KR19990057881A - Capacitor Formation Method of Semiconductor Device - Google Patents

Capacitor Formation Method of Semiconductor Device Download PDF

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KR19990057881A
KR19990057881A KR1019970077960A KR19970077960A KR19990057881A KR 19990057881 A KR19990057881 A KR 19990057881A KR 1019970077960 A KR1019970077960 A KR 1019970077960A KR 19970077960 A KR19970077960 A KR 19970077960A KR 19990057881 A KR19990057881 A KR 19990057881A
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forming
film
capacitor
semiconductor device
metal
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KR1019970077960A
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KR100505455B1 (en
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조민수
이석재
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김영환
현대전자산업 주식회사
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L28/00—Passive two-terminal components without a potential-jump or surface barrier for integrated circuits; Details thereof; Multistep manufacturing processes therefor
    • H01L28/40—Capacitors
    • H01L28/60—Electrodes
    • H01L28/75—Electrodes comprising two or more layers, e.g. comprising a barrier layer and a metal layer
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L28/00—Passive two-terminal components without a potential-jump or surface barrier for integrated circuits; Details thereof; Multistep manufacturing processes therefor
    • H01L28/40—Capacitors
    • H01L28/55—Capacitors with a dielectric comprising a perovskite structure material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L28/00—Passive two-terminal components without a potential-jump or surface barrier for integrated circuits; Details thereof; Multistep manufacturing processes therefor
    • H01L28/40—Capacitors
    • H01L28/60—Electrodes
    • H01L28/65—Electrodes comprising a noble metal or a noble metal oxide, e.g. platinum (Pt), ruthenium (Ru), ruthenium dioxide (RuO2), iridium (Ir), iridium dioxide (IrO2)

Abstract

본 발명은 유전막 또는 산화전극의 산소가 금속 하부전극을 통하여 확산됨으로써 확산방지막 및 그 하부의 폴리실리콘 플러그 등이 산화됨으로 인하여 콘택저항이 증가하는 것을 방지할 수 있는 캐패시터 및 그 형성 방법에 관한 것으로, 캐패시터의 하부전극을 이루는 금속막을 결정립계 크기가 다른 다층의 막으로 형성하여 금속막 내에 산소 확산 경로를 차단함으로써, 금속막 하부의 티타늄질화막 및 폴리실리콘막이 산화되는 것을 방지하여 소자의 특성 저하를 억제한다.The present invention relates to a capacitor and a method of forming the same, which can prevent an increase in contact resistance due to oxidation of a diffusion barrier layer and a polysilicon plug under the oxygen by diffusion of oxygen from a dielectric layer or an oxide electrode through a metal lower electrode. The metal film forming the lower electrode of the capacitor is formed into a multilayer film having a different grain boundary size to block oxygen diffusion paths in the metal film, thereby preventing the titanium nitride film and the polysilicon film under the metal film from being oxidized, thereby suppressing deterioration of device characteristics. .

Description

반도체 소자의 캐패시터 형성 방법Capacitor Formation Method of Semiconductor Device

본 발명은 반도체 장치에 관한 것으로, 특히 금속 하부전극으로 산소가 확산되는 것을 방지할 수 있는 반도체 소자의 캐패시터 및 그 형성 방법에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a semiconductor device, and more particularly, to a capacitor of a semiconductor element capable of preventing the diffusion of oxygen into a metal lower electrode and a method of forming the same.

캐패시터의 하부전극으로 산화막전극과 금속전극 등이 사용되는데, 하부전극 형성 이후, 하부전극 상의 유전막 또는 산화막전극의 산소가 금속전극을 통하여 금속전극으로 확산됨으로 인하여, 확산방지막 및 그 하부의 폴리실리콘이 산화된다. 따라서, 콘택 저항 증가에 따라 캐패시터의 전기적 특성 및 소자의 신뢰도가 저하되는 문제점이 있다.An oxide electrode and a metal electrode are used as the lower electrode of the capacitor. After forming the lower electrode, since the oxygen of the dielectric film or the oxide electrode on the lower electrode diffuses through the metal electrode to the metal electrode, the diffusion barrier layer and the polysilicon underneath are formed. Is oxidized. Therefore, there is a problem that the electrical characteristics of the capacitor and the reliability of the device is lowered as the contact resistance increases.

상기와 같은 문제점을 해결하기 위하여 안출된 본 발명은, 유전막 또는 산화전극의 산소가 금속 하부전극을 통하여 확산됨으로써 확산방지막 및 그 하부의 폴리실리콘 플러그 등이 산화됨으로 인하여 콘택저항이 증가하는 것을 방지할 수 있는 반도체 소자의 캐패시터 및 그 형성 방법을 제공하는데 그 목적이 있다.The present invention devised to solve the above problems, the oxygen of the dielectric film or the oxide electrode is diffused through the metal lower electrode to prevent the contact resistance increases due to the oxidation of the diffusion barrier film and the polysilicon plug beneath it. It is an object of the present invention to provide a capacitor of a semiconductor device and a method of forming the same.

