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    • 12. 发明授权
    • Method to eliminate gate filaments on field plate isolated devices
    • 在场板隔离装置上消除栅极细丝的方法
    • US5252506A
    • 1993-10-12
    • US879697
    • 1992-05-05
    • Duane E. CarterWilliam R. McKeeGishi ChungFred D. Fishburn
    • Duane E. CarterWilliam R. McKeeGishi ChungFred D. Fishburn
    • H01L21/8242H01L21/306
    • H01L27/10861
    • A method is disclosed for preventing formation of undesirable polysilicon word line gate filaments in integrated circuit devices such as VLSI dynamic random access memories employing field plate isolation. Before the word lines are processed, an oxide layer is formed in the field plate openings beneath sidewalls of nitride along the edges of the field plate openings. The oxide layer partially fills an undercut area beneath a dip out of the sidewall of nitride. The dip out of the sidewall of nitride is removed. The removal of the dip out and the partial filling of the undercut area reduces the possibility of polysilicon word line filaments from forming around the edge of the field plate openings in the undercut area when the word lines are later added. A field plate isolated memory device is also disclosed wherein along the edges of the field plate openings, the partially filling oxide layer and the sidewall nitride layer are approximately coincident.
    • 公开了一种用于防止在诸如使用场板隔离的VLSI动态随机存取存储器的集成电路器件中形成不需要的多晶硅字线栅极细丝的方法。 在处理字线之前,沿着场板开口的边缘在氮化物侧壁下方的场板开口中形成氧化物层。 氧化物层部分地填充氮化物侧壁下方的浸渍下方的底切区域。 去除氮化物侧壁的浸出。 脱落区域的去除以及部分填充底切区域减少了当字线稍后添加时,多晶硅字线细丝在底切区域的场板开口的边缘周围形成的可能性。 还公开了一种场板隔离存储器件,其中沿着场板开口的边缘,部分填充的氧化物层和侧壁氮化物层几乎重合。