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    • 1. 发明授权
    • Self-aligned STI SONOS
    • 自对准STI SONOS
    • US07303964B2
    • 2007-12-04
    • US11113509
    • 2005-04-25
    • Hidehiko ShiraiwaMark RandolphYu Sun
    • Hidehiko ShiraiwaMark RandolphYu Sun
    • H01L21/336
    • H01L21/76229H01L27/105H01L27/115H01L27/11568H01L27/11573
    • Methods 300 and 350 are disclosed for fabricating shallow isolation trenches and structures in multi-bit SONOS flash memory devices. One method aspect 300 comprises forming 310 a multi-layer dielectric-charge trapping-dielectric stack 420 over a substrate 408 of the wafer 402, for example, an ONO stack 420, removing 312 the multi-layer dielectric-charge trapping-dielectric stack 420 in a periphery region 406 of the wafer 402, thereby defining a multi-layer dielectric-charge trapping-dielectric stack 420 in a core region 404 of the wafer 402. The method 300 further comprises forming 314 a gate dielectric layer 426 over the periphery region 406 of the substrate 408, forming 316 a first polysilicon layer 428 over the multi-layer dielectric-charge trapping-dielectric stack 420 in the core region 402 and the gate dielectric 426 in the periphery region 406 , then concurrently forming 318 an isolation trench 438 in the substrate 408 in the core region 404 and in the periphery region 406. Thereafter, the isolation trenches are filled 326 with a dielectric material 446, and a second polysilicon layer 452 that is formed 332 over the first polysilicon layer 428 and the filled trenches 438, forming an self-aligned STI structure 446. The method 300 avoids ONO residual stringers at STI edges in the periphery region, reduces active region losses, reduces thinning of the periphery gate oxide and the ONO at the STI edge, and reduces dopant diffusion during isolation implantations due to reduced thermal process steps.
    • 公开了用于在多位SONOS闪存器件中制造浅隔离沟槽和结构的方法300和350。 一个方法方面300包括在晶片402的衬底408(例如,ONO堆叠420)上形成310多层介电电荷俘获 - 电介质堆叠420,去除312多层介电电荷俘获 - 电介质堆叠420 在晶片402的外围区域406中,由此在晶片402的芯区域404中限定多层介电电荷捕获 - 电介质叠层420。 方法300还包括在衬底408的外围区域406上形成314栅极电介质层426,在芯区域402中的多层介电电荷捕获 - 电介质堆叠层420上形成316第一多晶硅层428,并且栅极 在外围区域406中的电介质426,然后同时在芯区域404和周边区域406中的衬底408中形成318隔离沟槽438。 此后,绝缘沟槽用介电材料446填充326,第二多晶硅层452在第一多晶硅层428和填充沟槽438上形成332,形成自对准STI结构446。 方法300避免在外围区域的STI边缘处的ONO残余桁条,减少有源区域损耗,减少STI边缘处的外围栅极氧化物和ONO的稀化,并且由于减少的热处理步骤,在隔离注入期间减少掺杂剂扩散。
    • 2. 发明申请
    • Self-aligned STI SONOS
    • 自对准STI SONOS
    • US20060240635A1
    • 2006-10-26
    • US11113509
    • 2005-04-25
    • Hidehiko ShiraiwaMark RandolphYu Sun
    • Hidehiko ShiraiwaMark RandolphYu Sun
    • H01L21/76
    • H01L21/76229H01L27/105H01L27/115H01L27/11568H01L27/11573
    • Methods 300 and 350 are disclosed for fabricating shallow isolation trenches and structures in multi-bit SONOS flash memory devices. One method aspect 300 comprises forming 310 a multi-layer dielectric-charge trapping-dielectric stack 420 over a substrate 408 of the wafer 402, for example, an ONO stack 420, removing 312 the multi-layer dielectric-charge trapping-dielectric stack 420 in a periphery region 406 of the wafer 402, thereby defining a multi-layer dielectric-charge trapping-dielectric stack 420 in a core region 404 of the wafer 402. The method 300 further comprises forming 314 a gate dielectric layer 426 over the periphery region 406 of the substrate 408, forming 316 a first polysilicon layer 428 over the multi-layer dielectric-charge trapping-dielectric stack 420 in the core region 402 and the gate dielectric 426 in the periphery region 406 , then concurrently forming 318 an isolation trench 438 in the substrate 408 in the core region 404 and in the periphery region 406. Thereafter, the isolation trenches are filled 326 with a dielectric material 446, and a second polysilicon layer 452 that is formed 332 over the first polysilicon layer 428 and the filled trenches 438, forming an self-aligned STI structure 446. The method 300 avoids ONO residual stringers at STI edges in the periphery region, reduces active region losses, reduces thinning of the periphery gate oxide and the ONO at the STI edge, and reduces dopant diffusion during isolation implantations due to reduced thermal process steps.
    • 公开了用于在多位SONOS闪存器件中制造浅隔离沟槽和结构的方法300和350。 一个方法方面300包括在晶片402的衬底408(例如,ONO堆叠420)上形成310多层介电电荷俘获 - 电介质堆叠420,去除312多层介电电荷俘获 - 电介质堆叠420 在晶片402的外围区域406中,由此在晶片402的芯区域404中限定多层介电电荷捕获 - 电介质叠层420.方法300还包括在周边区域314上形成314栅极电介质层426 406,在芯区域402中的多层介电 - 电荷俘获 - 电介质堆叠层420和周边区域406中的栅极电介质426之间形成316第一多晶硅层428,然后同时形成318隔离沟槽438 在核心区域404和外围区域406中的衬底408中。此后,隔离沟槽用介电材料446填充326,第二多晶硅层452形成为332o 形成第一多晶硅层428和填充沟槽438,形成自对准STI结构446.方法300避免在外围区域的STI边缘处的ONO残余桁条,减少有源区域损耗,减少外围栅极氧化物的稀化和 ONO在STI边缘,并且由于减少的热处理步骤,在隔离注入期间减少掺杂剂扩散。
    • 3. 发明授权
    • Salicided gate for virtual ground arrays
    • 用于虚拟地面阵列的闸门
    • US06730564B1
    • 2004-05-04
    • US10217821
    • 2002-08-12
    • Mark T. RamsbeyYu SunChi ChangHidehiko Shiraiwa
    • Mark T. RamsbeyYu SunChi ChangHidehiko Shiraiwa
    • H01L218247
    • H01L27/11568H01L27/105H01L27/115H01L27/11526H01L27/11534Y10S438/954
    • The present invention provides a process for saliciding word lines in a virtual ground array flash memory device without causing shorting between bit lines. According to one aspect of the invention, saliciding takes place prior to patterning one or more layers of a memory cell stack. The unpatterned layers protect the substrate between word lines from becoming salicided. The invention provides virtual ground array flash memory devices with doped and salicided word lines, but no shorting between bit lines, even in virtual ground arrays where there are no oxide island isolation regions between word lines. Potential advantages of such structures include reduced size, reduced number of processing steps, and reduced exposure to high temperature cycling.
    • 本发明提供了一种在虚拟接地阵列闪存器件中对字线进行水印处理,而不引起位线之间的短路。 根据本发明的一个方面,在对存储单元堆叠的一层或多层进行构图之前进行水化。 未图案化的层保护字线之间的基板不会变成水银。 本发明提供具有掺杂和含水字线的虚拟接地阵列闪存器件,但是即使在字线之间没有氧化物岛隔离区域的虚拟接地阵列中也不会在位线之间发生短路。 这种结构的潜在优点包括减小的尺寸,减少的加工步骤数量以及降低暴露于高温循环。