CN1423834A - 用于生成四氮化三硅薄膜的超薄氧氮化物的uv预处理方法 - Google Patents
用于生成四氮化三硅薄膜的超薄氧氮化物的uv预处理方法 Download PDFInfo
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- CN1423834A CN1423834A CN01808068A CN01808068A CN1423834A CN 1423834 A CN1423834 A CN 1423834A CN 01808068 A CN01808068 A CN 01808068A CN 01808068 A CN01808068 A CN 01808068A CN 1423834 A CN1423834 A CN 1423834A
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- silicon nitride
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- oxynitride layer
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- 238000000034 method Methods 0.000 title claims description 52
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 title description 3
- 229910052710 silicon Inorganic materials 0.000 title description 3
- 239000010703 silicon Substances 0.000 title description 3
- 230000015572 biosynthetic process Effects 0.000 title description 2
- 229910052581 Si3N4 Inorganic materials 0.000 claims abstract description 53
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims abstract description 53
- 239000000758 substrate Substances 0.000 claims abstract description 28
- 239000004065 semiconductor Substances 0.000 claims abstract description 27
- 238000005229 chemical vapour deposition Methods 0.000 claims abstract description 26
- 239000007789 gas Substances 0.000 claims abstract description 19
- 239000000460 chlorine Substances 0.000 claims abstract description 18
- 229910052801 chlorine Inorganic materials 0.000 claims abstract description 15
- 230000003746 surface roughness Effects 0.000 claims abstract description 15
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims abstract description 12
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 4
- 239000010408 film Substances 0.000 claims description 35
- 238000000427 thin-film deposition Methods 0.000 claims description 10
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- 238000003672 processing method Methods 0.000 claims description 3
- 125000001309 chloro group Chemical group Cl* 0.000 claims 2
- 238000005137 deposition process Methods 0.000 claims 1
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- 230000008021 deposition Effects 0.000 abstract description 10
- 230000006911 nucleation Effects 0.000 abstract description 7
