CN101093804A - 半导体元件的形成方法 - Google Patents
半导体元件的形成方法 Download PDFInfo
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Abstract
本发明提供一种半导体元件的形成方法。此方法包括提供半导体基板,形成栅极介电层于半导体基板上,形成栅极于栅极介电层之上,形成应力源于邻近栅极边缘的半导体基板中,且在形成应力源程序后布植杂质。此杂质较佳选自下列组成的组:IV族元素、惰性元素、氟、氮及上述的组合。
Description
技术领域
本发明涉及半导体元件,特别涉及金-氧半导体元件的结构及其形成方法。
背景技术
近数十年来,半导体行业持续致力于缩小元件尺寸,增加半导体元件的速度、效能、密度以及降低单位成本。根据晶体管的设计及其内部特性,若调整栅极下方的源/漏极间的通道长度可改变通道区的电阻,由此影响晶体管的效能。特别是,缩短通道长度可降低晶体管中源极至漏极的电阻,因此当其他参数维持一定时,可增加源/漏极间的电流。
为了进一步增进MOS元件的效能,可对MOS元件中的通道施加应力,以增加载子的迁移效率。一般来说,最好对NMOS元件的通道区施加源极至漏极方向的张应力,且对PMOS元件的通道区施加源极至漏极方向的压应力。
目前半导体行业通常在源/漏极区成长SiGe应力源以对PMOS元件的通道区施加压应力。其方法包括形成栅极堆迭于半导体基板上,形成栅极间隙壁于栅极堆迭的侧壁,形成凹槽于硅基板中并对准栅极间隙壁,磊晶成长SiGe应力源于凹槽中。因为SiGe的晶格晶距比硅大,因此其可对源极SiGe应力源及漏极SiGe应力源间的通道区施加压应力。
发明内容
本发明提供一种半导体元件的形成方法,包括提供半导体基板,形成栅极介电层于半导体基板之上,形成栅极于该栅极介电层之上,形成间隙壁于邻接栅极的边缘的半导体基板中,以及在形成该应力源后布植杂质,其中该杂质选自下列组成的组:IV族元素、惰性元素、氟、氮及上述的组合。
本发明还提供一种半导体元件的形成方法,包括提供半导体基板,形成栅极介电层于该半导体基板之上,形成栅极于该栅极介电层之上,形成虚设间隙壁于该栅极及该栅极介层的边缘,沿着该虚设间隙壁的侧壁形成凹槽于该半导体基板中,磊晶成长SiGe于该凹槽中,以形成SiGe应力源,移除该虚设间隙壁,布植杂质于该SiGe应力源中,形成轻掺杂源/漏极区邻接该栅极;形成间隙壁于该栅极及该栅极介层的边缘,以及形成源/漏极区邻接该栅极。
本发明还提供一种半导体元件,包括半导体基板,栅极介电层,于该半导体基板之上,栅极,于该栅极介电层之上,以及SiGe应力源于邻接栅极的边缘的半导体基板中,此SiGe应力源包括p型杂质及含额外杂质的布植区,其中此额外杂质选自下列组成的组:氮、氟、IV族元素、惰性元素及上述组合。
本发明通过在形成应力源后形成布植区,可有效降低MOS元件的漏电流。
为了让本发明的上述和其他目的、特征和优点能更明显易懂,下文特举较佳实施例,并配合所附图示作详细说明。
附图说明
图1显示栅极堆迭形于基板100之上。
图2显示毯覆形成虚设层。
图3显示图案化毯覆氧化层及氮化层以形成栅极间隙壁。
图4显示形成磊晶区。
图5显示移除间隙壁及硬式罩幕层。
图6显示形成轻掺杂源/漏极区。
图7显示形成间隙壁。
图8显示布植p型杂质及形成硅化区。
图9显示本发明可有效改善漏电流的情况。
附图主要符号说明
100~基板;4~栅极;2~栅极介电层;6~硬式罩幕;10~毯覆氧化层;12~氮化层;14~栅极间隙壁;16~凹槽;18~磊晶区;19~布植区;D1、D2~深度;20~界面;22~箭头;24~轻掺杂源/漏极区;25~口袋/晕状区;26~间隙壁;28~重源/漏极区;T2、T1~厚度;30~硅化区;40、42~线。
具体实施方式
本发明提供一种含SiGe应力源的PMOS元件的形成方法。参照图1,栅极堆迭形于基板100之上,其较佳为硅或其他公知材质,如硅上绝缘层(SOI)。在一实施例中,可使用低锗硅比的SiGe基板。形成浅沟槽隔离区以隔离各元件区。此栅极堆迭包括栅极4于栅极介电层2之上。此栅极堆迭较佳以硬式罩幕6作为罩幕,其材质可为氧化物、氮化硅、氮氧化硅及上述的组合。
