KR101168389B1 - Method for fabricating semiconductor device - Google Patents
Method for fabricating semiconductor device Download PDFInfo
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- KR101168389B1 KR101168389B1 KR1020060058668A KR20060058668A KR101168389B1 KR 101168389 B1 KR101168389 B1 KR 101168389B1 KR 1020060058668 A KR1020060058668 A KR 1020060058668A KR 20060058668 A KR20060058668 A KR 20060058668A KR 101168389 B1 KR101168389 B1 KR 101168389B1
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- 238000000034 method Methods 0.000 title claims abstract description 42
- 239000004065 semiconductor Substances 0.000 title claims abstract description 24
- 239000003990 capacitor Substances 0.000 claims abstract description 22
- 238000004519 manufacturing process Methods 0.000 claims abstract description 15
- 229910021420 polycrystalline silicon Inorganic materials 0.000 claims abstract description 15
- 229920005591 polysilicon Polymers 0.000 claims abstract description 15
- 238000005530 etching Methods 0.000 claims description 9
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 8
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims description 6
- 229920002120 photoresistant polymer Polymers 0.000 claims description 5
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 4
- 229910002367 SrTiO Inorganic materials 0.000 claims description 4
- -1 Ta 2 O 5 Inorganic materials 0.000 claims description 4
- 229910003071 TaON Inorganic materials 0.000 claims description 4
- 229910010413 TiO 2 Inorganic materials 0.000 claims description 4
- 239000000758 substrate Substances 0.000 claims description 4
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 claims description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 2
- 239000005380 borophosphosilicate glass Substances 0.000 claims description 2
- QPJSUIGXIBEQAC-UHFFFAOYSA-N n-(2,4-dichloro-5-propan-2-yloxyphenyl)acetamide Chemical compound CC(C)OC1=CC(NC(C)=O)=C(Cl)C=C1Cl QPJSUIGXIBEQAC-UHFFFAOYSA-N 0.000 claims description 2
- 238000001039 wet etching Methods 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 abstract description 4
- 239000010410 layer Substances 0.000 description 38
- 238000007796 conventional method Methods 0.000 description 4
- 238000007792 addition Methods 0.000 description 2
- 238000001465 metallisation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
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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
- H01L21/76838—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 conductors
- H01L21/76841—Barrier, adhesion or liner layers
- H01L21/7687—Thin films associated with contacts of capacitors
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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
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
- H01L21/3205—Deposition of non-insulating-, e.g. conductive- or resistive-, layers on insulating layers; After-treatment of these layers
- H01L21/32055—Deposition of semiconductive layers, e.g. poly - or amorphous silicon layers
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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
- H01L21/76829—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 characterised by the formation of thin functional dielectric layers, e.g. dielectric etch-stop, barrier, capping or liner layers
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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
- H01L21/76835—Combinations of two or more different dielectric layers having a low dielectric constant
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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
- H01L21/76838—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 conductors
- H01L21/76841—Barrier, adhesion or liner layers
- H01L21/76853—Barrier, adhesion or liner layers characterized by particular after-treatment steps
- H01L21/76865—Selective removal of parts of the layer
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Abstract
본 발명은 반도체 소자의 제조 방법에 관한 것으로, 특히 실린더 형 캐패시터 형성 시 하부 저장 전극을 지지하는 희생막을 폴리실리콘층과 산화막의 적층구조로 형성하고, 저장 전극 영역 외 측에 플레이트 전극을 형성하기 위한 딥-아웃 공정 시 산화막만을 제거함으로써, 실린더 형 캐패시터의 구조적 기울어짐을 방지하여 소자의 수율을 향상시킬 수 있는 기술이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a semiconductor device, and in particular, to form a sacrificial film for supporting a lower storage electrode in the formation of a cylindrical capacitor in a laminated structure of a polysilicon layer and an oxide film, and to form a plate electrode outside the storage electrode region. By removing only the oxide film during the dip-out process, it is possible to prevent structural inclination of the cylindrical capacitor to improve the yield of the device.
Description
도 1은 종래 기술에 따라 형성한 반도체 소자의 단면도.1 is a cross-sectional view of a semiconductor device formed in accordance with the prior art.
도 2는 종래 기술에 따라 형성한 반도체 소자의 사진.2 is a photograph of a semiconductor device formed according to the prior art.
도 3은 종래 기술에 따라 형성한 반도체 소자의 모사이드 비트맵퍼(Mosaid bitmapper) 결과도.3 is a Mosaid bitmapper result of a semiconductor device formed according to the prior art.
