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    • 48. 发明授权
    • Dual deposition single level lift-off process
    • 双沉淀单层剥离工艺
    • US4687541A
    • 1987-08-18
    • US909804
    • 1986-09-22
    • James W. Penney
    • James W. Penney
    • G03F7/40H01L21/027H05K3/14B44C1/22B05D5/12C03C15/00C03C25/06
    • H01L21/0272G03F7/40H05K3/143Y10S438/951
    • A dual deposition liftoff process is provided for obtaining clearly defined, planar integrated circuit pattern definition. After developing a photoresist pattern on a substrate, a thin layer of sealing material which is compatible with the integrated circuit is deposited over the photoresist and the uncovered portions of the substrate. The sidewalls of the photoresist are then etched, thereby undercutting the sealing material and forming a lip which overhangs the sidewalls. A second layer of material is deposited on top of the thin layer to provide the required thickness for the integrated circuit. The overhanging lip protects the sidewalls from deposition and thus a good liftoff of the photoresist with its overlying layers is obtained.
    • 提供双沉积剥离工艺用于获得清晰定义的平面集成电路图案定义。 在衬底上显影光致抗蚀剂图案之后,与该集成电路相容的一薄层密封材料沉积在该光致抗蚀剂和该衬底的未覆盖部分上。 然后蚀刻光致抗蚀剂的侧壁,从而底切密封材料并形成突出于侧壁的唇缘。 第二层材料沉积在薄层的顶部,为集成电路提供所需的厚度。 悬垂的唇缘保护侧壁免于沉积,因此获得光致抗蚀剂及其上覆层的良好的剥离。
    • 49. 发明授权
    • Self-aligned contact process
    • 自对准接触过程
    • US4686000A
    • 1987-08-11
    • US831463
    • 1986-02-19
    • Barbara A. Heath
    • Barbara A. Heath
    • H01L29/78H01L21/033H01L21/28H01L21/283H01L21/302H01L21/3065H01L21/311H01L21/60H01L21/306B44C1/22C03C15/00C03C25/06
    • H01L21/76897H01L21/033H01L21/283H01L21/31116
    • An improved process for self-aligned contact window formation in an integrated circuit leaves a "Stick" of etch stop on vertical sidewall surfaces to be protected. The technique includes, in the preferred embodiment, a layer of oxide over active areas and on top of the gate electrode of a transistor. The oxide is thicker on top of the gate electrode than over the active area. A silicon nitride layer acting as an etch stop is included between the oxide and interlevel dielectric such as BPSG. Contact windows may deviate from their intended position and partially overlie a poly edge such as a gate electrode or an isolation (field-shield) or field oxide edge. Two-step etching comprises first etching the BPSG down to the etch stop layer, then etching the etch stop and underlying oxide, leaving a "stick" of etch stop on the side of the layer to be protected. This process preserves for the second step of the etch the differential thickness ratio of the oxide over the gate electrodes as compared to the oxide over the active area. This process allows the simultaneous formation of self-aligned contacts to field oxide, field-shield, and gate electrode edges. It is independent of the type of gate dielectric, gate electrode material, and gate electrode sidewall processing.
    • 在集成电路中自对准接触窗口形成的改进方法在要保护的垂直侧壁表面上留下蚀刻停止点的“棒”。 在优选实施例中,该技术包括在有源区上的氧化物层和晶体管的栅电极的顶部。 栅电极上方的氧化物比活性区域厚。 作为蚀刻停止层的氮化硅层包括在氧化物和层间电介质如BPSG之间。 接触窗可能偏离其预期位置,并部分覆盖多边缘,例如栅电极或隔离(场屏蔽)或场氧化物边缘。 两步蚀刻包括首先将BPSG蚀刻到蚀刻停止层,然后蚀刻蚀刻停止层和下面的氧化物,在被保护层的侧面留下“粘附”的蚀刻停止。 该过程保留蚀刻的第二步,与有源区上的氧化物相比,栅电极上的氧化物的差异厚度比。 该过程允许同时形成对场氧化物,场屏蔽和栅电极边缘的自对准接触。 它独立于栅极电介质的类型,栅电极材料和栅电极侧壁处理。