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    • 51. 发明授权
    • Self-aligned silicidation of TFT source-drain region
    • TFT源极 - 漏极区域的自对准硅化物
    • US5834342A
    • 1998-11-10
    • US884917
    • 1997-06-30
    • Kan-Yuan LeeShou-Gwo WuuDun-Nian Yang
    • Kan-Yuan LeeShou-Gwo WuuDun-Nian Yang
    • H01L21/336H01L21/8244H01L29/417H01L29/786H01L21/265
    • H01L29/66765H01L27/11H01L29/41733H01L29/78624
    • A process for manufacturing a thin film transistor for use in a CMOS SRAM circuit is described. A key feature is the formation of two different photoresist masks from the same optical mask. The first photoresist mask is generated using a normal amount of actinic radiation during exposure and is used to protect the gate region during source and drain formation through ion implantation. The second photoresist mask is aligned relative to the gate in exactly the same orientation as the first mask but is given a reduced exposure of actinic radiation. This results, after development, in a slightly larger mask which is used during etching to form the oxide cap that will protect the channel area during the subsequent silicidation step. Making the cap slightly wider than the channel ensures that small lengths of the source and the drain regions that abut the channel are not converted to silicide. Thus, the finished device continues to act as a thin film transistor, but has greatly reduced source and drain resistances.
    • 描述用于制造用于CMOS SRAM电路的薄膜晶体管的工艺。 一个关键特征是从相同的光学掩模形成两种不同的光刻胶掩模。 在曝光期间使用正常量的光化辐射产生第一光致抗蚀剂掩模,并且用于通过离子注入在源极和漏极形成期间保护栅极区域。 第二光致抗蚀剂掩模相对于栅极以与第一掩模完全相同的取向对准,但被给予光化辐射的减少的曝光。 这在显影之后产生了在蚀刻期间用于形成氧化物盖的稍大的掩模,其将在随后的硅化步骤期间保护沟道区域。 使帽子比通道略宽,确保抵靠通道的源极和漏极区域的较小长度不会转化为硅化物。 因此,成品器件继续作为薄膜晶体管,但是极大地降低了源极和漏极电阻。
    • 52. 发明授权
    • Method for concurrently making thin-film-transistor (TFT) gate
electrodes and ohmic contacts at P/N junctions for TFT-static random
    • 同时制造薄膜晶体管(TFT)栅电极和欧姆接触的P / N结用于TFT-静态随机的方法
    • US5731232A
    • 1998-03-24
    • US745639
    • 1996-11-08
    • Shou-Gwo WuuMong-Song Liang
    • Shou-Gwo WuuMong-Song Liang
    • H01L21/84H01L21/00
    • H01L21/84Y10S257/903
    • A method is achieved for making TFT-load static random access memory (SRAM) cells where the thin film transistor (TFT) gate electrodes are made from an electrical conductor. At the same time, portions of the conductor between P and N doped polysilicon interconnections eliminate the P/N junction. Ohmic contacts are formed while avoiding additional processing steps. N-channel FET gate electrodes are formed from an N.sup.+ doped first polysilicon layer having a first insulating layer thereon. Second polySi interconnections are formed with a second insulating layer thereon. First contact openings are etched in the first and second insulating layers to the N.sup.+ doped FET gate electrodes, and a patterned conductor (TiN, TiSi.sub.2) forms the P-channel TFT gate electrodes and concurrently forms portions over and in the first contact openings. A TFT gate oxide is formed and second contact openings are etched over the first contact openings to the conductor. An N.sup.- doped third polySi layer is deposited, selectively doped P.sup.+ and patterned to form the TFT N.sup.- doped channel, the P.sup.+ doped source/drains, and the interconnection in the contact openings to the N-FET gate electrodes. The conductor at the interface between the P/N polySi forms essentially ohmic contacts, thereby eliminating the P/N junction and improving circuit performance.
    • 实现了薄膜晶体管(TFT)栅电极由电导体制成的TFT负载静态随机存取存储器(SRAM)单元的方法。 同时,P和N掺杂多晶硅互连之间的导体部分消除了P / N结。 在避免额外的处理步骤的同时形成欧姆接触。 N沟道FET栅极由其上具有第一绝缘层的N +掺杂的第一多晶硅层形成。 第二多晶硅互连在其上形成有第二绝缘层。 第一接触开口在第一和第二绝缘层中蚀刻到N +掺杂FET栅电极,并且图案化导体(TiN,TiSi 2)形成P沟道TFT栅电极,同时在第一接触开口上并在其中形成部分。 形成TFT栅极氧化物,并且第二接触开口在第一接触开口上蚀刻到导体。 沉积N-掺杂的第三多晶硅层,选择性掺杂P +并图案化以形成TFT N掺杂沟道,P +掺杂源极/漏极以及在N-FET栅电极的接触开口中的互连。 在P / N多晶硅之间的界面处的导体形成基本的欧姆接触,从而消除P / N结并提高电路性能。