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    • 54. 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。
    • 57. 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。
    • 60. 发明授权
    • Process of manufacturing a vertical dynamic random access memory device
    • 制造垂直动态随机存取存储器件的过程
    • US06255158B1
    • 2001-07-03
    • US09667652
    • 2000-09-22
    • Toshiharu FurukawaUlrike GrueningDavid V. HorakJack A. MandelmanCarl J. RadensThomas S. Rupp
    • Toshiharu FurukawaUlrike GrueningDavid V. HorakJack A. MandelmanCarl J. RadensThomas S. Rupp
    • H01L218242
    • H01L27/10864H01L27/10876H01L27/10891
    • A dynamic random access memory (DRAM) device. The DRAM device is formed in a substrate having a top surface and a trench with a sidewall formed in the substrate. A signal storage node is formed using a bottom portion of the trench and a signal transfer device is formed using an upper portion of the trench. The signal transfer device includes a first diffusion region coupled to the signal storage node and extending from the sidewall of the trench into the substrate a second diffusion region formed in the substrate adjacent to the top surface of the substrate and adjacent the sidewall of the trench, a channel region extending along the sidewall of the trench between the first diffusion region and the second diffision region, a gate insulator formed along the sidewall of the trench extending from the first diffusion region to the second diffusion region, a gate conductor filling the trench and having a top surface, and a wordline having a bottom adjacent the top surface of the gate conductor and a side aligned with the sidewall of the trench.
    • 动态随机存取存储器(DRAM)设备。 DRAM器件形成在具有顶表面的衬底和具有形成在衬底中的侧壁的沟槽中。 使用沟槽的底部形成信号存储节点,并且使用沟槽的上部形成信号传送装置。 信号传送装置包括耦合到信号存储节点并且从沟槽的侧壁延伸到衬底中的第一扩散区域,形成在衬底中邻近衬底的顶表面并邻近沟槽的侧壁的第二扩散区域, 在所述第一扩散区域和所述第二扩散区域之间沿着所述沟槽的侧壁延伸的沟道区域,沿着从所述第一扩散区域延伸到所述第二扩散区域的所述沟槽的侧壁形成的栅极绝缘体,填充所述沟槽的栅极导体, 具有顶表面,并且字线具有邻近栅极导体的顶表面的底部和与沟槽的侧壁对准的一侧。