도 4a 내지 4h는 본 발명에 따른 반도체 소자의 제조 방법을 도시한 단면도들.4A to 4H are cross-sectional views illustrating a method of manufacturing a semiconductor device in accordance with the present invention.
본 발명은 반도체 소자의 제조 방법에 관한 것으로, 특히 실린더 형 캐패시터 형성 시 하부 저장 전극을 지지하는 희생막을 폴리실리콘층과 산화막의 적층구조로 형성하고, 저장 전극 영역 외 측에 플레이트 전극을 형성하기 위한 딥-아웃 공정 시 산화막만을 제거함으로써, 실린더 형 캐패시터의 구조적 기울어짐을 방지하여 소자의 수율을 향상시킬 수 있는 반도체 소자의 제조 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 in particular, to form a sacrificial film for supporting a lower storage electrode in the formation of a cylindrical capacitor in a laminated structure of a polysilicon layer and an oxide film, and to form a plate electrode outside the storage electrode region. By removing only the oxide film during the dip-out process, the present invention relates to a method of manufacturing a semiconductor device capable of preventing structural inclination of a cylindrical capacitor to improve device yield.
일반적으로, 컨캐이브 형 캐패시터는 저장 전극 영역에만 저장 전극을 형성하였으나, 실린더 형 캐패시터는 저장 전극 영역 외 측에도 저장 전극을 형성하기 때문에 저장 전극 영역을 형성하는데 프레임이 되는 층간 절연막을 딥-아웃 공정으로 제거한다. 이때, 하부 저장 전극은 20000Å 이상의 높이로 홀로 서있는 형태가 되어, 어느 방향으로든 약간 기울어질 수밖에 없다.In general, a concave type capacitor forms a storage electrode only in the storage electrode region. However, since a cylindrical capacitor forms a storage electrode outside the storage electrode region, an interlayer insulating film serving as a frame for forming the storage electrode region is used as a dip-out process. Remove At this time, the lower storage electrode is in the form of standing alone at a height of 20000 Å or more, and is inclined slightly in any direction.
도 1은 종래 방법으로 형성한 실린더 형 캐패시터를 도시한 단면도로, 저장 전극 영역 외 측의 희생막을 딥-아웃 공정으로 제거한 상태를 도시한다. 저장 전극 콘택 영역(20)을 포함하는 반도체 기판(10) 상부에 형성된 식각 정지막(30) 사이에 저장 전극 콘택 영역(20)과 콘택되는 하부 저장 전극(50)만이 약 2°정도 기울어진 상태로 도시되어 있다.1 is a cross-sectional view illustrating a cylindrical capacitor formed by a conventional method, and illustrates a state in which a sacrificial film outside the storage electrode region is removed by a dip-out process. Only the storage
도 2는 종래 방법으로 형성한 실린더 형 캐패시터를 도시한 SEM 사진으로, 캐패시터가 작은 각도이지만 랜덤(Random)하게 기울어져(Leaning) 있음을 볼 수 있다. 따라서, 필연적으로 인접한 캐패시터들이 쌍을 이루어 캐패시터 상단에서 단락이 생길 수 있다.FIG. 2 is a SEM photograph showing a cylindrical capacitor formed by a conventional method, and it can be seen that the capacitor is inclined at random angles (Random). Thus, inevitably, adjacent capacitors may be paired to cause a short circuit at the top of the capacitor.
도 3은 종래 방법으로 형성한 실린더 형 캐패시터에 대한 반도체 소자의 모사이드 비트맵퍼(Mosaid bitmapper)의 결과도이다. 특히, 캐패시터 상부의 단락을 가지는 소자가 많이 검출되며, 이러한 패턴은 공정상 기울어짐 현상(Leaning phenomena)을 받기 쉬운 뱅크(Bank) 외곽 지역에 더 많이 분포하는 것을 볼 수 있다.3 is a result diagram of a Mosaid bitmapper of a semiconductor device for a cylindrical capacitor formed by a conventional method. In particular, a large number of devices having a short circuit in the upper part of the capacitor are detected, and such a pattern may be seen to be distributed more in an area outside the bank which is susceptible to process leaning (phenanna).
따라서, 종래 방법으로 형성하는 실린더 형 캐패시터는 상단이 기울어짐으로써 전기적으로 단락되는 문제가 발생하게 된다. 또한, 디자인 룰의 감소로 캐패시터의 간격도 좁아지고, 종횡비가 커져 이와 같은 문제가 더욱 증가 될 것이다.Therefore, the cylindrical capacitor formed by the conventional method causes a problem that the upper end is inclined and electrically shorted. In addition, the reduction in design rules will also narrow the spacing of the capacitors, and the aspect ratio will increase, which will further increase this problem.
