KR20050090206A - Method for forming contact plug of semiconductor devices - Google Patents
Method for forming contact plug of semiconductor devices Download PDFInfo
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- KR20050090206A KR20050090206A KR1020040015464A KR20040015464A KR20050090206A KR 20050090206 A KR20050090206 A KR 20050090206A KR 1020040015464 A KR1020040015464 A KR 1020040015464A KR 20040015464 A KR20040015464 A KR 20040015464A KR 20050090206 A KR20050090206 A KR 20050090206A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B5/00—Rails; Guard rails; Distance-keeping means for them
- E01B5/18—Guard rails; Connecting, fastening or adjusting means therefor
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B5/00—Rails; Guard rails; Distance-keeping means for them
- E01B5/02—Rails
- E01B5/14—Rails for special parts of the track, e.g. for curves
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B9/00—Fastening rails on sleepers, or the like
- E01B9/60—Rail fastenings making use of clamps or braces supporting the side of the rail
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B2201/00—Fastening or restraining methods
- E01B2201/04—Fastening or restraining methods by bolting, nailing or the like
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- Mechanical Engineering (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Internal Circuitry In Semiconductor Integrated Circuit Devices (AREA)
- Electrodes Of Semiconductors (AREA)
Abstract
본 발명에 따른 반도체 소자의 콘택홀 형성 방법의 특징은, 반도체 기판 상부에 절연막을 형성하는 단계와, 반도체 기판의 소정영역을 노출시키는 콘택홀을 형성하는 단계와, 콘택홀을 포함한 전체 표면 상부에 금속 시드층을 증착하는 단계와, 상기 금속 시드층 상부에 Ti층 및 TiN층을 순차적으로 증착하는 단계와, 고온 급속 열처리 공정을 수행하여 상기 콘택홀 하부에 TiSi2를 형성하는 단계와, 상기 콘택홀을 매립하는 콘택플러그를 형성하는 단계를 포함하는 것을 특징으로 한다.A method of forming a contact hole in a semiconductor device according to the present invention includes forming an insulating film on a semiconductor substrate, forming a contact hole exposing a predetermined region of the semiconductor substrate, and forming a contact hole on an entire surface including the contact hole. Depositing a metal seed layer, sequentially depositing a Ti layer and a TiN layer on the metal seed layer, and performing a high temperature rapid heat treatment process to form TiSi 2 under the contact hole; And forming a contact plug to fill the hole.
본 발명에 따른 반도체 소자의 콘택홀 형성 방법은 ALD 공정 또는 스파터링 공정을 이용하여 Ti와 실리콘 사이에 Mo 또는 Pt 시드층을 추가 증착함으로써, 기존 방법으로 형성된 콘택보다 더 낮은 콘택 저항을 나타내고, 콘택 지름 감소에 의한 콘택 저항 상승 문제를 극복할 수 있는 효과가 있다. The method for forming a contact hole of a semiconductor device according to the present invention exhibits a lower contact resistance than a contact formed by a conventional method by further depositing a Mo or Pt seed layer between Ti and silicon using an ALD process or a sputtering process. There is an effect that can overcome the problem of increasing the contact resistance by reducing the diameter.
Description
본 발명은 반도체 소자의 콘택플러그 형성 방법에 관한 것으로, 특히 ALD 공정 또는 스파터링 공정을 이용하여 Ti층과 실리콘층 사이에 Mo 또는 Pt 시드층을 추가 증착함으로써, 기존 방법으로 형성된 콘택보다 더 낮은 콘택저항을 가지고, 콘택크기 감소에 의한 콘택저항 상승 문제를 극복하는 반도체 소자의 콘택플러그 형성 방법에 관한 것이다. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a contact plug of a semiconductor device, and in particular, a contact lower than a contact formed by a conventional method by further depositing a Mo or Pt seed layer between a Ti layer and a silicon layer using an ALD process or a sputtering process. The present invention relates to a method for forming a contact plug of a semiconductor device having a resistance and overcoming a problem of increasing contact resistance due to a decrease in contact size.
반도체 메모리 소자의 비트라인 콘택에서는 콘택저항을 낮추기 위해 콘택하부와 실리콘 기판의 계면에 TiSi2를 형성한다.In the bit line contact of the semiconductor memory device, TiSi 2 is formed at the interface between the contact lower portion and the silicon substrate in order to lower the contact resistance.
종래 기술에 따른 TiSi2 형성 방법에서는 Ti층을 콘택하부에 증착시켜 실리콘층과 물리적으로 접촉하게 한 다음 고온의 열처리를 통해 Ti층과 실리콘층을 반응시켜 최종적으로 TiSi2 를 형성시킨다.In the TiSi 2 formation method according to the prior art, the Ti layer is deposited under the contact to be in physical contact with the silicon layer, and then the Ti layer and the silicon layer are reacted through high temperature heat treatment to finally form TiSi 2 .
