Abstract:
A structure and process for fabricating embedded vertical DRAM cells includes fabricating vertical MOSFET DRAM cells with silicided polysilicon layers in the array regions, the landing pad and/or interconnect structures, the support source and drain regions and/or the gate stack. The process eliminates the need for a M0 metallization layer.
Abstract:
A structure and process for fabricating embedded vertical DRAM cells includes fabricating vertical MOSFET DRAM cells with silicided polysilicon layers in the array regions, the landing pad and/or interconnect structures, the support source and drain regions and/or the gate stack. The process eliminates the need for a M0 metallization layer.
Abstract:
PROBLEM TO BE SOLVED: To reduce the rough surface on a side wall of a trench of a trench capacitor by forming the trench capacitor in the shape of a bottle with the lower part of the treanch being larger than the upper part and covering a collar and an epitaxial buried plate from inside with a node dielectric. SOLUTION: A trench capacitor 310 included in a DRAM cell 300 is formed in a silicon wafer substrate 301. A lower part of a trench has a larger diameter or width WL than the diameter or width WU of an upper part. The trench of such a shape is called a bottle trench. And, an epitaxial silicon (epi) layer 365 covers the lower part of the trench below a collar 368 from inside. The epi is doped with an n-type dopant such as As or P and is used as a buried plate of a capacitor. By covering the lower part of the trench by the epi layer from inside, the rough surface to be formed with a node dielectric can be reduced.
Abstract:
PROBLEM TO BE SOLVED: To provide a trench capacitor, wherein the rough surface of a trench sidewall is suppressed. SOLUTION: In a trench capacitor 301, an epitaxial layer 365 is provided at the lower part of the trench. The epitaxial layer 365 is used as an embedded plate of the trench capacitor. Furthermore, the trench lower part is surrounded by a diffused region 367, which results in higher dopant concentration of the epitaxial layer 365. The diffused region 367 is formed through vapor-phase doping, plasma doping, or plasma infiltration ion implantation.
Abstract:
A DRAM memory cell and process sequence for fabricating a dense (20 or 18 square) layout is fabricated with silicon-on-insulator (SOI) CMOS technology. Specifically, the present invention provides a dense, high-performance SRAM cell replacement that is compatible with existing SOI CMOS technologies. Various gain cell layouts are known in the art. The present invention improves on the state of the art by providing a dense layout that is fabricated with SOI CMOS. In general terms, the memory cell includes a first transistor provided with a gate, a source, and a drain respectively; a second transistor having a first gate, a second gate, a source, and a drain respectively; and a capacitor having a first terminal, wherein the first terminal of said capacitor and the second gate of said second transistor comprise a single entity.
Abstract:
An electrically programmable fuse (eFuse) includes (1) a semiconducting layer above an insulating oxide layer of a substrate; (2) a diode formed in the semiconducting layer; and (3) a silicide layer formed on the diode. The diode comprises an N+,p-,P+ or P+,n-,N+ structure.
Abstract:
PROBLEM TO BE SOLVED: To provide a method for forming an embedded self-aligned strap in a deep storage trench. SOLUTION: A spacer 42/52 is formed on the wall face of a recess on an already filled deep trench capacitor 30. A plug 46/54 is formed within the region between spacers. A photoresist is stuck onto the spacer 42/54 and the plug 46/54 and a peripheral material 40, and a part of the plug 46/54, the spacer 42/52, and the material 40 is exposed. The spacer part not covered with the photoresist is selectively etched. A board and a trench part exposed by the removal of the spacer are selectively etched. An isolation region 58 is formed within the space made etching.
Abstract:
In the present invention, there is disclosed a memory device (200) in a substrate having a trench with side walls in the substrate, said memory device (200) including bit line conductors (246) and word line conductors (230). Signal storage node has a first electrode (202), a second electrode (204) formed within the trench (252; DT), and a node dielectric (206) formed between the electrodes (202, 204). The signal transfer device has: an annular signal transfer region (222) with outer surface adjacent side walls (212) of the trench (252; DT), an inner surface, a first and a second end; a first diffusion region (218) coupling the first end of the signal transfer region (222) to the second electrode (204) of the signal storage node; a second diffusion region (220) coupling the second end of signal transfer region (222) to the bit line conductor (246); a gate insulator (224) coating the inner surface of signal transfer region (222); and a gate conductor (226) coating the gate insulator (224) and coupled to the word line conductor (230). A conductive connecting member (236) couples the signal transfer region (222) to a reference voltage.
Abstract:
Disclosed is a method of simultaneously supplying trench isolations for array and support areas of a semiconductor substrate made of a substrate material, the method comprising providing a first hard mask layer for the array and support areas, said first hard mask comprising mask openings defining trench isolations in the array and support areas, providing deep array trench isolations in the array areas, providing a blanketing planarized conductive material layer over both support and array areas sufficient to fill said mask openings and deep array trench isolations, etching said conductive material through said first hard mask material down into said semiconductor substrate so as to form support trench isolations, such that both deep array trench isolations and support trench isolations are of equal depth, and wherein a conductive element, comprising a quantity of said conductive material, remains in the bottom of each of said deep array trenches.
Abstract:
The present invention provides two-transistor silicon-oxide-nitride-oxide-semiconductor (2-Tr SONOS) non-volatile memory cells with randomly accessible storage locations as well as method of fabricating the same, hi one embodiment, a 2-Tr SONOS cell is provided in which the select transistor is located within a trench structure having trench depth from 1 to 2 µm and the memory transistor is located on a surface of a semiconductor substrate adjoining the trench structure. In another embodiment, a 2-Tr SONOS memory cell is provided in which both the select transistor and the memory transistor are located within a trench structure having the depth mentioned above.