KR19990075643A - Method of forming an undoped silicon glass (USG) film - Google Patents
Method of forming an undoped silicon glass (USG) film Download PDFInfo
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- KR19990075643A KR19990075643A KR1019980009966A KR19980009966A KR19990075643A KR 19990075643 A KR19990075643 A KR 19990075643A KR 1019980009966 A KR1019980009966 A KR 1019980009966A KR 19980009966 A KR19980009966 A KR 19980009966A KR 19990075643 A KR19990075643 A KR 19990075643A
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- 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
- H01L21/70—Manufacture 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
- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
- H01L21/768—Applying interconnections to be used for carrying current between separate components within a device comprising conductors and dielectrics
- H01L21/76801—Applying 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
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- H—ELECTRICITY
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- 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
- H01L21/02104—Forming layers
- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02109—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates
- H01L21/02112—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer
- H01L21/02123—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer the material containing silicon
- H01L21/02126—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer the material containing silicon the material containing Si, O, and at least one of H, N, C, F, or other non-metal elements, e.g. SiOC, SiOC:H or SiONC
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- 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
- H01L21/02104—Forming layers
- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02225—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer
- H01L21/02227—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a process other than a deposition process
- H01L21/02255—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a process other than a deposition process formation by thermal treatment
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Abstract
실리콘 유리(USG)막의 형성방법을 개시한다. 이 방법은, 도전성 전극패턴이 형성된 반도체 기판을 준비하는 단계와, 상기 반도체 기판상에 친수성 하지막을 형성하는 단계와, 상기 친수성 하지막 상에 오존 및 TEOS를 반응챔버 내로 유입시키고 고온에서 반응시킴으로써 TEOS막을 형성하는 단계를 구비한다.A method of forming a silicon glass (USG) film is disclosed. The method comprises the steps of preparing a semiconductor substrate on which a conductive electrode pattern is formed, forming a hydrophilic underlayer on the semiconductor substrate, and introducing ozone and TEOS into the reaction chamber on the hydrophilic underlayer and reacting at a high temperature. Forming a film.
Description
본 발명은 반도체 소자의 층간절연막 형성방법에 관한 것으로서, 상세하게는 오존(O3) 및 TEOS(Tetra Ethyl Ortho Silicate)를 이용하여 형성되는 도핑되지 않은 실리콘 유리(Undoped Silicon Glass; 이하 USG라 함))막의 형성방법에 관한 것이다.The present invention relates to a method of forming an interlayer insulating film of a semiconductor device, particularly, ozone (O 3) and TEOS (Tetra Ethyl Ortho Silicate) undoped silicon glass is formed by using a (Undoped Silicon Glass; hereinafter referred to as USG) The present invention relates to a method of forming a film.
반도체 장치가 급격히 고집적화됨에 따라, 제한된 면적에 다층 구조를 형성하는 고집적화 기술이 개발되고 있다. 이와 같이 다층 구조가 반도체 장치에 도입됨에 따라 그 단차가 증가되고 있다. 이러한 단차의 증가를 극복하기 위해서는, 우수한 평탄도를 구현할 수 있는 층간절연막 형성방법의 개발이 요구되고 있다.As semiconductor devices are rapidly becoming highly integrated, a high integration technology for forming a multilayer structure in a limited area has been developed. As the multilayer structure is introduced into the semiconductor device as described above, the step increases. In order to overcome such an increase in the level, it is required to develop a method of forming an interlayer insulating film capable of realizing excellent flatness.
우수한 평탄도를 구현할 수 있는 층간 절연막으로, USG막이 제안되고 있다. 이러한 USG막 중 특히, TEOS를 이용하여 형성되는 산화막(이하 TEOS막이라 한다)이 주목받고 있다.As an interlayer insulating film capable of realizing excellent flatness, a USG film has been proposed. Of these USG films, in particular, an oxide film (hereinafter referred to as TEOS film) formed by using TEOS has attracted attention.
TEOS막은 주로 오존 및 TEOS가 반응하여 형성된다. 이러한 TEOS막은, SiH4를 플라즈마 상태로 여기시켜 반응시킴으로써 형성되는 산화막에 비해 우수한 평탄도를 얻을 수 있다.The TEOS film is formed mainly by reaction of ozone and TEOS. This TEOS film, an SiH 4 to excite into a plasma state can be obtained an excellent flatness as compared to the oxide film formed by the reaction.
