CN101136328A - 半导体器件的栅极及其形成方法 - Google Patents

半导体器件的栅极及其形成方法 Download PDF

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CN101136328A
CN101136328A CNA2007101420984A CN200710142098A CN101136328A CN 101136328 A CN101136328 A CN 101136328A CN A2007101420984 A CNA2007101420984 A CN A2007101420984A CN 200710142098 A CN200710142098 A CN 200710142098A CN 101136328 A CN101136328 A CN 101136328A
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全东基
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Abstract

一种形成半导体器件的栅极的方法包括以下步骤的至少其中之一:在晶圆衬底上方形成栅氧化物层。在栅氧化物层上方形成多晶硅层。在多晶硅层上方形成TiSiN层。在TiSiN层上方形成WSix层。

Description

半导体器件的栅极及其形成方法
技术领域
本发明涉及在金属氧化物硅半导体器件中使用的多晶硅-硅化物结构的栅极以及形成栅极的方法。
背景技术
在金属氧化物硅(MOS)半导体器件中,栅极可具有多晶硅.硅化物结构(polycide structure)。多晶硅一硅化物结构可以通过在栅氧化物层上和/或上方依次叠层掺杂多晶硅(例如,多晶硅层)和硅化物之后进行曝光和刻蚀工艺成行构图。硅化物层可以形成为使栅极的电阻率和线电阻最小。
硅化物层中使用的材料町包括硅化钨(WSix)。硅化物层可通过使用WE6和SiH4或WF6和SiH4Cl作为反应气体的化学气相沉积而形成。在WSix形成反应期间由反应气体WE6可以生成氟(F)。氟(F)可沿着多晶硅的晶界渗入至下方栅氧化物层。渗入的氟(F)可破坏在栅氧化物层(Si02)和硅衬底的界面处的Si-O结合和/或可以增加栅氧化物层的厚度。渗入的氟(F)可引起多个器件特性问题,诸如阈值电压的迁移或饱和电流的减少。
一种方法通过反应性溅射(reactive sputtering)可以形成在约150
Figure A20071014209800041
到约1500
Figure A20071014209800042
范围内的TiN层作为WSix层和多晶硅层之间的抗扩散膜。TiN层可具有柱状结构。通过反应性溅射形成TiN层可能具有下述缺点:TiN层具有柱状结构并且柱之间的界面可作为氟(F)的扩散通道,从而限制防止氟(F))扩散的效果。
发明内容
本发明实施方式涉及一种具有多晶硅-硅化物结构的栅极的金属氧化物硅(MOS)半导体器件及形成栅极的方法。实施方式提供了形成多晶硅.硅化物栅极结构的方法,其中非晶态TiSiN层形成在多晶硅层和WSix之间以防止氟扩散。
在实施方式中,一种形成半导体器件的栅极的方法包括以下步骤的至少其中之一:在晶圆衬底上方形成栅氧化物层。在栅氧化物层上方形成多晶硅层。在多晶硅层上方形成TiSiN层。在TiSiN层上方形成WSix层。
在实施方式中,半导体器件的栅极可具有叠层结构,其中栅氧化物层、多晶硅层和WSix层顺序层迭在晶圆衬底上方,并具有在多晶硅层和WSix层之间形成的TiSiN层。
附图说明
图1A到图1E示出了根据本发明实施方式形成半导体器件的栅极的方法;
图2A到图2B为根据本发明实施方式在SiH4喷射之前和之后TiN层的微组织中的变化的透射电子显微镜(TEM)照片。
具体实施方式
如图1A所示,根据本发明实施方式,栅氧化物层2可形成在硅晶圆1上方。多晶硅层3可形成在栅氧化物层2上方。如图1B所示,TiN层4可形成在多晶硅层3上方。TiN层4可由引入至腔室并在晶圆上方热分解的四二甲基氨基钛(Tetra Dimethyl Amino Titanium缩写为DMAT)形成。在实施方式中,晶圆可保持在约300℃和约500℃之间的温度范围以及腔室内的工作压力可维持在约1托到约10托的范围。根据实施方式,TiN层4可具有非晶态结构(amorphous structure)。TiN层可包括由TDMAT(四二甲基氨基钛)生成的碳、氧或其它类似材料,其可产生高的电阻率。
如图1C所示,为了去除杂质(例如,碳和/或氧),根据实施方式可在TiN层4上执行等离子体处理以形成等离子体处理的TiN层7。等离子体处理可使用H2/N2气体等离子体5。在等离子体处理中,形成H2/N2气体等离子体并且将负偏压施加在晶圆上,从而正离子6(例如等离子体内的H+和N+)射入到TiN层4中。入射的离子可以具有高动能。由于这些离子与TiN层碰撞,由此降低TiN层内的杂质数量(例如,碳和/或氧),这可降低TiN层的电阻率。在实施方式中,为了产生并维持等离子体所施加的功率可在约500W和约1000W之间。
在实施方式中,由于等离子体处理工艺,非晶态微组织(micro tissue)可改变为具有微晶界的结晶TiN。在实施方式中,TiN层可通过金属有机化学气相沉积(MOCVD)形成。在实施方式中,TDMAT的热分解工艺和H2/N2等离子体处理可重复多次。TiN层的厚度可根据执行热分解工艺和等离子体处理的次数增加。例如,当热分解/等离子体处理执行一次时,TiN层可具有约30
Figure A20071014209800061
的厚度,而如果热分解工艺和等离子体处理执行两次,则厚度可为60
Figure A20071014209800062
。根据实施方式,TiN层的厚度可为约30
Figure A20071014209800063
和约500之间。
如图1D所示,根据实施方式,SiH4气体8喷射在等离子体处理的TiN层7上而形成TiSiN层9。根据实施方式,晶圆可维持在约300℃和约500℃之间的温度。根据实施方式,SiH4气体可以以约10sccm和约5000sccm的流速喷射约20到360秒。如果腔室内的工作压力太低,则不能有效地生成TiSiN。如果腔室内的工作压力太高,则可能生成不期望的颗粒。相应地,腔室的压力可维持在约0.1托和约10托之间。
在TiSiN层9形成期间,根据实施方式,整个TiN层7可转化成TiSiN层(例如,基于SiH4的喷射条件)。在实施方式中,可以仅部分TiN层7转化成TiSiN(例如,上部分)。TiSiN层9可具有约30
Figure A20071014209800065
和约500
Figure A20071014209800066
之间的厚度。在实施方式中,TiSiN层9的厚度可与SiH4喷射之前TiN层7的厚度基本上相同。根据实施方式,TiSiN层9可具有无晶界的非晶态结构。根据实施方式,无晶界的非晶态结构可防止将要形成的氟(F)的扩散通道和/或使将要形成的氟(F)的扩散通道最小(例如,TiSiN层9可具有相对好的防止扩散能力)。
图2A和图2B为根据实施方式在SiH4喷射之前和之后的MOCVD TiN的TEM照片。图2A为SiH4喷射之前微晶TiN的照片。图2B为在SiH4喷射之后TiN的上部分上的非晶态TiSiN(黑色部分)的照片。
如图1E所示,根据实施方式,WSix10可通过使用WF6和SiH4气体的CVD方法沉积。
在实施方式中,可以在多晶硅层上方形成TiSiN层,可以防止在沉积WSix时产生的氟(F)渗入栅氧化物层中,和/或使在沉积WSix时产生的氟(F)渗入栅氧化物层中最小。因此,根据实施方式,可以防止由于氟(F)而造成的栅氧化物的退化,和/或使由于氟(F)而造成的栅氧化物的退化最小。
对于本领域的技术人员显然可在公开的实施方式中进行各种修改和变型。因此,所公开的实施方式意在覆盖落入所附权利要求及其等同物范围内的显而易见的修改和变型。

