KR20040059375A - Size reduction method of nor flash cell array by using self aligned contact - Google Patents
Size reduction method of nor flash cell array by using self aligned contact Download PDFInfo
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- KR20040059375A KR20040059375A KR1020020085990A KR20020085990A KR20040059375A KR 20040059375 A KR20040059375 A KR 20040059375A KR 1020020085990 A KR1020020085990 A KR 1020020085990A KR 20020085990 A KR20020085990 A KR 20020085990A KR 20040059375 A KR20040059375 A KR 20040059375A
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- H10B—ELECTRONIC MEMORY DEVICES
- H10B41/00—Electrically erasable-and-programmable ROM [EEPROM] devices comprising floating gates
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- 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
- H01L21/76897—Formation of self-aligned vias or contact plugs, i.e. involving a lithographically uncritical step
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- H10B41/00—Electrically erasable-and-programmable ROM [EEPROM] devices comprising floating gates
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Abstract
본 발명은 자기정렬 컨택(self aligned contact; SAC) 공정을 사용함으로써 셀 게이트의 디자인, 특히 소오스 영역의 것을 굴곡이 아닌 직선으로 만들 수 있음으로 인하여 게이트대 게이트간(gate to gate spacing)의 간격을 최소까지 줄일 수 있는 자기 정렬 컨택을 이용한 노아(NOR) 플래시 셀 어레이의 사이즈 축소 방법을 제공하는 것이다. NOR 플래시 셀 어레이의 사이즈 축소 방법은 소오스, 드레인, 정션등의 소정의 하부구조가 형성된 기판 상에 게이트를 형성하는 단계와, 게이트 상에 산화막과 층간 절연막을 순차적으로 형성하는 단계와, 정션을 노출할 수 있도록 컨택 마스크를 정렬하는 단계와, 컨택 마스크를 이용하여 층간 절연막과 산화막을 자기정렬 컨택방식으로 식각을 하여 정션을 노출시키는 컨택홀을 형성하는 단계를 포함한다.The present invention uses a self aligned contact (SAC) process to reduce the gate to gate spacing spacing because the cell gate design can be made straight, rather than curved, in the source region. The present invention provides a method of reducing the size of a NOR flash cell array using a self-aligned contact that can be reduced to a minimum. The size reduction method of the NOR flash cell array includes forming a gate on a substrate on which a predetermined substructure such as a source, a drain, and a junction is formed, sequentially forming an oxide film and an interlayer insulating film on the gate, and exposing the junction. And arranging the contact masks to form contact holes, and forming contact holes exposing the junctions by etching the interlayer insulating film and the oxide film using a self-aligned contact method using the contact mask.
Description
본 발명은 반도체 소자의 제조 방법에 관한 것으로서, 보다 상세하게는, 0.25 ㎛ 이상의 소자에서 컨택 형성시 사용되고 있는 사용되고 있는 자기정렬 컨택(self aligned contact; SAC) 방식을 이용하고 NOR 플래시의 게이트 디자인을 일부 변경해서 셀사이즈를 줄이기 위한 SAC를 이용한 NOR 플래시 셀 어레이의 사이즈 축소 방법에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a semiconductor device, and more particularly, to a part of a gate design of a NOR flash using a self-aligned contact (SAC) method, which is used in forming a contact in an element of 0.25 μm or more. The present invention relates to a method for reducing the size of a NOR flash cell array using SAC to reduce the cell size by changing.
일반적으로, 종래의 플래시 메모리는 크게 두 가지 유형으로 나누어지는 데 이는 NOR형과 NAND형으로 나누어지는 것이다. 이러한 유형의 커다란 차이점은 작동원리가 상이한 것에 기인하는 셀의 디자인으로부터 발생된다. 즉, NOR형의 컨택 형성은 드레인 액티브마다, 그리고 소오스에도 컨택이 뚫리게 되어 있다.In general, the conventional flash memory is divided into two types, which are divided into NOR type and NAND type. The big difference of this type arises from the design of the cell due to the different principle of operation. That is, in the NOR-type contact formation, the contact is made to pass through the drain active and the source.
도 1은 종래 기술에 따라 형성된 NOR형 셀 구조를 도시한 평면도이다.1 is a plan view showing a NOR cell structure formed according to the prior art.