그러나 TEOS막은 하지막의 막질에 따라 그 증착 속도(deposition rate)가 감소되고, 거칠기(roughness)가 증가하는 등의 하지막 의존성(under layer dependence)을 갖는다. 즉, 하지막이 친수성인 고온산화막(High Temperature Oxide; 이하 HTO라 함)이나 열산화막이고, 이 친수성 하지막 상에 TEOS막을 형성하게 되면, 그 상반된 특성으로 인하여 TEOS 막의 표면이 매우 거칠고, 증착두께도 목표두께(target thickness)가 되지 않기 때문에 실제 소자에 적용하는 것이 곤란하다. 이를 개선하기 위해서, 종래에는 친수성인 HTO나 열산화막의 표면을 플라즈마 처리하여 소수성으로 변화시킨 후 TEOS막을 형성한다. 그러나 이 방법은 플라즈마 처리 공정이 추가되기 때문에 공정이 복잡하고 반도체 소자의 생산원가가 높아지는 문제점이 있다.However, the TEOS film has under layer dependence such as the deposition rate decreases and the roughness increases depending on the film quality of the underlayer. That is, if the underlying film is a hydrophilic high temperature oxide (HTO) or a thermal oxide film, and the TEOS film is formed on the hydrophilic underlayer, the surface of the TEOS film is very rough due to its opposite characteristics, and the deposition thickness is also high. It is difficult to apply it to an actual element because it does not become a target thickness. In order to improve this, conventionally, the surface of the hydrophilic HTO or thermal oxide film is changed to hydrophobicity by plasma treatment to form a TEOS film. However, this method has a problem that the process is complicated and the production cost of the semiconductor device is increased because the plasma treatment process is added.
본 발명은 상기와 같은 문제점을 해결하기 위하여 안출된 것으로서, 플라즈마 처리공정의 추가없이 하지막 의존성을 줄일 수 있는 USG막의 형성방법을 제공하는데 그 목적이 있다.The present invention has been made to solve the above problems, and an object thereof is to provide a method of forming a USG film which can reduce the dependence of the underlying film without the addition of a plasma treatment step.
도 1과 도 2는 본 발명에 따라 도핑되지 않은 실리콘 유리(USG)막을 형성하는 방법을 단계적으로 나타내는 단면도이다.1 and 2 are cross-sectional views illustrating a method of forming an undoped silicon glass (USG) film according to the present invention.
<도면의 주요부분에 대한 부호의 설명><Description of the symbols for the main parts of the drawings>
10:반도체 기판 14:도전성 전극패턴10: semiconductor substrate 14: conductive electrode pattern
22:친수성 하지막 24:TEOS막22: hydrophilic underlayer 24: TEOS membrane
상기 목적을 달성하기 위한 본 발명의 도핑되지 않은 실리콘 유리(USG)막의 형성방법은, 도전성 전극패턴이 형성된 반도체 기판을 준비하는 단계와, 상기 반도체 기판상에 친수성 하지막을 형성하는 단계와, 상기 친수성 하지막 상에 오존 및 TEOS를 반응챔버 내로 유입시키고 고온에서 반응시킴으로써 TEOS막을 형성하는 단계를 구비한다.The method of forming an undoped silicon glass (USG) film of the present invention for achieving the above object comprises the steps of preparing a semiconductor substrate having a conductive electrode pattern, forming a hydrophilic underlayer on the semiconductor substrate, the hydrophilic Forming a TEOS film by introducing ozone and TEOS into the reaction chamber on the underlying film and reacting at a high temperature.
상기 친수성 하지막은 열산화막, 고온산화막, PE-SiH4막, PE-TEOS막 및 BPSG(Boron Phosphorus Silicate Glass)막으로 이루어지는 군에서 선택되는 어느 하나의 막인 것이 바람직하다.The hydrophilic underlayer is preferably any one selected from the group consisting of a thermal oxide film, a high temperature oxide film, a PE-SiH4 film, a PE-TEOS film, and a BPSG (Boron Phosphorus Silicate Glass) film.
상기 오존 및 TEOS의 반응온도는 470-550℃이며, 상기 오존 가스와 상기 TEOS 가스의 유량은 모두 35-40slm인 것이 바람직하다.The reaction temperature of the ozone and TEOS is 470-550 ℃, the flow rate of both the ozone gas and the TEOS gas is preferably 35-40 slm.
