摘要:
Two process flows are disclosed for the stacked etch fabrication of an EPROM array that utilizes cross-point cells with internal access transistors. In each process flow, the edges of the polysilicon 1 floating gates parallel to the polysilicon 2 word line are self-aligned to the word line, eliminating parasitic polysilicon 2 transistors and process requirements for coping with such transistors.
摘要:
A contactless EPROM cell array in accordance with the present invention comprises an N+ source line formed in the silicon substrate. First and second N+ drain lines are formed in parallel with and spaced-apart from the source line on opposite sides of the source line. First and second field oxide strips are formed in parallel with but spaced-apart from the first and second drain lines, respectively, such that the source line/drain line structure is bounded on both sides by the first and second field oxide strips to separate this structure from adjacent similar source/drain line structures. First and second polysilicon 1 lines overlie the channel regions between the first drain line and the source line and the second drain line and the source line, respectively, and are separated therefrom by a first layer of dielectric material. A plurality of spaced-apart, parallel polysilicon 2 word lines overlie and run perpendicular to the first and second polysilicon 1 lines and are spaced-apart therefrom by a second dielectric material. Thus, the EPROM cells of the array are defined at each crossing of the polysilicon 1 lines and the polysilicon 2 word lines.
摘要:
1. Process for the production, on a semiconductor substrate (8), of an integrated circuit having at least two separate electrically insulated components, a first component (2) having a first insulant (10) surmounted by first (12) and second (14) stacked gates, which are separated by a second insulant (16), and a second component (22) having a third insulant (30) surmounted by a third gate (28), the first (10), second (16) and third (30) insulants having different, clearly defined thicknesses, characterized in that it comprises the following stages : a) producing a first insulant layer (110) on the substrate (8), b) covering the first insulant layer (110) with a first conductive layer (112), in which the first gate (12) will be formed, c) formation of a second insulant layer (112) on the first conductive layer (116), d) carrying out a first etching of the second insulant layer (116) and the first conductive layer (112) so as to only retain said second insulant and said conductive material in the region in which the first component will be produced, e) elimination of the first insulant layer (110) region located at the point where the second component will be produced, f) producing a third insulant layer (130) in said location, g) covering the structure obtained with a second conductive layer (114), h) producing the second (14) and third (28) gates by etching the second conductive layer (114) and i) producing the first gate (12) with the aid of a second etching of the second insulant layer (116) and the first conductive layer (112).
摘要:
A method of forming a memory device by forming spaced apart first and second regions with a channel region therebetween, forming a floating gate over and insulated from a first portion of the channel region, forming a control gate over and insulated from the floating gate, forming an erase gate over and insulated from the first region, and forming a select gate over and insulated from a second portion of the channel region. Forming of the floating gate includes forming a first insulation layer on the substrate, forming a first conductive layer on the first insulation layer, and performing two separate etches to form first and second trenches through the first conductive layer. A sidewall of the first conductive layer at the first trench has a negative slope and a sidewall of the first conductive layer at the second trench is vertical.
摘要:
A semiconductor device, comprising: a semiconductor substrate (30); a nonvolatile memory cell (47) including a first MOS transistor having a first gate formed on the semiconductor substrate, the first gate being a layered gate structure having a first gate insulating film (32), a first gate electrode film (33), a second gate insulating film (34), a second gate electrode film (44), and a source and a drain (46) formed in the semiconductor substrate to interpose a surface region of the semiconductor substrate beneath the first gate; and a logic circuit including a plurality of second MOS transistors, each of the second MOS transistors having a second gate formed on the semiconductor substrate, the second gate being a gate structure having a third gate insulating film and a second gate electrode film, and a source and a drain formed in the semiconductor substrate to interpose a surface region of the semiconductor substrate beneath the second gate, the plurality of second MOS transistors including at least a second MOS transistor having a third gate insulating film of a first thickness (38), a second MOS transistor having a third gate insulating film of a second thickness (40) and a second MOS transistor having a third gate insulating film of a third thickness (42); wherein the first thickness is thicker than the second thickness and the second thickness is thicker than the third thickness, and a thickness of the second gate insulating film is thicker than the second thickness and thinner than the first thickness.
摘要:
An oxide-containing layer (18) is formed directly on a semiconductor layer (12) in an NVM region (14), and a first partial layer (20) of a first material is formed over the oxide-containing layer in the NVM region. A first high-K dielectric layer (22) is formed directly on the semiconductor layer in a logic region (16). A first conductive layer (24) is formed over the first dielectric layer in the logic region. A second partial layer (26) of the first material is formed directly on the first partial layer in the NVM region and over the first conductive layer in the logic region. A logic device is formed in the logic region. An NVM cell is formed in the NVM region, wherein the first and second partial layer together are used to form one of a charge storage layer (28) if the cell is a floating gate cell or a select gate (28) if the cell is a split gate cell.
摘要:
On a surface of a Si substrate, a nonvolatile memory cell, an nMOS transistor (101n), and a pMOS transistor (101p) are formed, and thereafter an interlayer insulation film covering the nonvolatile memory cell, the nMOS transistor, and the pMOS transistor is formed. Next, in the interlayer insulation film, there are formed plural contact plugs connected respectively to a control gate (CG) of the nonvolatile memory cell, a source or a drain of the nMOS transistor, and a source or a drain of the pMOS transistor. Thereafter, there is formed a single-layer wiring (M1) connecting the control gate to the sources or drains of the nMOS transistor and the pMOS transistor via the plural contact plugs.
摘要:
An object of the present invention is to provide a nonvolatile semiconductor storage device with a superior charge holding characteristic in which highly-efficient writing is possible at low voltage, and to provide a manufacturing method thereof. The nonvolatile semiconductor storage device includes a semiconductor film having a pair of impurity regions formed apart from each other and a channel formation region provided between the impurity regions; and a first insulating film, a charge accumulating layer, a second insulating film, and a conductive film functioning as a gate electrode layer which are provided over the channel formation region. In the nonvolatile semiconductor storage device, a second barrier formed by the first insulating film against a charge of the charge accumulating layer is higher in energy than a first barrier formed by the first insulating film against a charge of the semiconductor film.