 3 ), indicating high density even though calcium was added.

이렇게 해서 얻어진 칼슘 첨가 AZO 소결체(21)는, 도 3에 도시된 바와 같이, 구리로 이루어진 백킹 플레이트(backing plate)(22)에 인듐을 녹여서 일체로 접합하여 칼슘 첨가 AZO 타겟(2)으로 이용한다.As shown in Fig. 3, the thus obtained calcium-added AZO sintered body 21 is formed by bonding indium to a backing plate 22 made of copper and integrally joining it to use as a calcium-added AZO target 2.

칼슘 첨가 AZO 타겟(2)을 이용한 스퍼터링 공정은, 다음과 같은 단계로 행해진다.The sputtering process using the calcium-added AZO target 2 is performed in the following steps.

우선, 직류 마그네트론 스퍼터링 장치(3)의 기판 홀더(32)와 타겟 홀더(35)를 이용하여 기판(1)과 칼슘 첨가 AZO 타겟(2)을 챔버(31) 내에 각각 배치한다. 챔버(31) 내에 배치된 상태에서, 기판(1)과 칼슘 첨가 AZO 타겟(2)은 약 50㎜ 떨어져서 대향(對向)한다. 기판(1)으로는, 무(無)알칼리 유리판을 이용한다.First, the substrate 1 and the calcium-added AZO target 2 are placed in the chamber 31 using the substrate holder 32 and the target holder 35 of the DC magnetron sputtering apparatus 3, respectively. With the substrate 1 placed in the chamber 31, the calcium-doped AZO target 2 faces away by about 50 mm. As the substrate 1, a non-alkali glass plate is used.

그 뒤, 챔버(31) 일측의 배기구(33)에 연결된 진공펌프를 구동하여 챔버(31)의 내부압력이 성막 진공도인 1×10-3㎩에 도달할 때까지 챔버(31) 안을 배기한다.Thereafter, the vacuum pump connected to the exhaust port 33 on one side of the chamber 31 is driven to exhaust the inside of the chamber 31 until the internal pressure of the chamber 31 reaches 1 x 10 &lt; -3 &gt;

그리고 나서 이 챔버(31) 내에, 스퍼터링 가스로서 아르곤 가스를 약 80sccm 공급함과 아울러, 반응촉진 가스로서 수소 가스를 소량 공급한다.Then, about 80 sccm of argon gas is supplied as a sputtering gas into the chamber 31, and a small amount of hydrogen gas is supplied as a reaction promoting gas.

이어서, 직류 전원(34)의 양극과 음극이 연결된 기판(1)과 칼슘 첨가 AZO 타겟(2)에 100W 전력을 공급하여, 챔버(31) 내에서 플라즈마 방전을 일으켜 약 5분간 스퍼터링을 행한다. 이때, 기판(1)의 온도는 약 300℃로 유지된다.Subsequently, 100 W of electric power is supplied to the substrate 1 and the calcium-added AZO target 2 to which the anode and the cathode of the DC power supply 34 are connected, thereby causing plasma discharge in the chamber 31 and sputtering is performed for about 5 minutes. At this time, the temperature of the substrate 1 is maintained at about 300 캜.

본 발명의 효과를 확인하기 위해, 기판(1) 표면에 성막된 투명 도전막의 전기비저항 값을 4-포인트 프로브(point probe) 방식으로 측정했다.In order to confirm the effect of the present invention, the electrical resistivity value of the transparent conductive film formed on the surface of the substrate 1 was measured by a 4-point probe method.

측정 결과, 칼슘이 3at% 함유된 칼슘 첨가 AZO 타겟(2)을 사용하고 반응촉진 가스인 수소 가스를 칼슘 함량의 0.03% 첨가하여 스퍼터링을 행했을 때 기판(1) 표면에 생성된 도전막의 전기비저항 값이 ITO 투명 도전막에 근접하는 낮은 전기비저항 값(5×10-4Ωcm)을 나타내었다. 이 측정 결과로부터, 기판(1) 표면에 성막되는 도전막의 전기비저항 값이 클 때 발생할 수 있는 파티클의 발생을 줄일 수 있음을 알 수 있다.As a result of the measurement, when the calcium-added AZO target 2 containing 3 at% of calcium was used and hydrogen gas as the reaction promoting gas was added by 0.03% of the calcium content and sputtering was performed, the electrical resistivity of the conductive film formed on the surface of the substrate 1 Exhibited a low electrical resistivity value (5 x 10 &lt; -4 &gt; [Omega] cm) close to the ITO transparent conductive film. From these measurement results, it can be seen that the generation of particles which can occur when the electrical resistivity of the conductive film formed on the surface of the substrate 1 is large can be reduced.

(비교예)(Comparative Example)

칼슘의 첨가 없이, 실시예와 동일한 방식으로 AZO 타겟을 제작했다.AZO target was prepared in the same manner as in Example, without addition of calcium.

칼슘 무첨가 AZO 소결체의 밀도는 이론 밀도의 97.66%로서, 실시예와 비교하여, 별 차이가 없었다.The density of the AZO sintered body without calcium added was 97.66% of the theoretical density, and there was no significant difference compared with the examples.

또한, 실시예와 마찬가지의 조건 하에서, 기판의 표면에 도전막을 성막한 후, 전기비저항 값을 측정하였다.Further, under the same conditions as in the examples, a conductive film was formed on the surface of the substrate, and then the electrical resistivity value was measured.

