WO2017073394A1 - 不揮発性半導体記憶装置 - Google Patents
不揮発性半導体記憶装置 Download PDFInfo
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- WO2017073394A1 WO2017073394A1 PCT/JP2016/080721 JP2016080721W WO2017073394A1 WO 2017073394 A1 WO2017073394 A1 WO 2017073394A1 JP 2016080721 W JP2016080721 W JP 2016080721W WO 2017073394 A1 WO2017073394 A1 WO 2017073394A1
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- G—PHYSICS
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- G11C16/00—Erasable programmable read-only memories
- G11C16/02—Erasable programmable read-only memories electrically programmable
- G11C16/04—Erasable programmable read-only memories electrically programmable using variable threshold transistors, e.g. FAMOS
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10B—ELECTRONIC MEMORY DEVICES
- H10B41/00—Electrically erasable-and-programmable ROM [EEPROM] devices comprising floating gates
- H10B41/30—Electrically erasable-and-programmable ROM [EEPROM] devices comprising floating gates characterised by the memory core region
- H10B41/35—Electrically erasable-and-programmable ROM [EEPROM] devices comprising floating gates characterised by the memory core region with a cell select transistor, e.g. NAND
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- G—PHYSICS
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- G11C—STATIC STORES
- G11C16/00—Erasable programmable read-only memories
- G11C16/02—Erasable programmable read-only memories electrically programmable
- G11C16/04—Erasable programmable read-only memories electrically programmable using variable threshold transistors, e.g. FAMOS
- G11C16/0408—Erasable programmable read-only memories electrically programmable using variable threshold transistors, e.g. FAMOS comprising cells containing floating gate transistors
- G11C16/0441—Erasable programmable read-only memories electrically programmable using variable threshold transistors, e.g. FAMOS comprising cells containing floating gate transistors comprising cells containing multiple floating gate devices, e.g. separate read-and-write FAMOS transistors with connected floating gates
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
- H01L29/76—Unipolar devices, e.g. field effect transistors
- H01L29/772—Field effect transistors
- H01L29/78—Field effect transistors with field effect produced by an insulated gate
- H01L29/788—Field effect transistors with field effect produced by an insulated gate with floating gate
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
- H01L29/76—Unipolar devices, e.g. field effect transistors
- H01L29/772—Field effect transistors
- H01L29/78—Field effect transistors with field effect produced by an insulated gate
- H01L29/792—Field effect transistors with field effect produced by an insulated gate with charge trapping gate insulator, e.g. MNOS-memory transistors
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10B—ELECTRONIC MEMORY DEVICES
- H10B41/00—Electrically erasable-and-programmable ROM [EEPROM] devices comprising floating gates
- H10B41/40—Electrically erasable-and-programmable ROM [EEPROM] devices comprising floating gates characterised by the peripheral circuit region
- H10B41/41—Electrically erasable-and-programmable ROM [EEPROM] devices comprising floating gates characterised by the peripheral circuit region of a memory region comprising a cell select transistor, e.g. NAND
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10B—ELECTRONIC MEMORY DEVICES
- H10B43/00—EEPROM devices comprising charge-trapping gate insulators
- H10B43/30—EEPROM devices comprising charge-trapping gate insulators characterised by the memory core region
- H10B43/35—EEPROM devices comprising charge-trapping gate insulators characterised by the memory core region with cell select transistors, e.g. NAND
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10B—ELECTRONIC MEMORY DEVICES
- H10B43/00—EEPROM devices comprising charge-trapping gate insulators
- H10B43/40—EEPROM devices comprising charge-trapping gate insulators characterised by the peripheral circuit region
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10B—ELECTRONIC MEMORY DEVICES
- H10B69/00—Erasable-and-programmable ROM [EPROM] devices not provided for in groups H10B41/00 - H10B63/00, e.g. ultraviolet erasable-and-programmable ROM [UVEPROM] devices
Definitions
- the present invention relates to a nonvolatile semiconductor memory device.
- Patent Document 1 discloses a memory cell in which a memory gate structure is disposed between two select gate structures (see Patent Document 1 and FIG. 15). .
- this memory cell includes a drain region to which a bit line is connected and a source region to which a source line is connected, and a selection gate structure, a memory is provided on a well between the drain region and the source region.
- a gate structure and another selection gate structure are arranged and formed in order.
- a charge storage layer is provided in the memory gate structure, and data is written by injecting charges into the charge storage layer, or charges in the charge storage layer are extracted. Thus, data can be erased.
- FIG. 9 is a schematic diagram showing an example of a circuit configuration of a conventional nonvolatile semiconductor memory device 100.
- the nonvolatile semiconductor memory device 100 includes, for example, a plurality of memory cells 102a, 102b, 102c, 102d, 102e, 102f, 102g, and 102h arranged in a matrix, and memory cells 102a and 102b arranged in the row direction.
- Memory cell formation portions 101a, 101b, 101c, and 101d are configured for each of 102c, 102d, 102e, 102f, 102g, and 102h.
- the nonvolatile semiconductor memory device 100 includes memory cells 102a, 102c, 102e, 102g (102b, 102d, 102f, 102h) shares one bit line BL1 (BL2), and a predetermined bit voltage can be applied uniformly to each bit line BL1, BL2. Further, the nonvolatile semiconductor memory device 100 shares, for example, the memory gate lines MGL1, MGL2, MGL3, MGL4 and the drain side select gate lines DGL1, DGL2, DGL3, DGL4 for each of the memory cell forming portions 101a, 101b, 101c, 101d. A predetermined voltage can be applied to each of the memory gate lines MGL1, MGL2, MGL3, MGL4 and each of the drain side select gate lines DGL1, DGL2, DGL3, DGL4.
- one source-side selection gate line SGL and one source line SL are connected to all the memory cells 102a, 102b, 102c, 102d, 102e, 102f, 102g, and 102h.
- a predetermined source gate voltage can be applied to the source side selection gate line SGL, and a predetermined source voltage can be applied to the source line SL.
- Each memory cell 102a, 102b, 102c, 102d, 102e, 102f, 102g, 102h has the same configuration.
- the memory cell 102a includes a memory gate electrode MG connected to the memory gate line MGL1, and a drain side.
- each memory cell 102a, 102b, 102c, 102d, 102e, 102f, 102g, 102h can be injected with charge into the charge storage layer EC by the quantum tunnel effect caused by the voltage difference between the memory gate electrode MG and the channel layer.
- the data can be written.
- a memory cell for reading data (hereinafter also referred to as a data read cell).
- a read voltage of 1.5 [V] is applied to the bit line BL1 connected to 102a, and 0 [V] is read to the bit line BL2 to which only the memory cells 102b, 102d, 102f, and 102h that do not read data are connected.
- a forbidden voltage may be applied.
