CN2751444Y - 具应变通道的互补式金氧半导体 - Google Patents
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- H01L29/76—Unipolar devices, e.g. field effect transistors
- H01L29/772—Field effect transistors
- H01L29/78—Field effect transistors with field effect produced by an insulated gate
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- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
- H01L21/76—Making of isolation regions between components
- H01L21/762—Dielectric regions, e.g. EPIC dielectric isolation, LOCOS; Trench refilling techniques, SOI technology, use of channel stoppers
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- H01L21/76237—Dielectric regions, e.g. EPIC dielectric isolation, LOCOS; Trench refilling techniques, SOI technology, use of channel stoppers using trench refilling with dielectric materials introducing impurities in trench side or bottom walls, e.g. for forming channel stoppers or alter isolation behavior
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- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
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- H01L21/7624—Dielectric regions, e.g. EPIC dielectric isolation, LOCOS; Trench refilling techniques, SOI technology, use of channel stoppers using semiconductor on insulator [SOI] technology
- H01L21/76264—SOI together with lateral isolation, e.g. using local oxidation of silicon, or dielectric or polycristalline material refilled trench or air gap isolation regions, e.g. completely isolated semiconductor islands
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- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
- H01L29/76—Unipolar devices, e.g. field effect transistors
- H01L29/772—Field effect transistors
- H01L29/78—Field effect transistors with field effect produced by an insulated gate
- H01L29/7842—Field effect transistors with field effect produced by an insulated gate means for exerting mechanical stress on the crystal lattice of the channel region, e.g. using a flexible substrate
- H01L29/7846—Field effect transistors with field effect produced by an insulated gate means for exerting mechanical stress on the crystal lattice of the channel region, e.g. using a flexible substrate the means being located in the lateral device isolation region, e.g. STI
Abstract
本实用新型揭示一种具应变通道的互补式金氧半导体,主要包括:一半导体基底、设置于上述半导体基底内的多个沟槽隔离区、一氮化物衬垫层、一离子布植氮化物衬垫层、一N型通道晶体管以及一P型通道晶体管。其中,相邻两沟槽隔离区之间各定义出一主动区,主动区包括一N型主动区与一P型主动区。另外,氮化物衬垫层,顺应性设置于上述N型主动区两侧的上述沟槽隔离区与上述半导体基底之间。再者,离子布植氮化物衬垫层,顺应性设置于上述P型主动区两侧的沟槽隔离区与半导体基底之间。并且,N型通道晶体管,设置于N型主动区上方。以及,P型通道晶体管,设置于P型主动区上方。
Description
技术领域
本实用新型是有关于一种场效晶体管,且特别是有关于一种包括具有拉伸应变的N型通道晶体管(NMOS)与具有压缩应力的P型通道晶体管(PMOS)的互补式金氧半场效晶体管(CMOS)组件。
背景技术
随着栅极组件尺寸的缩小化,要使金氧半场效晶体管(MOSFET)组件能在低操作电压下,具有高趋动电流和高速的效能是相当困难的。因此,许多人在努力寻求改善金氧半场效晶体管组件的效能的方法。
利用应变引发的能带结构变型来增加载子的迁移率,以增加场效晶体管的趋动电流,可改善场效晶体管组件的效能,且此种方法已被应用于各种组件中。这些组件的硅信道是处于双轴拉伸应变的情况。
已有研究指出利用硅通道处于双轴拉伸应变的情况中来增加电子的迁移率(K.Ismail et al.,“Electron transport properties in Si/SiGeheterostructures:Measurements and device applications”,Appl.Phys.Lett.63,pp.660,1993.),及利用硅锗通道处于双轴压缩应变的情况中来增加电洞的迁移率(D.K.Nayak et al.,“Enhancement-modequantum-well GeSi PMOS”,IEEE Elect.Dev.Lett.12,pp.154,1991.)。然而,结合具有双轴拉伸应变的硅通道的NMOSFETs(N型金氧半场效晶体管)及具有双轴压缩应变的硅锗通道的PMOSFETs(P型金氧半场效晶体管)的CMOS制程技术是难以达成的。在晶体管的制造上有利用厚的缓冲层或复杂多层结构等许多应变层制造方法(K.Ismail et al.,IBM,Jul.1996,Complementary metal-oxide semiconductor transistorlogic using strained Si/SiGe heterostructure layers,U.S.PatentNo.5534713.),此些方法并不易于整合到传统的CMOS制程中。
再者,更有研究提出以覆盖一层应力膜于整个晶体管上方的方式,以提供适当的应力予晶体管的通道区(A.Shimizu et al.,“Localmechanical stress control(LMC):A new technique for CMOSperformance enhancement”,pp.433-436 of the Digest of TechnicalPapers of the 2001 International Electron Device Meeting.)