도 1 내지 도3은 본 발명의 일실시예에 따른 캐패시터 형성 공정 단면도1 to 3 are cross-sectional views of a capacitor forming process according to an embodiment of the present invention.

* 도면의 주요 부분에 대한 부호의 설명* Explanation of symbols for the main parts of the drawings

10: 반도체 기판 11: 층간절연막10: semiconductor substrate 11: interlayer insulating film

12: 폴리실리콘 플러그 13: 티타늄막12: polysilicon plug 13: titanium film

14: 티타늄질화막 15: 다층의 금속막14: titanium nitride film 15: multilayer metal film

16: 산화막 전극 17: 유전막16: oxide film electrode 17: dielectric film

18: 금속막18: metal film

상기 목적을 달성하기 위한 본 발명은, 반도체 기판 상에 형성된 콘택홀 내에 폴리실리콘 플러그를 형성하는 단계; 상기 폴리실리콘 플러그를 통하여 반도체 기판과 연결되며, 결정립계의 크기가 다른 다층의 금속막으로 이루어진 하부전극을 형성하는 단계; 상기 하부전극 상에 유전막을 형성하는 단계; 및 상기 유전막 상에 상부전극을 형성하는 단계를 포함하여 이루어지는 반도체 소자의 캐패시터 형성 방법을 제공한다.The present invention for achieving the above object, forming a polysilicon plug in a contact hole formed on a semiconductor substrate; Forming a lower electrode connected to the semiconductor substrate through the polysilicon plug and formed of a multilayer metal film having different grain boundaries; Forming a dielectric film on the lower electrode; And forming an upper electrode on the dielectric layer.

본 발명은 캐패시터의 하부전극을 이루는 금속막을 결정립계 크기가 다른 다층의 막으로 형성하여 금속막 내에 산소 확산 경로를 차단함으로써, 금속막 하부의 티타늄질화막 및 폴리실리콘막이 산화되는 것을 방지할 수 있는 방법이다.The present invention is a method of preventing the oxidation of the titanium nitride film and the polysilicon film under the metal film by blocking the oxygen diffusion path in the metal film by forming the metal film forming the lower electrode of the capacitor as a multilayer film having a different grain boundary size. .

이하, 본 발명의 일실시예에 따른 반도체 소자의 캐패시터 형성 공정 단면도인 도1 내지 도3을 참조하여 본 발명을 설명한다.Hereinafter, the present invention will be described with reference to FIGS. 1 to 3 which are cross-sectional views of a capacitor forming process of a semiconductor device according to an embodiment of the present invention.

먼저, 도1에 도시한 바와 같이 반도체 기판(10) 상에 형성된 층간절연막(11)을 선택적으로 식각하여 반도체 기판(10) 표면을 노출하는 콘택홀을 형성하고, 전체 구조 상부에 화학기상증착법으로 500 Å 내지 5000 Å의 폴리실리콘막을 증착한 후, 전면식각을 실시하여 콘택홀 내에만 폴리실리콘만 남도록 하여 폴리실리콘 플러그(12)를 형성한다.First, as shown in FIG. 1, the interlayer insulating film 11 formed on the semiconductor substrate 10 is selectively etched to form a contact hole exposing the surface of the semiconductor substrate 10, and by chemical vapor deposition on the entire structure. After depositing a polysilicon film of 500 kV to 5000 kV, the polysilicon plug 12 is formed by performing full surface etching so that only polysilicon remains in the contact hole.

다음으로, 도2에 도시한 바와 같이 티타늄막(13) 및 티타늄질화막(14)을 각각 100 Å 내지 1000 Å 두께로 증착하고 열처리한 다음, Ru 또는 Ir 등과 같은 금속을 100 ℃ 이하의 온도 및 300 ℃ 내지 700 ℃ 온도에서 각각 증착하여 100 Å 내지 3000Å 두께가 되도록 한다. 즉, 100 ℃ 이하의 온도에서 Ru 또는 Ir 등을 증착하는 단계와 300 ℃ 내지 700 ℃ 온도에서 Ru 또는 Ir 등을 증착하는 단계를 되풀이하여, 다른 온도 조건에서 형성된 다층의 금속막(15)을 형성한다. 이어서, 다층의 금속막(15) 상에 100 Å 내지 5000 Å 두께의 RuO2막 또는 lrO2막 등의 산화막전극(16)을 형성하고, 산화막전극(16), 다층의 금속막(15), 티타늄질화막(14) 및 티타늄(13)을 패터닝하여 하부전극을 형성한다.Next, as shown in FIG. 2, the titanium film 13 and the titanium nitride film 14 are deposited to a thickness of 100 kPa to 1000 kPa, respectively, and heat-treated. Then, a metal such as Ru or Ir or the like is heated to a temperature of 100 ° C. or lower and 300 ° C. The deposition is carried out at a temperature of from 700 ° C. to 700 ° C. so as to have a thickness of 100 kPa to 3000 kPa. That is, the steps of depositing Ru or Ir at a temperature of 100 ° C. or less and depositing Ru or Ir at a temperature of 300 ° C. to 700 ° C. are repeated to form a multi-layered metal film 15 formed at different temperature conditions. do. Subsequently, an oxide film electrode 16 such as a RuO 2 film or an lrO 2 film having a thickness of 100 GPa to 5000 GPa is formed on the multilayer metal film 15, and the oxide film electrode 16, the multilayer metal film 15, The titanium nitride film 14 and the titanium 13 are patterned to form a lower electrode.