- 0 [V] is applied to the memory gate lines MGL1, MGL2, MGL3, and MLG4, 1.5 [V] is applied to the source-side selection gate line SGL, and the source line SL 0 [V] may be applied to Further, at this time, in the nonvolatile semiconductor memory device 100, the read gate voltage of 1.5 [V] is applied to the drain side selection gate line DGL1 connected to the data read cell 102a, and the memory cells 102c, 102d, A read inhibit gate voltage of 0 [V] can be applied to the drain side select gate lines DGL2, DGL3, DGL4 to which only 102e, 102f, 102g, 102h are connected.
- the well just below the drain side select gate electrode DG connected to the bit line BL1 is in a conductive state, the charge is stored in the charge storage layer EC (data is written). ), The well just below the memory gate electrode MG becomes non-conductive, the electrical connection between the source line SL and the bit line BL1 is cut off, and the read voltage of 1.5 [V] of the bit line BL1 can be maintained as it is.
- the well just below the memory gate electrode MG becomes conductive, and the data read cell 102a passes through the data read cell 102a.
- the source line SL of 0 [V] is electrically connected to the bit line BL1 of 1.5 [V], and the 1.5 [V] applied to the bit line BL1 is read by the source line SL of 0 [V]. The voltage drops.
- the drain side selection gate is caused by the voltage difference between the drain side selection gate lines DGL2, DGL3, DGL4 and the bit line BL1.
- the well immediately below the electrode DG becomes non-conductive and does not affect the read voltage of 1.5 [V] of the bit line BL1.
- the nonvolatile semiconductor memory device 100 can detect whether or not charges are accumulated in the charge accumulation layer EC of the data read cell 102a by detecting whether or not the read voltage of the bit line BL1 has changed.
- FIG. 10 is a schematic diagram showing an example of a planar layout when the memory cell formation portion 101a is viewed from above the semiconductor substrate.
- the memory cell formation portion 101a provided with three memory cells 102a, 102b, and 102c will be described.
- the memory cell forming portion 101a has a memory cell region ER3 in which the memory cells 102a, 102b, and 102c are arranged, and one selection gate contact region ER6 is provided at one end of the memory cell region ER3. Another select gate contact region ER7 is arranged at the other end of the memory cell region ER3.
- a physical cutting region ER1 (ER5) is disposed at the end of the selection gate contact region ER6 (ER7) via an electric cutting region ER2 (ER4).
- the memory cell formation unit 101a is configured to change from one physical cutting region ER1, one electrical cutting region ER2, one selection gate contact region ER6, memory cell region ER3, another selection gate contact region ER7,
- a strip-shaped memory gate electrode MG extends over the electrical cutting region ER4 and the other physical cutting region ER5.
- the memory gate contact MGC is formed on the memory gate electrode MG in the physical cutting regions ER1 and ER5. Is provided.
- a well W having a predetermined shape is formed on the surface of the semiconductor substrate.
- the memory gate electrode MG intersects the memory placement regions W1, W2, and W3 formed in a strip shape in the well W. Is arranged.
- the memory arrangement regions W1, W2, and W3 are divided into a source region WS side and a drain region WD side with the memory gate electrode MG as a boundary.
- the source regions WS of the memory placement regions W1, W2, and W3 are connected to each other, and the source regions WS are connected via the columnar source contacts SC to which the source lines SL (FIG. 9) are connected.
- a predetermined source voltage can be applied uniformly.
- the drain regions WD of the memory placement regions W1, W2, and W3 are separated from each other, and different bit lines BL1, BL2, and the like via the bit contacts BC provided for the respective drain regions WD.
- a predetermined bit voltage can be individually applied to each drain region WD.
- one side wall 112 of the memory gate electrode MG is disposed on the drain region WD side of the well W, and the drain side selection gate electrode DG is formed along the side wall 112. ing.
- the other side wall 111 of the memory gate electrode MG is disposed on the source region WS side of the well W, and the source side selection gate electrode SG is formed along the side wall 111.
- the drain side selection gate electrode DG and the source side selection gate electrode SG are shared by the plurality of memory cells 102a, 102b, 102c arranged in the row direction together with the memory gate electrode MG.
- the drain side selection gate electrode DG and the source side selection gate electrode SG are insulated from the memory gate electrode MG by side wall spacers (not shown) made of an insulating material.
- a wide selection gate contact forming portion Ca provided with the drain side selection gate contact DGC is formed in one selection gate contact region ER6, and the drain side selection gate line DGL2 (FIG. The predetermined voltage from 9) can be applied via the drain-side selection gate contact DGC and the selection gate contact forming portion Ca.
- a wide selection gate contact forming portion Cb provided with a source side selection gate contact SGC is formed in the other selection gate contact region ER7 in the source side selection gate electrode SG, and the source side selection gate line SGL A predetermined voltage from (FIG. 9) can be applied via the source side select gate contact SGC and the select gate contact forming portion Cb.
- the memory gate electrode MG extends from the memory cell region ER3 in the electrical disconnect regions ER2 and ER4, the drain side selection gate electrode DG and the source side selection gate electrode are different from the memory cell region ER3.
- SG is not extended, and instead of the drain side selection gate electrode DG and the source side selection gate electrode SG, electrical cutting portions 103a and 103b for forming a pin junction are formed.
- the electrically disconnected portions 103a and 103b are of i-type intrinsic semiconductor layers Ia and Ib, and have different conductivity types (in this case, p-type) from the drain-side selection gate electrode DG and the source-side selection gate electrode SG.
- the intrinsic semiconductor layers Ia, Ib and the inverse conductive semiconductor layer OC are arranged in the order of the intrinsic semiconductor layer Ia, the reverse conductivity type semiconductor layer OC, and the intrinsic semiconductor layer Ib. It is formed along each side wall 111, 112 of the gate electrode MG.
- the i-type intrinsic semiconductor layer Ia and the p-type reverse are started from the n-type drain side selection gate electrode DG and the source side selection gate electrode SG. Since the conductive semiconductor layer OC and the i-type intrinsic semiconductor layer Ib are arranged in this order, a pin junction can be formed at the ends of the n-type drain side select gate electrode DG and the source side select gate electrode SG, The drain-side selection gate electrode DG and the source-side selection gate electrode SG can be electrically disconnected at two locations of the target cutting portions 103a and 103b.
- a conductive layer made of a semiconductor material or the like is formed along the side walls 111, 112 and the end wall 113 of the memory gate electrode MG.
- a physical cut portion 104 is formed in which the drain side selection gate electrode DG and the source side selection gate electrode SG are in a non-contact state.
- the drain side select gate electrode DG and the source side select gate The electrode SG is electrically disconnected, and a predetermined voltage can be individually applied to the drain-side selection gate electrode DG and the source-side selection gate electrode SG.