然而,于通道区导入压缩应力有利于改善电动的迁移速率,却会对电子迁移率造成退化。因此,对N型通道晶体管(NMOS)而言,需要导入拉伸应力以提升电子迁移率,而对P型通道晶体管(PMOS)而言,需要导入压缩应力以提升电洞迁移率。但是在同一芯片上欲制作出同时具有拉伸应力信道区的N型信道晶体管(NMOS)与压缩应力信道区的P型信道晶体管(PMOS)的互补式金氧半导体(CMOS),却有相当的困难。
有鉴于此,本实用新型提出一种可同时具拉伸应力通道区与压缩应力通道区的半导体基底,可适用于制作互补式金氧半导体。
发明内容
本实用新型的目的在于一种具应变信道的互补式金氧半导体,使N型信道晶体管的信道区具有拉伸应力,而P型信道晶体管的信道区具有压缩应力,整合两者于同一芯片,以提升组件的操作速度。
本实用新型的主要特征之一是在于N型通道晶体管两侧的浅沟槽隔离区内顺应性形成一氮化物衬垫层,用以阻挡后续填充于浅沟槽隔离区的氧化物扩散,以避免隔离氧化物体积膨胀,并且氮化物衬垫层本身可提供N型晶体管的半导体基底通道区形成一拉伸应力。另外,将P型通道晶体管两侧的浅沟槽隔离区内的氮化物衬垫层施以离子布植,以造成氮化物衬垫层内的缺陷形成,有利于后续填充于浅沟槽隔离区的氧化物扩散,以于P型晶体管的半导体基底通道区形成一压缩应力。
为获致上述的目的,本实用新型提出一种具应变通道的互补式金氧半导体,主要是包括:一半导体基底、设置于上述半导体基底内的多个沟槽隔离区、一氮化物衬垫层、一离子布植氮化物衬垫层、一N型通道晶体管以及一P型通道晶体管。其中,相邻两上述沟槽隔离区之间各定义出一主动区,上述主动区包括一N型主动区与一P型主动区。另外,上述氮化物衬垫层,顺应性设置于上述N型主动区两侧的上述沟槽隔离区与上述半导体基底之间。再者,上述离子布植氮化物衬垫层,顺应性设置于上述P型主动区两侧的上述沟槽隔离区与上述半导体基底之间。并且,上述N型通道晶体管,设置于上述N型主动区上方。以及,上述P型通道晶体管,设置于上述P型主动区上方。
如前所述,上述半导体基底包括:一硅基底、堆栈的一硅层与一硅锗层或堆栈的一第一硅基底、一埋入绝缘层与一第二硅基底。
如前所述,上述沟槽隔离区的厚度大体为2000-6000。
如前所述,上述沟槽隔离区是由一氧化物所构成。
如前所述,本实用新型的结构更包括:一氧化物衬垫层,顺应性设置于上述氮化物衬垫层与上述半导体基底之间。
如前所述,本实用新型的结构更包括:一氧化物衬垫层,顺应性设置于上述离子布植氮化物衬垫层与上述半导体基底之间。
如前所述,上述氮化物衬垫层是由氮化硅所构成,而上述离子布植氮化物衬垫层是由被施以离子布植的氮化硅所构成。
如前所述,上述离子布植氮化物衬垫层所被施加的离子包括:硅(Si)离子、氮(N)离子、氦(He)离子、氖(Ne)离子、氩(Ar)、氙(Xe)或锗离子。
根据本实用新型,上述N型主动区的上述半导体基底表层具有一拉伸应变通道区。上述拉伸应变通道区的拉伸应变量大体为0.1%-2%。
根据本实用新型,上述P型主动区的上述半导体基底表层具有一压缩应变通道区。上述压缩应变通道区的拉伸应变量大体为0.1%-2%。
如前所述,形成上述N型通道晶体管与上述P型通道晶体管之后更包括:分别形成一应力膜,覆盖于上述N型通道晶体管与上述P型通道晶体管表面。上述应力膜是由化学气相沉积法(chemical vapor deposition;CVD)所形成。
附图说明
图1是显示根据本实用新型的具应变通道的互补式金氧半导体的一较佳实施例的制程剖面图;
图2是显示根据本实用新型的具应变通道的互补式金氧半导体的另一较佳实施例的制程剖面图;
符号说明:
100、200、300-半导体基底
102、202、302-图案化罩幕层
104a、104b、204a、204b、304a、304b-沟槽隔离区
106、206、306-氧化物衬垫层
108、208、308-氮化物衬垫层
108a-离子布植氮化物衬垫层