- 238000010899 nucleation Methods 0.000 abstract description 7
- 238000002203 pretreatment Methods 0.000 abstract description 7
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 21
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 11
- 150000004767 nitrides Chemical class 0.000 description 11
- 230000000694 effects Effects 0.000 description 5
- 238000012545 processing Methods 0.000 description 5
- 235000012239 silicon dioxide Nutrition 0.000 description 5
- 239000000377 silicon dioxide Substances 0.000 description 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- 238000004630 atomic force microscopy Methods 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- 229910004298 SiO 2 Inorganic materials 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N methanol Substances OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Chemical compound [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
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- 229910052724 xenon Inorganic materials 0.000 description 2
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 2
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 229910018557 Si O Inorganic materials 0.000 description 1
- 229910007991 Si-N Inorganic materials 0.000 description 1
- 229910008045 Si-Si Inorganic materials 0.000 description 1
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 1
- 229910006294 Si—N Inorganic materials 0.000 description 1
- 229910006411 Si—Si Inorganic materials 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
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- 229920005591 polysilicon Polymers 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 229910000077 silane Inorganic materials 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000009281 ultraviolet germicidal irradiation Methods 0.000 description 1
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Abstract
用UV-激发气体(如氯或氮)预处理于半导体底物上形成的氧氮化物或氧化物层,以改善层表面的状况和增加用于继后的四氮化三硅沉积的核化点的密度。这种预处理显示减少了较薄的四氮化三硅膜(物理厚度低于36,或甚至低于20)的均方根表面糙度,该四氮化三硅薄膜是用化学气相沉积法(CVD)沉积在氧氮化物层上的。
Description
发明领域
本发明一般地涉及用于ULSI应用的超薄介电薄膜表面糙度减至最小的方法。这些方法在用于通过化学气相沉积(CVD)技术于硅半导体底物上形成四氮化三硅薄膜时具有特殊的优点。
发明背景
