KR100398661B1 - Manufacturing method of thin-films capacitor for integration devices - Google Patents
Manufacturing method of thin-films capacitor for integration devices Download PDFInfo
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- KR100398661B1 KR100398661B1 KR10-2001-0058884A KR20010058884A KR100398661B1 KR 100398661 B1 KR100398661 B1 KR 100398661B1 KR 20010058884 A KR20010058884 A KR 20010058884A KR 100398661 B1 KR100398661 B1 KR 100398661B1
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- 239000003990 capacitor Substances 0.000 title claims abstract description 59
- 239000010409 thin film Substances 0.000 title claims abstract description 57
- 238000004519 manufacturing process Methods 0.000 title claims description 20
- 230000010354 integration Effects 0.000 title description 5
- 238000000034 method Methods 0.000 claims abstract description 48
- 238000000137 annealing Methods 0.000 claims abstract description 15
- 239000000758 substrate Substances 0.000 claims abstract description 9
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 3
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 3
- 239000010703 silicon Substances 0.000 claims abstract description 3
- 239000010408 film Substances 0.000 claims description 26
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 8
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 7
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 claims description 7
- 238000000151 deposition Methods 0.000 claims description 6
- 238000004544 sputter deposition Methods 0.000 claims description 6
- 229910052782 aluminium Inorganic materials 0.000 claims description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 5
- 239000001301 oxygen Substances 0.000 claims description 5
- 229910052760 oxygen Inorganic materials 0.000 claims description 5
- 238000002207 thermal evaporation Methods 0.000 claims description 3
- 230000008021 deposition Effects 0.000 claims description 2
- 239000007789 gas Substances 0.000 claims description 2
- HGWOWDFNMKCVLG-UHFFFAOYSA-N [O--].[O--].[Ti+4].[Ti+4] Chemical compound [O--].[O--].[Ti+4].[Ti+4] HGWOWDFNMKCVLG-UHFFFAOYSA-N 0.000 claims 1
- 230000008569 process Effects 0.000 abstract description 33
- 229910018072 Al 2 O 3 Inorganic materials 0.000 abstract description 8
- 229910010413 TiO 2 Inorganic materials 0.000 abstract description 8
- 238000009792 diffusion process Methods 0.000 abstract description 8
- 239000000203 mixture Substances 0.000 abstract description 7
- 230000007547 defect Effects 0.000 abstract description 6
- 230000008859 change Effects 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 4
- 238000002425 crystallisation Methods 0.000 abstract description 3
- 230000008025 crystallization Effects 0.000 abstract description 3
- 238000010438 heat treatment Methods 0.000 abstract description 3
- 239000006185 dispersion Substances 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 33
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 9
- 239000004065 semiconductor Substances 0.000 description 8
- 239000010936 titanium Substances 0.000 description 7
- 239000000463 material Substances 0.000 description 6
- 229910052719 titanium Inorganic materials 0.000 description 6
- 230000005684 electric field Effects 0.000 description 5
- 230000010287 polarization Effects 0.000 description 5
- 229910001925 ruthenium oxide Inorganic materials 0.000 description 5
- WOCIAKWEIIZHES-UHFFFAOYSA-N ruthenium(iv) oxide Chemical compound O=[Ru]=O WOCIAKWEIIZHES-UHFFFAOYSA-N 0.000 description 5
- 229910052726 zirconium Inorganic materials 0.000 description 5
- 239000010949 copper Substances 0.000 description 4
- 239000003989 dielectric material Substances 0.000 description 4
- 238000005240 physical vapour deposition Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000004020 conductor Substances 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 229910052745 lead Inorganic materials 0.000 description 3
- 229910052697 platinum Inorganic materials 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 230000002269 spontaneous effect Effects 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 230000002457 bidirectional effect Effects 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000000059 patterning Methods 0.000 description 2
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- -1 Si 3 N 4 Inorganic materials 0.000 description 1
- 229910002367 SrTiO Inorganic materials 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 238000005229 chemical vapour deposition Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000004453 electron probe microanalysis Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000407 epitaxy Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- BHEPBYXIRTUNPN-UHFFFAOYSA-N hydridophosphorus(.) (triplet) Chemical compound [PH] BHEPBYXIRTUNPN-UHFFFAOYSA-N 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 229910000464 lead oxide Inorganic materials 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- YEXPOXQUZXUXJW-UHFFFAOYSA-N oxolead Chemical compound [Pb]=O YEXPOXQUZXUXJW-UHFFFAOYSA-N 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 229920005591 polysilicon Polymers 0.000 description 1
- 239000010970 precious metal Substances 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 239000005368 silicate glass Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
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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
-
- 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
- H01L21/02109—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
- H01L21/02172—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 at least one metal element, e.g. metal oxides, metal nitrides, metal oxynitrides or metal carbides