도 1에 도시한 바와 같이, NOR형 셀 구조에서는 컨택 형성이 드레인 액티브마다 드레인 컨택(Dc)이 뚫려 있으며, 그리고 소오스에도 소오스 컨택(Sc)이 뚫리게 되어 있다. IF5 S3-Family Flash 제품을 기준으로 예를 들면, 최소 게이트 간격은 0.30 ㎛로 되어 있는데, 실제 도 1에서 알 수 있는 바와 같이 소오스 영역의 게이트대 게이트 간격은 0.30 ㎛로 디자인되어 있다.As shown in FIG. 1, in the NOR cell structure, the contact contact is formed through the drain contact Dc for each drain active, and the source contact Sc is also drilled through the source. For example, based on the IF5 S3-Family Flash product, the minimum gate spacing is 0.30 mu m. In fact, as shown in FIG. 1, the gate-to-gate spacing of the source region is designed to be 0.30 mu m.
따라서, NOR형의 플래시 메모리는 빠른 랜덤액세스 시간(fast access time), 섹터 소거(sector erase) 등과 같은 장점을 갖고 있음에도 불구하고, 전술한 컨택 형성으로 인해 셀 사이즈를 줄이는데 커다란 어려움이 있다.Therefore, the NOR-type flash memory has a great difficulty in reducing the cell size due to the above-described contact formation, although it has advantages such as fast random access time and sector erase.
셀 사이즈를 줄이지 못함으로 인하여 실제 유효한 다이(die)의 개수가 줄어들고, 이로 인하여 수율(yield) 관리에 문제가 발생되며 비용절감이 원활하지 못한 문제점을 수반하게 된다.Failure to reduce the cell size reduces the actual number of dies, which leads to problems in yield management and incurs cost savings.
본 발명은 상기와 같은 문제점을 해결하기 위해 창작된 것으로서, 본 발명의 주목적은 SAC 공정을 사용함으로써 셀 게이트의 디자인, 특히 소오스 영역의 것을 굴곡이 아닌 직선으로 만들 수 있음으로 인하여 게이트 대 게이트간(gate to gate spacing)의 간격을 최소까지 줄일 수 있는 자기 정렬 컨택을 이용한 노아 플래시 셀 어레이의 사이즈 축소 방법을 제공하는 것이다.The present invention has been made to solve the above problems, and the main purpose of the present invention is to use the SAC process to design the gate of the cell gate, especially the source region, because it is possible to make a straight line rather than bend between gate-to-gate ( The present invention provides a method of reducing the size of a NOR flash cell array using a self-aligned contact that can reduce the spacing of gate to gate spacing to a minimum.
도 1은 종래 기술에 따라 형성된 NOR형 셀 구조를 도시한 평면도이다.1 is a plan view showing a NOR cell structure formed according to the prior art.
도 2a 내지 도 2d는 본 발명의 바람직한 실시예에 따라 자기 정렬 컨택을 이용한 NOR 플래시 셀 어레이의 사이즈 축소 방법을 순차적으로 도시한 단면도들이다.2A through 2D are cross-sectional views sequentially illustrating a size reduction method of a NOR flash cell array using a self-aligned contact according to a preferred embodiment of the present invention.
도 3은 본 발명의 바람직한 실시예에 따라 자기정렬 컨택을 이용하여 축소된 NOR 플래시 셀 어레이를 도시한 평면도이다.3 is a plan view illustrating a reduced NOR flash cell array using self-aligned contacts in accordance with a preferred embodiment of the present invention.
