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    • 8. 发明授权
    • Additional n-type LDD/pocket implant for improving short-channel NMOS ESD robustness
    • 额外的n型LDD /袋式注入,用于改善短沟道NMOS ESD稳健性
    • US06822297B2
    • 2004-11-23
    • US09876292
    • 2001-06-07
    • Mahalingam NandakumarSong ZhaoYoungmin Kim
    • Mahalingam NandakumarSong ZhaoYoungmin Kim
    • H01L2362
    • H01L29/6659H01L27/0266H01L29/1083H01L29/7833
    • A short-channel NMOS transistor in a p-well, bordered laterally on each side by an isolation region and vertically by a channel stop region, has a n-source and a n-drain, each comprising a shallow region extending to the transistor gate and a deeper region recessed from the gate, and both having a depletion region when reverse biased. The shallow regions are surrounded in part by an enhanced p-doping implant pocket. The transistor further has in these regions of enhanced p-doping another region of a p-resistivity higher than the remainder of the semiconductor. These regions extend laterally approximately from the inner border of the respective shallow region to the inner border of the respective recessed region, and vertically from a depth just below the depletion regions of source and drain to approximately the top of the channel stop regions. According to the invention, these regions of higher p-type resistivity are created after gate definition by an ion implant of compensating n-doping, such as arsenic or phosphorus, using the same photomask already used for implants creating the extended source and drain and the pockets of enhanced p-doping. In an ESD event, these regions of higher resistivity increase the current gain of the parasitic lateral npn bipolar transistor and thus raise the current It2, which initiates the thermal breakdown with its destructive localized heating, thereby improving ESD robustness.
    • p阱中的短沟道NMOS晶体管具有n源极和n沟道,每个包含延伸到晶体管栅极的浅区域,每个侧面由隔离区域横向限定并由沟道停止区域垂直地限定 以及从栅极凹陷的较深区域,并且当反向偏置时都具有耗尽区域。 浅区域部分地被增强的p掺杂注入口袋包围。 晶体管还在这些增强的p掺杂区域中具有比半导体其余部分高的p电阻率的另一区域。 这些区域大致从相应的浅区域的内部边界横向延伸到相应的凹陷区域的内部边界,并且从刚好在源极和漏极的耗尽区域的深度的深度垂直地延伸到接近通道停止区域的顶部。根据 本发明通过使用已经用于形成扩展的源极和漏极的植入物的相同的光掩模,通过补偿n掺杂的离子注入(例如砷或磷)在栅极定义之后产生这些较高p型电阻率的区域, 在ESD事件中,这些具有较高电阻率的区域增加了寄生横向npn双极晶体管的电流增益,从而提高了电流It2,从而使其具有破坏性的局部加热引起热击穿,从而提高了ESD鲁棒性。