- the electrical connection between the drain side selection gate electrode DG and the source side selection gate electrode SG is performed by the two electrical disconnection portions 103a and 103b and the one physical disconnection portion 104.
- the electrical disconnection portions 103a and 103b and the physical disconnection portion 104 are defective, and the drain side selection gate electrode DG and the source side selection gate electrode SG are electrically connected. It is also possible to be connected.
- the drain side select gate electrode DG and the source side select in the memory cell formation portion 101b that does not read data
- the memory cell forming portion 101b has a 0 [V] drain side select gate line DGL2 and a 1.5 [V] source side select gate line SGL. Will be electrically connected (indicated by wiring L in FIG. 9).
- the voltage of 0 [V] of the drain side selection gate line DGL2 increases, or the source side selection shared by all the memory cells 102a, 102b,.
- the voltage of 1.5 [V] of the gate line SGL is lowered, and a read malfunction may occur due to voltage fluctuations of the drain side selection gate line DGL2 and the source side selection gate line SGL.
- an object of the present invention is to propose a nonvolatile semiconductor memory device capable of preventing a read malfunction caused by voltage fluctuation during a data read operation as compared with the conventional one.
- the nonvolatile semiconductor memory device is a nonvolatile semiconductor memory device provided with a plurality of memory cell formation portions, and the memory cell formation portions are formed on the wells of the semiconductor substrate.
- a first selection gate structure having a first selection gate electrode through a first selection gate insulating film
- a second selection gate structure having a second selection gate electrode on the well through a second selection gate insulating film
- the non-volatile semiconductor memory device is a non-volatile semiconductor memory device provided with a plurality of memory cell forming portions, wherein the memory cell forming portion has a first selection gate insulation on a well of a semiconductor substrate.
- a first select gate structure having a first select gate electrode through a film; a second select gate structure having a second select gate electrode on the well through a second select gate insulating film; and Provided via a sidewall spacer between the first select gate structure and the second select gate structure, and a lower gate insulating film, a charge storage layer, an upper gate insulating film, and a memory gate electrode are stacked on the well in this order.
- the memory cell formation portion and the other memory cell formation portion are arranged such that the first selection gate structure and the second selection gate structure are opposed to each other.
- Selected game The extended electrode portion extended from the memory gate electrode in the formation region has a configuration, and on the side wall of the extended electrode portion, the first selection gate electrode and the second selection gate electrode Three or more reverse conductivity type semiconductor layers or intrinsic semiconductor layers having different conductivity types are provided.
- At least three of the reverse conductivity type semiconductor layer or the intrinsic semiconductor layer capable of cutting the first selection gate electrode and the second selection gate electrode are extended. It is provided along the side wall of the electrode part, and the number of locations where the first selection gate electrode and the second selection gate electrode are cut is increased compared to the conventional one. obtain.
- the first selection gate electrode of one memory cell formation portion and the first selection gate electrode or the second selection gate electrode in another memory cell formation portion Three or more reverse conductivity type semiconductor layers or intrinsic semiconductor layers for cutting electrical connection are provided along the side wall of the extended electrode portion, and the first selection gate electrode of one memory cell forming portion, It is possible to increase the number of locations where the first selection gate electrode or the second selection gate electrode is disconnected in other memory cell formation portions as compared with the conventional case, and accordingly, it is possible to prevent a read malfunction caused by voltage fluctuation during the data read operation.
- FIG. 1 is a schematic diagram showing a planar layout of a nonvolatile semiconductor memory device according to a first embodiment.
- FIG. FIG. 6 is a schematic diagram showing a planar layout of a nonvolatile semiconductor memory device according to a second embodiment.
- FIG. 6 is a schematic diagram showing a planar layout of a nonvolatile semiconductor memory device according to a third embodiment.
- FIG. 1 is a schematic diagram showing a planar layout of a nonvolatile semiconductor memory device according to a first embodiment.
- FIG. FIG. 6 is a schematic diagram showing a planar layout of a nonvolatile semiconductor memory device according to a second embodiment.
- FIG. 6 is a schematic diagram showing a planar layout of a nonvolatile semiconductor memory device according to a third embodiment.
- FIG. 6 is a schematic diagram showing a planar layout of a nonvolatile semiconductor memory device according to a fourth embodiment. It is the schematic which shows the planar layout of the non-volatile semiconductor memory device by other embodiment. It is the schematic which shows the circuit structure of the conventional non-volatile semiconductor memory device. It is the schematic which shows the planar layout of the conventional memory cell formation part.
- a memory cell 2a includes a memory gate structure 4a that forms an N-type transistor structure on a well W made of, for example, P-type Si, and an N-type MOS (Metal-Oxide-Semiconductor).
- a drain side select gate structure 5a that forms a transistor structure and a source side select gate structure 6a that also forms an N-type MOS transistor structure are formed.
- a drain region WD at one end of the drain side select gate structure 5a and a source region WS at one end of the source side select gate structure 6a are formed with a predetermined distance therebetween.
- Bit line BL1 is connected to region WD
- source line SL is connected to source region WS.
- the low-concentration drain region WDa is formed adjacent to the drain region WD
- the sidewall SW formed along the side wall of the drain-side selection gate structure 5a includes the low-concentration drain region WDa. Arranged on drain region WDa.
- the low-concentration source region WSa is formed adjacent to the source region WS on the surface of the well W, and the sidewall SW formed along the side wall of the source-side selection gate structure 6a includes the low-concentration source region WSa. Arranged on the source area WSa.
- the memory gate structure 4a includes, for example, silicon nitride (Si 3 N 4) on the well W between the low-concentration drain region WDa and the low-concentration source region WSa via a lower gate insulating film Bo made of an insulating material such as SiO 2. ), Silicon oxynitride (SiON), alumina (Al 2 O 3 ), hafnia (HfO2), etc., and the charge storage layer EC is also made of an insulating material.
- a memory gate electrode MG is provided via the upper gate insulating film Tp.
- the memory gate structure 4a has a configuration in which the charge storage layer EC is insulated from the well W and the memory gate electrode MG by the lower gate insulating film Bo and the upper gate insulating film Tp.
- the memory gate structure 4a has a cap film CP formed of an insulating material formed on the memory gate electrode MG, and the silicide layer S1 on the upper surface of the drain side selection gate structure 5a.
- the silicide layer S2 on the upper surface of the source side select gate structure 6a is formed so as to be away from the upper surface of the memory gate electrode MG by the thickness of the cap film CP.
- the memory gate electrode MG in the region of the memory cell 2a has a structure in which no silicide layer is formed on the upper surface and is covered with the cap film CP.
- the cap film CP is formed on the lower cap film CPa made of an insulating material such as SiO 2 and the upper cap film CPb made of an insulating material such as SiN different from the lower cap film CPa. It has a laminated structure.
