Method for forming high contrast alignment marks
    1.
    发明授权
    Method for forming high contrast alignment marks 失效
    形成高对比度对准标记的方法

    公开(公告)号:US5858854A

    公开(公告)日:1999-01-12

    申请号:US730382

    申请日:1996-10-16

    IPC分类号: H01L23/544 H01L21/76

    摘要: A method of forming high contrast alignment marks on an integrated circuit wafer for patterning a layer of highly reflective electrode metal is described. A method of patterning a layer of highly reflective metal on an integrated circuit wafer using high contrast alignment marks is also described. Due to a difference in height of alignment marks and contact metal surrounding the alignment marks the alignment marks are transferred to the contour of the highly reflective electrode metal. A non reflective layer of bottom anti-reflection coating material is then used to provide high contrast at the location where the edges of the alignment marks are transferred to the highly reflective electrode metal.

    摘要翻译: 描述了在用于图案化高反射电极金属层的集成电路晶片上形成高对比度对准标记的方法。 还描述了使用高对比度对准标记在集成电路晶片上图案化高反射金属层的方法。 由于对准标记的高度差和对准标记周围的接触金属的差异,对准标记被转印到高反射电极金属的轮廓上。 然后使用底部防反射涂层材料的非反射层来在对准标记的边缘被转印到高反射电极金属的位置处提供高对比度。

    Method of reducing bird's beak of field oxide using reoxidized nitrided
pad oxide layer
    2.
    发明授权
    Method of reducing bird's beak of field oxide using reoxidized nitrided pad oxide layer 失效
    使用再氧化氮化垫氧化物层减少场氧化物鸟喙的方法

    公开(公告)号:US5726091A

    公开(公告)日:1998-03-10

    申请号:US705451

    申请日:1996-08-29

    IPC分类号: H01L21/32 H01L21/76

    CPC分类号: H01L21/32

    摘要: A new method of local oxidation using an oxynitrided pad oxide layer to suppress the growth of a bird's beak is described. An oxide layer is provided over the surface of a semiconductor substrate. The oxide layer is annealed in a nitrogen atmosphere whereby the oxide layer is nitrided. The nitrided oxide layer is then reoxidized. A silicon nitride layer is deposited overlying the oxide layer. Portions of the silicon nitride and oxide layers not covered by a mask pattern are etched through to provide an opening exposing the portion of the semiconductor substrate that will form the field oxidation. The silicon substrate within the opening is oxidized wherein the semiconductor substrate is transformed to silicon dioxide wherein the nitrided oxide layer suppresses the formation of the bird's beak whereby the field oxidation is formed with a small bird's beak. The remaining oxide and silicon nitride layers are removed completing the field oxidation of the integrated circuit.

    摘要翻译: 描述了使用氧氮化氧化物层来抑制鸟的生长的局部氧化的新方法。 氧化物层设置在半导体衬底的表面上。 氧化物层在氮气气氛中退火,氧化层被氮化。 然后将氮化的氧化物层再氧化。 沉积氮化硅层覆盖氧化物层。 蚀刻通过掩模图案未覆盖的氮化硅部分和氧化物层,以提供露出将形成场氧化的半导体衬底部分的开口。 开口内的硅衬底被氧化,其中将半导体衬底转变为二氧化硅,其中氮化氧化物层抑制鸟喙的形成,由此用小鸟喙形成场氧化。 去除剩余的氧化物和氮化硅层,完成集成电路的场氧化。

    Method of improving the voltage coefficient of resistance of high polysilicon resistors
    5.
    发明授权
    Method of improving the voltage coefficient of resistance of high polysilicon resistors 有权
    提高高多晶硅电阻电阻电压系数的方法