본 발명은 상기와 같은 문제점을 해결하기 위한 것으로서, 특히 실린더 형 캐패시터 형성 시 하부 저장 전극을 지지하는 희생막을 폴리실리콘층과 산화막의 적층구조로 형성하고, 저장 전극 영역 외 측에 플레이트 전극을 형성하기 위한 딥-아웃 공정 시 산화막만을 제거함으로써, 실린더 형 캐패시터의 구조적 기울어짐을 방지하여 소자의 수율을 향상시킬 수 있는 반도체 소자의 제조 방법을 제공한다.The present invention is to solve the above problems, in particular to form a sacrificial film for supporting the lower storage electrode when forming a cylindrical capacitor in a laminated structure of a polysilicon layer and an oxide film, to form a plate electrode outside the storage electrode region The present invention provides a method of manufacturing a semiconductor device capable of improving the yield of a device by preventing structural tilt of a cylindrical capacitor by removing only an oxide film during a dip-out process.
본 발명은 상기와 같은 목적을 달성하기 위한 것으로서, 본 발명의 제 1 실시 예에 따른 반도체 소자의 제조 방법은,The present invention is to achieve the above object, the manufacturing method of a semiconductor device according to a first embodiment of the present invention,
하부 구조를 구비한 반도체 기판 상부에 폴리실리콘층과 산화막의 적층구조를 형성하는 단계;Forming a stacked structure of a polysilicon layer and an oxide film on the semiconductor substrate having a lower structure;
저장 전극 마스크로 상기 폴리실리콘층과 상기 산화막을 식각하여 하부 구조를 노출하는 저장 전극 영역을 형성하는 단계와, 저장 전극 영역의 측벽에 제 1 유전막을 형성하는 단계와, 저장 전극 영역 내에 하부 저장 전극과 제 2 유전막의 적층구조를 형성하는 단계와, 저장 전극 영역을 매립하는 제 1 플레이트 전극을 형성하는 단계와, 저장 전극 영역 외 측의 산화막을 제거하여 제 1 유전막을 노출하는 단계와, 산화막이 제거된 저장 전극 영역 사이를 매립하는 제 2 플레이트 전극을 형성하여 실린더 형 캐패시터를 형성하는 단계를 포함하는 것을 특징으로 한다.Etching the polysilicon layer and the oxide layer using a storage electrode mask to form a storage electrode region exposing an underlying structure, forming a first dielectric layer on a sidewall of the storage electrode region, and forming a lower storage electrode in the storage electrode region. Forming a stacked structure of the second dielectric layer, forming a first plate electrode to fill the storage electrode region, exposing the first dielectric layer by removing an oxide film outside the storage electrode region, and And forming a cylindrical capacitor by forming a second plate electrode that fills between the removed storage electrode regions.
이하에서는 본 발명의 실시 예를 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 4a 내지 4h은 본 발명에 따른 반도체 소자의 제조 방법을 도시한 단면도들이다.4A to 4H are cross-sectional views illustrating a method of manufacturing a semiconductor device in accordance with the present invention.
도 4a을 참조하면, 저장 전극 콘택 플러그(120)를 포함하는 하부 구조가 구비된 반도체 기판(10) 상부에 식각 정지막(130)을 형성한다. 다음으로, 식각 정지막(130) 상부에 폴리실리콘층(135)과 산화막(140)의 적층구조를 형성한다. 여기서, 식각 정지막(130)은 질화막으로 형성하는 것이 바람직하다. 여기서, 폴리실리콘층(135)과 산화막(140)의 적층구조의 두께는 10000Å이상인 것이 바람직하다. 또한, 산화막(140)은 PE TEOS 막, USG 막, PSG 막, BPSG 막 또는 SOG 막으로 형성할 수 있다.Referring to FIG. 4A, an
