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    • 2. 发明授权
    • Elimination of oxynitride (ONO) etch residue and polysilicon stringers
through isolation of floating gates on adjacent bitlines by polysilicon
oxidation
    • 通过多晶硅氧化隔离相邻位线上的浮栅,消除氧氮化物(ONO)蚀刻残渣和多晶硅桁架
    • US6110833A
    • 2000-08-29
    • US33836
    • 1998-03-03
    • Kathleen R. EarlyMichael K. TempletonNicholas H. TripsasMaria C. Chan
    • Kathleen R. EarlyMichael K. TempletonNicholas H. TripsasMaria C. Chan
    • A61K38/00A61K38/30H01L21/8247H01L21/70
    • H01L27/11521A61K38/30
    • A method for fabricating a first memory cell and a second memory cell electrically isolated from each other is provided. A first polysilicon (poly I) layer is formed on an oxide coated substrate. Then, a sacrificial oxide layer and nitride layer are formed for masking the poly I layer. At least a portion of the masking layer is etched to pattern the first memory cell and the second memory cell and an unmasked portion therebetween. The unmasked portion of the poly I layer is transformed into an insulator via thermal oxidation such that the insulator separates a floating gate of the first memory cell from a floating gate of the second memory cell. The insulator is etched so as to form a gap having gradually sloping sidewalls between a floating gate of the first memory cell and a floating gate of the second memory cell, the gap isolating the floating gate of the first memory cell from the floating gate of the second memory cell. Thereafter, an interpoly dielectric layer and a second polysilicon (poly II) layer are formed substantially free of abrupt changes in step height.
    • 提供了一种用于制造彼此电隔离的第一存储单元和第二存储单元的方法。 在氧化物涂覆的基底上形成第一多晶硅(poly I)层。 然后,形成用于掩蔽多晶硅层的牺牲氧化物层和氮化物层。 蚀刻掩模层的至少一部分以对第一存储单元和第二存储单元进行图案化,并且在其间形成未屏蔽部分。 多层I层的未屏蔽部分通过热氧化转变为绝缘体,使得绝缘体将第一存储器单元的浮置栅极与第二存储单元的浮置栅极分开。 绝缘体被蚀刻以形成在第一存储单元的浮动栅极和第二存储单元的浮置栅极之间具有逐渐倾斜的侧壁的间隙,将第一存储单元的浮置栅极与第一存储单元的浮动栅极隔离的间隙 第二存储单元。 此后,形成基本上不具有台阶高度突然变化的互聚电介质层和第二多晶硅(poly II)层。
    • 4. 发明授权
    • Memory cell structure for elimination of oxynitride (ONO) etch residue and polysilicon stringers
    • 用于消除氧氮化物(ONO)蚀刻残留物和多晶硅桁架的记忆单元结构
    • US06455888B1
    • 2002-09-24
    • US09506298
    • 2000-02-17
    • Kathleen R. EarlyMichael K. TempletonNicholas H. TripsasMaria C. Chan
    • Kathleen R. EarlyMichael K. TempletonNicholas H. TripsasMaria C. Chan
    • H01L29788
    • H01L27/11521A61K38/30
    • A method for fabricating a first memory cell and a second memory cell electrically isolated from each other is provided. A first polysilicon (poly I) layer is formed on an oxide coated substrate. Then, a sacrificial oxide layer and nitride layer are formed for masking the poly I layer. At least a portion of the masking layer is etched to pattern the first memory cell and the second memory cell and an unmasked portion therebetween. The unmasked portion of the poly I layer is transformed into an insulator via thermal oxidation such that the insulator separates a floating gate of the first memory cell from a floating gate of the second memory cell. The insulator is etched so as to form a gap having gradually sloping sidewalls between a floating gate of the first memory cell and a floating gate of the second memory cell, the gap isolating the floating gate of the first memory cell from the floating gate of the second memory cell. Thereafter, an interpoly dielectric layer and a second polysilicon (poly II) layer are formed substantially free of abrupt changes in step height.
    • 提供了一种用于制造彼此电隔离的第一存储单元和第二存储单元的方法。 在氧化物涂覆的基底上形成第一多晶硅(poly I)层。 然后,形成用于掩蔽多晶硅层的牺牲氧化物层和氮化物层。 蚀刻掩模层的至少一部分以对第一存储单元和第二存储单元进行图案化,并且在其间形成未屏蔽部分。 多层I层的未屏蔽部分通过热氧化转变为绝缘体,使得绝缘体将第一存储器单元的浮置栅极与第二存储单元的浮置栅极分开。 绝缘体被蚀刻以形成在第一存储单元的浮动栅极和第二存储单元的浮置栅极之间具有逐渐倾斜的侧壁的间隙,将第一存储单元的浮置栅极与第一存储单元的浮动栅极隔离的间隙 第二存储单元。 此后,形成基本上不具有台阶高度突然变化的互聚电介质层和第二多晶硅(poly II)层。