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    • 4. 发明授权
    • Ionic additives for extreme low dielectric constant chemical formulations
    • 用于极低介电常数化学配方的离子添加剂
    • US06896955B2
    • 2005-05-24
    • US10219164
    • 2002-08-13
    • Robert P. MandalAlexandros T. DemosTimothy WeidmanMichael P. NaultNikolaos BekiarisScott J. WeigelLee A. SenecalJames E. MacDougalHareesh Thridandam
    • Robert P. MandalAlexandros T. DemosTimothy WeidmanMichael P. NaultNikolaos BekiarisScott J. WeigelLee A. SenecalJames E. MacDougalHareesh Thridandam
    • B05D5/12B05D7/24C01B33/16C09D5/25C09D183/02H01L21/20H01L21/314H01L21/316H01L21/768H01L23/522B32B3/00
    • H01L21/02126C01B33/16H01L21/02203H01L21/02216H01L21/02282H01L21/31695Y10S438/96Y10T428/249953Y10T428/249969
    • A process for depositing porous silicon oxide-based films using a sol-gel approach utilizing a precursor solution formulation which includes a purified nonionic surfactant and an additive among other components, where the additive is either an ionic additive or an amine additive which forms an ionic ammonium type salt in the acidic precursor solution. Using this precursor solution formulation enables formation of a film having a dielectric constant less than 2.5, appropriate mechanical properties, and minimal levels of alkali metal impurities. In one embodiment, this is achieved by purifying the surfactant and adding ionic or amine additives such as tetraalkylammonium salts and amines to the stock precursor solution. In some embodiments, the ionic additive is a compound chosen from a group of cationic additives of the general composition [NR(CH3)3]+A−, where R is a hydrophobic ligand of chain length 1 to 24, including tetramethylammonium and cetyltrimethylammonium, and A− is an anion, which may be chosen from the group consisting essentially of formate, nitrate, oxalate, acetate, phosphate, carbonate, and hydroxide and combinations thereof. Tetramethylammonium salts, or more generally tetraalkylammonium salts, or tetraorganoammonium salts or organoamines in acidic media are added to surfactant templated porous oxide precursor formulations to increase the ionic content, replacing alkali ion impurities (sodium and potassium) removed during surfactant purification, but which are found to exhibit beneficial effects in promoting the formation of the resulting dielectric.
    • 一种使用溶胶 - 凝胶方法沉积多孔氧化硅基膜的方法,该方法使用前体溶液制剂,其包含纯化的非离子表面活性剂和其它组分中的添加剂,其中添加剂是形成离子的离子添加剂或胺添加剂 铵型盐在酸性前体溶液中。 使用这种前体溶液制剂可以形成介电常数小于2.5,适当的机械性能和最低水平的碱金属杂质的薄膜。 在一个实施方案中,这通过纯化表面活性剂并将离子或胺添加剂例如四烷基铵盐和胺添加到原料前体溶液中来实现。 在一些实施方案中,离子添加剂是选自一般组成的阳离子添加剂组合物[NR(CH 3)3) 其中R是链长1至24的疏水性配体,包括四甲基铵和十六烷基三甲基铵,并且A是一种阴离子,其可以选自下组: 基本上由甲酸盐,硝酸盐,草酸盐,乙酸盐,磷酸盐,碳酸盐和氢氧化物组成。 在表面活性剂模板化的多孔氧化物前体制剂中加入四甲基铵盐或更一般的四烷基铵盐或四官能铵盐或有机胺,以增加离子含量,代替在表面活性剂纯化过程中除去的碱离子杂质(钠和钾),但发现 以促进所形成的电介质的形成。
    • 5. 发明授权
    • Capping layer for extreme low dielectric constant films
    • 用于极低介电常数膜的封盖层
    • US06875687B1
    • 2005-04-05
    • US09692527
    • 2000-10-18
    • Timothy WeidmanMichael P NaultJosephine J Chang
    • Timothy WeidmanMichael P NaultJosephine J Chang
    • C23C16/32H01L21/312H01L21/314H01L21/316H01L21/768H01L21/4763
    • H01L21/02167C23C16/325H01L21/02126H01L21/022H01L21/02203H01L21/02211H01L21/02274H01L21/02282H01L21/312H01L21/3148H01L21/31633H01L21/76807H01L21/76828H01L21/76829Y10S438/97
    • Specific embodiments of the invention provide a silicon-carbide-type or silicon oxycarbide (also often called carbon-doped-oxide [CDO] or organosilicate glass) capping material and method for depositing this capping material on ELK films which are used as a dielectric material in integrated circuits. The ELK film may include any ELK film including but not limited to inorganic, organic and hybrid dielectric materials and their respective porous versions. The silicon-carbide-type material may be an amorphous silicon carbide type material such as the commercially available BLOk™ material, or a carbon-doped oxide material such as the commercially available Black Diamond™ both of which are developed by Applied Materials of Santa Clara, Calif. The amorphous silicon carbide (a-SiC) material is deposited using a plasma process in a non-oxidizing environment and the CDO-type material is deposited using an oxygen-starved plasma process. The non-oxidative or oxygen-starved plasma processes do not significantly degrade the underlying film's chemical and electrical properties. The CDO material offers the advantageous property of having a lower dielectric constant value of less than 3.5 as opposed to the a-SiC material which has a dielectric constant of approximately 4.5. The CDO material besides, having a lower dielectric constant also has a superior adhesion characteristics to the underlying ELK material. However, experiments have indicated that despite its higher dielectric constant, the a-SiC-type material (e.g. BLOk™) may be used to generate capped ELK films with similar or even reduced dielectric constants relative to lower k capped films, and may provide composite (i.e. ELK+cap) structures exhibiting superior k stability.
    • 本发明的具体实施方案提供碳化硅型或硅碳氧化物(也通常称为碳掺杂氧化物[CDO]或有机硅酸盐玻璃)封盖材料以及用于在用作介电材料的ELK膜上沉积该封盖材料的方法 在集成电路中。 ELK膜可以包括任何ELK膜,包括但不限于无机,有机和混合电介质材料及其各自的多孔形式。 碳化硅型材料可以是非晶碳化硅型材料,例如可商购的BLOK TM材料,或者掺入碳的氧化物材料,例如可商购的Black Diamond TM,它们均由Applied 使用等离子体工艺在非氧化环境中沉积非晶碳化硅(a-SiC)材料,并使用缺氧等离子体工艺沉积CDO型材料。 非氧化或缺氧等离子体工艺不会显着降低底层薄膜的化学和电学性能。 与介电常数约为4.5的a-SiC材料相比,CDO材料提供具有小于3.5的较低介电常数值的有利特性。 除了具有较低介电常数之外,CDO材料还具有优于下面的ELK材料的粘附特性。 然而,实验已经表明,尽管其较高的介电常数,但是可以使用a-SiC型材料(例如BLOk TM)来产生相对于较低k的覆盖膜具有相似或甚至更低的介电常数的封闭的ELK膜,并且可以 提供表现出优异k稳定性的复合材料(即ELK +帽)结构。