- H01L21/02175—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 at least one metal element, e.g. metal oxides, metal nitrides, metal oxynitrides or metal carbides characterised by the metal
- H01L21/02178—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 at least one metal element, e.g. metal oxides, metal nitrides, metal oxynitrides or metal carbides characterised by the metal the material containing aluminium, e.g. Al2O3
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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
- H01L21/02109—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
- H01L21/02172—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 at least one metal element, e.g. metal oxides, metal nitrides, metal oxynitrides or metal carbides
- H01L21/02175—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 at least one metal element, e.g. metal oxides, metal nitrides, metal oxynitrides or metal carbides characterised by the metal
- H01L21/02186—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 at least one metal element, e.g. metal oxides, metal nitrides, metal oxynitrides or metal carbides characterised by the metal the material containing titanium, e.g. TiO2
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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
- H01L21/0226—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process
- H01L21/02263—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process deposition from the gas or vapour phase
- H01L21/02266—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process deposition from the gas or vapour phase deposition by physical ablation of a target, e.g. sputtering, reactive sputtering, physical vapour deposition or pulsed laser deposition
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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
- H01L21/0226—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process
- H01L21/02263—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process deposition from the gas or vapour phase
- H01L21/02269—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a deposition process deposition from the gas or vapour phase deposition by thermal evaporation
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- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Manufacturing & Machinery (AREA)
- Optics & Photonics (AREA)
- Semiconductor Integrated Circuits (AREA)
Abstract
본 발명은 결정화 및 어닐링을 위한 후속 열처리 공정에서 PZT박막내의 납 확산과 휘발을 방지하도록 한 집적화 전자기소자용 박막 커패시터 제조 방법에 관한 것으로, 실리콘 웨이퍼 기판상에 절연층 박막을 형성하는 제 1 공정; 상기 절연층 박막상에 하부 전극 패턴과 유전체 박막 패턴 및 상부 전극 패턴으로 된 집적화된 전자기소자의 커패시터를 형성하는 제 2 공정; 및 상기 제 2 공정에 의해 형성된 유전체의 상부 및 하부 표면에 다층 구조로 된 완화층(Al2O3, TiO2)을 형성하는 제 3 공정을 구비함으로써, 후속 어닐링 공정에 따른 커패시터 유전체 박막내에서의 Pb의 확산 및 휘발이 방지되어 유전체 박막내의 Pb 조성을 균일하게 하고 커패시터의 유전 특성 변화를 방지하며 유전체 박막과 상·하부 전극 사이의 계면에서 발생하는 계면 결함을 줄여 상·하부 전극부위에서 전계집중 효과를 분산시키고 열적안정성이 도모되어 커패시터의 신뢰성을 향상시킬 수 있다.The present invention relates to a method for fabricating a thin film capacitor for an integrated electromagnetic device which prevents lead diffusion and volatilization in a PZT thin film in a subsequent heat treatment process for crystallization and annealing, comprising: a first step of forming an insulating layer thin film on a silicon wafer substrate; Forming a capacitor of an integrated electromagnetic device having a lower electrode pattern, a dielectric thin film pattern, and an upper electrode pattern on the insulating layer thin film; And a third process of forming a relaxed layer (Al 2 O 3 , TiO 2 ) having a multi-layered structure on the upper and lower surfaces of the dielectric formed by the second process, thereby forming a capacitor dielectric thin film according to a subsequent annealing process. Pb diffusion and volatilization are prevented to uniformize the Pb composition in the dielectric thin film, prevent the change of dielectric characteristics of the capacitor, and reduce the interface defects occurring at the interface between the dielectric thin film and the upper and lower electrodes. Dispersion of effects and thermal stability can improve capacitor reliability.
Description
본 발명은 집적화 전자기소자용 박막 커패시터 제조 방법에 관한 것으로, 보다 상세하게는 유전체를 사용하는 커패시터의 제조시에 발생하는 유전열화와 전계집중 효과를 방지할 수 있도록 한 집적화 전자기소자용 박막 커패시터 제조 방법에 관한 것이다.The present invention relates to a method for manufacturing a thin film capacitor for an integrated electromagnetic device, and more particularly, to a method for manufacturing a thin film capacitor for an integrated electronic device, which can prevent dielectric degradation and electric field concentration effects occurring during the manufacture of a capacitor using a dielectric. It is about.
최근 수동소자 커패시터의 소형·박형화와 반도체 기억 소자인 DRAM의 집적도 증가는 주어진 면적에서 유전체의 두께 감소, 유전율의 증대, 적은 누설전류, 오동작이나 에러의 감소를 계속 요구하고 있으며, 지금까지 사용되어 온 SiO2, Si3N4, SiO2/Si3N4, TaN 등은 커패시터로써의 응용이 물리적 한계에 도달하게 되었다.In recent years, the miniaturization and thinning of passive element capacitors and the increase in the degree of integration of DRAM, semiconductor memory devices, require the reduction of the thickness of the dielectric, the increase of the dielectric constant, the small leakage current, the reduction of the malfunction or the error in a given area, and have been used until now. The application of SiO 2 , Si 3 N 4 , SiO 2 / Si 3 N 4 , TaN and the like has reached the physical limit.
단적인 예로 아래 <식 1>과 같이 두께(T)는 커패시터의 정전용량에 큰 영향을 주게 되며, R L C 수동소자의 집적도 증가는 상대적으로 작은 면적(A)의 유전체를 요구하게 된다.For example, as shown in Equation 1 below, the thickness T greatly affects the capacitance of the capacitor, and the increase in the density of the R L C passive element requires a relatively small area A of dielectric.