상기 오존 가스와 가 상기 TEOS 가스가 반응챔버 내로 원활하게 유입되도록 하기 위하여 상기 오존 가스와 상기 TEOS 가스는 각각 운반가스와 한께 상기 반응챔버 내로 유입되는 것이 바람직하다.In order to smoothly flow the ozone gas and the TEOS gas into the reaction chamber, the ozone gas and the TEOS gas are preferably introduced into the reaction chamber together with the carrier gas.
상기 운반가스는 질소 가스인 것이 바람직하다.The carrier gas is preferably nitrogen gas.
이와 같은 본 발명에 따른 USG막의 형성방법은, 별도의 플라즈마 처리공정을 거치지 않더라도 우수한 표면 거칠기 및 양호한 단차도포특성을 갖는 TEOS막을 형성하는 것이 가능하다. 따라서, 층간절연막을 형성하거나, 종횡비가 큰 콘택홀을 채우거나 또는 깊은 트렌치를 채우는 공정에 적용될 수 있는 본 발명에 따른 USG막의 형성방법은 공정을 단순화시켜 반도체 소자의 제조시간 및 원가를 낮출 수 있다.Such a method of forming a USG film according to the present invention can form a TEOS film having excellent surface roughness and good step application characteristics without undergoing a separate plasma treatment step. Accordingly, the method of forming the USG film according to the present invention, which can be applied to a process of forming an interlayer insulating film, filling a contact hole having a high aspect ratio, or filling a deep trench, can simplify the process and lower the manufacturing time and cost of the semiconductor device. .
이하, 첨부된 도면을 참조하여 본 발명에 따른 바람직한 실시예를 상세히 설명한다. 그러나 본 발명이 하기 실시예에 국한되는 것으로 해석되어져서는 안된다. 또한, 도면에서 층이나 영역들의 두께는 설명을 명확하게 하기 위하여 과장된 것이다. 도면에서 동일한 참조부호는 동일한 구성요소를 나타낸다. 또한 어떤 층이 다른 층 또는 기판의 "상부"에 있다고 기재된 경우, 상기 어떤 층이 상기 다른 층 또는 기판의 상부에 직접 접촉하면서 존재할 수도 있고, 그 사이에 다른 제3의 층이 개재될 수도 있다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention should not be construed as limited to the following examples. In the drawings, the thicknesses of layers or regions are exaggerated for clarity. Like reference numerals in the drawings denote like elements. In addition, where a layer is described as being on the "top" of another layer or substrate, the layer may be present in direct contact with the top of the other layer or substrate, with another third layer interposed therebetween.
도 1은 전극패턴이 형성된 반도체 기판을 나타내는 단면도이다.1 is a cross-sectional view illustrating a semiconductor substrate on which electrode patterns are formed.
도 1을 참조하면, 먼저 반도체 기판(10) 상에 통상의 방법으로 게이트전극 또는 금속배선과 같은 도전성 전극패턴(14)을 형성한다.Referring to FIG. 1, first, a conductive electrode pattern 14 such as a gate electrode or a metal wiring is formed on a semiconductor substrate 10 by a conventional method.