    公开(公告)号:US06291306B1

    公开(公告)日:2001-09-18

    申请号:US09357243

    申请日:1999-07-19

    IPC分类号: H01L2120

    CPC分类号: H01L28/20 H01L27/0802

    摘要: A method of forming a high polysilicon resistor over a dielectric layer, comprising the following steps. A polysilicon resistor over a semiconductor structure is provided. The polysilicon resistor has a doped polysilicon layer having a first voltage coefficient of resistance and grain boundaries having a first trapping density. A to a first level of DC current is provided for a predetermined duration through the doped polysilicon layer to stress the doped polysilicon layer to partially melt the doped polysilicon layer without causing breakdown of the doped polysilicon layer. The to a first level of DC current is removed to allow recrystallization of the melted doped polysilicon layer, whereby the recrystallized doped polysilicon layer has a second voltage coefficient of resistance less than the first voltage coefficient of resistance and grain boundaries having a second trapping density that is less than the first trapping density. This makes the Rs of the polysilicon to be stable and saturated.

    摘要翻译: 一种在电介质层上形成高多晶硅电阻的方法,包括以下步骤。 提供了半导体结构上的多晶硅电阻器。 多晶硅电阻器具有掺杂多晶硅层,其具有第一电压电阻系数和具有第一捕获密度的晶界。 通过掺杂多晶硅层将A到第一级DC电流提供预定持续时间,以施加掺杂多晶硅层以部分地熔化掺杂多晶硅层而不引起掺杂多晶硅层的击穿。 除去第一级直流电流以允许熔融掺杂多晶硅层重结晶,由此再结晶掺杂多晶硅层具有小于第一电压系数电阻的第二电压系数和具有第二陷阱密度的晶界, 小于第一个捕获密度。 这使得多晶硅的Rs稳定和饱和。

    LOCOS field oxide and field oxide process using silicon nitride spacers
    6.
    发明授权
    LOCOS field oxide and field oxide process using silicon nitride spacers 失效
    使用氮化硅间隔物的LOCOS场氧化物和场氧化物工艺

    公开(公告)号:US5895257A

    公开(公告)日:1999-04-20

    申请号:US691288

    申请日:1996-08-01

    IPC分类号: H01L21/762 H01L21/76

    CPC分类号: H01L21/76202

    摘要: A field oxide region and method of forming a field oxide region using a LOCOS process and nitride spacers formed on the sidewalls of the field oxide regions. During the LOCOS process recesses are formed in the field oxide which result in poor step coverage during successive process steps. Nitride spacers are formed on the sidewalls of the field oxide covering the recesses. The spacers provide a smooth surface over the field oxide and improved step coverage during subsequent process steps.

    摘要翻译: 场氧化物区域和使用LOCOS工艺形成场氧化物区域的方法和形成在场氧化物区域的侧壁上的氮化物间隔物。 在LOCOS过程中,在场氧化物中形成凹陷,这在连续的工艺步骤期间导致差的台阶覆盖。 氮化物间隔物形成在覆盖凹部的场氧化物的侧壁上。 间隔物在场氧化物上提供光滑的表面,并在随后的工艺步骤中改善了台阶覆盖。

    Post tungsten etch bank anneal, to improve aluminum step coverage
    7.
    发明授权
    Post tungsten etch bank anneal, to improve aluminum step coverage 失效
    后钨蚀刻库退火,以提高铝台阶覆盖

    公开(公告)号:US5866947A

    公开(公告)日:1999-02-02

    申请号:US822247

    申请日:1997-03-20

    摘要: A process has been developed in which an aluminum based, interconnect structure overlies a tungsten plug structure, in a small diameter contact hole. The tungsten plug is formed via RIE removal of unwanted tungsten, from areas other then the contact hole using a halogen containing etchant, and using a RIE overetch cycle that creates an unwanted crevice in the center of the tungsten plug. A post RIE anneal, in a nitrogen ambient removes moisture from surrounding dielectric layers and also forms a protective, nitrogen containing tungsten layer, filling the crevice in the tungsten plug. The filling of the crevice allows a planar overlying aluminum based, interconnect structure to be obtained.