<식 1><Equation 1>
정전용량(Capacitance) = (εr × ε0× A)/TCapacitance = (εr × ε 0 × A) / T
여기서, ε0는 진공 유전율(permitivity of vacuum), εr는 유전체의상수(dielectric constant), A는 유전체의 표면적, T는 유전체의 두께를 나타낸다.Where ε 0 is the permittivity of vacuum, εr is the dielectric constant, A is the surface area of the dielectric, and T is the thickness of the dielectric.
정전용량 C를 증가시키기 위하여 유전 상수가 높은 물질을 유전체로 사용하거나, 유전체 박막의 두께를 얇게 하거나 또는 고밀도 집적화를 위하여 소자내에서 차지하는 커패시터의 면적을 줄이는 대신 3차원 설계를 도입하여 전하저장 전극의 표면적을 증가시키는 방법으로 다결정실리콘 층을 다층으로 형성한 후 이들을 관통하여 서로 연결시키는 핀 구조로 형성하거나, 접촉부 상부에 실린더 형상의 전극을 만드는 방법 등을 사용하기도 한다.Instead of using a high dielectric constant material as the dielectric to increase the capacitance C, thinning the thickness of the dielectric thin film, or reducing the area of the capacitor occupied in the device for high density integration, a three-dimensional design is introduced. As a method of increasing the surface area, a polysilicon layer may be formed in a multi-layered structure and then formed into a fin structure through which they are connected to each other, or a cylindrical electrode may be formed on the contact portion.
기판을 이용하는 방법으로는 R L C 집적도를 증가시키기 위하여 유전상수가 큰 기판을 이용해 기판 자체를 유전체로 사용하는 방법도 이론적으로 제기된다.As a method of using a substrate, a method of using the substrate itself as a dielectric using a substrate having a high dielectric constant is also proposed in order to increase R L C density.
그러나, 이러한 방법들은 모두 각각 문제점을 가지고 있다. 유전체 두께를 감소시키는 것은 소자 동작시 유전체 박막이 파괴되어 커패시터의 신뢰도에 심각한 영향을 주고, 커패시터의 높이를 증가시키면 단차에 의해 정밀 가공과 후속 공정이 어려워지고 수동소자의 고집적화에 따라 소자의 면적이 감소되어 정전용량 확보가 어려워진다.However, all of these methods have their own problems. Reducing the thickness of the dielectric breaks the dielectric thin film during operation of the device, which seriously affects the reliability of the capacitor.Increasing the height of the capacitor makes it difficult to precisely process and follow-up processes due to the step, and the area of the device increases due to the high integration of passive devices. This makes it difficult to secure capacitance.
대체가 예상되는 유전체로는 높은 유전 상수를 갖는 물질로써 TiO2, SrTiO3등이 연구되고 있으나, 이러한 물질들은 단자-도전로의 접합, 절연파괴전압 등과 같이 해결해야 할 과제가 많아 아직 실제 소자 제조 공정에 적용하기는 어렵다.Dielectrics expected to be replaced are materials with high dielectric constants, such as TiO 2 and SrTiO 3 , but these materials have many challenges to solve such as terminal-conductor junction and dielectric breakdown voltage. It is difficult to apply to the process.
상기와 같은 유전 상수가 높은 물질중 (Bax-Srx)TiO3(BST), Pb(Zr, Ti)O3(PZT), SrBi2Ta2O9(SBT, Y1) 등과 같은 강유전체 박막은 상온에서 유전 상수가100 ∼1000 정도 이상에 이르며, 두 개의 안정한 잔류분극(regainment polarization) 상태를 가지고 있어 박막화하면 전원이 꺼진 상태에서도 전하량이 충전된 상태이므로 신호를 저장할 수 있는 소자의 특성을 가지고 있으므로 전자기소자 커패시터, 비휘발성(nonvolatile) 메모리, 정보저장 소자로써 많은 관심이 고조되고 있다.Ferroelectric thin films such as (Ba x -Sr x ) TiO 3 (BST), Pb (Zr, Ti) O 3 (PZT), SrBi 2 Ta 2 O 9 (SBT, Y 1 ), etc. Has a dielectric constant of more than 100 to 1000 at room temperature, and has two stable residual polarization states. When thinned, the device can store signals because its charge is charged even when the power is turned off. As a result, a lot of interest has been raised as electromagnetic device capacitors, nonvolatile memory, and information storage devices.
이것은 상기와 같은 유전체를 이용할 경우 작은 면적에서 정전용량의 확보가 용이하여 다른 정보저장이나, 메모리, 커패시터에 비하여 제조 공정이 간단하며 고집적도가 가능하고 신뢰성과 동작 속도가 높은 소자를 얻을 수 있기 때문이다.This is because when using the dielectric as described above, it is easy to secure the capacitance in a small area, so that the manufacturing process is simpler than other information storage, memory, and capacitor, and the device can obtain high integration, high reliability, and high operation speed. to be.
상기 커패시터의 강유전체 물질은 양방향 분극 안정성을 이용하여 전계가 제거되더라도 충전된 전하가 그냥 남아있는 특징을 갖는 소자로써 동작원리를 상세히 살펴보면 다음과 같다.The ferroelectric material of the capacitor is a device having a feature that the charged charge remains even though the electric field is removed using bidirectional polarization stability.
