摘要:
A dual charge storage node memory device and methods for its fabrication are provided. In one embodiment a dielectric plug is formed comprising a first portion recessed into a semiconductor substrate and a second portion extending above the substrate. A layer of semiconductor material is formed overlying the second portion. A first layered structure is formed overlying a first side of the second portion of the dielectric plug, and a second layered structure is formed overlying a second side, each of the layered structures overlying the layer of semiconductor material and comprising a charge storage layer between first and second dielectric layers. Ions are implanted into the substrate to form a first bit line and second bit line, and a layer of conductive material is deposited and patterned to form a control gate overlying the dielectric plug and the first and second layered structures.
摘要:
A method for performing shallow trench isolation during semiconductor fabrication that improves trench corner rounding is disclosed. The method includes etching trenches into a silicon substrate between active regions, and performing a double liner oxidation process on the trenches. The method further includes performing a double sacrificial oxidation process on the active regions, wherein corners of the trenches are substantially rounded by the four oxidation processes.
摘要:
A method is disclosed for the definition of the poly-1 layer in a semiconductor wafer. A non-critical mask is used to recess field oxides in the periphery prior to poly-1 deposition by an amount equal to the final poly-1 thickness. A complimentary non-critical mask is used to permit CMP of the core to expose the tops of core oxide mesas from the shallow isolation trenches.
摘要:
A method for forming a memory device is provided. A nitride layer is formed over a substrate. The nitride layer and the substrate are etched to form a trench. The memory device is pre-cleaned to prepare a surface of the memory device for oxide formation thereon, where cleaning the memory device removes portions of the barrier oxide layer on opposite sides of the trench. The nitride layer is trimmed on opposite sides of the trench. A liner oxide layer is formed in the trench.
摘要:
A method of protecting a peripheral region, by forming a protective mask over the peripheral area, during polysilicon polishing while forming self-aligned polysilicon gates in flash memory circuits. In one aspect, the protective mask is formed over a substantial area of the Peripheral region. In another aspect, the protective mask is formed over a substantial area of an active part of the peripheral region.
摘要:
A method for forming a memory device is provided. A nitride layer is formed over a substrate. The nitride layer and the substrate are etched to form a trench. The nitride layer is trimmed on opposite sides of the trench to widen the trench within the nitride layer. The trench is filled with an oxide material. The nitride layer is stripped from the memory device, forming a mesa above the trench.
摘要:
A method for forming a memory device is provided. A nitride layer is formed over a substrate. The nitride layer and the substrate are etched to form a trench. The nitride layer is trimmed on opposite sides of the trench to widen the trench within the nitride layer. The trench is filled with an oxide material. The nitride layer is stripped from the memory device, forming a mesa above the trench.
摘要:
A memory device includes a substrate and a first dielectric layer formed over the substrate. At least two charge storage elements are formed over the first dielectric layer. The substrate and the first dielectric layer include a shallow trench filled with an oxide material. The oxide material formed in a center portion of the shallow trench is removed to provide a region with a substantially rectangular cross-section.
摘要:
A method for repairing an isolation dielectric damaged during a semiconductor fabrication process is disclosed in which a hard mask material is used to pattern a first material, the first material having openings therein exposing isolation regions comprising a first isolation dielectric layer. The method includes etching the hard mask material from the first material, wherein the etch creates gouges in the first isolation dielectric layer, and depositing a second layer of isolation dielectric over the first material, wherein the second isolation dielectric layer fills the gouges in the first isolation dielectric layer. The method further includes polishing on the second layer of isolation dielectric to remove the second layer of isolation dielectric from the first material.
摘要:
A memory device is provided including a substrate. A first dielectric layer is formed over the substrate. An isolation trench is formed in a portion of the substrate and the first dielectric layer. At least two charge storage elements are formed over the first dielectric layer on opposite sides of the isolation trench. A second dielectric layer is formed over the at least two charge storage elements. A control gate layer is formed over the second dielectric layer, where the isolation trench has a width suitable for reducing cross-coupling noise of charge storage elements, and where the at least two charge storage elements have a height suitable for providing sufficient gate coupling between the at least two charge storage elements and the control gate layer.