    摘要翻译: 已经开发了一种在小直径接触孔中铝基互连结构覆盖钨插塞结构的方法。 通过使用含卤素的蚀刻剂从接触孔以外的区域除去不想要的钨,并且使用在钨插塞的中心产生不想要的缝隙的RIE过蚀刻循环,来形成钨插塞。 在氮环境中的后RIE退火从周围的介电层去除水分,并且还形成保护性的含氮钨层,填充钨塞的缝隙。 缝隙的填充允许获得平面覆盖的铝基互连结构。

    MOS device structure and integration method
    8.
    发明授权
    MOS device structure and integration method 失效
    MOS器件结构和集成方法

    公开(公告)号:US5691212A

    公开(公告)日:1997-11-25

    申请号:US721665

    申请日:1996-09-27

    摘要: This invention describes a new method for forming self-aligned silicide for application in MOSFET, and a new structure of MOSFET device featuring elevated source and drain, with the objectives of reducing silicide penetration into the source and drain junctions, of eliminating junction spikes, of obtaining smoother interface between the silicide and the silicon substrate, and of reducing the chance of bridging of the silicides on the gate and on the source and drain. The new structure is made by depositing an amorphous layer of silicon on a silicon substrate already patterned with field oxide, gate oxide, polysilicon gate, and silicon nitride spacer on the gate sidewalls. Novel oxide sidewall spacers are then created by first implanting nitrogen into the horizontal surface of the amorphous silicon layer and subsequently thermally oxidizing the part of the amorphous silicon on the vertical sidewalls that is not exposed to nitrogen implantation. A dopant implantation followed by an annealing at 600.degree. C. in nitrogen converts the deposited silicon layer into elevated source and drains. A refractory metal, such as titanium is then deposited over the substrate and, upon rapid thermal annealing, reacts with the elevated source and drain polysilicon to form silicide without consuming the substrate silicon, and without ill effect on the source/drain junctions in the single crystalline silicon. The chance of silicide bridging is greatly reduced due to the special geometry of the novel sidewall oxide spacers.

    摘要翻译: 本发明描述了一种用于形成用于MOSFET中的自对准硅化物的新方法,以及具有升高的源极和漏极的MOSFET器件的新结构,其目的是减少硅化物穿入到源极和漏极结中以消除结尖峰 在硅化物和硅衬底之间获得更平滑的界面,并且减少栅极和源极和漏极上的硅化物桥接的机会。 通过在栅极侧壁上已经用场氧化物,栅极氧化物,多晶硅栅极和氮化硅间隔物图案化的硅衬底上沉积硅非晶层来制造新结构。 然后通过首先将氮注入到非晶硅层的水平表面中并随后在不暴露于氮注入的垂直侧壁上热氧化非晶硅的一部分来创建新的氧化物侧壁间隔物。 随后在氮气中在600℃退火的掺杂剂注入将沉积的硅层转化为升高的源和排水。 然后将难熔金属(例如钛)沉积在衬底上,并且在快速热退火时,与升高的源极和漏极多晶硅反应形成硅化物,而不消耗衬底硅,并且对单个源极/漏极结没有不利影响 晶体硅。 由于新型侧壁氧化物间隔物的特殊几何形状,硅化物桥接的机会大大降低。

    Method of making NMOS and PMOS LDD transistors utilizing thinned
sidewall spacers
    9.
    发明授权
    Method of making NMOS and PMOS LDD transistors utilizing thinned sidewall spacers 失效
    使用薄壁侧壁间隔物制造NMOS和PMOS LDD晶体管的方法

    公开(公告)号:US5460993A

    公开(公告)日:1995-10-24

    申请号:US415321

    申请日:1995-04-03

    CPC分类号: H01L21/823864 H01L27/0922

    摘要: A method of forming different width spacers for NMOS and PMOS in the fabrication of an integrated circuit is described. A semiconductor substrate is provided wherein NMOS and PMOS regions are separated by an isolation region. Gate electrodes are formed in the NMOS and PMOS regions. Lightly doped regions are implanted into the semiconductor substrate within the NMOS and PMOS regions. A spacer material layer is deposited over the gate electrodes in the NMOS and PMOS regions and etched away to leave spacers on the sidewalls of the gate electrodes. The NMOS region is covered with a photoresist mask. Heavily doped source and drain regions are implanted into the semiconductor substrate within the PMOS region. The photoresist mask is removed. After the PMOS implantation, a portion of the spacers is etched away to leave narrower spacers on the sidewalls of the gate electrodes. The PMOS region is covered with a photoresist mask. Heavily doped source and drain regions are implanted into the semiconductor substrate within the NMOS region. The photoresist mask is removed and the fabrication of the integrated circuit is completed.