参照图2,毯覆形成虚设层。在一较佳实施例中,虚设层包括毯覆氧化层10及氮化层12。在另一实施例中,虚设层包括单层或复合层,其较佳包括氧化物、氮化硅、氮氧化硅和/或其他介电材质。此虚设层可以公知的技术形成,例如,电浆蚀刻化学气相沉积(PECVD)、低压化学气相沉积(LPCVD)、次大气压化学气相沉积(SACVD)等。
参照图3,图案化毯覆氧化层10及氮化层12以形成栅极间隙壁14,因此栅极间隙壁包括毯覆氧化部分及氮化部分。接着,沿着栅极间隙壁14形成凹槽16于基板100中,较佳为异向性蚀刻。在90nm工艺中,凹槽16的深度较佳介于约500至1000之间,更佳介于约700至900。
参照图4,以选择性磊晶成长半导体材料,较佳为SiGe,于凹槽16中以形成磊晶区18。半导体材料的晶格间距(lattice spacing)大于基板100。在磊晶成长时,可掺杂适合的杂质,但也可不掺杂。在一较佳实施例中,基板100为硅基板,SiGe成长于凹槽16中。在另一较佳实施例中,基板100包括SiGe,磊晶区18的锗含量较佳大于基板100,因此磊晶区18的晶格间隔大于基板的晶格间距。磊晶区18可对通道施加压应力。上述的磊晶区18以下亦称为SiGe应力源18。
参照图5,移除间隙壁14及硬式罩幕层6。在一实施例中,通过磷酸蚀刻来移除间隙壁14及硬式罩幕6的氮化硅区,且以稀释的氢氟酸来移除间隙壁14的毯覆氧化区。
以布植程序22形成布植区19。在一较佳实施例中,布植IV族元素,例如,碳、硅及锗。在另一实施例中,使用惰性气体,例如,氖、氩、氪、氙和/或氡。在另一实施例中,可布植氮和/或氟。应注意的是,不适当的布植会破坏SiGe应力源18产生的通道应力,且必须非常小心控制布植的能量及剂量。布植区的深度D1较佳小于SiGe应力源18的深度D2,且更佳小于SiGe应力源18深度的50%,因此不会破坏SiGe应力源18及下方基板100间的界面20接合。此外,深度D1较佳大于后续形成的轻源/漏极区及口袋/晕状区的深度,虽然D1深度亦可更深或更浅。此布植能量较佳小于约4keV,更佳介于约2keV至4keV之间,且布植剂量较佳介于约1E14/cm2至1E15/cm2之间,更佳介于5E14/cm2至7E14/cm2。因此,布植杂质的浓度小于约1E21/cm3,更佳介于1E20/cm3至5E20/cm3之间。
此外,上述所列的掺杂物,例如,碳,会降低晶格间距,而减少通道区的应力。因此,布植掺杂物的含量较佳小于锗含量。在一实施例中,布植区19中的布植掺杂物的浓度与锗浓度的比例小于约0.5%,较佳小于约0.1%。
一般而言,在布植NMOS区的源/漏极区时,较佳进行一预非晶化布植(以下简称PAI)以降低掺杂物通道效应(dopant channeling effect),且可增加掺杂物活性。如果使用相同的掺杂物,则SiGe应力源的布植较佳与NOMS的PAI同时进行。
参照图6所示,形成轻掺杂源/漏极区24。较佳以p型杂质,如硼和/或铟布植于基板100及SiGe应力源18中,另以一n型杂质,如磷和/或砷形成口袋/晕状区25。由于形成轻掺杂源/漏极区24与口袋/晕状区25的方法为公知技术,在此不再赘述,且本领域技术人员知道,形成轻掺杂源/漏极区24与布植区19的次序可颠倒。此外,在移除虚设间隙壁14前可先形成布植区19,使布植区19实质上位于SiGe应力源18内。
参照图7,形成间隙壁26。毯覆形成毯覆氧化层及氮化层。图案化氧化层及氮化层以形成间隙壁26。间隙壁26较佳具有厚度T2,且厚度T2较佳大于虚设间隙壁14的厚度T1(参照图4),但厚度T2也可相同或小于T1。
参照图8,较佳布植p型杂质,例如,硼和/或铟来形成深源/漏极区28。且深源/漏极区28实质上对准间隙壁26的边缘。图8也显示形成硅化区30,硅化区30较佳先沉积薄金属层,例如,钛、钴、镍、钨或其类似物于元件之上,包括SiGe应力源18及栅极4的曝露表面。接着,加热此基板使金属与硅接触的地方产生硅化反应。在硅化反应后,硅化物金属层形成于硅与金属之间,并选择性移除未反应的金属。