강유전체의 양방향 안정성은 강유전 분역(domain)이라고 불리는 결정내의 영역이 균일한 자발 분극(spontaneous polarization)을 갖고 이들이 가해준 전계의 방향과 나란히 분포하는데, 이 도메인의 분극 방향이 전계의 방향에 의하여 조절되는 성질을 이용하는 것이 기본 동작의 원리라 할 수 있다.Bidirectional stability of ferroelectrics means that regions within the crystal, called ferroelectric domains, have uniform spontaneous polarization and are parallel to the direction of the applied electric field, which is controlled by the direction of the electric field. Using properties is the principle of basic operation.
그러므로, 이런 원리를 이용해 충전과 방전이 지속되고 읽기(reading)와 쓰기(writing)가 가능한 것이다.Therefore, using this principle, charging and discharging are continued and reading and writing are possible.
한편, 이들 도메인의 전계에 따른 반전 속도는 수 ∼수십 nsec 정도인 것으로 알려져 있으며, 원리적으론 충방전, 읽기 쓰기의 고속동작이 가능하고 도메인의반전에 필요한 전계의 크기가 전기전도 이론에서 전자 터널링 현상을 이용한 기억 소자에 비하면 소비전력이 1/4 정도로 작다는 장점도 갖고 있다.On the other hand, it is known that the reversal speed according to the electric field of these domains is in the order of several to several tens of nsec. Compared with the memory device using the phenomenon, the power consumption is about 1/4 as small.
그러나, PZT 등이 기존의 반도체 공정에서 폭넓게 이용되고 있지 않다는 점에서 아직은 여러 공정단계의 개발이 필요한 상태이다.However, PZT and the like are not widely used in the existing semiconductor process, and thus, various process steps need to be developed.
특히, PZT 강유전체 박막재료의 제조는 커패시터 공정중에서 가장 핵심을 이루는 부분으로 어려운 공정중의 하나이다. 이는 PZT가 4 성분계의 산화물이며 Pb와 같이 휘발성이 매우 강한 성분을 포함하고 있어서 정확하고 재현성 있는 IC 공정이 어렵기 때문이다. 상기의 PZT 박막은 그 조성이 정확하게 조절되지 않으면 페로브스카이트(perovskite) 결정구조가 잘 형성되지 않아 커패시터 동작의 핵심인 분극이 어려워지기 때문이다.In particular, the manufacturing of the PZT ferroelectric thin film material is one of the difficult processes as a key part of the capacitor process. This is because PZT is a four-component oxide and contains highly volatile components such as Pb, making it difficult to accurately and reproducible IC processes. If the PZT thin film is not properly controlled in composition, the perovskite crystal structure is not well formed, which makes it difficult to polarize the core of the capacitor operation.
상기 페로브스카이트 결정구조를 갖는 물질중 대표적인 것은 BaTiO3로 알려져 있으며 자발분극이 없는 상유전 상태와 자발분극이 존재하는 강유전 상태로 그 특징을 표시할 수 있으며, 이것은 곧 커패시터의 작동 영역을 의미하기도 한다.Representative materials of the perovskite crystal structure are known as BaTiO 3 and can be characterized by a phase dielectric state without spontaneous polarization and a ferroelectric state in which spontaneous polarization exists, which means an operating region of a capacitor. Sometimes.
상술한 바와 같은 이유로 인해 현재 양산과 연구개발을 위한 과정에서는 기존 IC 공정에서 많이 사용하는 스퍼터링(sputtering)이나 PVD(physical vapor deposition), CVD(chemical vapor deposition) 공정과는 다르고 화학적으론 안정한 졸겔(sol-gel) 프로세스가 사용되고 있다.Due to the reasons mentioned above, the process for mass production and R & D is different from the sputtering, physical vapor deposition (PVD), and chemical vapor deposition (PVD) processes that are commonly used in existing IC processes. gel process is being used.
PZT 강유전체 박막을 사용하는 커패시터의 전극으로는 기존의 반도체 커패시터에 사용되는 다결정 실리콘이 아닌 백금(Pt) 등과 같은 귀금속이나 RuO2등과 같은 산화물 도전체 전극이 사용되는데, 이들은 반응성이 높은 PZT 와도 화학 반응이 일어나지 않으며 우수한 전기적 특성을 갖고 있다. 그러나, 전자기 부품과 메모리 반도체 가격의 폭락에도 불구하고 값이 비싼 귀금속을 사용해야 하는 단점이 있다.As a capacitor electrode using a PZT ferroelectric thin film, a noble metal such as platinum (Pt) or an oxide conductor electrode such as RuO 2 is used instead of polycrystalline silicon, which is used in a conventional semiconductor capacitor. This does not happen and has excellent electrical properties. However, despite the plunging prices of electromagnetic components and memory semiconductors, expensive precious metals have to be used.
PZT 강유전체 박막의 커패시터 공정에서 전극 및 강유전체 공정과 함께 페시베이션과 금속단자 제조 공정이 또 하나의 핵심공정이다. 이들 공정중에 PZT 박막을 사용한 커패시터와 여러 가지 물리적 화학적 상호 작용을 일으켜 커패시터의 성능에 큰 영향을 주기도 하는데 이중에 보편적으로 알려진게 PZT와 절연층 산화막과의 화학반응이다.In the capacitor process of PZT ferroelectric thin film, the passivation and metal terminal manufacturing process along with electrode and ferroelectric processes are another key process. During these processes, the PZT thin film has various physical and chemical interactions with the capacitor, which greatly affects the performance of the capacitor. The most common one is the chemical reaction between the PZT and the insulating layer oxide.