当金属氧化物半导体场效应晶体管(MOSFET)的沟道长度减小时,栅介电厚度必须减小,以保持可接受的短沟道效应并使漏极电流最大限度地增加。由于直接隧道效应,对于薄二氧化硅(SiO2)定标的根本限制是大漏电流。栅氧化物层一般由硅半导体底物在基本纯净的氧气氛中热氧化形成。然而在超大规模集成(ULSI)电路中,这种在MOSFET中的栅氧化物层可表现出不能令人满意的特点,如较高的缺陷密度和电荷捕集,以及较低的可靠性和对于热载体效应的低耐受力。各种就地多层栅叠层方法已用于改进栅介电特性。一个实例是就地干洗硅半导体底物,继之以迅速热加工(RTP)工序。这种就地干洗一般包含三个步骤:(1)利用UV-臭氧(100托压力);(2)利用HF-甲醇蒸气(100托压力);和(3)利用UV-氯(10托压力)。UV-臭氧和UV-Cl2干洗从底物表面分别除去有机残渣和金属污染物,以制备随后所需栅介电层沉积的表面。HF-甲醇蒸气除去在UV-臭氧处理期间形成的任何表面氧化物。底物表面清洗后,要经受一系列RTP过程,这些过程包括:(1)用一氧化氮(NO)产生氧氮化物层;(2)用快速热化学气相沉积(RTCVD)法沉积氮化硅(SiNx)层;(3)在氨(NH3)环境中使底物与SiN层迅速热退火;和(4)在N2O环境中使底物迅速热退火。
已经发现当氮化物层的物理厚度约25和以下时,沉积在二氧化硅层上的CVD四氮化三硅的表面糙度不合需要地高(即均方根(RMS)糙度约10和甚至直到20)。已出版的一些研究论文指出,在四氮化三硅薄膜的物理厚度超过约20之前,氮化物核化岛的聚结不发生。参见H.Resinger和Spitzer,“Electrical Breakdown Inducedby Silicon Nitride Roughness in Thin Oxide-Nitride-OxideFilms(因薄氧化物-氮化物-氧化物膜中四氮化三硅糙度引起的电击穿)”,J.Appl.Phys.,V.79,p.3028(1996);M.Copel等,“Nucleationof Chemical Vapor Deposited Silicon Nitride on Silicon Dioxide(在二氧化硅上化学气相沉积的四氮化三硅的核化)”,Appl.Phys.Lett.,V.74,p.1830(1999);和Y.Hu等,“An In-Situ Real TimeMeasurement of the Incubation Time for SiNucleation on SiO2in a Rapid Thermal Process(对于在快速热加工过程中于SiO2上Si核化的就地实时测量)”,Appl.Phys.Lett.,V.66,p.700(1995)。
因此,由于氧化物层上的四氮化三硅薄膜的生长看来取决于有足够的核化点,所以较薄的氮化物膜已有导致不能接受的栅介电特性的不能接受的表面糙度。
有人提出解决这一问题的方法是利用低能离子束(N+,H+或He+)预处理氧氮化物表面和增加核化点。Y.Hu等,“In-situ SurfacePretreatment Effect on Nucleat ion and Film Structure ofPolysilicon in a RTCVD System(用RTCVD体系对多硅(Polysilicon)的核化和表面结构的就地表面预处理的效果)”,4thInt’1 Conf.Advanc ed Thermal Processing of Semiconductors,RTP’96,p.128(1996),近来,某些研究表明,遥控等离子氧化可改善超薄氧化物界面,参见Lucovsky等,Appl.Phys.Lett.,V.74,p.2005(1999)。遗憾的是,遥控等离子氧化需要特殊的加工设备而且用起来很复杂。其他产生更多核化点和减少薄的四氮化三硅膜表面糙度的方法正在探索中。
发明概述
在本发明中我们用UV-激发气体(优选氯(Cl2),氮(N2)和Cl2与N2的混合物)预处理在半导体底物表面上形成的氧化物或氧氮化物膜,以产生用于CVD氮化物沉积的更多的核化点。在我们的方法中,在氧氮化物层于半导体底物(优选硅半导体底物)上形成后,用UV-激发气体处理氧氮化物层。然后,在这一预处理后,四氮化三硅薄膜沉积在处理过的氧氮化物层上,优选,用快速热加工法于温度至少约800℃形成氧氮化物层。优选,用化学气相沉积(CVD)法于温度范围约700℃至约850℃,最优选700℃至800℃,和在压力范围约1.5托至约3托,并用气流比1∶40∶50的SiH4∶NH3∶Ar将四氮化三硅薄膜沉积在氧氮化物层上。
我们发现,由于这种预处理四氮化三硅的表面糙度大大减小。在一个实例中,当22.6厚的四氮化三硅层(物理厚度)沉积于未处理的氧化物上时,表面糙度RMS为9.2。相比之下,当22.5厚的四氮化三硅层(物理厚度)沉积于已经用UV-激发的氯气预处理过的氧化物层上时,表面糙度减少至RMS 2.1。因此这一方法改进了被沉积层的质量。
UV-激发气体预步骤可用于制备接受一氧化氮处理的半导体表面,产生氧氮化物层。本发明的预处理步骤是在四氮化三硅沉积步骤之前进行,以增加核化点密度和制备用于四氮化三硅工艺的氧氮化物表面层。
附图的简要说明
图1是现有技术方法的图解表示,其中四氮化三硅薄膜直接施加于未经预处理步骤的氮氧化物层上;
图2是本发明方法的图解表示,其中用UV-激发气体处理氮氧化物层是在施加四氮化三硅薄膜之前,以便产生更多的核化点和减少表面糙度;
图3A和3B是表明CVD沉积的四氮化三硅薄膜的表面结构:图3B是用而图3A是未用UV-激发的氯气预处理氧氮化物层的;和
图4是用和未用UV预处理方法的薄膜糙度对比图解。
优选具体实施方案的详细说明