Claims (14)

1.一种方法,包括:
在晶圆衬底上方形成栅氧化物层;
在所述栅氧化物层上方形成多晶硅层;
在所述多晶硅层上方形成TiSiN层;以及
在所述TiSiN层上方形成WSix层。
2.根据权利要求1所述的方法,其特征在于,所述方法为在半导体器件中形成栅极的方法。
3.根据权利要求1所述的方法,其特征在于,所述TiSiN层为非晶态层。
4.根据权利要求1所述的方法,其特征在于,所述形成TiSiN层的步骤包括形成TiN层。
5.根据权利要求4所述的方法,其特征在于,所述形成TiN层的步骤包括热分解四二甲基氨基钛源。
6.根据权利要求4所述的方法,其特征在于,所述形成TiSiN层的步骤包括在TiN层上执行等离子体处理以形成等离子体处理的TiN层。
7.根据权利要求6所述的方法,其特征在于,所述形成TiSiN层的步骤包括将SiH4气体喷射至等离子体处理的TiN层上。
8.一种装置包括:
在晶圆衬底上方形成的栅氧化物层;
在所述栅氧化物层上方形成的多晶硅层;
在所述多晶硅层上方形成的TiSiN层;以及
在所述TiSiN层上方形成的WSix层。
9.根据权利要求8所述的装置,其特征在于,所述装置包括半导体器件中的栅极。
10.根据权利要求8所述的装置,其特征在于,所述TiSiN层为非晶态层。
11.根据权利要求8所述的装置,其特征在于,所述TiSiN层由TiN层形成。
12.根据权利要求11所述的装置,其特征在于,所述TiN层通过热分解四二甲基氨基钛源形成。
13.根据权利要求11所述的装置,其特征在于,所述TiSiN层是通过在所述TiN层上执行等离子体处理以形成等离子体处理的TiN层的。
14.根据权利要求13所述的装置,其特征在于,所述TiSiN层是通过将SiH4气体喷射至等离子体处理的TiN层上而形成的。
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CN102023257B (zh) * 2009-09-15 2013-05-01 中芯国际集成电路制造(上海)有限公司 用于检测淹没式等离子枪工作状况的半导体器件及方法
CN103137672A (zh) * 2011-11-25 2013-06-05 上海华虹Nec电子有限公司 兼容自对准孔和表面沟道的金-氧-半场效应管的栅极膜结构及其制造方法
CN107093581A (zh) * 2016-02-17 2017-08-25 中芯国际集成电路制造(上海)有限公司 一种半导体器件及其制作方法和电子装置
CN107093581B (zh) * 2016-02-17 2020-05-15 中芯国际集成电路制造(上海)有限公司 一种半导体器件及其制作方法和电子装置

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