- 도면의 주요부분에 대한 부호의 설명 --Explanation of symbols for the main parts of the drawings-
100 : 반도체 기판 102 : 3중 N웰100 semiconductor substrate 102 triple N well
104 : P웰 106 : 드레인 정션104: P well 106: drain junction
107 : 소오스 정션 108 : 게이트107 Source Junction 108 Gate
110 : 측벽 스페이서 112 : 장벽층110 sidewall spacer 112 barrier layer
114 : 층간 절연막 116 : 컨택 마스크114: interlayer insulating film 116: contact mask
118 : 컨택홀118: contact hole
상기와 같은 목적을 실현하기 위한 본 발명은 소오스, 드레인, 정션등의 소정의 하부구조가 형성된 기판 상에 게이트를 형성하는 단계와, 상기 게이트 상에 산화막과 층간 절연막을 순차적으로 형성하는 단계와, 상기 정션을 노출할 수 있도록 컨택 마스크를 정렬하는 단계와, 상기 컨택 마스크를 이용하여 상기 층간 절연막과 상기 산화막을 자기정렬 컨택 방식으로 식각을 하여 상기 정션을 노출시키는컨택홀을 형성하는 단계를 포함하는 것을 특징으로 하는 자기 정렬 컨택을 이용한 노아(NOR) 플래시 셀 어레이의 사이즈 축소 방법을 제공한다.The present invention for realizing the above object comprises the steps of forming a gate on a substrate formed with a predetermined substructure, such as source, drain, junction, forming an oxide film and an interlayer insulating film on the gate sequentially; Arranging a contact mask to expose the junction, and forming a contact hole exposing the junction by etching the interlayer insulating layer and the oxide layer using a self-aligned contact method using the contact mask. A method of reducing the size of a NOR flash cell array using a self-aligned contact is provided.
이하, 본 발명의 바람직한 실시예를 첨부된 도면을 참조하여 설명한다. 또한 본 실시예는 본 발명의 권리범위를 한정하는 것은 아니고, 단지 예시로 제시된 것이다.Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings. In addition, this embodiment is not intended to limit the scope of the present invention, but is presented by way of example only.
도 2 내지 도 3은 본 발명의 바람직한 실시예에 따른 자기 정렬 컨택을 이용한 NOR 플래시 셀 어레이의 사이즈 축소 방법을 설명하기 위하여 도시된 단면도 및 평면도들이다.2 to 3 are cross-sectional views and plan views illustrating a method of reducing the size of a NOR flash cell array using a self-aligned contact according to a preferred embodiment of the present invention.
도 2a 내지 도 2d는 본 발명의 바람직한 실시예에 따른 자기 정렬 컨택을 이용한 NOR 플래시 셀 어레이의 사이즈 축소 방법을 순차적으로 도시한 단면도들이다.2A through 2D are cross-sectional views sequentially illustrating a size reduction method of a NOR flash cell array using a self-aligned contact according to a preferred embodiment of the present invention.
도 2a는 종래의 자기 정렬 컨택을 이용한 노아 플래시 셀 어레이의 제조방법으로 형성된 셀 어레이를 도시한 도 1의 선분 I-I을 따라서 절개한 단면도이다.FIG. 2A is a cross-sectional view taken along line segment I-I of FIG. 1 illustrating a cell array formed by a method of manufacturing a Noah flash cell array using a conventional self-aligned contact.
먼저, 도 2a에 도시된 바와 같이, NOR 플래시의 컨택 형성이전까지의 공정은 종래의 방법과 동일하다. 즉, 3중 N 웰(102), P 웰(104), 다수의 드레인 정션(106) 및 다수의 소오스 정션(107)을 구비하는 반도체 기판(100) 상에 게이트(108)를 형성한다. 게이트(108)을 형성하는 공정은 터널 산화막, 제 1 폴리층, ONO(SiO2/Si3N4/SiO2), 제 2 폴리층 및 보호 폴리층을 형성하는 공정을 포함한다.이어서, 게이트(108) 측면에 측벽 스페이서(110)을 형성한다. 그리고 나서, 실리콘 질화막을 형성한 후 산화공정을 실행하여 장벽층(112)을 형성한다. 그리고, 장벽층(112)상에 층간 절연막(114)을 증착하여 형성한 후 평탄화 공정을 실행함으로써, 평탄화된 층간 절연막(114)을 얻는다.First, as shown in Figure 2a, the process up to contact formation of the NOR flash is the same as the conventional method. That is, the gate 108 is formed on the semiconductor substrate 100 having the triple N well 102, the P well 104, the plurality of drain junctions 106, and the plurality of source junctions 107. The process of forming the gate 108 includes forming a tunnel oxide film, a first poly layer, an ONO (SiO 2 / Si 3 N 4 / SiO 2 ), a second poly layer, and a protective poly layer. Sidewall spacers 110 are formed on the sidewalls 108. Thereafter, after forming the silicon nitride film, an oxidation process is performed to form the barrier layer 112. The planarization interlayer insulating film 114 is obtained by depositing and forming the interlayer insulating film 114 on the barrier layer 112 and then performing the planarization process.