112、212、312-隔离氧化物
117、217、317-N型通道晶体管
116、216、316-P型通道晶体管
S100-离子布植程序
114、214、314-栅极介电层
115、215、315-栅极层
118、218、318-间隙壁
122、120、220、222、320、322-应力膜
210、311-罩幕层
S100-形成氮化物衬垫层程序
具体实施方式
实施例1:
以下请参照图1,说明根据本实用新型的具应变通道的互补式金氧半导体的一较佳实施例。
其主要是包括:一半导体基底100、多个沟槽隔离区104a、104b、一氮化物衬垫层108、一离子布植氮化物衬垫层108a、一N型通道晶体管117以及一P型通道晶体管116。
其中,沟槽隔离区104a、104b设置于半导体基底100内,且相邻两沟槽隔离区104a、104b之间各定义出一主动区,而主动区包括一N型主动区(n-井)与一P型主动区(p-井)。沟槽隔离区104a、104b内填满隔离氧化物112。
另外,氮化物衬垫层108顺应性设置于N型主动区(n-井)两侧的沟槽隔离区104b与半导体基底100之间。氮化物衬垫层108的设置为本实用新型的特征之一。氮化物衬垫层108可用以阻挡后续填充于浅沟槽隔离区的氧化物112扩散,进而避免隔离氧化物112体积膨胀,并且氮化物衬垫层本身具有拉伸应力(intrinsic tensile stress),导致对沟槽104b的侧壁施加一垂直压缩应力(vertical compressive stress)以及可提供N型晶体管117的半导体基底100通道区形成一拉伸应力。
再者,离子布植氮化物衬垫层108a顺应性设置于P型主动区(p-井)两侧的沟槽隔离区104a与半导体基底100之间。离子布植氮化物衬垫层108a内具有缺陷,有利于后续填充于浅沟槽隔离区的氧化物扩散,造成体积膨胀,以于P型晶体管116的半导体基底100通道区形成一压缩应力。
并且,N型通道晶体管117设置于N型主动区(n-井)上方。以及,P型通道晶体管116,设置于P型主动区(p-井)上方。如此一来,N型信道晶体管117下方的信道区具有一拉伸应力,可提升电子迁移率。P型信道晶体管116下方的信道区具有一压缩应力,可提升电洞迁移率。
实施例2:
以下请参照图2,说明根据本实用新型的具应变通道的互补式金氧半导体的一较佳实施例。
其主要是包括:一半导体基底200、多个沟槽隔离区204a、204b、一氮化物衬垫层208、一N型通道晶体管217以及一P型通道晶体管216。
其中,沟槽隔离区204a、204b设置于半导体基底200内,且相邻两沟槽隔离区204a、204b之间各定义出一主动区,而主动区包括一N型主动区(n-井)与一P型主动区(p-井)。沟槽隔离区204a、204b内填满隔离氧化物212。
另外,氮化物衬垫层208顺应性设置于N型主动区(n-井)两侧的沟槽隔离区204b与半导体基底200之间。氮化物衬垫层208的设置为本实用新型的特征之一。氮化物衬垫层208可用以阻挡后续填充于浅沟槽隔离区的氧化物212扩散,进而避免隔离氧化物212体积膨胀,并且氮化物衬垫层208本身具有拉伸应力(intrinsic tensile stress),导致对沟槽204b的侧壁施加一垂直压缩应力(vertical compressive stress)以及可提供N型晶体管217的半导体基底200通道区形成一拉伸应力。
然而,沟槽204a内并无氮化物衬垫层,后续填充于浅沟槽隔离区的氧化物会发生扩散,造成体积膨胀,以于P型晶体管216的半导体基底200通道区形成一压缩应力。
并且,N型通道晶体管217设置于N型主动区(n-井)上方。以及,P型通道晶体管216,设置于P型主动区(p-井)上方。如此一来,N型信道晶体管217下方的信道区具有一拉伸应力,可提升电子迁移率。P型信道晶体管216下方的信道区具有一压缩应力,可提升电洞迁移率。
实用新型优点:
1.根据本实用新型的N型通道晶体管具有拉伸应力而P型通道晶体管具有压缩应力,因此可同时提升N型信道的电子迁移率以及P型通道的电洞迁移率,有效提升组件操作速度。
2.根据本实用新型的互补式金氧半晶体管(CMOS),以简单的制成方式整合N型信道晶体管与P型信道晶体管于同一芯片,分别有适当可提升操作速度的应力。
Claims (13)
1.一种具应变通道的互补式金氧半导体,其特征在于所述互补式金氧半导体包括:
一半导体基底;
多个沟槽隔离区,设置于上述半导体基底内,使得相邻两上述沟槽隔离区之间各定义出一主动区,其中上述主动区包括一N型主动区与一P型主动区;
一氮化物衬垫层,顺应性设置于上述N型主动区两侧的上述沟槽隔离区与上述半导体基底之间;
一N型通道晶体管,设置于上述N型主动区上方;以及
一P型通道晶体管,设置于上述P型主动区上方。
2.根据权利要求1所述的具应变通道的互补式金氧半导体,其特征在于更包括:一氧化物衬垫层,顺应性设置于上述氮化物衬垫层与上述半导体基底之间。
3.根据权利要求1所述的具应变通道的互补式金氧半导体,其特征在于:上述N型主动区的上述半导体基底表层具有一拉伸应变通道区。
4.根据权利要求3所述的具应变通道的互补式金氧半导体,其特征在于:上述拉伸应变通道区的拉伸应变量为0.1%-2%。
5.根据权利要求1所述的具应变通道的互补式金氧半导体,其特征在于:上述P型主动区的上述半导体基底表层具有一压缩应变通道区。
6.根据权利要求5所述的具应变通道的互补式金氧半导体,其特征在于:上述拉伸应变通道区的拉伸应变量为0.1%-2%。
7.根据权利要求1所述的具应变通道的互补式金氧半导体,其特征在于,还包括:
一离子布植氮化物衬垫层,顺应性设置于上述P型主动区两侧的上述沟槽隔离区与上述半导体基底之间。
8.根据权利要求7所述的具应变通道的互补式金氧半导体,其特征在于更包括:一氧化物衬垫层,顺应性设置于上述氮化物衬垫层与上述半导体基底之间。
9.根据权利要求7所述的具应变通道的互补式金氧半导体,其特征在于更包括:一氧化物衬垫层,顺应性设置于上述离子布植氮化物衬垫层与上述半导体基底之间。
10.根据权利要求7所述的具应变通道的互补式金氧半导体,其特征在于:上述N型主动区的上述半导体基底表层具有一拉伸应变通道区。
11.根据权利要求7所述的具应变通道的互补式金氧半导体,其特征在于:上述拉伸应变通道区的拉伸应变量为0.1%-2%。
12.根据权利要求7所述的具应变通道的互补式金氧半导体,其特征在于:上述P型主动区的上述半导体基底表层具有一压缩应变通道区。
13.根据权利要求7所述的具应变通道的互补式金氧半导体,其特征在于:上述压缩应变通道区的拉伸应变量为0.1%-2%。
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2003
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- 2003-10-03 TW TW092127405A patent/TWI222715B/zh not_active IP Right Cessation
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2005
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CN1540757A (zh) | 2004-10-27 |
SG115690A1 (en) | 2005-10-28 |
CN1293637C (zh) | 2007-01-03 |
US6882025B2 (en) | 2005-04-19 |
US20050156274A1 (en) | 2005-07-21 |
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