그 결과, 도 1에 도시된 바와 같이, 칼슘이 첨가되지 않은 AZO 타겟을 사용하여 성막한 경우는 도전막의 전기비저항 값이 5×10-2∼2×10-2Ωcm을 나타내어, 본 실시예의 경우보다 10배 이상 높은 전기비저항 값을 나타내었으며, 수소 가스 도입량을 변화시켜도 전기비저항 값은 거의 변화되지 않았다.As a result, as shown in Fig. 1, when the film is formed using an AZO target not doped with calcium, the electrical resistivity value of the conductive film is 5 x 10 -2 to 2 x 10 -2 ? Cm, and in the case of this embodiment And the electrical resistivity values were almost unchanged even when the amount of hydrogen gas introduced was changed.

1...기판
2...칼슘 첨가 AZO 타겟
21...칼슘 첨가 AZO 소결체
22...백킹 플레이트
3...직류 마그네트론 스퍼터링 장치
31...챔버
32...기판 홀더
33...배기구
34...직류 전원
35...타겟 홀더
1 ... substrate
2 ... Calcium added AZO target
21 ... Calcium-doped AZO sintered body
22 ... backing plate
3 ... DC magnetron sputtering device
31 ... chamber
32 ... substrate holder
33 ... exhaust
34 ... DC power source
35 ... target holder

Claims (7)

삭제delete 삭제delete 삭제delete 삭제delete 삭제delete 삭제delete 직류 마그네트론 스퍼터링 장치를 이용하여, 기판의 표면에 도전막을 성막하는 기판의 성막 방법에 있어서,
칼슘은, 칼슘/아연의 원자수비로 0.001∼10at% 첨가되고, 알루미늄은, 알루미늄/아연의 원자수비로 1∼3at% 혼합되는 칼슘 첨가 AZO 혼합분말을 성형 후, 소결하여 일정 크기로 가공한 후, 구리로 이루어진 백킹 플레이트의 한쪽 면에 인듐을 녹여 붙여 일체로 접합하여 형성한 AZO 타켓과 기판을 직류 마그네트론 스퍼터링 장치의 기판 홀더와 타겟 홀더를 이용하여 챔버 내에 배치하는 단계;
챔버의 배기구에 연결된 진공펌프를 구동하여, 챔버의 내부압력이 성막 진공도(working pressure)에 도달할 때까지 챔버 내부를 배기하는 단계;
스퍼터링 가스로서 아르곤 가스를 챔버 내에 공급함과 아울러, 반응촉진 가스로서 수소 가스를 챔버 내에 공급하는 단계;
직류 전원의 양극이 연결되는 기판과 음극이 연결되는 칼슘 첨가 AZO 타겟에 전압을 걸어, 플라즈마 방전을 일으킴으로써, 스퍼터링을 수행하는 단계;
를 포함하여 구성되며,
챔버 내에 공급하는 수소 가스의 도입량은, 칼슘 첨가 AZO 타겟에 함유된 칼슘 함량의 0.0at% 초과∼0.06at%이하의 범위내에서 조절되는 것을 특징으로 하는 기판의 성막 방법.
A method for forming a conductive film on a surface of a substrate using a DC magnetron sputtering apparatus,
Calcium is added in an amount of 0.001 to 10 at% in terms of atomic ratio of calcium / zinc, and aluminum is mixed in a ratio of 1 to 3 at% in atomic ratio of aluminum / zinc. The calcium-added AZO mixed powder is sintered, Placing an AZO target and a substrate formed by melting indium on one side of a backing plate made of copper and integrally joining them in a chamber using a substrate holder and a target holder of a DC magnetron sputtering apparatus;
Driving a vacuum pump connected to the exhaust port of the chamber to exhaust the inside of the chamber until the internal pressure of the chamber reaches the working pressure;
Supplying argon gas as a sputtering gas into the chamber and supplying hydrogen gas as a reaction promoting gas into the chamber;
Performing sputtering by applying a voltage to a substrate to which a cathode of a DC power source is connected and a calcium-doped AZO target to which a cathode is connected, thereby generating a plasma discharge;
And,
Wherein the introduction amount of the hydrogen gas to be supplied into the chamber is controlled within a range of more than 0.0at% to 0.06at% of the calcium content contained in the calcium-added AZO target.
KR1020120054565A 2012-05-23 2012-05-23 Sintered AZO formation adding Calcium, sputtering target comprised of the formation, substrate with Calcium containing conduction layer, and method for depositing the layer KR101409543B1 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20080065899A (en) * 2007-01-10 2008-07-15 닛토덴코 가부시키가이샤 Transparent conductive film and method for manufacturing the same
JP2009249187A (en) * 2008-04-01 2009-10-29 Hitachi Metals Ltd Zinc oxide sintered compact, its producing method, sputtering target and electrode
KR20100052714A (en) * 2008-11-11 2010-05-20 희성금속 주식회사 High density zinc oxide based sputtering target
KR101128499B1 (en) 2011-10-25 2012-03-27 희성금속 주식회사 A preparation method of high density zinc oxide based sputtering target and transparent electroconductive film

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20080065899A (en) * 2007-01-10 2008-07-15 닛토덴코 가부시키가이샤 Transparent conductive film and method for manufacturing the same
JP2009249187A (en) * 2008-04-01 2009-10-29 Hitachi Metals Ltd Zinc oxide sintered compact, its producing method, sputtering target and electrode
KR20100052714A (en) * 2008-11-11 2010-05-20 희성금속 주식회사 High density zinc oxide based sputtering target
KR101128499B1 (en) 2011-10-25 2012-03-27 희성금속 주식회사 A preparation method of high density zinc oxide based sputtering target and transparent electroconductive film

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