여기서, 하부전극(14)이 금속배선인 경우에는, 예를 들면 텅스텐층, 알루미늄층, 구리층 등과 같은 적당한 금속층을 상기 반도체 기판(10) 상에 형성한 후, 이어서, 상기 금속층을 통상의 방법으로 패터닝하여 상기 반도체 기판(10)의 소정영역 상에 전극패턴(14)을 형성한다. 한편, 하부전극(14)이 게이트전극인 경우에는, 폴리실리콘층과 같은 적당한 도전층을 상기 반도체 기판(10) 상에 형성한 후, 이어서, 상기 폴리실리콘층을 통상의 방법으로 패터닝하여 상기 반도체 기판(10)의 소정영역 상에 전극패턴(14)을 형성한다. 이때, 상기 반도체 기판 상에는 반도체 소자를 제조하기 위하여 소자분리 영역(미도시)에 의해 분리되는 활성영역들(미도시)이 정의되어 있을 수 있다. 여기서, 소자분리 영역은 통상의 선택적 산화에 의한 소자분리 방법 또는 트렌치를 이용한 소자분리 방법중 어느 것을 사용하여 형성되더라도 무방하다. 상기 반도체 기판(10)과 도전성 전극패턴(14) 사이에는 절연을 위하여 산화막과 같은 통상의 절연층(12)이 개재될 수 있다.Here, in the case where the lower electrode 14 is a metal wiring, a suitable metal layer, for example, a tungsten layer, an aluminum layer, a copper layer, or the like is formed on the semiconductor substrate 10, and then the metal layer is formed in a conventional method. The electrode pattern 14 is formed on the predetermined region of the semiconductor substrate 10 by patterning. On the other hand, when the lower electrode 14 is a gate electrode, a suitable conductive layer such as a polysilicon layer is formed on the semiconductor substrate 10, and then the polysilicon layer is patterned by a conventional method to form the semiconductor. The electrode pattern 14 is formed on a predetermined region of the substrate 10. In this case, active regions (not shown) separated by an isolation region (not shown) may be defined on the semiconductor substrate to manufacture a semiconductor device. Here, the device isolation region may be formed using any of the device isolation method by a conventional selective oxidation or the device isolation method using a trench. A normal insulating layer 12 such as an oxide film may be interposed between the semiconductor substrate 10 and the conductive electrode pattern 14 to insulate the semiconductor substrate 10 and the conductive electrode pattern 14.
도 2는 도 1의 결과물 상에 하지막과 TEOS막이 차례로 형성된 것을 나타내는 단면도이다.FIG. 2 is a cross-sectional view illustrating that a base film and a TEOS film are sequentially formed on the resultant product of FIG. 1.
도 2를 참조하면, 도전성 전극패턴(14)이 형성된 상기 결과물 상에 하지막(22)으로 절연특성을 갖는 친수성의 물질막, 예를 들면 열산화막(thermal oxide), HTO막, PE-SiH4(Plasma Enhanced SiH4)막, PE-TEOS(Plasma Enhanced Tetra Ethyl Ortho Silicate)막 및 BPSG(Boron Phosphorus Silicate Glass)막을 형성한다.Referring to FIG. 2, a hydrophilic material film having an insulating property, for example, a thermal oxide film, an HTO film, and a PE-SiH 4 layer, has an insulating property on the resultant film 22 on which the conductive electrode pattern 14 is formed. (Plasma Enhanced SiH 4 ) film, PE-TEOS (Plasma Enhanced Tetra Ethyl Ortho Silicate) film and BPSG (Boron Phosphorus Silicate Glass) film are formed.
이어서, 하지막(22)이 형성된 상기 반도체 기판(10)을 반응챔버(미도시) 내에 로딩시킨다. 그리고 상기 반도체 기판(10)의 전면에 오존 및 TEOS를 소스 가스로 이용하여 TEOS막(24)을 형성한다.Subsequently, the semiconductor substrate 10 on which the underlayer 22 is formed is loaded into a reaction chamber (not shown). The TEOS film 24 is formed on the entire surface of the semiconductor substrate 10 using ozone and TEOS as the source gas.
TEOS막(24)의 하지막 의존성은 반응챔버 내의 오존의 농도에 비례한다. 그런데, 반응온도가 고온일 때에는 오존의 분해가 빠르고 따라서 오존의 농도가 낮아지기 때문에 오존의 반응성이 떨어진다. 그 결과, TEOS막(24) 내의 "-OH" 결합이 많아지게 되며, 이는 친수성의 하지막(22) 상에 TEOS막(24)이 보다 쉽게 형성되도록 함으로써 하지막 의존성이 줄어든다. 따라서, 상기 TEOS막의 형성은 고온에서 이루어지는 것이 바람직하다. 본 발명에 있어서, 오존 및 TEOS는 470℃ 이상의 온도에서 반응이 일어나도록 하였으며, 바람직한 반응온도는 470-550℃이다. 소스가스 즉, 오존과 TEOS은 모두 35-40slm(square liter per minute)의 유량으로 반응챔버 내에 유입되도록 하였는데, 바람직한 유량은 37slm이다. 상기 소스가스의 흐름을 원활히하기 위하여 질소를 캐리어가스로 이용하였다.The underlying film dependency of the TEOS film 24 is proportional to the concentration of ozone in the reaction chamber. By the way, when the reaction temperature is high, ozone decomposes quickly, and thus the concentration of ozone decreases, so that the reactivity of ozone decreases. As a result, there are more "-OH" bonds in the TEOS film 24, which makes the TEOS film 24 more easily formed on the hydrophilic base film 22, thereby reducing the underlying film dependency. Therefore, the TEOS film is preferably formed at a high temperature. In the present invention, ozone and TEOS was allowed to react at a temperature of 470 ℃ or higher, the preferred reaction temperature is 470-550 ℃. Both source gas, ozone and TEOS were allowed to flow into the reaction chamber at a flow rate of 35-40 slm (square liter per minute), with a preferred flow rate of 37 slm. In order to facilitate the flow of the source gas, nitrogen was used as a carrier gas.
