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    • 7. 发明授权
    • Method of forming recessed oxide isolation with reduced steepness of the
birds' neck
    • 形成凹陷氧化物隔离的方法,具有降低的脖子陡度
    • US4630356A
    • 1986-12-23
    • US777800
    • 1985-09-19
    • Rosemary ChristieBao-Tai HwangSan-Mei KuJanet M. Sickler
    • Rosemary ChristieBao-Tai HwangSan-Mei KuJanet M. Sickler
    • H01L21/76H01L21/306H01L21/308H01L21/316H01L21/762H01L21/467H01L21/94
    • H01L21/7621H01L21/3081
    • Disclosed is a method of forming in a monocrystalline silicon body an optimum recessed oxide isolation structure with reduced steepness of the bird's neck. Starting from a monocrystalline silicon body, there is formed thereon a layered structure of first silicon dioxide, polycrystalline silicon, second silicon dioxide and silicon nitride, in that order. The layers are patterned to form openings in the structure at the areas where it is desired to form the oxide isolation pattern within the silicon body. The exposed areas of the silicon body are anisotropically reactive ion etched to an initial portion of the desired depth obtaining the corresponding portion of the trench having substantially vertical walls. Then by chemical etching the trench is extended to a final portion of the desired depth obtaining inwardly sloped walls in the final portion. The body is then thermally oxidized until the desired oxide isolation penetrates to the desired depth within the silicon body.
    • 公开了一种在单晶硅体中形成具有降低的脖子陡度的最佳凹陷氧化物隔离结构的方法。 从单晶硅体开始,依次形成第一二氧化硅,多晶硅,第二二氧化硅和氮化硅的分层结构。 这些层被图案化以在期望在硅体内形成氧化物隔离图案的区域的结构中形成开口。 硅体的暴露区域是各向异性反应离子蚀刻到期望深度的初始部分,获得具有基本垂直壁的沟槽的相应部分。 然后通过化学蚀刻将沟槽延伸到所需深度的最后部分,从而获得最终部分中的向内倾斜的壁。 然后将身体热氧化直到所需的氧化物隔离渗入硅体内所需的深度。
    • 9. 发明授权
    • Method of proton-enhanced diffusion for simultaneously forming
integrated circuit regions of varying depths
    • 用于同时形成不同深度的集成电路区域的质子增强扩散方法
    • US3982967A
    • 1976-09-28
    • US562370
    • 1975-03-26
    • San-Mei KuCharles A. PillusMichael R. PoponiakRobert O. Schwenker
    • San-Mei KuCharles A. PillusMichael R. PoponiakRobert O. Schwenker
    • C30B31/22H01L21/22H01L21/265H01L21/761H01L21/263
    • H01L21/263H01L21/26506
    • In integrated circuit fabrication, a method is provided for simultaneously forming two regions of the same conductivity-type such as the base and isolation regions. In one embodiment, an epitaxial layer of one conductivity-type is formed on a substrate of opposite conductivity-type, after which dopant ions of the opposite conductivity-type are introduced into the epitaxial surface areas which are to provide the base and isolation regions, and in addition, the isolation regions are bombarded with non-dopant ions having a maximum atomic number of two, e.g., hydrogen or helium ion while the base regions are appropriately masked and remain umbombarded, said bombardment is carried out at temperatures below 300.degree. C, preferably room temperature. The bombardment is preferably carried out so that the non-dopant ions are implanted primarily in regions below the isolation regions. Next, the wafer is heated at a temperature at a range of from 600.degree. - 900.degree. C which is substantially below normal drive-in diffusion temperatures for unbombarded doped regions. The heating to be maintained for a period sufficient to drive-in diffuse the bombarded isolation regions through the epitaxial layer into contact with the substrate but is insufficient to drive-in the unbombarded base regions to such a depth.
    • 在集成电路制造中,提供了一种用于同时形成相同导电类型的两个区域的方法,例如基极和隔离区域。 在一个实施例中,在相反导电型的衬底上形成一种导电类型的外延层,之后将相反导电类型的掺杂剂离子引入到要提供基极和隔离区域的外延表面区域中, 此外,隔离区域用最大原子数为2的非掺杂离子(例如氢或氦离子)进行轰击,同时基底区域被适当地掩蔽并且保持不变,所述轰击在低于300℃的温度下进行 ,优选室温。 优选进行轰击,使得非掺杂剂离子主要被注入在隔离区域下方的区域中。 接下来,将晶片在600-900℃的温度范围内加热,这对于未掺杂的掺杂区域基本上低于正常的驱动扩散温度。 保持加热持续足以驱动的时间段将被轰击的隔离区域通过外延层与基板接触,但是不足以将未轰炸的基极区域驱动到这样的深度。