이때, TiSi2는 온도에 따라 두 단계의 변화를 거치게 되는데 낮은 온도에서는 비저항이 높은 C49상의 TiSi2가 생성되고 온도가 더 높아지면서 비저항이 낮은 C54상으로 상전이된다.At this time, TiSi 2 undergoes a two-step change depending on the temperature. At low temperatures, TiSi 2 having a high specific resistance is formed and TiSi 2 has a higher temperature, and the phase transitions to a C54 phase having a lower specific resistance.
C49상의 TiSi2에서 C54상의 TiSi2로의 상전이 온도는 TiSi2 콘택하부의 지름이 작아질수록 급격히 증가한다. 그러나 집적도 향상을 위해 콘택지름이 작아짐에따라 다른 조건이 일정하다면 콘택지름이 작아지면서 TiSi2 가 완전히 전이하지 못하여 콘택저항이 점차 증가되는 문제점이 있다.In the TiSi 2 phase transition temperature to the TiSi 2 on the C54 on C49 is the smaller the diameter of the TiSi 2 contacts the lower abruptly increases. However, if other conditions are constant as the contact diameter decreases to improve the integration degree, there is a problem in that the contact resistance decreases and the contact resistance gradually increases because TiSi 2 does not completely transition.
본 발명은 반도체 소자의 콘택플러그 형성 방법에 관한 것으로, 특히 ALD 공정 또는 스파터링 공정을 이용하여 Ti층과 실리콘층 사이에 Mo 또는 Pt 시드층을 추가 증착함으로써, 기존 방법으로 형성된 콘택보다 더 낮은 콘택저항을 나타내고, 콘택지름 감소에 의한 콘택저항 상승 문제를 극복하는 반도체 소자의 콘택플러그 형성 방법을 제공하는 것을 그 목적으로 한다. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a contact plug of a semiconductor device, and in particular, a contact lower than a contact formed by a conventional method by further depositing a Mo or Pt seed layer between a Ti layer and a silicon layer using an ALD process or a sputtering process. It is an object of the present invention to provide a method for forming a contact plug of a semiconductor device which exhibits resistance and overcomes a problem of increasing contact resistance due to a decrease in contact diameter.
본 발명은 상기와 같은 목적을 달성하기 위한 것으로서, 본 발명에 따른 반도체 소자의 콘택플러그 형성 방법의 특징은, 반도체 기판의 소정영역을 노출시키는 콘택홀을 형성하는 단계와,The present invention is to achieve the above object, a feature of the method for forming a contact plug of a semiconductor device according to the present invention, forming a contact hole for exposing a predetermined region of the semiconductor substrate,
콘택홀을 포함한 전체 표면 상부에 금속 시드층을 증착하는 단계와,Depositing a metal seed layer over the entire surface including the contact holes,
상기 금속 시드층 상부에 Ti층 및 TiN층을 순차적으로 증착하는 단계와,Sequentially depositing a Ti layer and a TiN layer on the metal seed layer;
고온 급속 열처리 공정을 수행하여 상기 콘택홀 하부에 TiSi2를 형성하는 단계와,Performing a high temperature rapid heat treatment process to form TiSi 2 under the contact hole;
상기 콘택홀을 매립하는 콘택플러그를 형성하는 단계Forming a contact plug to fill the contact hole
를 포함하는 것을 특징으로 한다.Characterized in that it comprises a.
이하에서는 본 발명의 실시예를 첨부한 도면을 참조하여 상세히 설명하기로 한다. Hereinafter, with reference to the accompanying drawings an embodiment of the present invention will be described in detail.
도 1a 내지 도 1f는 본 발명에 따른 반도체 소자의 콘택플러그 형성 방법의 구성 및 동작을 도시한 단면도이다. 1A to 1F are cross-sectional views illustrating the configuration and operation of a method for forming a contact plug of a semiconductor device according to the present invention.
도 1a를 참조하면, 반도체 기판(10)위에 절연막(20)을 형성한다. Referring to FIG. 1A, an insulating film 20 is formed on a semiconductor substrate 10.
도 1b를 참조하면, 반도체 기판(10)의 소정영역을 노출시키는 콘택홀(30)을 형성한다. Referring to FIG. 1B, a contact hole 30 exposing a predetermined region of the semiconductor substrate 10 is formed.
도 1c를 참조하면, 콘택홀(30)을 포함한 전체 표면 상부에 금속 시드층(40)을 증착한다. Referring to FIG. 1C, the metal seed layer 40 is deposited on the entire surface including the contact hole 30.
여기서, 금속 시드층(40)의 증착공정은 ALD 공정 또는 스파터링 공정을 이용하며, Mo 또는 Pt 시드층을 증착하는 것이 바람직하다. Here, the deposition process of the metal seed layer 40 uses an ALD process or a spattering process, and preferably deposits a Mo or Pt seed layer.
또한, ALD 공정을 이용하여 금속시드층(40)을 증착할때는 10 모노레이어 이하로 증착하고, 증착온도는 100∼400℃인 것이 바람직하다. In addition, when depositing the metal seed layer 40 using the ALD process, the deposition is performed at 10 monolayer or less, and the deposition temperature is preferably 100 to 400 ° C.