도 1은 종래 기술에 의해 집적화된 R L C 소자에서 박막 박커패시터의 실시 예에 따른 단면도를 나타낸 것이며 이를 참조하여 그 제조 공정을 살펴보면 다음과 같다.1 is a cross-sectional view according to an embodiment of a thin film thin capacitor in an R L C device integrated according to the prior art, and looks at the manufacturing process thereof with reference to the following.
먼저, 소정의 하부 구조물이 형성되어 있는 반도체 기판(10)상에 절연층 막(9)을 형성한 다음 상기 절연층 막(9)상에 도전 재질의 하부 전극(7)을 형성하고 유전체(6) 박막을 순차적으로 증착하고 어닐링한 후 다음 상기 하부 전극(7)상에 커패시터 유전체의 패터닝용 감광막을 형성하고, 이를 마스크로 상부 전극(5)과 유전체(6) 박막 및 하부 전극(7)을 순차적으로 식각하여 하부 도전층 패턴으로 된 하부 전극(7)과 유전체(6) 박막 패턴으로 된 커패시터 박막 및 상부 도전층 패턴으로 된 상부 전극(5)으로 구성되는 유전체 박막 커패시터를 구성한 후 산화막 재질의보호막(4; protection layer)을 형성하고 접촉단자를 만든 후 금속 배선을 형성한다.First, an insulating layer film 9 is formed on a semiconductor substrate 10 on which a predetermined lower structure is formed, and then a lower electrode 7 of a conductive material is formed on the insulating layer film 9, and a dielectric material 6 is formed. A thin film is sequentially deposited and annealed, and then a photosensitive film for patterning a capacitor dielectric is formed on the lower electrode 7, and the upper electrode 5 and the dielectric film 6 and the lower electrode 7 are formed using the mask. After etching sequentially, a dielectric thin film capacitor including a lower electrode 7 having a lower conductive layer pattern and a capacitor thin film having a dielectric film 6 pattern and an upper electrode 5 having an upper conductive layer pattern was formed. A protective layer 4 is formed, a contact terminal is formed, and metal wiring is formed.
이때, 상기 유전체(6) 박막 위의 상부 도전층 패턴의 상부 전극(5)은 역시 스퍼터링이나 열증착법으로 형성한다. 상기 상부 전극(5)은 구리(Cu)이고, 상기 하부 전극(7)은 열산화와 화학적으로 안정한 백금(Pt) 또는 루세늄옥사이드(RuO)과 같은 산화 도전층을 사용한다.At this time, the upper electrode 5 of the upper conductive layer pattern on the thin film of the dielectric 6 is also formed by sputtering or thermal evaporation. The upper electrode 5 is copper (Cu), and the lower electrode 7 uses an oxide conductive layer such as platinum (Pt) or ruthenium oxide (RuO) that is chemically stable with thermal oxidation.
상기 보호막(4)으로 사용되는 산화막과 하부 절연막(9)은 유전체 박막 내의 납(Pb)을 흡수하여 유전체 박막내의 납의 농도를 떨어뜨리고 유전 특성을 변화 시켜 소자의 전기적 물성을 열화시키는 문제점이 있다.The oxide film and the lower insulating film 9 used as the protective film 4 have a problem of absorbing lead (Pb) in the dielectric thin film to reduce the concentration of lead in the dielectric thin film and to change dielectric properties to deteriorate the electrical properties of the device.
상기와 같은 종래 기술에 따른 집적화 전자기소자의 커패시터 제조방법은 납 산화막의 반응 방지 및 박막 커패시터 형성후의 어닐링 공정시의 납 휘발을 방지하기 위하여 완화층을 형성하고 있으나, 완화층 형성후 실시하는 어닐링 공정전의 유전체 박막의 조성을 TEM, EDX 등으로 분석해 보면 표면에서부터 깊이에 따라 Pb, Zr, Ti의 분포가 일정하게 분포해 있지만 어닐링 후에는 완화층이 납의 확산과 휘발을 방지하지 못하여 유전체 박막 전체의 Pb 농도가 약 10 % 정도 감소된다. 특히, 상부 전극과 PZT 유전체 층의 계면 근처에서 Pb 의 농도가 감소되고 Zr의 농도가 증가되어 커패시터의 정전용량을 떨어뜨리고, PZT 박막 전체의 조성비가 불균일 하게 되어 커패시터 동작 특성을 저해하면서 집적화된 R L C 의 기능에 큰 영향을 주게된다.In the method of manufacturing a capacitor of an integrated electromagnetic device according to the related art, a relaxation layer is formed to prevent a reaction of lead oxide film and to prevent lead volatilization during an annealing process after forming a thin film capacitor, but an annealing process is performed after formation of a relaxation layer. Analysis of the former dielectric thin film composition by TEM, EDX, etc. shows that the distribution of Pb, Zr, Ti is uniformly distributed from the surface to the depth, but after annealing, the relaxation layer does not prevent lead diffusion and volatilization. Is reduced by about 10%. In particular, near the interface between the upper electrode and the PZT dielectric layer, the concentration of Pb is decreased and the concentration of Zr is decreased to lower the capacitance of the capacitor, and the composition ratio of the entire PZT thin film becomes uneven, thereby degrading the capacitor operation characteristics. It will have a big impact on its function.