    摘要翻译: 描述了在集成电路的制造中形成用于NMOS和PMOS的不同宽度间隔物的方法。 提供了半导体衬底,其中NMOS和PMOS区被隔离区隔开。 在NMOS和PMOS区域中形成栅电极。 轻掺杂区域注入到NMOS和PMOS区域内的半导体衬底中。 间隔材料层沉积在NMOS和PMOS区域中的栅电极上,并被蚀刻掉以在栅电极的侧壁上留下间隔物。 NMOS区域被光阻掩模覆盖。 将重掺杂的源极和漏极区域注入到PMOS区域内的半导体衬底中。 去除光致抗蚀剂掩模。 在PMOS注入之后,间隔物的一部分被蚀刻掉以在栅电极的侧壁上留下较窄的间隔物。 PMOS区域被光阻掩模覆盖。 将重掺杂的源极和漏极区域注入到NMOS区域内的半导体衬底中。 去除光致抗蚀剂掩模并完成集成电路的制造。

    Method for fabrication of w-polycide-to-poly capacitors with high
linearity
    10.
    发明授权
    Method for fabrication of w-polycide-to-poly capacitors with high linearity 失效
    制造高线性的多晶硅 - 多晶硅电容器的方法

    公开(公告)号:US5338701A

    公开(公告)日:1994-08-16

    申请号:US145154

    申请日:1993-11-03

    CPC分类号: H01L28/40

    摘要: A method of forming a polycide-to-polysilicon capacitor simultaneously with a CMOS device with polycide gate is described. Field oxide regions, n-well and p-well regions, and gate oxide regions are formed in and on a silicon substrate. A first layer of polysilicon, having a suitable doping concentration, is formed on the surface of the substrate and the field oxide regions. A layer of silicide is formed over the layer of polysilicon. The layer of silicide is ion implanted in a vertical direction to produce the low voltage coefficient and high linearity. A layer of interpoly oxide is formed over the layer of silicide. The layer of interpoly oxide is densified. A second layer of polysilicon is formed on the surface of the interpoly oxide. The second layer of polysilicon is doped, and then patterned to form the top plate of the capacitor. The layer of interpoly oxide is removed, except in the area under the top plate of the capacitor, where it acts as a capacitor dielectric. The layer of silicide and the layer of polysilicon are patterned to form a polycide bottom plate of the capacitor and to form the polycide gate. The layer of silicide is annealed. The source and drain regions of the CMOS device are formed in the substrate in the regions between the polycide gate and the field oxide regions; and the remaining layers are formed to complete the integrated circuit.

    摘要翻译: 描述了与具有多晶硅栅极的CMOS器件同时形成多晶硅多晶硅电容器的方法。 在硅衬底上形成场氧化物区域,n阱和p阱区域以及栅极氧化物区域。 在衬底和场氧化物区域的表面上形成具有合适掺杂浓度的第一多晶硅层。 在多晶硅层上形成一层硅化物。 硅化物层沿垂直方向离子注入,产生低电压系数和高线性度。 在硅化物层上形成一层多层氧化物。 层间氧化物层被致密化。 在多晶硅的表面上形成第二层多晶硅。 第二层多晶硅被掺杂,然后被图案化以形成电容器的顶板。 去除层间氧化物层,除了在电容器的顶板下方的区域中,其用作电容器电介质。 将硅化物层和多晶硅层图案化以形成电容器的多晶硅底板并形成多晶硅栅极。 硅化物层退火。 CMOS器件的源极和漏极区域在多晶硅栅极和场氧化物区域之间的区域中形成在衬底中; 并且形成剩余的层以完成集成电路。