图1以图解形式描述了在半导体底物上的氧化物或氧氮化物层上形成四氮化三硅层的已知现有技术方法。硅半导体底物12上沉积一个氧氮化物层14,一般是通过把半导体底物12暴露于一氧化氮(NO)气氛以氧化硅表面。氧氮化物的厚度按最终栅叠层的椭圆偏光法和电的数据一般估算为约6。此后,利用快速热化学气相沉积(CVD)法将四氮化三硅薄膜16沉积在氧氮化物层上。将带有氧氮化物层14的半导体底物12暴露于硅烷(SiH4),氨(NH3)和氩的混合物,是在密闭的室中,在压力约1.5托下。在保持该压力和在气态环境条件下,将物被加热至约800℃的温度。CVD加工可持续1秒直至数据分钟。典型的加工时间是5-60秒。在氧氮化物层上形成的四氮化三硅薄膜16的物理厚度约36一直到约20。这一栅叠层应有一个等效的二氧化硅(SiO2)厚度(EOT),为约24直至约16。考虑到栅介电技术的进展,物理厚度为20和以下的极薄四氮化三硅膜在紧接着的ULSI装置的产生中是理想的。
图2以图解形式描述了本发明的方法。UV-激发气体预处理步骤在四氮化三硅薄膜沉积在氧氮化物层上之前进行。在图1和图2中相同的参照数字指的是相同的组分。如图2中所示,UV-激发气体20施加于半导体底物12上的氧氮化物层14的表面。由于插入这一预处理步骤,氧氮化物层的表面状况在四氮化三硅薄膜测定积之前被改善。用这种方法,四氮化三硅薄膜16’的表面糙度减小,导致进一步加工的改进。为说明这一优点,在示于图2中的四氮化三硅薄膜16’的上表面上的峰和谷不如示于图1的四氮化三硅薄膜16上的峰和谷明显。
按照本发明,在四氮化三硅薄膜沉积在氧氮化物上之前,用UV-激发气体改善或调节氧氮化物层表面。在优选的具体实施方案中预处理是用UV-激发的Cl2或N2或它们的混合物进行。UV-激发的氯气是特别优选的。为了得到UV-激发气体,UV辐射是由一个具有宽波长(200-1100nm)输出的外用氙灯发射。优选,来自氙灯的光子能量为6.2-1.1eV,它高于大多数半导体底物的键能,如Si-Si=3.1eV;Si-H=3.0eV;Si-Cl=3.9eV;Si-N=4.0eV;Si-O=4.6eV。这些键在UV辐照下可被离解,但它们不能离子化,因为它们的电离电位远超过10eV。
优选的方法包括如下步骤:
(1)任选地干洗半导体底物表面,优选硅半导体底物,用UV-激发的臭氧除去有机残渣,随后用HF-甲醇蒸气处理,除去任何生成的氧化物,然后用UV-激发的氯气除去金属污染物;
(2)在压力约0.5-500托,最优选0.5-100托,于温度800℃-约1000℃将半导体底物表面暴露于一氧化氮气氛,致使热生成一个氧氮化物层;
(3)用UV-激发气体,如UV-激发的氯气或氮气或其混合物预处理该氧氮化物层,方法是在温度范围约80℃-160℃和在压力约5托-约20托下,将氧氮化物层暴露于UV-激发气体;和
(4)用化学气相沉积法将四氮化三硅薄膜沉积在预处理过的氧氮化物层上,其中在温度范围700℃-850℃,和在压力范围约1.5托-约3托用时5-35秒,优选20秒,将涂敷有氧氮化物层的半导体底物保持在SiH4∶NH3∶Ar气氛中,优选以数量比为1∶20-50∶40-60,更优选1∶40∶50。
用这种四氮化三硅沉积的方法,当预处理步骤包含在四氮化三硅薄膜沉积在氮氧化物上之前时,通过均方根(RMS)测量的表面糙度大大减小。作为本发明的附加优点,我们发现当四氮化三硅层的厚度增加时,表面糙度仍会增加,但增加的速度要比没有介入预处理步骤的沉积层所显示的速度小。因此即使在要用较厚的四氮化三硅薄膜(物理厚度大于30)时,表面状况的改进也是预料中的。因此,本发明并不只限于在形成超薄氮化物薄膜时使用。
图3A和3B比较了用和未用按照本发明所述UV-激发氯气预处理在四氮化三硅薄膜沉积于氧氮化物层上时所得到的真实表面结构。这两个图是根据有四氮化三硅薄膜沉积于其上的(图3B),和没有(图3A)按本发明的加工过程的真实半导体底物的典型原子力显微术(AFM)视图略绘的。所有的加工步骤都是在相同的条件下进行,除图3B中的样品是在化学气相沉积加工之前进行氧氮化物层的UV-激发的氯气预处理60秒,在氧氮化物层上生成四氮化之硅薄膜以外。在图3A中,半导体样品有一个物理厚度为23.5的沉积氮化物薄膜,以及其表面糙度为RMS 20。如图3A中所示,许多升高的峰和不连续性出现在氮化物薄膜表面,指示一个粗糙的表面。相比之下,在图3B中沉积的四氮化三硅薄膜的物理厚度为28.7,和表面糙度为RMS 10。用UV-激发的氯气进行预处理,使得氮化物层更均匀,具有较少的升高的峰和不连续性,表面更光滑。
已经进行了一些将本发明的方法与已知方法比较的实验。这些实施例的结果示于下面表I中。
表I
**分光椭圆光度法***原子力显微术测量
实施例 | 氧氮化物在NO环境中产生 | 预沉积处理 | CVD SiNx沉积条件(Ar=300sccm) | SE** | AFM***糙度 | |||||
压力(Torr)/温度(℃)/时间(s) | UV-Cl2UV-N2 | 压力(Torr)/温度(℃)/时间(s) | SiH4(sccm) | NH3(sccm) | 温度(℃) | 压力(Torr) | 时间(sec.) | 物理厚度SiNx() | RMS() | |
UV-1 | 0.5T/800℃/0s | UV-Cl2 | 10T/100℃/120s | 10 | 403 | 800 | 1.5 | 25 | 22.5 | 2.1 |