어닐링 후에도 Pb의 농도가 부족한 PZT 박막과 상부 전극의 계면에 결함이발생하는 문제가 있다. 이런 결함은 주로 Pb의 농도가 상당히 부족하여 나타나는 것으로, 이로 인해 Pb 농도가 약 35 %, Zr 40 %, Ti 25 % 정도되는 비정질상태이다. 이런 상태는 박막 커패시터의 동작 특성을 방해하고 장기 신뢰성을 떨어뜨리며 열적 안정성을 나타내는 TCC 물성을 저하시킨다.Even after annealing, there is a problem that a defect occurs at an interface between the PZT thin film and the upper electrode, which has insufficient Pb concentration. These defects are mainly caused by a very low concentration of Pb, which is an amorphous state with Pb concentrations of about 35%, Zr 40%, and Ti 25%. This condition interferes with the thin film capacitor's operating characteristics, degrades long-term reliability and degrades TCC properties, which indicate thermal stability.
본 발명은 상기한 종래의 문제점을 해결하기 위해 제안된 것으로, 결정화 및 어닐링을 위한 후속 열처리 공정에서 PZT박막내의 납 확산과 휘발을 방지하도록 한 박막 커패시터 제조 방법을 제공함에 그 목적이 있다.The present invention has been proposed to solve the above-described problems, and an object thereof is to provide a thin film capacitor manufacturing method for preventing lead diffusion and volatilization in a PZT thin film in a subsequent heat treatment process for crystallization and annealing.
도 1은 종래의 집적화된 커패시터의 단면도,1 is a cross-sectional view of a conventional integrated capacitor,
도 2는 본 발명의 실시예에 의해 집적화된 수동소자의 단면도,2 is a cross-sectional view of a passive device integrated by an embodiment of the present invention;
도 3은 도 2에 도시된 커패시터와 유전체 하부전극간을 보다 상세히 나타낸 도면,3 is a view showing in more detail between the capacitor and the dielectric lower electrode shown in FIG.
도 4는 도 2에 도시된 커패시터와 유전체 상부전극간을 보다 상세히 나타낸 도면이다.FIG. 4 is a diagram illustrating in detail between the capacitor and the dielectric upper electrode illustrated in FIG. 2.
※ 도면의 주요부분에 대한 부호의 설명※ Explanation of code for main part of drawing
4 : 보호막 5 : 상부 전극4: protective film 5: upper electrode
6 : 유전체 7 : 하부 전극6 dielectric 7 lower electrode
8 : 인덕터 상부 전극 9 : 절연층 평탄화막8 inductor upper electrode 9 insulating layer planarization film
10 : 반도체 기판 11, 12, 13, 14 : 완화층10: semiconductor substrate 11, 12, 13, 14: relaxation layer
상기와 같은 목적을 달성하기 위하여 본 발명의 바람직한 실시예에 따른 박막 커패시터 제조 방법은, 실리콘 웨이퍼 기판상에 절연층 박막을 형성하는 제 1 공정; 상기 절연층 박막상에 하부 전극 패턴과 유전체 박막 패턴 및 상부 전극 패턴으로 된 집적화된 전자기소자의 커패시터를 형성하는 제 2 공정; 및 상기 제 2 공정에 의해 형성된 유전체의 상부 및 하부 표면에 다층 구조로 된 완화층을 형성하는 제 3 공정을 구비한다.In order to achieve the above object, a thin film capacitor manufacturing method according to a preferred embodiment of the present invention, the first step of forming an insulating layer thin film on a silicon wafer substrate; Forming a capacitor of an integrated electromagnetic device having a lower electrode pattern, a dielectric thin film pattern, and an upper electrode pattern on the insulating layer thin film; And a third step of forming a relaxed layer of multilayer structure on the upper and lower surfaces of the dielectric formed by the second step.
이하, 본 발명의 실시예에 따른 박막 커패시터 제조 방법에 대하여 첨부된 도면을 참조하여 설명하면 다음과 같다.Hereinafter, a thin film capacitor manufacturing method according to an embodiment of the present invention will be described with reference to the accompanying drawings.
도 2는 본 발명의 실시예에 의해 집적화된 수동소자의 단면도이고, 도 3은 도 2에 커패시터와 유전체와 하부전극간을 보다 상세히 나타낸 도면이며, 도 4는 도 2에 도시된 커패시터와 유전체 상부전극간을 보다 상세히 나타낸 도면이다.FIG. 2 is a cross-sectional view of a passive device integrated according to an embodiment of the present invention, FIG. 3 is a view illustrating in detail the capacitor, the dielectric, and the lower electrode in FIG. 2, and FIG. 4 is an upper portion of the capacitor and the dielectric shown in FIG. It is a figure which showed the electrode between in more detail.