다음으로, 도3에 도시한 바와 같이 전체구조 상부에 50 Å 내지 2000 Å 두께의 유전막(17)을 PbTiO3, PbZr1-XTiXO3, PbLa1-XZrXTiO3, SrBi2Ta2O9, Bi4Ti3O12, BaTiO3, Ba1-XSrXTiO3또는 SrTiO3으로 형성하고, 유전막(17) 상에 상부전극을 형성하기 위하여 300 Å 내지 2000 Å 두께의 Ru막 또는lr막 등의 금속막(18)을 형성한다.Next, as shown in FIG. 3, the dielectric film 17 having a thickness of 50 mV to 2000 mV is formed on the entire structure of PbTiO 3 , PbZr 1- XTi X O 3 , PbLa 1-X Zr X TiO 3 , and SrBi 2 Ta 2. A Ru film having a thickness of 300 mV to 2000 mV to form an upper electrode on the dielectric layer 17 and formed of O 9 , Bi 4 Ti 3 O 12 , BaTiO 3 , Ba 1-X Sr X TiO 3, or SrTiO 3 ; Metal films 18 such as lr films are formed.

이후, 금속막(18) 및 유전막(17)을 패터닝하여 캐패시터를 완성한다.Subsequently, the metal film 18 and the dielectric film 17 are patterned to complete the capacitor.

이상에서 설명한 본 발명은 전술한 실시예 및 첨부된 도면에 의해 한정되는 것이 아니고, 본 발명의 기술적 사상을 벗어나지 않는 범위 내에서 여러 가지 치환, 변형 및 변경이 가능하다는 것이 본 발명이 속하는 기술 분야에서 통상의 지식을 가진 자에게 있어 명백할 것이다.The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes are possible in the technical field of the present invention without departing from the technical spirit of the present invention. It will be clear to those of ordinary knowledge.

상기와 같이 이루어지는 본 발명은, 결정립계가 다른 다수의 금속을 적층하여 금속 하부전극을 형성함으로써, 유전막을 증착하거나 열처리시 산소의 확산을 억제함으로서 금속전극과 확산방지막의 계면 또는 금속전극과 폴리실리콘의 계면에 TiO2, TiNO, SiO2등과 같은 산화물이 생성되는 것을 방지함으로써, 콘택 저항의 증가를 억제하여 반도체 소자의 신뢰도를 향상시킬 수 있다.According to the present invention, a metal lower electrode is formed by stacking a plurality of metals having different grain boundaries, thereby suppressing diffusion of oxygen during deposition or heat treatment of a dielectric film, thereby preventing the diffusion of the electrode from the metal electrode and the diffusion barrier layer, By preventing the formation of oxides such as TiO 2 , TiNO, SiO 2, and the like at the interface, an increase in contact resistance can be suppressed to improve the reliability of the semiconductor device.

Claims (11)

