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    • 10. 发明授权
    • Method for patterning sub-lithographic features in semiconductor manufacturing
    • 在半导体制造中图案化亚光刻特征的方法
    • US07300883B2
    • 2007-11-27
    • US10930228
    • 2004-08-31
    • Francis G. CeliiBrian A. SmithJames BlatchfordRobert Kraft
    • Francis G. CeliiBrian A. SmithJames BlatchfordRobert Kraft
    • H01L21/336H01L21/302H01L21/461H01L21/31H01L21/469
    • H01L21/28123H01L21/0337H01L21/0338H01L21/32139
    • A method of forming a gate electrode (24′) for a metal-oxide-semiconductor (MOS) integrated circuit is disclosed. A hardmask layer (26), for example formed of silicon-rich nitride, is deposited over a polysilicon layer (24) from which the gate electrode (24′) is to be formed. An anti-reflective coating, or bottom anti-reflective coating or BARC, layer (29) is then formed over the hardmask layer (26), and photoresist (30) is photolithographically patterned to define the pattern of the gate electrode (24′), although to a wider, photolithographic, width (LW). The pattern is transferred from the photoresist (30) to the BARC layer (29). The remaining elements of the BARC layer (29) are then trimmed, preferably by a timed isotropic etch, to a sub-lithographic width (SW). This pattern is then transferred to the hardmask layer (26) by an anisotropic etch of that layer, using the trimmed BARC elements (29) as a mask. The hardmask layer elements (26′) then mask the etch of the underlying polysilicon layer (24), to define the gate electrodes (24′), having gate widths that are narrower than the minimum dimension available through photolithography.
    • 公开了一种形成用于金属氧化物半导体(MOS)集成电路的栅电极(24')的方法。 例如由富含硅的氮化物形成的硬掩模层(26)沉积在要形成栅电极(24')的多晶硅层(24)上。 然后在硬掩模层(26)上形成抗反射涂层或底部抗反射涂层或BARC层(29),光刻图案化光致抗蚀剂(30)以限定栅电极(24')的图案, ,尽管对于更宽的光刻宽度(LW)。 图案从光致抗蚀剂(30)转移到BARC层(29)。 然后将BARC层(29)的其余元件优选地通过定时各向同性蚀刻修整到亚光刻宽度(SW)。 然后通过该层的各向异性蚀刻,使用修剪的BARC元件(29)作为掩模将该图案转移到硬掩模层(26)。 硬掩模层元件(26')然后掩蔽下面的多晶硅层(24)的蚀刻,以限定栅电极(24'),栅极宽度比通过光刻可用的最小尺寸窄。