먼저, 반도체 기판(10)위에 BPSG(boron phosphorous silicate glass)나 TEOS(tetra ethyl ortho silicate)를 이용한 산화막인 절연층 평탄화막(9)을 형성하고 그 절연층 평탄화막(9) 위에 알루미늄 산화막(Al2O3)과 티타늄 산화막(TiO2)을 증착하여 완화층(11, 12)(도 3 참조)을 만든 다음, 하부 전극(7)의 패턴과 유전체(6) PZT 박막 패턴 및 상부 전극(5) 패턴으로 된 집적화 소자의 커패시터를 형성하되 상기 상부 전극(5)은 구리(Cu)이고 상기 하부 전극(7)은 열산화와 화학적으로 안정한 백금(Pt) 또는 루세늄옥사이드(RuO)과 같은 산화 도전층을 사용한다. 이때, PZT 박막 유전체를 형성하고 어닐링하되 600 ∼ 700 ℃의 산소 분위기에서 30∼60 min 정도 어닐링한 후에 상부전극 증착 및 패터닝 공정을 진행한다. 그리고, 상기 PZT 박막 유전체(6)와 상부 전극(5) 사이에 티타늄 산화막(TiO2)과 알루미늄 산화막(Al2O3)으로 된 이중의 완화층(14, 13)(도 4 참조)을 형성한 후에 그 상부 전극(5)의 표면에 산화막 재질인 보호막(4)을 증착하고 단자 및 전극 배선 형성 공정을 진행한다.First, an insulating layer planarization film 9, which is an oxide film using boron phosphorous silicate glass (BPSG) or tetra ethyl ortho silicate (TEOS), is formed on the semiconductor substrate 10, and an aluminum oxide film (Al) is formed on the insulating layer planarization film 9. 2 O 3 ) and a titanium oxide film (TiO 2 ) to form relief layers 11 and 12 (see FIG. 3), and then the pattern of the lower electrode 7 and the dielectric material 6, the PZT thin film pattern and the upper electrode 5. To form a capacitor of an integrated device, wherein the upper electrode (5) is copper (Cu) and the lower electrode (7) is thermally oxidized and chemically stable, such as platinum (Pt) or ruthenium oxide (RuO). A conductive layer is used. At this time, the PZT thin film dielectric is formed and annealed, but annealed for about 30 to 60 min in an oxygen atmosphere of 600 to 700 ° C., and then the upper electrode deposition and patterning process is performed. In addition, double relaxation layers 14 and 13 (see FIG. 4) formed of a titanium oxide film (TiO 2 ) and an aluminum oxide film (Al 2 O 3 ) are formed between the PZT thin film dielectric 6 and the upper electrode 5. After that, a protective film 4 made of an oxide film is deposited on the surface of the upper electrode 5, and a terminal and electrode wiring forming process is performed.
상기 완화층을 구성하는 알루미늄 산화막(Al2O3)은 치밀한 구조를 가지고 있어 우수한 확산 방지막 특성을 갖는 것으로 알려져 있으나, 종래의 알루미늄 산화막(Al2O3)을 증착함에 있어서는 안정화되지 않은 에피택시(epitaxy) 방법의 공정 기술의 도입을 요구하기 때문에 현재 실용화되지 않았으며, 본 발명에서는 진공 증착기를 이용해 진공을 10-7torr 유지한 다음 알루미늄(Al)을 500 Å 정도 열증착하고 600 ∼ 700 ℃의 산소 분위기에서 30∼60 min 정도 어닐링하여 알루미늄 산화막(Al2O3)층을 형성하였다. 티타늄 산화막(TiO2)은 티타늄(Ti)을 DC 스퍼터링 방법으로 증착하되 반응성 가스로써 산소를 5∼35 % 함유하여 증착한다. 상기 알루미늄(Al)을 600 ∼ 700 ℃의 산소 분위기에서 30∼60 min 정도 어닐링할 때 티타늄 산화막(TiO2)층도 치밀화되어 누설전류의 감소 효과가 있다.Although the aluminum oxide layer (Al 2 O 3 ) constituting the alleviation layer has a dense structure and is known to have excellent diffusion barrier properties, epitaxial (unstabilized) in depositing the conventional aluminum oxide (Al 2 O 3 ) ( epitaxy) is not currently practical because it requires the introduction of a process technology of the method, in the present invention by using a vacuum evaporator to maintain a vacuum of 10 -7 torr and then thermally deposited aluminum (Al) about 500 kPa and oxygen at 600 ~ 700 ℃ Annealing for about 30 to 60 min in the atmosphere to form an aluminum oxide (Al 2 O 3 ) layer. Titanium oxide (TiO 2 ) is deposited by depositing titanium (Ti) by DC sputtering method containing 5 to 35% of oxygen as a reactive gas. When the aluminum (Al) is annealed for about 30 to 60 min in an oxygen atmosphere of 600 to 700 ° C., the titanium oxide film (TiO 2 ) layer is also densified, thereby reducing the leakage current.
상기와 같은 제조 방법으로 제조한 결과 종래의 집적화 커패시터의 유전 특성과 비교하여 본 발명의 티타늄 산화막(TiO2), 알루미늄 산화막(Al2O3)의 이중 완화층을 적용했을 때 안정적인 유전특성을 나타내었으며, 이는 간접적으로 Pb 산화막의 반응 방지 및 어닐링 공정시 Pb 휘발을 방지하여 안정한 유전 특성을 나타냄을 알 수 있고, 곧 깊이에 따른 Pb, Zr, Ti의 분포의 불균일이 상당 부분 해소됨을 알 수 있었다.As a result of the manufacturing method as described above, when the double relaxation layer of the titanium oxide film (TiO 2 ) and the aluminum oxide film (Al 2 O 3 ) of the present invention is applied, the dielectric properties are stable compared to those of the conventional integrated capacitor. Indirectly, it can be seen that indirectly, Pb volatilization is prevented during the reaction and annealing of the Pb oxide layer, thereby exhibiting stable dielectric properties. In other words, the nonuniformity of the distribution of Pb, Zr, and Ti according to the depth is solved. .