반도체 기판 상에 형성된 콘택홀 내에 폴리실리콘 플러그를 형성하는 단계;Forming a polysilicon plug in a contact hole formed on the semiconductor substrate; 상기 폴리실리콘 플러그를 통하여 반도체 기판과 연결되며, 결정립계의 크기가 다른 다층의 금속막으로 이루어진 하부전극을 형성하는 단계;Forming a lower electrode connected to the semiconductor substrate through the polysilicon plug and formed of a multilayer metal film having different grain boundaries; 상기 하부전극 상에 유전막을 형성하는 단계; 및Forming a dielectric film on the lower electrode; And 상기 유전막 상에 상부전극을 형성하는 단계를 포함하여 이루어지는 반도체 소자의 캐패시터 형성 방법.And forming an upper electrode on the dielectric layer. 제 1 항에 있어서,The method of claim 1, 상기 폴리실리콘 플러그를 형성하는 단계 후,After forming the polysilicon plug, 금속확산방지막을 형성하는 단계를 더 포함하는 반도체 소자의 캐패시터 형성 방법.Capacitor forming method of a semiconductor device further comprising the step of forming a metal diffusion prevention film. 제 1 항에 있어서,The method of claim 1, 상기 금속확산방지막은,The metal diffusion barrier, Ti막 및 TiN막으로 형성하는 반도체 소자의 캐패시터 형성 방법.A method for forming a capacitor of a semiconductor device formed of a Ti film and a TiN film. 제 1 항에 있어서,The method of claim 1, 상기 Ti막 및 TiN막은,The Ti film and the TiN film, 각각 100 Å 내지 1000 Å 두께로 형성하는 반도체 소자의 캐패시터 형성 방법.A capacitor formation method for a semiconductor device, each having a thickness of 100 kHz to 1000 kHz. 제 1 항에 있어서,The method of claim 1, 상기 하부전극은,The lower electrode, Ru 또는 Ir으로 형성하는 반도체 소자의 캐패시터 형성 방법.A method for forming a capacitor of a semiconductor device formed of Ru or Ir. 제 5 항에 있어서,The method of claim 5, 상기 하부전극을 형성하는 단계는,Forming the lower electrode, 100 ℃가 넘지 않는 온도에서 제1 금속막을 형성하는 제1 단계와 300 ℃ 내지 700℃ 온도에서 제2 금속막을 형성하는 제2 단계로 이루어지는 반도체 소자의 캐패시터 형성 방법.A method of forming a capacitor in a semiconductor device comprising a first step of forming a first metal film at a temperature not exceeding 100 ° C and a second step of forming a second metal film at a temperature of 300 ° C to 700 ° C. 제 6 항에 있어서,The method of claim 6, 상기 제1 단계 및 제2 단계를 적어도 한 번 실시하는 반도체 소자의 캐패시터 형성 방법.A method for forming a capacitor of a semiconductor device, wherein the first step and the second step are performed at least once. 제 1 항 또는 제 6 항에 있어서,The method according to claim 1 or 6, 상기 유전막은,The dielectric film, PbTiO3, PbZr1-XTiXO3, PbLa1-XZrXTiO3, SrBi2Ta2O9, Bi4Ti3O12, BaTiO3, Ba1-XSrXTiO3, 또는 SrTiO3으로 형성하는 반도체 소자의 캐패시터 형성 방법.PbTiO 3 , PbZr 1- XTi X O 3 , PbLa 1-X Zr X TiO 3 , SrBi 2 Ta 2 O 9 , Bi 4 Ti 3 O 12 , BaTiO 3 , Ba 1-X Sr X TiO 3 , or SrTiO 3 A method for forming a capacitor of a semiconductor device to be formed. 제 1 항 또는 제 6 항에 있어서,The method according to claim 1 or 6, 상기 상부전극은,The upper electrode, Ru 또는 lr으로 형성하는 반도체 소자의 캐패시터 형성 방법.A method of forming a capacitor of a semiconductor device formed by Ru or lr. 제 5 항 또는 제 6 항에 있어서,The method according to claim 5 or 6, 상기 금속막 상에 RuO2막 또는 lrO2막을 형성하는 단계를 더 포함하는 반도체 소자의 캐패시터 형성 방법.And forming a RuO 2 film or an lrO 2 film on the metal film. 제 10 항에 있어서,The method of claim 10, 상기 RuO2막 또는 lrO2막은,The RuO 2 film or lrO 2 film, 100 Å 내지 5000 Å 두께로 형성하는 반도체 소자의 캐패시터 형성 방법.A method for forming a capacitor of a semiconductor device to form a thickness of 100 GPa to 5000 GPa.
KR1019970077960A 1997-12-30 1997-12-30 Capacitor Formation Method of Semiconductor Device KR100505455B1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20020058408A (en) * 2000-12-30 2002-07-12 박종섭 Method for fabricating metal electrode with ruthenium
KR100849178B1 (en) * 2006-10-11 2008-07-30 삼성전자주식회사 Semiconductor device having binary metal electrode capacitor and method of fabricating the same

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US5708302A (en) * 1995-04-26 1998-01-13 Symetrix Corporation Bottom electrode structure for dielectric capacitors
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KR19980068062A (en) * 1997-02-14 1998-10-15 김광호 Capacitor Manufacturing Method of Semiconductor Device

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Publication number Priority date Publication date Assignee Title
KR20020058408A (en) * 2000-12-30 2002-07-12 박종섭 Method for fabricating metal electrode with ruthenium
KR100849178B1 (en) * 2006-10-11 2008-07-30 삼성전자주식회사 Semiconductor device having binary metal electrode capacitor and method of fabricating the same

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