- the memory gate electrode MG of the memory gate structure 4a is provided with a wall-shaped first side wall 11 and a wall-shaped second side wall 12 arranged to face the first side wall 11.
- each side wall of the lower gate insulating film Bo, the charge storage layer EC, the upper gate insulating film Tp, and the cap film CP extends along the first side wall 11 and the second side wall 12 of the memory gate electrode MG.
- the lower gate insulating film Bo, the charge storage layer EC, the upper gate insulating film Tp, and the cap film CP are formed in a region between the first sidewall 11 and the second sidewall 12 of the memory gate electrode MG.
- the memory gate structure 4a is made of an insulating material along the second sidewall 12 of the memory gate electrode MG and the sidewalls of the lower gate insulating film Bo, the charge storage layer EC, the upper gate insulating film Tp, and the cap film CP.
- a side wall spacer 28a is formed, and the drain side select gate structure 5a is adjacent to the side wall spacer 28a.
- the sidewall spacer 28a formed between the memory gate structure 4a and the drain side selection gate structure 5a is formed with a predetermined film thickness, and the memory gate structure 4a, the drain side selection gate structure 5a, Can be insulated.
- the film thickness of the side wall spacer 28a between the memory gate structure 4a and the drain side select gate structure 5a depends on the breakdown voltage of the side wall spacer 28a and the reading between the memory gate structure 4a and the drain side select gate structure 5a. In consideration of the current, it is desirable to select a width of 5 [nm] or more and 40 [nm] or less.
- the drain side select gate structure 5a is formed on the well W between the side wall spacer 28a and the drain region WD with a film thickness of 9 [nm] or less, preferably 3 [nm] or less and made of an insulating material. 30, and a drain side select gate electrode DG is formed on the drain side select gate insulating film 30.
- a silicide layer S1 is formed on the top surface of the drain side selection gate electrode DG as the second selection gate electrode, and the drain side selection gate line DGL1 as the second selection gate line is connected to the silicide layer S1. ing.
- the memory gate structure 4a is insulated along the first sidewall 11 of the memory gate electrode MG and the sidewalls of the lower gate insulating film Bo, the charge storage layer EC, the upper gate insulating film Tp, and the cap film CP.
- a side wall spacer 28b made of a material is formed, and the source side select gate structure 6a is adjacent to the side wall spacer 28b.
- the sidewall spacer 28b formed between the memory gate structure 4a and the source-side selection gate structure 6a also has the same film thickness as 5 nm or more and 40 nm or less as one sidewall spacer 28a.
- the memory gate structure 4a and the source-side selection gate structure 6a can be insulated from each other.
- the source side select gate structure 6a has a source side select gate insulating film made of an insulating material with a film thickness of 9 [nm] or less, preferably 3 [nm] or less, on the well W between the sidewall spacer 28b and the source region WS.
- the source-side selection gate electrode SG is formed on the source-side selection gate insulating film 33.
- a silicide layer S2 is formed on the upper surface of the source side selection gate electrode SG as the first selection gate electrode, and the source side selection gate line SGL as the first selection gate line is connected to the silicide layer S2. ing.
- the source side selection gate electrode SG and the drain side selection formed along the first side wall 11 and the second side wall 12 of the memory gate electrode MG via the side wall spacers 28a and 28b.
- Each of the gate electrodes DG is formed in a sidewall shape such that the top portion descends toward the well W as the distance from the memory gate electrode MG increases.
- the source side select gate structure 6a and the drain side select gate structure 5a are formed in a sidewall shape along the side walls (first side wall 11 and second side wall 12) of the memory gate structure 4a, respectively. Even if the source side selection gate structure 6a and the drain side selection gate structure 5a are close to the memory gate structure 4a, the drain side selection gate electrode DG is formed by the cap film CP formed on the memory gate electrode MG. Since the silicide layer S1 on the upper side and the silicide layer S2 on the source-side selection gate electrode SG are separated from the memory gate electrode MG, the silicide layers S1 and S2 and the memory gate electrode MG are short-circuited accordingly. It has been made to be able to prevent.
- FIG. 2 In the nonvolatile semiconductor memory device 1, for example, a plurality of memory cells 2a, 2b, 2d, 2e, 2g, 2h, 2i, and 2j are arranged in a matrix. Each memory cell 2b, 2d, 2e, 2g, 2h, 2i, 2j has the same configuration as the memory cell 2a described in FIG. 1, and the memory gate electrode MG to which the memory gate line MGL is connected. And a drain side selection gate electrode DG to which the drain side selection gate line DGL1 (DGL2, DGL3, DGL4) is connected, and a source side selection gate electrode SG to which the source side selection gate line SGL is connected.
- DGL1 drain side selection gate line
- DGL3 DGL3, DGL4
- the nonvolatile semiconductor memory device 1 includes memory cell forming portions 3a, 3b, 3c, 3d for each of the memory cells 2a, 2b, 2d, 2e, 2g, 2h, 2i, 2j arranged in the row direction, for example, a substrate A predetermined substrate voltage can be applied to the memory cells 2a, 2b, 2d, 2e by the voltage line Back.
- the nonvolatile semiconductor memory device 1 includes memory cells 2a, 2d, 2g, 2i (2b, 2e, 2h, 2h, 2i, 2i) arranged in the column direction among the memory cells 2a, 2b, 2d, 2e, 2g, 2h, 2i, 2j. 2j) share one bit line BL1 (BL2), and each bit line BL1, BL2 provides a predetermined value for each memory cell 2a, 2d, 2g, 2i, 2b, 2e, 2h, 2j in the column direction.
- a bit voltage can be applied uniformly.
- the nonvolatile semiconductor memory device 1 shares the drain side select gate lines DGL1, DGL2, DGL3, DGL4 for each of the memory cell forming portions 3a, 3b, 3c, 3d, for example, and each drain side select gate line DGL1 , DGL2, DGL3, and DGL4 can apply a predetermined voltage to each of the memory cell forming portions 3a, 3b, 3c, and 3d.
- all memory cells 2a, 2b, 2d, 2e are connected to one memory gate line MGL, one source-side selection gate line SGL, and one source line SL.
- a predetermined memory gate voltage is applied to the memory gate line MGL
- a predetermined source gate voltage is applied to the source-side selection gate line SGL
- a predetermined value is applied to the source line SL.
- a source voltage may be applied.
- FIG. 3 shows, for example, a data write operation (“Prog”) in which charge is injected into the charge storage layer EC of the memory cell 2a in the nonvolatile semiconductor memory device 1 shown in FIG. 2, and the charge storage layer EC of the memory cell 2a.
- Read data read operation
- Erase time of data erase operation
- the voltage value (“selected column” and “selected row”) when the charge is injected into the charge storage layer EC of the memory cell 2 a and the charge in the charge storage layer EC of the memory cell 2 a Indicates a voltage value ("non-selected column” or "non-selected row”) when no.
