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    • 21. 发明授权
    • Technology for high performance buried contact and tungsten polycide
gate integration
    • 技术用于高性能埋地接触和钨硅化合物门集成
    • US5998269A
    • 1999-12-07
    • US35139
    • 1998-03-05
    • Kuo-Ching HuangShou-Gwo WuuJenn-Ming HuangDun-Nian Yaung
    • Kuo-Ching HuangShou-Gwo WuuJenn-Ming HuangDun-Nian Yaung
    • H01L21/285H01L21/336H01L21/768H01L21/8244H01L21/3215H01L21/335H01L21/74
    • H01L27/11H01L21/28512H01L21/76895H01L29/66545
    • A new method of forming an improved buried contact junction is described. A gate silicon oxide layer is provided over the surface of a semiconductor substrate. A polysilicon layer is deposited overlying the gate oxide layer. A hard mask layer is deposited overlying the polysilicon layer. The hard mask and polysilicon layers are etched away where they are not covered by a mask to form a polysilicon gate electrode and interconnection lines wherein gaps are left between the gate electrode and interconnection lines. A layer of dielectric material is deposited over the semiconductor substrate to fill the gaps. The hard mask layer is removed. The polysilicon layer is etched away where it is not covered by a buried contact mask to form an opening to the semiconductor substrate. Ions are implanted to form the buried contact. A refractory metal layer is deposited overlying the buried contact and the polysilicon gate electrode and interconnection lines and planarized to form polycide gate electrodes and interconnection lines. The dielectric material layer is removed. An oxide layer is deposited and anisotropically etched to leave spacers on the sidewalls of the polycide gate electrodes and interconnection lines to complete the formation of a buried contact junction in the fabrication of an integrated circuit.
    • 描述了形成改进的埋地接触结的新方法。 在半导体衬底的表面上设置栅极氧化硅层。 沉积在栅极氧化物层上的多晶硅层。 覆盖多晶硅层的硬掩模层被沉积。 硬掩模和多晶硅层被蚀刻掉,其中它们不被掩模覆盖以形成多晶硅栅电极和互连线,其中间隙留在栅电极和互连线之间。 介电材料层沉积在半导体衬底上以填补间隙。 去除硬掩模层。 多晶硅层被蚀刻掉,其未被掩埋的接触掩模覆盖,以形成到半导体衬底的开口。 植入离子以形成埋入的接触。 沉积覆盖在掩埋触点和多晶硅栅电极和互连线上的难熔金属层并且被平坦化以形成多晶硅栅极电极和互连线。 去除介电材料层。 沉积氧化物层并各向异性蚀刻以在多晶硅栅极电极和互连线的侧壁上留下间隔物,以在集成电路的制造中完成掩埋接触结的形成。
    • 23. 发明授权
    • High-performance and reliable thin film transistor (TFT) using plasma
hydrogenation with a metal shield on the TFT channel
    • 高性能可靠的薄膜晶体管(TFT),在TFT通道上使用等离子体加氢与金属屏蔽
    • US5796150A
    • 1998-08-18
    • US899673
    • 1997-07-24
    • Shou-Gwo WuuKan-Yuan LeeMong-Song Liang
    • Shou-Gwo WuuKan-Yuan LeeMong-Song Liang
    • H01L21/8244H01L27/11H01L29/76H01L31/062H01L31/113H01L9/94
    • H01L27/11H01L27/1108Y10S257/903
    • A method for fabricating thin film transistors (TFTS) for SRAM devices is described having metal shields over the channel regions for improved electrical characteristics. The method involves forming N.sup.+ doped polysilicon TFT gate electrodes having a gate oxide thereon. An N.sup.- doped amorphous silicon is deposited and recrystallized. The recrystallized silicon is P.sup.+ doped to form the TFT source/drain areas and patterned to form the N.sup.- doped channel regions with P.sup.+ source/drain areas. After depositing an insulating layer, a metal layer is deposited and patterned to completely cover and shield the TFT channel regions from ion damage during the plasma hydrogenation which is subsequently performed. The patterned metal layer also serves as the bit lines for the SRAM device. The plasma hydrogenation reduces the surface states at the gate oxide channel interface, while the shielding effect of the metal layer from ion damaging radiation reduces the off current (I.sub.off), increases the I.sub.on /I.sub.off ratio of the TFTs, and improves the long-term reliability of the threshold voltage (V.sub.t) and swing (S) of the TFT over the unshielded TFT.
    • 描述了一种用于制造用于SRAM器件的薄膜晶体管(TFTS)的方法,其在通道区域上具有用于改善电特性的金属屏蔽。 该方法包括在其上形成具有栅极氧化物的N +掺杂多晶硅TFT栅电极。 沉积N-掺杂的非晶硅并重结晶。 再结晶的硅是P +掺杂以形成TFT源极/漏极区域并被图案化以形成具有P +源极/漏极区域的N掺杂沟道区域。 在沉积绝缘层之后,沉积和图案化金属层以完全覆盖和屏蔽TFT沟道区域,以免在后续进行的等离子体氢化期间的离子损伤。 图案化金属层也用作SRAM器件的位线。 等离子体氢化降低了栅极氧化物沟道界面处的表面状态,而金属层从离子损伤辐射的屏蔽效应降低了截止电流(Ioff),增加了TFT的离子/离子比率,并改善了长期 在非屏蔽TFT上的TFT的阈值电压(Vt)和摆动(S)的可靠性。