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    • 61. 发明授权
    • Aluminum disposable spacer to reduce mask count in CMOS transistor formation
    • 铝一次性间隔物,以减少CMOS晶体管形成中的掩模数量
    • US06265253B1
    • 2001-07-24
    • US09305098
    • 1999-05-05
    • Todd LukancMatthew S. BuynoskiZicheng Gary Ling
    • Todd LukancMatthew S. BuynoskiZicheng Gary Ling
    • H01L218238
    • H01L21/823864
    • Semiconductor devices of different conductivity types with optimized junction locations are formed on a semiconductor substrate using a minimal number of critical masks. Embodiments include forming conductive gates on the main surface of the semiconductor substrate, sidewall spacers on side surfaces of the gates, and aluminum disposable spacers on the sidewall spacers. A photoresist mask is then formed on gates and portions of the main surface intended to be implanted with impurities of a first conductivity type. Moderate or heavy source/drain implants of a second impurity type are then formed in the substrate, the aluminum disposable spacers on the sidewall spacers on the unmasked gates removed, and lightly or moderately doped source/drain extension implants of the second impurity type formed in the substrate. The first mask is then removed and a second photoresist mask is formed on the previously uncovered gates and implanted portions of the main surface. Moderate or heavy source/drain implants with impurities of the first conductivity type are then formed, the remaining aluminum disposable spacers removed, and lightly or moderately doped source/drain extension implants of the first conductivity type formed. By using aluminum disposable spacers, which can be easily formed and removed without damage to other structures on the substrate, the critical masking steps for source/drain ion implantation are reduced to two, thereby reducing production costs and increasing manufacturing throughput. By employing sidewall spacers, impurities are prevented from being implanted at the edges of the gates. Thus, when source/drain junctions are formed, as by heating and diffusing the implanted impurities, they are advantageously located proximal to the gate edges, and not under the gates, thereby improving device performance.
    • 具有优化的连接位置的不同导电类型的半导体器件使用最少数量的临界掩模形成在半导体衬底上。 实施例包括在半导体衬底的主表面上形成导电栅极,在栅极的侧表面上的侧壁间隔物和侧壁间隔物上的铝一次性间隔物。 然后在主要表面的浇口和部分上形成光致抗蚀剂掩模,以便植入第一导电类型的杂质。 然后在衬底中形成第二杂质类型的中等或重的源/漏植入物,去除未屏蔽的栅极上的侧壁间隔物上的铝一次性间隔物,并且形成第二杂质类型的轻或中等掺杂的源极/漏极延伸植入物 底物。 然后去除第一掩模,并且在主表面的先前未覆盖的浇口和注入部分上形成第二光致抗蚀剂掩模。 然后形成具有第一导电类型的杂质的中等或重的源极/漏极植入物,去除剩余的铝一次性间隔物,并形成第一导电类型的轻度或中度掺杂的源极/漏极延伸植入物。 通过使用可以容易地形成和去除的铝一次性间隔件,而不损坏衬底上的其它结构,源/漏离子注入的关键掩蔽步骤减少到两个,从而降低生产成本并提高制造生产量。 通过使用侧壁间隔物,防止杂质被植入门的边缘。 因此,当形成源极/漏极结时,通过加热和扩散植入的杂质,它们有利地位于栅极边缘附近,而不在栅极下方,从而提高器件性能。
    • 62. 发明授权
    • Aluminum disposable spacer to reduce mask count in CMOS transistor formation
    • 铝一次性间隔物,以减少CMOS晶体管形成中的掩模数量
    • US06221706B1
    • 2001-04-24
    • US09268713
    • 1999-03-17
    • Todd LukancRaymond T. LeeZicheng Gary LingMatthew S. Buynoski
    • Todd LukancRaymond T. LeeZicheng Gary LingMatthew S. Buynoski
    • H01L218238
    • H01L21/823864
    • MOS semiconductor devices of different conductivity types are formed on a semiconductor substrate using a minimal number of critical masks. Embodiments include forming conductive gates on the main surface of the semiconductor substrate, and disposable aluminum sidewall spacers on the side surfaces of the gates. A photoresist mask is then formed on gates and portions of the main surface intended to be implanted with impurities of a first conductivity type. Moderate or heavy source/drain implants of a second impurity type are then formed in the substrate, the aluminum sidewall spacers on the unmasked gates are then removed, and lightly or moderately doped source/drain extension implants of the second impurity type are formed in the substrate. The first mask is then removed and a second photoresist mask is formed on the previously uncovered gates and implanted portions of the main surface. Moderate or heavy source/drain implants with impurities of the first conductivity type are then formed, the remaining aluminum sidewall spacers are removed, and lightly or moderately doped source/drain extension implants of the first conductivity type formed. By using disposable aluminum sidewall spacers, which can be easily formed and removed without damage to other structures on the substrate or to the substrate silicon, the critical masking steps for source/drain ion implantation can be reduced to two, thereby reducing production costs and increasing manufacturing throughput.