- a 12 [V] charge storage gate is connected from the memory gate line MGL to the memory gate electrode MG.
- a voltage is applied, and a substrate voltage of 0 [V] can be applied to the well W (denoted as “Back” in FIG. 3).
- a gate-off voltage of 0 [V] from the source-side selection gate line SGL is applied to the source-side selection gate electrode SG, and a source-off voltage of 0 [V] from the source line SL to the source region WS. Can be applied.
- the source-side selection gate structure 6a cuts off the electrical connection between the source region WS and the channel layer formation carrier region of the memory gate structure 4a, and forms the channel layer of the memory gate structure 4a from the source line SL. Application of voltage to the carrier region can be prevented.
- drain-side selection gate voltage of 1.5 [V] from the drain-side selection gate line DGL1 is applied to the drain-side selection gate electrode DG, and a charge storage bit of 0 [V] from the bit line BL1 is applied to the drain region WD.
- a voltage can be applied.
- the drain side select gate structure 5a can electrically connect the drain region WD and the channel layer forming carrier region of the memory gate structure 4a.
- the channel layer forming carrier region when the channel layer forming carrier region is electrically connected to the drain region WD, carriers are induced in the channel layer forming carrier region, and the channel layer having the same 0 [V] as the charge storage bit voltage Can be formed on the surface of the well W by the carrier.
- a large voltage difference (12 [V]) of 12 [V] is generated between the memory gate electrode MG and the channel layer, and the charge is generated in the charge storage layer EC by the quantum tunnel effect generated thereby. It can be injected and data can be written.
- the memory cell 2a injects charges into the charge storage layer EC.
- the source-side selection gate structure 6a cuts off the electrical connection between the well W in the region facing the memory gate electrode MG and the source region WS, and the drain-side selection gate structure 5a The electrical connection between the well W in the region facing the memory gate electrode MG and the drain region WD is cut off.
- the bit line BL1 connected to the memory cell 2a to be read is precharged to 1.5 [V], for example, and the source line SL is set to 0.
- the potential of the bit line BL1 that changes depending on whether or not a current flows through the memory cell 2a at [V] it can be determined whether or not charges are accumulated in the charge accumulation layer EC of the memory cell 2a. .
- the data read operation of whether or not charges are accumulated in the charge accumulation layer EC of the memory cell 2a by detecting whether or not the read voltage of the bit line BL1 has changed. Can be executed. Note that a non-read voltage of 0 [V] can be applied to the bit line BL2 to which only the memory cells 2b, 2e, 2h, and 2j from which data is not read are connected.
- a memory of -12 [V] is transferred from the memory gate line MGL to the memory gate electrode MG.
- the gate voltage By applying the gate voltage, the charges in the charge storage layer EC are extracted toward the well W of 0 [V], and data can be erased.
- FIG. 4 is a schematic diagram showing a planar layout of the nonvolatile semiconductor memory device 1 of the present invention in which a plurality of memory cell forming portions 3a, 3b, 3c,... Are arranged on a semiconductor substrate, as viewed from above the semiconductor substrate. is there. Since the memory cell forming portions 3a, 3b, 3c,... All have the same configuration, the following description will be focused on one memory cell forming portion 3a.
- FIG. 1 showing a cross-sectional configuration of the memory cell 2a shows a cross-sectional configuration in the AA ′ portion of FIG.
- FIG. 4 in addition to the side wall spacers 28a and 28b formed on the side wall of the memory gate structure 4a shown in FIG. 1, the drain side selection gate structure 5a and the source side selection gate structure 6a are formed.
- the side walls SW, silicide layers S1, S2 and the like are not shown.
- the memory cell forming portions 3a, 3b, 3c,... Are extended in one direction (row direction in FIG. 4), and are arranged in parallel at a predetermined distance. Is placed on top.
- the memory cell formation portion 3a has a selection gate formation region ER9 in which the source side selection gate electrode SG and the drain side selection gate electrode DG are arranged to face each other with the memory gate electrode MG interposed therebetween.
- the select gate formation region ER9 is provided at a memory cell region ER3 in which a plurality of memory cells 2a, 2b, 2c are formed along the longitudinal direction of the memory cell formation portion 3a, and at one end of the memory cell region ER3.
- One select gate contact region ER6 and another select gate contact region ER7 provided at the other end of the memory cell region ER3.
- a plurality of memory cells 2d, 2e, 2f (2g, 2h, 2i) are formed in the memory cell region ER3 along the longitudinal direction.
- the memory cell formation portion 3a (3b, 3c) shown in FIG. 2 only the memory cells 2a, 2b (2d, 2e, 2g, 2h) are shown, but in FIG.
- the memory cells 2c (2f, 2i) in the third column adjacent to 2e, 2h) are also illustrated.
- a memory gate electrode MG extending in one direction in the select gate formation region ER9 is formed in the memory cell formation portion 3a.
- the memory gate electrode MG in the selection gate formation region ER9 has a first side wall extending over the selection gate formation region ER9, and a second side wall 12 disposed to face the first side wall.
- a source side select gate electrode SG is disposed along the side wall 11, and a drain side select gate electrode DG is disposed along the second side wall 12.
- a well W having a predetermined shape is formed on the surface of the semiconductor substrate.
- the memory cell forming portion 3a are arranged to intersect.
- a memory cell 2a (2b, 2c) having a memory gate structure 4a, a drain side selection gate structure 5a, and a source side selection gate structure 6a Is formed on the memory arrangement area W1 (W2, W3).
- the memory arrangement regions W1, W2, and W3 of the well W are divided into a source region WS side and a drain region WD side with the memory gate structure 4a as a boundary.
- the drain regions WD between the memory cell formation portions 3a and 3b are separated from each other, and have a configuration in which columnar bit contacts BC are individually provided.
- Each bit contact BC is connected to a different bit line BL1, BL2,... (FIG. 2), and a predetermined bit voltage can be individually applied from the corresponding bit line BL1, BL2,.
- a predetermined bit voltage can be applied to each drain region WD of the memory cell forming portion 3a from the different bit lines BL1, BL2,.
- the drain region WD is shared by the other memory cell forming portion 3b adjacent to the one memory cell forming portion 3a, so that the memory cell 2a of the one memory cell forming portion 3a is shared.
- the same bit voltage as (2b, 2c) can be applied to the memory cells 2d (2e, 2f) of the other memory cell forming section 3b.
- the source regions WS of the memory arrangement regions W1, W2, and W3 are connected to each other and share a columnar source contact SC provided at a predetermined position.
- the source contact SC has a configuration in which the source line SL (FIG. 2) is connected, and a predetermined source voltage applied from the source line SL is applied to the source region WS of each memory placement region W1, W2, W3. It can be applied uniformly.