在形成SiGe应力源后形成布植区可有效地降低PMOS元件的漏电流。图9显示本发明可有效改善漏电流的情况。X轴表示以不同材质、结构、方位所形成的多个元件。Y轴表示漏电流。线40为未形成布植区于SiGe应力源的传统元件。线42为形成布植区于SiGe应力源上的元件,其中多个42表示以不同的布植种类、能量及剂量所形成的元件。结果显示,当于SiGe应力源形成布植区时,漏电流可改善约1倍以上,但其机制仍不明了,有可能与改善SiGe应力源表面有关。若SiGe应力源表面粗糙,具有凸出部分与凹陷部分,且若其粗糙的程度够大,则其后续形成的硅化物(或锗-硅化物)会趋向SiGe应力源的表面形态。形成于SiGe凹陷部分的硅化物接近于源/漏极的接合区,可能是造成漏电流的主因。通过布植程序,可减少凸出部分与凹陷部分的垂直距离,且凹陷部分可趋近于凸出部分(同时凸出部分也趋近于凹陷部分)。因此可降低漏电流的情况。
此外,于SiGe应力源上进行布植程序也可减少漏极引发能障下降效应(drain-induced barrier lowering,DIBL)。实验结果显示,当有布植碳于SiGe应力源的MOS元件时,能障下降效应比未布植的MOS元件小。在栅极尺寸约0.65μm时,可减少约10mV或6%的能障下降效应。
虽然本发明已以较佳实施例公开如上,但其并非用以限定本发明,本领域技术人员在不脱离本发明的精神和范围内,当可作些许的更动与润饰,因此本发明的保护范围应以所附的权利要求书所确定的范围为准。
Claims (16)
1.一种半导体元件的形成方法,包括
提供半导体基板;
形成栅极介电层于该半导体基板之上;
形成栅极于该栅极介电层之上;
形成应力源于邻近该栅极边缘的半导体基板中,以及
在形成该应力源后布植杂质,其中该杂质选自下列组成的组:IV族元素、惰性元素、氟、氮及上述的组合。
2.如权利要求1所述的半导体元件的形成方法,其中该半导体基板为PMOS元件,且该应力源包括SiGe。
3.如权利要求1所述的半导体元件的形成方法,其中杂质包括碳。
4.如权利要求1所述的半导体元件的形成方法,其中该布植程序的能量小于约4 keV。
5.如权利要求1所述的半导体元件的形成方法,其中该布植程序的剂量介于约1E14/cm2至1E14/cm2之间。
6.如权利要求1所述的半导体元件的形成方法,其中该杂质布植至一深度,且该深度小于应力源的深度。
7.如权利要求6所述的半导体元件的形成方法,其中该杂质的深度小于该应力源深度的50%。
8.如权利要求1所述的半导体元件的形成方法,还包括:
形成轻掺杂源/漏极区于该应力源的一部分中;
形成n型口袋/晕状区,以及
形成重掺杂源/漏极区于该应力源的至少一部分中。
9.如权利要求8所述的半导体元件的形成方法,其中该应力源形成之后,再形成该轻掺杂源/漏极区。
10.如权利要求8所述的半导体元件的形成方法,其中该应力源形成之前,先形成该轻掺杂源/漏极区。
11.一种半导体结构,包括
半导体基板;
栅极介电层,形成于该半导体基板上;
栅极,形成于该栅极介电层上,以及
应力源,形成于邻接栅极边缘的半导基板中,其中该应力源包括杂质布植区,其中该杂质选自下列组成的组:氮、氟、IV族元素、惰性元素及上述组合。
12.如权利要求11所述的半导体结构,还包括n型口袋/晕状区于该半导体基板中,以及轻掺杂源/漏极区与重掺杂源/漏极区于该应力源的至少一部分中。
13.如权利要求11所述的半导体结构,其中该杂质包括碳。
14.如权利要求11所述的半导体结构,该杂质的深度小于该应力源的深度。
15.如权利要求14所述的半导体结构,其中该杂质的深度小于该应力源深度的50%。
16.如权利要求14所述的半导体结构,其中该杂质选自下列组成的组:碳、硅、锗、氮、氟、氖、氩、氪、氙、氡及上述的组合。
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CN101093804B (zh) | 2012-02-01 |
US20070298565A1 (en) | 2007-12-27 |
TW200802625A (en) | 2008-01-01 |
US7482211B2 (en) | 2009-01-27 |
TWI335626B (en) | 2011-01-01 |
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Granted publication date: 20120201 |