본 출원인이 주사전자현미경(SEM) 사진(미도시)으로 확인한 결과, 저온(대략 450℃ 이하)에서 TEOS막을 형성하는 종래의 방법에 따라 형성된 TEOS막에 비하여 본 발명에 따라 형성된 TEOS막은 그 표면 거칠기가 매우 우수하고 양호한 단차도포특성을 갖는다는 것을 확인하였다. 따라서, 본 발명의 TEOS막 형성방법은, 양호한 단차도포특성을 얻기 위하여 종래의 방법에서 사용하는 별도의 플라스마 처리공정을 요하지 않는다는 것을 알 수 있다.Applicant confirmed by scanning electron microscopy (SEM) photograph (not shown), the TEOS film formed according to the present invention compared to the TEOS film formed according to the conventional method of forming a TEOS film at a low temperature (about 450 ℃ or less), the surface roughness It was confirmed that is very excellent and has a good step application characteristics. Therefore, it can be seen that the TEOS film forming method of the present invention does not require a separate plasma treatment step used in the conventional method in order to obtain good step application characteristics.
이와 같이 우수한 표면 거칠기 및 양호한 단차도포특성을 갖는 본 발명의 TEOS막 형성방법은 상기의 층간절연막 형성에만 적용되는 것은 아니며, 예를 들면 종횡비가 큰 콘택홀을 채우거나, 또는 깊은 트렌치(trench)를 채우는 경우에도 적용할 수 있다는 것은 당업자에게 명백하다.The TEOS film forming method of the present invention having such excellent surface roughness and good step coating characteristics is not only applied to the formation of the above interlayer insulating film, but for example, fills contact holes having a high aspect ratio or deep trenches. It is apparent to those skilled in the art that the present invention can be applied even when filled.
이상 실시예를 들어 본 발명에 대해 설명하였으나, 본발명은 상술한 실시예에 한정되는 것은 아니며, 단지 본 실시예들은 본 발명의 개시가 완전하도록 하며, 통상의 지식을 가진 자에게 발명의 범주를 완전하게 알려주기 위하여 제공되는 것으로서, 본 발명의 기술사상 및 범위내에서 당 분야의 통상의 지식을 가진 자에 의하여 각종 변형 및 개량이 가능함은 명백하다.Although the present invention has been described with reference to the above embodiments, the present invention is not limited to the above-described embodiments, only these embodiments are intended to complete the disclosure of the present invention, and the scope of the invention to those skilled in the art. It is apparent that various modifications and improvements are possible to those skilled in the art without departing from the spirit and scope of the present invention as provided to fully inform the present invention.
이상에서 살펴본 바와 같이 본 발명에 따른 USG막의 형성방법은, 별도의 플라즈마 처리공정을 거치지 않더라도 우수한 표면 거칠기 및 양호한 단차도포특성을 갖는 TEOS막을 형성하는 것이 가능하다. 따라서, 층간절연막을 형성하거나, 종횡비가 큰 콘택홀을 채우거나 또는 깊은 트렌치를 채우는 공정에 적용될 수 있는 본 발명에 따른 USG막의 형성방법은 공정을 단순화시켜 반도체 소자의 제조시간 및 원가를 낮출 수 있다.As described above, the method for forming the USG film according to the present invention can form a TEOS film having excellent surface roughness and good step application characteristics without undergoing a separate plasma treatment process. Accordingly, the method of forming the USG film according to the present invention, which can be applied to a process of forming an interlayer insulating film, filling a contact hole having a high aspect ratio, or filling a deep trench, can simplify the process and lower the manufacturing time and cost of the semiconductor device. .
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