이어서, 도 2b에 도시된 바와 같이, 드레인 정션(106)을 노출시킬 수 있도록 평탄화된 층간 절연막(114) 상에 컨택 마스크(116)를 형성한다.Next, as shown in FIG. 2B, a contact mask 116 is formed on the planarized interlayer insulating layer 114 to expose the drain junction 106.
그리고 나서, 도 2c에 도시된 바와 같이, 컨택 마스크(116)를 이용하여 층간 절연막(114), 장벽층(112)등을 자기정렬 컨택 방식으로 식각하여 드레인 정션(106) 상에 위치한 부분들을 제거한다.Then, as shown in FIG. 2C, the interlayer insulating layer 114, the barrier layer 112, and the like are etched using the contact mask 116 in a self-aligned contact manner to remove portions located on the drain junction 106. do.
마지막으로, 도 2d에 도시한 바와 같이, 컨택 마스크(116)을 제거함으로써, 컨택홀(118)을 형성하여 자기 정렬 컨택을 이용하여 축소된 NOR 플래시 셀 어레이를 얻을 수 있다.Finally, as shown in FIG. 2D, by removing the contact mask 116, the contact hole 118 may be formed to obtain a reduced NOR flash cell array using self aligned contacts.
도 3은 본 발명의 바람직한 실시예에 따른 자기정렬 컨택을 이용하여 축소된 NOR 플래시 셀 어레이를 도시한 평면도이다.3 is a plan view illustrating a reduced NOR flash cell array using a self-aligned contact according to a preferred embodiment of the present invention.
도 3에 도시된 본 발명의 자기정렬 컨택을 이용하여 축소된 NOR 플래시 셀 어레이와 도 1에 도시된 종래 기술에 따라 형성된 NOR형 셀 구조를 비교하면 셀 사이즈가 상당히 감소되었음을 알 수 있다. 본 발명의 바람직한 실시예에 따르면, 게이트를 형성하는 단계에서, 소오스 영역의 게이트를 굴곡이 아닌 직선형태로 형성하는 것을 특징으로 한다. 따라서, 본 발명은 소오스 영역의 게이트가 직선 형태를 이룸으로써 소오스 액티브 폭이 축소된다.Comparing the reduced NOR flash cell array using the self-aligned contacts of the present invention shown in FIG. 3 with the NOR cell structure formed according to the prior art shown in FIG. 1, it can be seen that the cell size is significantly reduced. According to a preferred embodiment of the present invention, in the forming of the gate, the gate of the source region is formed in a straight line instead of bending. Therefore, in the present invention, the source active width is reduced because the gates of the source regions form a straight line.
상기한 바와 같이 본 발명은 소오스 영역의 게이트를 직선으로 형성함으로 인하여 레이아웃 디자인 룰(layout design rule)에 대하여 게이트 대 게이트의 최소 간격(gate to gate space minimum size)로 게이트를 형성할 수 있는 효과가 있다.As described above, the present invention has an effect of forming a gate at a gate to gate space minimum size with respect to the layout design rule by forming the gate of the source region in a straight line. have.
따라서, 이러한 소오스 지역의 액티브 폭도 같이 줄일 수 있게되며, 결국 이러한 장점들은 셀 사이즈를 줄이는데 크게 기여하게 된다.Therefore, the active width of the source region can be reduced as well, and these advantages contribute greatly to reducing the cell size.
또한, 셀 사이즈가 줄어든 다는 것은 실제의 다이(net die)의 개수가 늘어나게 되고, 이러한 결과로서 수율(yield) 관리가 용이하고 비용이 감소되는 효과가 있게 된다.In addition, decreasing the cell size increases the number of actual dies, and as a result, yield management is easy and cost is reduced.
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| KR100976684B1 (en) * | 2008-08-01 | 2010-08-18 | 주식회사 하이닉스반도체 | Contact hole formation method of semiconductor memory device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR100275735B1 (en) * | 1998-07-11 | 2000-12-15 | 윤종용 | Method for manufacturing nor-type flash memory device |
| KR20020057769A (en) * | 2001-01-06 | 2002-07-12 | 윤종용 | Method for fabricating semiconductor device having self-aligned contact pad |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100976684B1 (en) * | 2008-08-01 | 2010-08-18 | 주식회사 하이닉스반도체 | Contact hole formation method of semiconductor memory device |
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| KR100944665B1 (en) | 2010-03-04 |
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