또한, 스파터링 공정을 이용하여 금속 시드층(40)을 증착 할 때는 금속 시드층(40)을 1∼20Å의 두께로 증착하는 것이 바람직하다. In addition, when depositing the metal seed layer 40 using a spattering process, it is preferable to deposit the metal seed layer 40 to a thickness of 1 to 20 kPa.
도 1d를 참조하면, 금속 시드층(40) 상부에 Ti층(50) 및 TiN층(60)을 순차적으로 증착한다. Referring to FIG. 1D, the Ti layer 50 and the TiN layer 60 are sequentially deposited on the metal seed layer 40.
이때, Ti층(50)의 두께는 50∼150Å로 하고, TiN층(60)의 두께는 100∼300Å으로 하는 것이 바람직하다. At this time, it is preferable that the thickness of the Ti layer 50 is 50-150 GPa, and the thickness of the TiN layer 60 is 100-300 GPa.
또한, 금속 시드층(40), Ti층(50) 및 TiN층(60)의 증착공정시 웨이퍼가 공기중에 노출되지 않도록 진공장비에서 연속적으로 진행하는 것이 바람직하다. In addition, during the deposition process of the metal seed layer 40, the Ti layer 50 and the TiN layer 60, it is preferable to proceed continuously in a vacuum equipment so that the wafer is not exposed to the air.
도 1e를 참조하면, 고온 급속 열처리 공정을 수행하여 콘택홀 하부에 TiSi2(70) 를 형성한다.Referring to FIG. 1E, a TiSi 2 70 is formed under the contact hole by performing a high temperature rapid heat treatment process. To form.
상기 고온 급속 열처리 공정은 700∼900℃의 온도에서 5초 내지 20초 동안 수행하는 것이 바람직하다. The high temperature rapid heat treatment process is preferably performed for 5 seconds to 20 seconds at a temperature of 700 ~ 900 ℃.
도 1f를 참조하면, 콘택홀(30)을 매립하는 도전층(미도시)을 형성하고 평탄화 식각하여 콘택플러그(80)를 형성한다. Referring to FIG. 1F, a conductive layer (not shown) filling the contact hole 30 is formed and planarized etch to form a contact plug 80.
여기서, 콘택플러그(80)는 텅스텐으로 형성하는 것이 바람직하다. Here, the contact plug 80 is preferably formed of tungsten.
본 발명에 따른 반도체 소자의 콘택플러그 형성 방법은 ALD 공정 또는 스파터링 공정을 이용하여 Ti층과 실리콘층 사이에 Mo 또는 Pt 시드층을 추가 증착함으로써, 기존 방법으로 형성된 콘택보다 더 낮은 콘택 저항을 나타내고, 콘택 지름 감소에 의한 콘택저항 상승 문제를 극복할 수 있는 효과가 있다. The method for forming a contact plug of a semiconductor device according to the present invention exhibits a lower contact resistance than a contact formed by a conventional method by further depositing a Mo or Pt seed layer between a Ti layer and a silicon layer using an ALD process or a sputtering process. In addition, there is an effect that can overcome the problem of contact resistance increase by reducing the contact diameter.
도 1a 내지 도 1f는 본 발명에 따른 반도체 소자의 콘택플러그 형성 방법을 도시한 단면도이다.1A to 1F are cross-sectional views illustrating a method for forming a contact plug of a semiconductor device according to the present invention.
< 도면의 주요 부분에 대한 부호의 설명 ><Description of Symbols for Main Parts of Drawings>
10 : 반도체 기판 20 : 절연막10 semiconductor substrate 20 insulating film
30 : 콘택홀 40 : 금속 시드층30 contact hole 40 metal seed layer
50 : Ti층 60 : TiN층50: Ti layer 60: TiN layer
70 : TiSi2층 80 : 콘택플러그70: TiSi 2 layer 80: contact plug
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100881512B1 (en) * | 2006-12-21 | 2009-02-05 | 동부일렉트로닉스 주식회사 | Method for fabricating semiconductor device |
KR101142333B1 (en) * | 2005-12-28 | 2012-05-17 | 에스케이하이닉스 주식회사 | Method for forming contact plug of semiconductor device |
US9842881B2 (en) | 2016-04-08 | 2017-12-12 | SK Hynix Inc. | Electronic device including metal-insulator-semiconductor structure and method for fabricating the same |
-
2004
- 2004-03-08 KR KR1020040015464A patent/KR20050090206A/en not_active Application Discontinuation
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101142333B1 (en) * | 2005-12-28 | 2012-05-17 | 에스케이하이닉스 주식회사 | Method for forming contact plug of semiconductor device |
KR100881512B1 (en) * | 2006-12-21 | 2009-02-05 | 동부일렉트로닉스 주식회사 | Method for fabricating semiconductor device |
US9842881B2 (en) | 2016-04-08 | 2017-12-12 | SK Hynix Inc. | Electronic device including metal-insulator-semiconductor structure and method for fabricating the same |
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