    • 使用最少数量的临界掩模,在半导体衬底上形成不同导电类型的MOS半导体器件。 实施例包括在半导体衬底的主表面上形成导电栅极和在栅极的侧表面上的一次性铝侧壁间隔物。 然后在主要表面的浇口和部分上形成光致抗蚀剂掩模,以便植入第一导电类型的杂质。 然后在衬底中形成第二杂质类型的中等或重的源/漏植入物,然后去除未屏蔽的栅极上的铝侧壁间隔物,并且在第二杂质类型中形成轻度或中度掺杂的第二杂质类型的源极/漏极延伸植入物 基质。 然后去除第一掩模,并且在主表面的先前未覆盖的浇口和注入部分上形成第二光致抗蚀剂掩模。 然后形成具有第一导电类型的杂质的中等或重的源/漏植入物,除去剩余的铝侧壁间隔物,形成第一导电类型的轻度或中度掺杂的源极/漏极延伸植入物。 通过使用可以容易地形成和去除而不损坏衬底或衬底硅上的其它结构的一次性铝侧壁间隔物,用于源/漏离子注入的关键掩蔽步骤可以减少到两个,从而降低生产成本并增加 制造吞吐量。
    • 64. 发明授权
    • Method for fabrication of a low resistivity MOSFET gate with thick metal on polysilicon
    • 在多晶硅上制造具有厚金属的低电阻率MOSFET栅极的方法
    • US06194299B1
    • 2001-02-27
    • US09325021
    • 1999-06-03
    • Matthew S. Buynoski
    • Matthew S. Buynoski
    • H01L213205
    • H01L29/66545H01L21/28061H01L21/31053H01L21/3212H01L29/4941H01L29/6659
    • The present invention is a method for fabricating a gate of a MOSFET (Metal Oxide Semiconductor Field Effect Transistor) with the gate having low resistivity. The MOSFET has a drain region, a source region, and a channel region fabricated within a semiconductor substrate, and the MOSFET initially has a gate comprised of silicide on polysilicon disposed on a gate dielectric over the channel region. Generally, the method of the present invention includes a step of depositing a first dielectric layer over the drain region, the source region, and the gate of the MOSFET. The present invention also includes steps of polishing down the first dielectric layer over the drain region and the source region, and of polishing down the first dielectric layer over the gate until the silicide over the polysilicon or the polysilicon of the gate is exposed. The present invention further includes the step of etching away the silicide and a predetermined thickness of the polysilicon if the silicide is exposed and of etching away a predetermined thickness of the polysilicon if the polysilicon is exposed, such that an opening is formed on top of a remaining portion of the polysilicon. In addition, the present invention includes the step of depositing a metal within the opening. In this manner, the gate of the present invention has low resistivity since a relatively thick layer of metal is deposited on the remaining portion of the polysilicon. However, with the present invention, the remaining portion of the polysilicon has a sufficient thickness such that a threshold voltage of the MOSFET is not substantially affected by the metal disposed on top of the remaining portion of the polysilicon.
    • 本发明是一种用于制造具有低电阻率的栅极的MOSFET(金属氧化物半导体场效应晶体管)的栅极的方法。 MOSFET具有在半导体衬底内制造的漏极区域,源极区域和沟道区域,并且MOSFET最初在沟道区域上具有由设置在栅极电介质上的多晶硅上的硅化物构成的栅极。 通常,本发明的方法包括在MOSFET的漏极区域,源极区域和栅极之上沉积第一介电层的步骤。 本发明还包括在漏极区域和源极区域上抛光第一电介质层并且在栅极上抛光第一电介质层直至硅化物超过多晶硅或栅极的多晶硅的步骤。 本发明还包括如果硅化物被暴露则蚀刻掉硅化物和预定厚度的多晶硅的步骤,并且如果多晶硅被暴露则蚀刻掉预定厚度的多晶硅,使得开口形成在 剩余部分的多晶硅。 此外,本发明包括在开口内沉积金属的步骤。 以这种方式,本发明的栅极具有低电阻率,因为相对较厚的金属层沉积在多晶硅的剩余部分上。 然而,利用本发明,多晶硅的剩余部分具有足够的厚度,使得MOSFET的阈值电压基本上不受设置在多晶硅的剩余部分顶部的金属的影响。