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    • 2. 发明申请
    • Novel nitride barrier layer to prevent metal (Cu) leakage issue in a dual damascene structure
    • 新型氮化物阻挡层,以防止双镶嵌结构中的金属(Cu)泄漏问题
    • US20050153537A1
    • 2005-07-14
    • US10753637
    • 2004-01-08
    • Yi-Lung ChengYing-Lung Wang
    • Yi-Lung ChengYing-Lung Wang
    • H01L21/4763H01L21/768H01L23/52
    • H01L21/76832H01L21/76807H01L21/76826
    • A method for forming a composite barrier layer that also functions as an etch stop in a damascene process is disclosed. A SiC layer is deposited on a substrate in a CVD process chamber followed by deposition of a silicon nitride layer to complete the composite barrier layer. The SiC layer exhibits excellent adhesion to a copper layer in the substrate and is formed by a method that avoids reactive Si+4 species and thereby prevents CuSiX formation. The silicon nitride layer thickness is sufficient to provide superior barrier capability to metal ions but is kept as thin as possible to minimize the dielectric constant of the composite barrier layer. The composite barrier layer provides excellent resistance to copper oxidation during oxygen ashing steps and enables a copper layer to be fabricated with a lower leakage current than when a conventional silicon nitride barrier layer is employed.
    • 公开了一种用于形成复合阻挡层的方法,该复合阻挡层也用作镶嵌工艺中的蚀刻停止。 将SiC层沉积在CVD处理室中的衬底上,随后沉积氮化硅层以完成复合势垒层。 SiC层对衬底中的铜层表现出优异的粘附性,并且通过避免反应性Si + 4+物质并由此防止CuSi X X形成的方法形成。 氮化硅层的厚度足以为金属离子提供优异的阻挡能力,但保持尽可能的薄,以使复合阻挡层的介电常数最小化。 复合阻挡层在氧化灰化步骤期间提供优异的铜氧化性能,并且与使用常规氮化硅阻挡层相比,能够以较低的漏电流制造铜层。
    • 5. 发明授权
    • Nitride barrier layer to prevent metal (Cu) leakage issue in a dual damascene structure
    • 氮化物阻挡层,以防止双重镶嵌结构中的金属(Cu)泄漏问题
    • US07176571B2
    • 2007-02-13
    • US10753637
    • 2004-01-08
    • Yi-Lung ChengYing-Lung Wang
    • Yi-Lung ChengYing-Lung Wang
    • H01L23/48H01L23/52H01L29/40
    • H01L21/76832H01L21/76807H01L21/76826
    • A method for forming a composite barrier layer that also functions as an etch stop in a damascene process is disclosed. A SiC layer is deposited on a substrate in a CVD process chamber followed by deposition of a silicon nitride layer to complete the composite barrier layer. The SiC layer exhibits excellent adhesion to a copper layer in the substrate and is formed by a method that avoids reactive Si+4 species and thereby prevents CuSiX formation. The silicon nitride layer thickness is sufficient to provide superior barrier capability to metal ions but is kept as thin as possible to minimize the dielectric constant of the composite barrier layer. The composite barrier layer provides excellent resistance to copper oxidation during oxygen ashing steps and enables a copper layer to be fabricated with a lower leakage current than when a conventional silicon nitride barrier layer is employed.
    • 公开了一种用于形成复合阻挡层的方法,该复合阻挡层也用作镶嵌工艺中的蚀刻停止。 将SiC层沉积在CVD处理室中的衬底上,随后沉积氮化硅层以完成复合势垒层。 SiC层对衬底中的铜层表现出优异的粘附性,并且通过避免反应性Si + 4+物质并由此防止CuSi X X形成的方法形成。 氮化硅层的厚度足以为金属离子提供优异的阻挡能力,但保持尽可能的薄,以使复合阻挡层的介电常数最小化。 复合阻挡层在氧化灰化步骤期间提供优异的铜氧化性能,并且与使用常规氮化硅阻挡层相比,能够以较低的漏电流制造铜层。
    • 10. 发明申请
    • Method of forming a borderless contact opening featuring a composite tri-layer etch stop material
    • 形成具有复合三层蚀刻停止材料的无边界接触开口的方法
    • US20050112859A1
    • 2005-05-26
    • US10718881
    • 2003-11-21
    • Yi-Lung ChengShih-Chia Cheng
    • Yi-Lung ChengShih-Chia Cheng
    • H01L21/31H01L21/311H01L21/44H01L21/60H01L21/768
    • H01L21/76897H01L21/31116H01L21/76802H01L21/76832
    • A method of forming an opening in a stack of insulator layers featuring an underlying etch stop layer comprised of a tri-layer insulator composite, has been developed. The tri-layer insulator composite comprised of a bottom silicon rich, silicon oxide layer and a top silicon nitride layer, is first formed on a conductive region of a semiconductor substrate. After deposition of overlying insulator layers a photoresist shape is used as a etch mask to allow the desired contact or via hole shape to be defined in the overlying insulator layers via a first phase of an anisotropic dry etch procedure, with the first phase of the dry etching procedure terminating at the top surface of the silicon nitride layer. An over etch procedure used to insure complete removal of overlying insulator layer from the surface of the tri-layer insulator composite, is next performed as a second phase of the anisotropic dry etch procedure. The high etch rate ratio of insulator layer to silicon nitride allows the over etch cycle to be successfully accomplished without risk to underlying materials. A third phase of the anisotropic dry etch procedure selectively removes the silicon nitride layer and subsequently selectively removes the silicon rich, silicon oxide layer without damage to the now exposed conductive region, resulting in definition of the desired contact or via hole openings in the stack of insulator layers.
    • 已经开发了在堆叠的绝缘体层中形成开口的方法,其特征在于由三层绝缘体复合材料构成的下面的蚀刻停止层。 首先在半导体衬底的导电区域上形成由富硅底层,氧化硅层和顶部氮化硅层组成的三层绝缘体复合体。 在沉积上覆绝缘体层之后,使用光致抗蚀剂形状作为蚀刻掩模,以允许通过各向异性干蚀刻程序的第一阶段在上覆绝缘体层中限定所需的接触或通孔形状,其中第一相干燥 蚀刻过程终止于氮化硅层的顶表面。 接下来,进行用于确保从三层绝缘体复合材料的表面完全去除上覆绝缘体层的过蚀刻程序作为各向异性干蚀刻工艺的第二阶段。 绝缘体层与氮化硅的高蚀刻速率比允许成功地实现过蚀刻循环,而不会对下面的材料造成风险。 各向异性干蚀刻过程的第三阶段选择性地去除氮化硅层,随后选择性地除去富含硅的氧化硅层,而不损害现在暴露的导电区域,导致定义了堆叠中的所需接触或通孔开口 绝缘体层。