- the first side wall 11 of the memory gate electrode MG is disposed on the source region WS side of the well W, and along the first side wall 11 of the memory gate electrode MG.
- a source side select gate structure 6a is formed.
- the second side wall 12 of the memory gate electrode MG is disposed on the drain region WD side of the well W, and the drain side selection gate structure along the second side wall 12 of the memory gate electrode MG.
- a body 5a is formed.
- a source side select gate electrode SG formed in a side wall shape is formed along the first side wall 11 in the memory gate structure 4a, and the source side select gate electrode A wide selection gate contact forming portion Ca formed integrally with SG is formed in one selection gate contact region ER7.
- the selection gate contact forming portion Ca includes a rising portion that rides on the memory gate electrode MG and a flat portion that has a flat surface along the semiconductor substrate.
- a columnar source-side selection gate contact SGC to which a line (not shown) is connected is provided in the plane portion.
- a predetermined voltage from the source-side selection gate line SGL is applied via the source-side selection gate contact SGC and the selection gate contact forming portion Ca even in the sidewall-like source-side selection gate electrode SG having a narrow and inclined width. obtain.
- drain side select gate structure 5a is formed with a drain side select gate electrode DG formed in a sidewall shape along the second side wall 12 of the memory gate structure 4a, and the drain A wide selection gate contact forming portion Cb integrally formed with the side selection gate electrode DG is formed in the other selection gate contact region ER6.
- the select gate contact forming portion Cb also includes a rising portion that rides on the memory gate electrode MG and a flat portion that has a flat surface formed along the semiconductor substrate.
- the drain-side select gate line DGL1 A columnar drain-side selection gate contact DGC connected to each other is provided on the plane portion. As a result, a predetermined voltage from the drain-side selection gate line DGL1 is applied via the drain-side selection gate contact DGC and the selection gate contact forming portion Cb even in the sidewall-like drain-side selection gate electrode DG having a narrow and inclined width. obtain.
- the selection gate contact formation portions Ca and Cb provided in the selection gate contact regions ER7 and ER6 are connected to the source side selection gate electrode SG or the drain side selection gate electrode DG, and the source side selection gate contact SGC or As long as the drain-side selection gate contact DGC can be formed, various other shapes may be used. Alternatively, the drain-side selection gate contact DGC may be formed at one or both of various positions within the selection gate contact regions ER7 and ER6.
- an electrical disconnection region ER2 (ER4) is disposed at the end of the select gate contact region ER6 (ER7), and the electrical disconnection region ER2 (ER4) has a physical end.
- Cutting region ER1 (ER5) is arranged.
- the electrical cutting region ER2 (ER4) and the physical cutting region ER1 (ER5) are provided with extended electrode portions 15a (15b) formed by extending the memory gate electrode MG from the selection gate forming region ER9 as it is. ing.
- the extended electrode portion 15a (15b) is formed in a U shape when viewed from above the semiconductor substrate, and the electrical cutting region ER2 (ER4) is formed from the end of the selection gate formation region ER9. Via, it extends to the physical cutting area ER1 (ER5), is folded back at the physical cutting area ER1 (ER5), and extends again to the electric cutting area ER2 (ER4).
- the extended electrode portion 15a (15b) includes an extension portion 16a that extends linearly from the memory gate electrode MG in the selection gate formation region ER9, and a linear end formed at a laterally outward position of the extension portion 16a.
- the extended part 16a and the end part 16b are arranged in the electrical cutting region ER2, and are connected parts that serve as folded portions.
- (Side wall non-forming portion) 16c is arranged in the physical cutting region ER1.
- one extended electrode portion 15a is folded back to the first side wall 11 side of the memory gate electrode MG, and the end portion 16b is arranged on the first side wall 11 side,
- the other extended electrode portion 15b is folded back to the second side wall 12 side of the memory gate electrode MG, and the end portion 16b is disposed on the second side wall 12 side.
- the memory gate electrode MG extends from the selection gate formation region ER9 as the extended electrode portion 15a (15b), but unlike the selection gate formation region ER9, the source side selection gate
- the electrode SG and the drain side selection gate electrode DG are not extended, and instead of the source side selection gate electrode SG and the drain side selection gate electrode DG, four electrical electrodes are provided on the side wall of the extension electrode portion 15a (15b). Cut portions 13a, 13b, 13c, and 13d (13e, 13f, 13g, and 13h) are formed.
- these electrical cutting portions 13a, 13b, 13c, and 13d (13e, 13f, 13g, and 13h) all have the same configuration, i-type sidewall-like intrinsic semiconductor layers Ia, Ib, and
- the reverse-conductivity-type semiconductor layer OC has a sidewall shape, and the reverse-conductivity-type semiconductor layer OC is formed between the intrinsic semiconductor layers Ia and Ib.
- the reverse conductivity type semiconductor layer OC is formed of a conductivity type (in this case, p-type) different from that of the source side select gate electrode SG and the drain side select gate electrode DG.
- one electrical cut portion 13a is formed along one side wall that is continuous with the first side wall 11 of the memory gate electrode MG, and the memory gate electrode Another electrical cutting portion 13c is formed along the other side wall that is continuous with the second side wall 12 of the MG.
- an electrical disconnection portion 13a forms a pin junction from the first side wall 11 of the memory gate electrode MG along the side wall of the extension portion 16a, starting from the n-type source-side selection gate electrode SG. Can do.
- the second side wall 12 side of the memory gate electrode MG is also separated from the second side wall 12 starting from the n-type drain side selection gate electrode DG by, for example, the electrical disconnection portion 13c.
- a pin junction can be formed along the side wall of the extension 16a.
- the extended electrode portion 15a has a drain formed along the second side wall 12 of the memory gate electrode MG from the source side select gate electrode SG formed along the first side wall 11 of the memory gate electrode MG.
- Four electrical cut portions 13a, 13b, 13d, and 13c can be formed in this order on the side wall between the side select gate electrode DG.
- three or more reverse conductivity type semiconductor layers and intrinsic semiconductor layers are provided on the side wall of the extended electrode portion 15a.
- the continuous portion 16c as the side wall non-forming portion in the physical cutting region ER1 includes an outer peripheral wall and an inner peripheral wall connecting the side wall of the extension portion 16a and the side wall of the end portion 16b.
- Physical cutting portions 14a and 14b are formed. These physical cutting portions 14a and 14b are not provided with a conductive layer such as a semiconductor material along the outer peripheral wall and inner peripheral wall of the continuous portion 16c, and expose the outer peripheral wall and inner peripheral wall of the continuous portion 16c to the outside. Have a configuration.