UV-2 | 0.5T/800℃/0s | UV-N2 | 10T/100℃/120s | 10 | 403 | 800 | 1.5 | 25 | 24.0 | 4.2 |
UV-3 | 100T/800℃/10s | UV-Cl2 | 10T/160℃/60s | 10 | 400 | 800 | 1.5 | 25 | 28.7 | 10.3 |
S-1 | 100T/800℃/10s | 无 | - | 10 | 403 | 800 | 1.5 | 25 | 22.6 | 9.2 |
S-2 | 100T/800℃/10s | 无 | - | 10 | 400 | 800 | 1.5 | 25 | 23.5 | 20.0 |
S-3 | 100T/800℃/10s | 无 | - | 10 | 400 | 800 | 1.5 | 35 | 21.8 | 5.9 |
如在上述实施例中所表明的,核化岛的聚结应当发生在氮化物厚度较薄处。在低压(0.5托)NO氧氮化和UV-Cl2预处理后,沉积的四氮化三硅(厚度=22.5)的RMS糙度为2.10,反之,在仅是标准(100托)氧氮化后沉积的氮化物(膜厚22.6)是9.2。比较实施例UV-1至实施例S-1。
图4图解显示表I中所报道的结果,标绘糙度对用CVD沉积的SiNx的薄膜总厚度图。该氧氮化物层的UV-处理明显减少了CVD沉积的氮化物糙度。
本发明的前述说明用图和实例阐明和描述了优选的具体实施方案。不过,应当懂得,本发明能够用于各种其他的组合物、变体和环境以及可在这里已经表达的本发明的概念和思想的范围内变化或改进。本发明并不想限制在这里所公开的本发明的形式。对于熟悉现有技术的人员是显而易见的。替代的具体实施方案应包括在附加的权利要求的范围内。
Claims (21)
1.一种在半导体底物表面上形成四氮化三硅薄膜的方法,其包括:
用选自氯气、氮气和它们的混合物的UV-激发气体处理在半导体底物上形成的氧氮化物薄层;和
将四氮化三硅薄膜沉积在处理过的氧氮化物层上。
2.权利要求1的方法,其中氧氮化物薄层的物理厚度为6-10。
3.权利要求1的方法,其中UV-激发气体是在压力5-20托和温度约80℃引入。
4.权利要求1的方法,其中用UV-激发气体处理氧氮化物层用时至少30秒。
5.权利要求1的方法,其中四氮化三硅薄膜的物理厚度为30或小于30。
6.权利要求1的方法,其中四氮化三硅薄膜的物理厚度范围为20-36。
7.权利要求2的方法,其中氧氮化物层是用快速热加工法于温度至少800℃在硅半导体底物上形成的。
8.权利要求5的方法,其中四氮化三硅薄膜是应用化学气相沉积法在温度范围700℃-850℃下沉积的。
9.权利要求8的方法,其中化学气相沉积是在1.5托至3托压力下进行,SiH4∶NH3∶Ar的气流比为1∶40∶50。
10.权利要求1的方法,其中UV-激发气体是氯。
11.一种减低于半导体底物上形成的四氮化三硅薄膜的均方根(RMS)表面糙度的方法,其包括:
用选自氯、氮和其混合物的UV-激发气体在四氮化三硅薄膜沉积于处理的氧氮化物层之前处理在半导体底物上形成的氧氮化物层。
12.权利要求11的方法,其中氧氮化物层的物理厚度为6-10。
13.权利要求11的方法,其中UV-激发气体在压力5-20托和温度约80℃下引入。
14.权利要求11的方法,其中用UV-激发气体处理氧氮化物层用时至少30秒。
15.权利要求11的方法,其中四氮化三硅薄膜的物理厚度为30或不到30。
16.权利要求15的方法,其中四氮化三硅薄膜的物理厚度为20-36。
17.权利要求11的方法,其中四氮化三硅薄膜的均方根表面糙度为少于5。
18.权利要求11的方法,其中氧氮化物层是利用快速热加工法于温度至少800℃在硅半导体底物上形成。
19.权利要求11的方法,其中用化学气相沉积法于温度范围700℃-850℃沉积四氮化三硅薄膜。
20.权利要求18的方法,其中化学气相沉积在压力1.5托-3.0托下进行,SiH4∶NH3∶Ar的气流比为1∶40∶50。
21.权利要求11的方法,其中UV-激发气体是氯。
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CN102737957B (zh) * | 2011-03-30 | 2015-10-21 | 东京毅力科创株式会社 | 硅氧化物膜和硅氮化物膜的层叠方法、成膜装置 |
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KR100727698B1 (ko) | 2007-06-13 |
WO2001080298A1 (en) | 2001-10-25 |
EP1275139A1 (en) | 2003-01-15 |
JP2003531490A (ja) | 2003-10-21 |
KR20030009436A (ko) | 2003-01-29 |
JP4813737B2 (ja) | 2011-11-09 |
CN1331199C (zh) | 2007-08-08 |
US6451713B1 (en) | 2002-09-17 |
ATE518239T1 (de) | 2011-08-15 |
EP1275139B1 (en) | 2011-07-27 |
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