또한, 주파수 의존 특성으로 나타나는 저주파 영역의 피크의 떨림(oscillation) 현상이 없는 것으로 보아 전극과 커패시터 유전체 계면의 결함 발생도 상당 부분 억제되었음을 알 수 있으며 EPMA 분석 결과 TiO2, Al2O3이중 완화층을 형성함으로써 어닐링 공정 후에도 Pb의 휘발이나 확산이 방지되어 Pb, Zr, Ti의 조성비에는 큰 변화가 없음을 확인할 수 있다.In addition, since there is no peak oscillation phenomenon in the low frequency region, which is a characteristic of frequency dependence, the occurrence of defects at the interface between the electrode and the capacitor dielectric material is suppressed to a large extent. As a result of EPMA analysis, the TiO 2 , Al 2 O 3 double relaxation layer Formation of Pb prevents volatilization or diffusion of Pb even after the annealing process, and it can be confirmed that there is no significant change in the composition ratio of Pb, Zr, and Ti.
이상 상세히 설명한 바와 같이 본 발명에 따르면, 기존의 IC 공정에서 널리 사용하고 있는 Al2O3의 열증착 공정과 TiO2의 스퍼터링 공정을 이용하여 PZT 유전체 박막을 완성하는 커패시터의 이중 완화층을 형성하였으며, 후속 어닐링 공정에 따른 커패시터 유전체 박막내에서의 Pb의 확산 및 휘발이 방지되어 유전체 박막내의 Pb 조성을 균일하게 하고 커패시터의 유전 특성 변화를 방지하며 유전체 박막과 상·하부 전극 사이의 계면에서 발생하는 계면 결함을 줄여 상·하부 전극부위에서 전계집중 효과를 분산시키고 열적 안정성이 도모되어 커패시터의 신뢰성을 향상시킬 수 있다.As described in detail above, according to the present invention, a double relaxation layer of a capacitor for forming a PZT dielectric thin film was formed by using a thermal deposition process of Al 2 O 3 and a sputtering process of TiO 2 which are widely used in the conventional IC process. The diffusion and volatilization of Pb in the capacitor dielectric thin film is prevented by the subsequent annealing process to uniformize the Pb composition in the dielectric thin film, prevent the change of dielectric characteristics of the capacitor, and the interface generated at the interface between the dielectric thin film and the upper and lower electrodes. By reducing the defects, the field concentration effect is distributed on the upper and lower electrode portions, and the thermal stability is improved, thereby improving the reliability of the capacitor.
다시 말해서, 본 발명은 기존의 반도체 공정에서 널리 사용되고 있는 스퍼터링, PVD, CVD, RTA, annealing 공정을 이용하여 커패시터 유전체 박막과 절연막, 상·하부 전극 부위에 자리하는 계면층에 치밀한 구조의 이중 완화층(buffer layer) 구조의 막을 형성함으로써, 결정화 및 어닐링을 위한 후속 열처리 공정에서 PZT 박막 내의 Pb 확산과 휘발을 방지하게 되므로 성형된 박막내의 Pb 조성을 일정하게 유지하고 화학량론(stoichiometry)을 향상하게 된다. 그러므로, 유전 특성 변화를 방지하여 정전용량을 일정하게 유지시키며, PZT 박막과 절연막, 상·하부 전극 부위에 결함 발생을 방지하여 전계집중 효과를 줄이게 되고 커패시터의 열적 안정성이 향상되어 제조공정 수율 개선 및 커패시터 소자 동작의 장기적인 신뢰성을 증대시킬 수 있다.In other words, the present invention uses a sputtering, PVD, CVD, RTA, and annealing process, which is widely used in a conventional semiconductor process, to provide a double relief layer having a dense structure on an interface layer located at a capacitor dielectric thin film, an insulating film, and upper and lower electrode portions. The formation of a buffer layer structure prevents Pb diffusion and volatilization in the PZT thin film in subsequent heat treatment processes for crystallization and annealing, thereby maintaining a constant Pb composition in the formed thin film and improving stoichiometry. Therefore, the capacitance is kept constant by preventing the change of dielectric characteristics, and the field concentration effect is reduced by preventing the occurrence of defects in the PZT thin film, the insulating film, and the upper and lower electrode parts, and the thermal stability of the capacitor is improved, thereby improving the manufacturing process yield and Long-term reliability of capacitor device operation can be increased.
한편, 본 발명은 상술한 실시예로만 한정되는 것이 아니라 본 발명의 요지를 벗어나지 않는 범위내에서 수정 및 변형하여 실시할 수 있고, 그러한 수정 및 변형이 가해진 기술사상 역시 이하의 특허청구범위에 속하는 것으로 보아야 한다.On the other hand, the present invention is not limited only to the above-described embodiment, but can be modified and modified within the scope not departing from the gist of the present invention, the technical idea to which such modifications and variations are also applied to the claims Must see
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