Abstract:
A memory cell array (50) comprises a two dimensional array of memory cells (52) fabricated on a semiconductor substrate (54). The memory cells (52) are arranged in a plurality of rows defining a row direction (67) and a plurality columns defining a column direction (69). Each column of memory cells (52) comprising a plurality of alternating channel regions (58) and source/drain regions (64). A conductive interconnect (72) is positioned above each source/drain region (64) and coupled to only one other source/drain region (64). The one other source/drain region (64) is in a second column that is adjacent to the column. The conductive interconnects (64) are positioned such that every other conductive interconnect (64) connects to the adjacent column to a right side of the column and every other conductive interconnect connects to adjacent column to the left side of the column. A plurality of source/drain control lines (70) extends between adjacent columns of memory cells (52) and electrically couple to each conductive interconnect (72) that couples between the adjacent columns.
Abstract:
One aspect of the present invention provides a process for forming IC devices (100) with ESD protection transistors (112). According to one aspect of the invention, an ESD protection transistor (112) is provided with a light doping and then, after forming spacers, a heavy doping. The heavy doping with spacers in place can lower the sheet resistance, enhance the bipolar effect for the transistor, reduce the transistor's capacitance, and reduce the junction breakdown voltage, all without causing short channel effects. The invention thereby provides ESD protection transistors (112) that are compact, highly sensitive, and fast-switching. The spacers can be formed at the same time as spacers for other transistors, such as other transistors in a peripheral region of the device (100).
Abstract:
A memory cell with reduced short channel effects is described. A source region (54) and a drain region (56) are formed in a semiconductor substrate (58). A trench region (59) is formed between the source region and the drain region. A recessed channel region (52) is formed below the trench region, the source region and the drain region. A gate dielectric layer (60) is formed in the trench region of the semiconductor substrate above the recessed channel region and between the source region and the drain region. A control gate layer (70) is formed on the semiconductor substrate above the recessed channel region, wherein the control gate layer is separated from the recessed channel region by the gate dielectric layer.
Abstract:
One aspect of the present invention provides a process for forming IC devices (100) with ESD protection transistors (112). According to one aspect of the invention, an ESD protection transistor (112) is provided with a light doping and then, after forming spacers, a heavy doping. The heavy doping with spacers in place can lower the sheet resistance, enhance the bipolar effect for the transistor, reduce the transistor's capacitance, and reduce the junction breakdown voltage, all without causing short channel effects. The invention thereby provides ESD protection transistors (112) that are compact, highly sensitive, and fast-switching. The spacers can be formed at the same time as spacers for other transistors, such as other transistors in a peripheral region of the device (100).
Abstract:
One aspect of the present invention relates to a method of forming spacers (56) in a SONOS type nonvolatile semiconductor memory device, involving providing a substrate (40) having a core region (42) and periphery region (44), the core region (42) containing SONOS type memory cells (48) and the periphery region (44) containing gate transistors (50); implanting a first implant into the core region (42) and a first implant into the perifery region (44) of the substrate (40); forming a spacer material (52) over the substrate (40); masking the core region (42) and forming spacers (56) adjacent the gate transistors (50) in the perifery region (44); and implanting a second implant into the perifery region (44) of the substrate (40).
Abstract:
A method of forming a contact in a flash memory device utilizes a local interconnect process technique. The local interconnect process technique allows the contact to butt against or overlap a stacked gate associated with the memory cell. The contact can include tungsten. The stacked gate is covered by a barrier layer which also covers the insulative spacers.
Abstract:
A memory cell array (50) comprises a two dimensional array of memory cells (52) fabricated on a semiconductor substrate (54). The memory cells (52) are arranged in a plurality of rows defining a row direction (67) and a plurality columns defining a column direction (69). Each column of memory cells (52) comprising a plurality of alternating channel regions (58) and source/drain regions (64). A conductive interconnect (72) is positioned above each source/drain region (64) and coupled to only one other source/drain region (64). The one other source/drain region (64) is in a second column that is adjacent to the column. The conductive interconnects (64) are positioned such that every other conductive interconnect (64) connects to the adjacent column to a right side of the column and every other conductive interconnect connects to adjacent column to the left side of the column. A plurality of source/drain control lines (70) extends between adjacent columns of memory cells (52) and electrically couple to each conductive interconnect (72) that couples between the adjacent columns.
Abstract:
A memory cell array (50) comprises a two dimensional array of memory cells (52) fabricated on a semiconductor substrate (54). The memory cells (52) are arranged in a plurality of rows defining a row direction (67) and a plurality columns defining a column direction (69). Each column of memory cells (52) comprising a plurality of alternating channel regions (58) and source/drain regions (64). A conductive interconnect (72) is positioned above each source/drain region (64) and coupled to only one other source/drain region (64). The one other source/drain region (64) is in a second column that is adjacent to the column. The conductive interconnects (64) are positioned such that every other conductive interconnect (64) connects to the adjacent column to a right side of the column and every other conductive interconnect connects to adjacent column to the left side of the column. A plurality of source/drain control lines (70) extends between adjacent columns of memory cells (52) and electrically couple to each conductive interconnect (72) that couples between the adjacent columns.