- the physical cut portions 14a and 14b form a physical cut by providing a gap between the source side select gate electrode SG and the drain side select gate electrode DG, and the source side select gate electrode SG and the drain side
- the selection gate electrode DG can be turned off.
- the one physical cutting portion 14a is formed along the outer peripheral wall of the connecting portion 16c, and the electrical cutting portion 13c formed on one side wall of the extension portion 16a.
- a gap is formed between the end portion 16b and the electrical cut portion 13d formed on one side wall, and the electrical cut portions 13c and 13d are in a non-conductive state.
- the other physical cutting part 14b is formed along the inner peripheral wall of the connecting part 16c, the electrical cutting part 13a formed on the other side wall of the extension part 16a, and the other end part 16b.
- a gap is formed between the electrical cutting portion 13b formed on the side wall, and the electrical cutting portions 13a and 13b are in a non-conductive state.
- the extended electrode portion 15a is formed along the second side wall 12 of the memory gate electrode MG from the source-side selection gate electrode SG formed along the first side wall 11 of the memory gate electrode MG.
- an electrical cutting part 13a, a physical cutting part 14b, an electrical cutting part 13b, 13d, a physical cutting part 14a, and an electrical cutting part 13c are arranged in this order. Can be done.
- the extended electrode portion 15a includes the four electrical cut portions 13a, 13b, 13d, and 13c and the two physical cut portions 14a and 14b, thereby providing a source side select gate electrode SG and a drain side select gate electrode DG. Can be prevented from becoming conductive.
- the other extended electrode portion 15b disposed at the other end of the memory cell forming portion 3a is similarly connected to the extended portion 16a so as to be flush with the first side wall 11 of the memory gate electrode MG.
- One electrical cutting part 13e is formed along the side wall
- another electrical cutting part 13g is formed along the other side wall that is provided flush with the second side wall 12 of the memory gate electrode MG.
- one electrical cutting portion 13h is formed on the side wall facing the extension portion 16a
- the other electrical cutting portion 13f is formed on the side wall disposed on the outside. Is formed.
- the extended electrode portion 15b has a drain formed along the second side wall 12 of the memory gate electrode MG from the source side select gate electrode SG formed along the first side wall 11 of the memory gate electrode MG.
- Four electrical cut portions 13e, 13f, 13h, and 13g can be formed in this order on the side wall between the side select gate electrode DG.
- the connecting portion 16c in the other physical cutting region ER5 also has a physical cutting portion 14c on the outer peripheral wall and the inner peripheral wall connecting the side wall of the extension portion 16a and the side wall of the end portion 16b. 14d are formed. These physical cutting portions 14c and 14d also expose the outer peripheral wall and inner peripheral wall of the continuous portion 16c to the outside without providing a conductive layer such as a semiconductor material along the outer peripheral wall and inner peripheral wall of the continuous portion 16c.
- the physical cut portions 14c and 14d form a physical cut by providing a gap between the source side select gate electrode SG and the drain side select gate electrode DG, and the source side select gate electrode SG and the drain side
- the selection gate electrode DG can be turned off.
- one physical cutting portion 14c is formed along the outer peripheral wall of the connecting portion 16c, and an electrical cutting portion 13e formed on one side wall of the extension portion 16a.
- the electrically disconnected portion 13f formed on one side wall of the end portion 16b is in a non-conducting state.
- the other physical cutting part 14d is formed along the inner peripheral wall of the connecting part 16c, the electrical cutting part 13g formed on the other side wall of the extension part 16a, and the other end part 16b.
- the electrical cutting part 13h formed on the side wall is in a non-conductive state.
- the one extended electrode portion 15a and the other extended electrode portion 15b provided on the target also have the memory from the source side select gate electrode SG formed along the first side wall 11 of the memory gate electrode MG.
- an electrical cutting part 13e, a physical cutting part 14c, an electrical cutting part 13f, 13h, a physical The cutting part 14d and the electrical cutting part 13g are arranged in this order.
- the source-side selection gate electrode SG and the drain-side selection gate electrode are constituted by the four electrical disconnect portions 13e, 13f, 13h, and 13g and the two physical disconnect portions 14c and 14d. It is possible to prevent DG from becoming conductive.
- the drain side select gate electrode DG Is disposed opposite to the second side wall 12 of the memory gate electrode MG in the one memory cell formation portion 3a.
- the memory cell forming portion 3b has an extended electrode portion 15c in which an end portion 16b is disposed on the side of the adjacent one memory cell forming portion 3a in one electrical cutting region ER2 and physical cutting region ER1.
- the other electrical cutting region ER4 and the physical cutting region ER5 have the extended electrode portion 15d in which the end portion 16b is disposed on the other adjacent memory cell forming portion 3c side.
- the memory cell formation portion in the second row is placed in one of the electrical disconnection region ER2 and the physical disconnection region ER1 between the memory cell formation portion 3a in the first row and the memory cell formation portion 3b in the second column.
- the end 16b of the extended electrode portion 15c in 3b and the continuous portion 16c are disposed, and the extended electrode portion 15b in the memory cell forming portion 3a of the first row is disposed in the other electrical cutting region ER4 and physical cutting region ER5.
- the end portion 16b and the connecting portion 16c may be disposed.
- the end portion 16b of one memory cell formation portion 3a and the end portion 16b of the other memory cell formation portion 3b are provided between the adjacent memory cell formation portions 3a and 3b. It is arranged side by side in the row direction, and it is possible to reduce the size and increase the density by avoiding the spread due to the two end portions 16b being continuously arranged in the column direction between the adjacent memory cell forming portions 3a and 3b. Yes.
- the memory cell formation portion 3a is formed on the memory gate electrode MG in the selection gate formation region ER9 and on the extension portions 16a and ends of the electrical disconnect regions ER2 and ER4 formed by extending the memory gate electrode MG.
- a cap film CP is formed on each portion 16b.
- the cap film CP is not formed on the continuous portion 16c formed by extending the memory gate electrode MG, and the continuous portion 16c is exposed to the outside. Therefore, the upper surface is salicided, and the columnar memory gate contact MGC is provided via a silicide layer (not shown) formed on the continuous portion 16c.
- a memory gate line MGL (FIG. 2) is connected to the memory gate contact MGC, and a predetermined voltage can be applied from the memory gate line MGL. Thereby, the voltage of the memory gate line MGL can be applied to the memory gate electrode MG in the select gate formation region ER9 from the memory gate contact MGC via the extended electrode portions 15a and 15b.
- the memory gate electrode MG is covered with the cap film CP in the memory cell region ER3 and the select gate contact regions ER6 and ER7, the physical cutting regions ER1 and ER5
- a predetermined voltage is also applied to the memory gate electrode MG covered with the cap film CP in the memory cell region ER3.