도 4b 및 4c를 참조하면, 저장 전극 마스크(미도시)로 산화막(140), 폴리실리콘층(135) 및 식각 정지막(130)을 식각하여 하부의 저장 전극 콘택 플러그(120)를 노출하는 저장 전극 영역(145)을 형성한다. 이후, 전체 표면 상부에 제 1 유전막(147)을 증착한 후, 이를 에치백(Etch-back) 방법으로 식각하여 저장 전극 영역(145)의 측벽에만 제 1 유전막(147)을 남긴다. 여기서, 저장 전극 영역(145) 형성을 위한 식각 공정은 두 개의 하드 마스크를 사용하는 이중 노광 방법을 이용하여 수행되는 것이 바람직하다. 또한, 제 1 유전막(147)은 SiO2, SiO2/Si3N4, TaON, Ta2O5, Al2O3, HfO2, TiO2, SrTiO3, (Ba, Sr)TiO3, (Pb, Sr)TiO3 또는 ZrO2으로 형성될 수 있다.4B and 4C, the
도 4d 및 4e를 참조하면, 전체 표면 상부에 하부 저장 전극용 도전층(미도 시)을 형성한 후, 도 4c에 도시된 저장 전극 영역(145)을 매립하는 감광막(153)을 형성한다. 다음으로, 감광막(153)을 마스크로 에치백하여 하부 저장 전극(150)을 형성한다. 이후, 감광막(153)을 제거한 후, 전체 표면 상부에 제 2 유전막(155)을 증착한다. 여기서, 하부 저장 전극용 도전층은 폴리실리콘층으로 형성하는 것이 바람직하다. 또한, 제 2 유전막(155)은 SiO2, SiO2/Si3N4, TaON, Ta2O5, Al2O3, HfO2, TiO2, SrTiO3, (Ba, Sr)TiO3, (Pb, Sr)TiO3 또는 ZrO2으로 형성할 수 있다.4D and 4E, after forming a conductive layer (not shown) for the lower storage electrode on the entire surface, a
도 4f 내지 4h를 참조하면, 저장 전극 영역(145)을 매립하는 플레이트 전극용 도전층(157)을 형성한 후, 산화막(140)을 노출할 때까지 전체 표면을 평탄화 식각하여 제 1 플레이트 전극(160)을 형성한다. 다음으로, 노출된 산화막(140)을 제거하는 딥-아웃(Dip-out) 공정을 수행하여 도 4e에 도시된 저장 전극 영역(145) 외 측에 제 1 유전막(147)을 노출한다. 이후, 전체 표면 상부에 플레이트 전극용 도전층(미도시)을 형성하여 도 4e에 도시된 산화막(140)이 제거된 저장 전극 영역(145) 외 측의 공간을 매립한다. 다음으로, 플레이트 전극용 도전층을 평탄화 식각하여 도 4e에 도시된 저장 전극 영역(145) 외부에 제 2 플레이트 전극(170)을 형성한다. 따라서, 저장 전극 영역 안과 밖에 저장 전극을 형성한 실린더 형 캐패시터가 완성된다. 여기서, 제 1 플레이트 전극(160) 형성을 위한 평탄화 식각 공정은 CMP 방법 또는 에치백(Etch-back) 방법으로 수행되는 것이 바람직하다. 또한, 플레이트 전극용 도전층은 TiN 막, Ru 막 또는 폴리실리콘층으로 형성할 수 있다. 그리고 산화막(140)을 제거하는 딥-아웃 공정은 BOE 또는 불산(HF)을 이용한 습식 식각 방법으 로 수행되는 것이 바람직하다.4F through 4H, after forming the plate electrode
이후의 공정은 금속 배선 콘택 및 금속 배선 형성과 같은 일반적 트랜지스터 제조 공정을 수행하여 반도체 소자를 완성한다.Subsequent processes perform general transistor fabrication processes such as metallization contacts and metallization formation to complete semiconductor devices.
이상에서 설명한 바와 같이, 본 발명에 따른 반도체 소자의 제조 방법은 실린더 형 캐패시터 형성 시 하부 저장 전극을 지지하는 희생막을 폴리실리콘층과 산화막의 적층구조로 형성하고, 저장 전극 영역 외 측에 플레이트 전극을 형성하기 위한 딥-아웃 공정 시 산화막만을 제거함으로써, 실린더 형 캐패시터의 구조적 기울어짐을 방지하여 소자의 수율을 향상시킬 수 있는 효과가 있다.As described above, in the method of manufacturing a semiconductor device according to the present invention, a sacrificial layer for supporting a lower storage electrode is formed in a laminated structure of a polysilicon layer and an oxide layer when a cylindrical capacitor is formed, and a plate electrode is formed outside the storage electrode region. By removing only the oxide film during the formation of the dip-out process, it is possible to prevent structural inclination of the cylindrical capacitor to improve the yield of the device.
아울러 본 발명의 바람직한 실시 예는 예시의 목적을 위한 것으로, 당업자라면 첨부된 특허청구범위의 기술적 사상과 범위를 통해 다양한 수정, 변경, 대체 및 부가가 가능할 것이며, 이러한 수정 변경 등은 이하의 특허청구범위에 속하는 것으로 보아야 할 것이다.It will be apparent to those skilled in the art that various modifications, additions, and substitutions are possible, and that various modifications, additions and substitutions are possible, within the spirit and scope of the appended claims. As shown in Fig.
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