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    • 84. 发明授权
    • Low bitline capacitance structure and method of making same
    • 低位线电容结构及其制作方法
    • US06426247B1
    • 2002-07-30
    • US09764824
    • 2001-01-17
    • Ramachandra DivakaruniJeffrey P. GambinoJack A. MandelmanRajesh Rengarajan
    • Ramachandra DivakaruniJeffrey P. GambinoJack A. MandelmanRajesh Rengarajan
    • H01L21338
    • H01L27/10888H01L23/485H01L27/10861H01L27/10885H01L2924/0002H01L2924/00
    • A method for forming a memory device having low bitline capacitance, comprising: providing a gate conductor stack structure on a silicon substrate, said gate stack structure having a gate oxide layer, a polysilicon layer, a silicide layer, and a top dielectric nitride layer; oxidizing sidewalls of said gate oxide stack; forming sidewall spacers on the sidewalls of said gate conductor stack, said sidewall spacers comprising a thin layer of nitride having a thickness ranging from about 50 to about 250 angstroms; overlaying the gate structure with a thin nitride liner having a thickness ranging from about 25 to about 150 angstroms; depositing an insulative oxide layer over the gate structure; polishing the insulative oxide layer down to the level of the nitride liner of the gate structure; patterning and etching the insulative oxide layer to expose said nitride liner; forming second sidewall spacers over said first sidewall spacers, said second sidewall spacers comprising an oxide layer having a thickness ranging from about 100 to about 400 angstroms; and, depositing and planarizing a layer of polysilicon covering said gate structure and the sidewall spacers.
    • 一种用于形成具有低位线电容的存储器件的方法,包括:在硅衬底上提供栅极导体堆叠结构,所述栅堆叠结构具有栅极氧化层,多晶硅层,硅化物层和顶部电介质氮化物层; 氧化所述栅极氧化层的侧壁; 在所述栅极导体堆叠的侧壁上形成侧壁间隔物,所述侧壁间隔物包括厚度范围为约50至约250埃的薄氮化物层; 用具有约25至约150埃的厚度的薄氮化物衬垫覆盖栅极结构; 在栅极结构上沉积绝缘氧化物层; 将绝缘氧化物层抛光到栅极结构的氮化物衬垫的水平面; 图案化和蚀刻绝缘氧化物层以暴露所述氮化物衬垫; 在所述第一侧壁间隔物上形成第二侧壁间隔物,所述第二侧壁间隔物包括厚度范围为约100至约400埃的氧化物层; 并且沉积和平坦化覆盖所述栅极结构和侧壁间隔物的多晶硅层。
    • 87. 发明授权
    • Structure and process for fabricating a 6F2 DRAM cell having vertical MOSFET and large trench capacitance
    • 用于制造具有垂直MOSFET和大沟槽电容的6F2 DRAM单元的结构和工艺
    • US06288422B1
    • 2001-09-11
    • US09540276
    • 2000-03-31
    • Jack A. MandelmanRama DivakaruniCarl Radens
    • Jack A. MandelmanRama DivakaruniCarl Radens
    • H01L27108
    • H01L27/10864H01L27/10867H01L27/10876H01L27/10891H01L29/945
    • A 6F2 memory cell structure comprising a plurality of capacitors each located in a separate trench in a substrate; a pluralaity of transfer transistors each having a vertical gate dielectric, a gate conductor, and a bitline diffusion, each transistor being located above and electrically connected to a respective trench capacitor; a plurality of troughs in a striped pattern about said transistor, said troughs being spaced apart by a substantially uniform spacing, said plurality of striped troughs comprising a first group of troughs consisting of every other one of said troughs being filled with a dielectric material, and a second group of troughs being the remaining troughs of said plurality, said second group of troughs containing dielectric material, damascened wordlines and damascene wordline contacts; a respective wordline electrical contact connected to each respective gate conductor; and a bitline contacted to each bitline diffusion, wherein said bitline diffusions have a width defined by said spacing of said striped troughs and each wordline electrical contact is self-aligned to an edge of a trough of said second group of troughs.
    • 6F2存储器单元结构,包括多个电容器,每个电容器位于衬底中的单独的沟槽中; 每个具有垂直栅极电介质,栅极导体和位线扩散的转移晶体管的多个,每个晶体管位于相应的沟槽电容器的上方并电连接到相应的沟槽电容器; 围绕所述晶体管的条纹图案的多个槽,所述槽以基本上均匀的间隔间隔开,所述多个条纹槽包括由每一个所述槽中的每一个填充有电介质材料构成的第一组槽,以及 第二组槽是所述多个的剩余槽,所述第二组槽包含电介质材料,大阴影字线和大马士革字线触点; 连接到每个相应的栅极导体的相应字线电触头; 并且与每个位线扩散接触的位线,其中所述位线扩散具有由所述条纹槽的所述间隔限定的宽度,并且每个字线电触点与所述第二组槽的槽的边缘自对准。
    • 89. 发明授权
    • Selective reduction of sidewall slope on isolation edge
    • 隔离边缘侧壁倾斜的选择性减小
    • US06228745B1
    • 2001-05-08
    • US09460134
    • 1999-12-13
    • Donald C. WheelerLouis L. HsuJack A. MandelmanRebecca D. Mih
    • Donald C. WheelerLouis L. HsuJack A. MandelmanRebecca D. Mih
    • H01L2176
    • H01L21/76232Y10S438/947
    • Disclosed is a semiconductor structure which comprises a transistor having a source implantation and a drain implantation formed in a semiconductor substrate. The transistor further comprises a gate electrode, a gate oxide, and an active area. The source implantation and drain implantation are situated on opposite sides of said active area, and said gate oxide and gate electrode are situated on top of said active region. The transistor further comprises two trench isolations adjacent to said active area, wherein said trench isolations are situated on opposite sides of said active area such that a sidewall of each trench serves as interface to said active area, at least one of said sidewalls of said trench isolations which serves as interface to said active area being sloped having a slope between 90° and 150°, said trench isolations and source implantation and drain implantation enclosing said active area on four sides.
    • 公开了一种半导体结构,其包括在半导体衬底中形成的源极注入和漏极注入的晶体管。 晶体管还包括栅电极,栅极氧化物和有源区。 源极注入和漏极注入位于所述有源区的相对侧,并且所述栅极氧化物和栅电极位于所述有源区的顶部。 晶体管还包括与所述有源区相邻的两个沟槽隔离,其中所述沟槽隔离位于所述有源区的相对侧,使得每个沟槽的侧壁用作与所述有源区的界面,所述沟槽的至少一个侧壁 用作与所述有源区的界面的隔离具有倾斜的90°至150°之间的斜率,所述沟槽隔离和源极注入和漏极注入在四个侧面上包围所述有源区。