- such a nonvolatile semiconductor memory device 1 includes a film forming process, a resist coating process, an exposure development process, an etching process, an impurity implantation process, a resist stripping process, etc., which are general CMOS (Complementary MOS) manufacturing processes. Therefore, the manufacturing method is omitted here.
- CMOS Complementary MOS
- the memory gate electrode MG in the selection gate formation region ER9 in which the source side selection gate structure 6a and the drain side selection gate structure 5a are arranged to face each other The extended electrode portions 15a and 15b formed by extending are formed in the electrical cutting regions ER2 and ER4 and the physical cutting regions ER1 and ER5.
- the four electrical disconnect portions 13a, 13b, 13d, and 13c (13e, 13f, 13h, and 13g) that can disconnect the source side select gate electrode SG and the drain side select gate electrode DG.
- a portion 14b (14a) is provided, and the source-side selection gate electrode SG and the drain-side selection gate electrode DG are brought into a non-conductive state by the physical cutting portion 14b (14a).
- the physical cutting portion 14b whose cutting principle for cutting the source side selection gate electrode SG and the drain side selection gate electrode DG is different from the electrical cutting portions 13a, 13b, 13d, 13c. (14a) is also provided separately, so that the source-side selection gate electrode SG and the drain-side selection gate electrode DG can be cut more reliably than when only the electrical disconnecting portions 13a, 13b, 13d, and 13c are provided. Can do.
- the extended electrode portion 15a (15b) is folded back at the physical cutting region ER1 (ER5), and a plurality of electrical cutting portions 13a, 13b, 13d are formed at the electrical cutting region ER2 (ER4). , 13c (13e, 13f, 13h, 13g) are arranged in parallel. Thereby, in the memory cell forming portion 3a, even if the extended electrode portion 15a (15b) is provided with a plurality of electrical disconnecting portions 13a, 13b, 13d, 13c (13e, 13f, 13h, 13g), the memory cell forming portion It is possible to prevent the layout area from spreading in the longitudinal direction of 3a.
- each of the extended electrode portions 25a (25b) has 6 A configuration in which two electrical disconnecting portions 23a, 23b, 23c, 23f, 23e, and 23d are provided is shown.
- the extended electrode portion 25a (25b) of the memory cell formation portion 22a is formed in an E shape when viewed from above the semiconductor substrate, and is electrically disconnected from the end of the selection gate formation region ER9.
- the first side wall of the memory gate electrode MG extends to the physical cutting region ER1 (ER5) via the region ER2 (ER4) and is divided into two directions around the memory gate electrode MG in the physical cutting region ER1 (ER5) It is folded back to the 11th side and the second side wall 12 side and extends to the electrical cutting region ER2 (ER4).
- the extended electrode portion 25a includes an extended portion 26a that extends linearly from the memory gate electrode MG in the select gate formation region ER9, and a linear end formed at a laterally outward position of the extended portion 26a.
- the extension part 26a and the end parts 26b, 26c are electrically disconnected.
- a continuous portion 26d that is disposed in the region ER2 (ER4) and serves as a folded portion is disposed in the physical cutting region ER1 (ER5).
- the extended electrode portion 25a (25b) has one end portion 26b arranged on the first side wall 11 side of the memory gate electrode MG and the other end portion 26c of the memory gate electrode MG. It may be disposed on the second side wall 12 side.
- the memory gate electrode MG extends from the selection gate formation region ER9 as the extended electrode portion 25a (25b).
- the source side selection gate The electrode SG and the drain-side selection gate electrode DG are not extended, and instead of the source-side selection gate electrode SG and the drain-side selection gate electrode DG, six electrical electrodes are provided on the side wall of the extension electrode portion 25a (25b). Cutting portions 23a, 23b, 23c, 23f, 23e, and 23d are formed.
- these electrical cutting parts 23a, 23b, 23c, 23f, 23e, 23d all have the same configuration, i-type sidewall-like intrinsic semiconductor layers Ia, Ib, and sidewall-like
- the reverse-conductivity-type semiconductor layer OC is configured, and the reverse-conductivity-type semiconductor layer OC is formed between the intrinsic semiconductor layers Ia and Ib.
- the reverse conductivity type semiconductor layer OC is formed of a conductivity type (in this case, p-type) different from the source side select gate electrode SG and the drain side select gate electrode DG as described above.
- one electrical cut portion 23a is formed in the extended portion 26a of the extended electrode portion 25a (25b) along one side wall that is continuous with the first side wall 11 of the memory gate electrode MG.
- Another electrical cutting portion 23d is formed along the other side wall that is provided flush with the second side wall 12 of the memory gate electrode MG.
- an electrical disconnection portion 23a forms a pin junction from the first side wall 11 of the memory gate electrode MG along the side wall of the extension portion 26a, starting from the n-type source side selection gate electrode SG. Can do.
- a pin junction may be formed along the side wall of the extension 26a.
- one end portion 26b arranged on the first side wall 11 side of the memory gate electrode MG is formed with one electrical cutting portion 23b on the side wall facing the extension portion 26a, and on the side wall arranged outside.
- Another electrical cutting part 23c is formed.
- the other end portion 26c arranged on the second side wall 12 side of the memory gate electrode MG is formed with one electrical cutting portion 23e on the side wall facing the extension portion 26a, and on the side wall arranged outside.
- Another electrical cutting part 23f is formed.
- the extended electrode portion 25a (25b) is formed along the second side wall 12 of the memory gate electrode MG from the source side selection gate electrode SG formed along the first side wall 11 of the memory gate electrode MG.
- Six electrical disconnections 23a, 23b, 23c, 23f, 23e, and 23d can be formed in this order on the sidewall between the drain-side selection gate electrode DG.
- three or more reverse conductivity type semiconductor layers and intrinsic semiconductor layers are provided on the side walls of the extended electrode portions 25a and 25b.
- the connecting portion 26d as the sidewall non-forming portion in the physical cutting region ER1 includes one side wall of the extension portion 26a and the side wall of one end portion 26b on the first side wall 11 side.
- a physical cutting part 24b is formed on one inner peripheral wall that is connected to the other side wall, and another inner wall that connects the other side wall of the extension part 26a and the side wall of the other end part 26c on the second side wall 12 side.
- a physical cutting portion 24c is formed on the peripheral wall, and a physical cutting portion 24a is also formed on the outer peripheral wall connecting the side walls of the end portions 26b and 26c.
- These physical cutting portions 24a, 24b, and 24c are provided with a conductive layer such as a semiconductor material along the outer peripheral wall and inner peripheral wall of the continuous portion 26d, and the outer peripheral wall and inner peripheral wall of the continuous portion 26d are exposed to the outside. It has an exposed configuration. Thereby, the physical cut portions 24a, 24b, 24c form a physical cut by providing a gap between the source side select gate electrode SG and the drain side select gate electrode DG, and the source side select gate electrode SG and The drain side select gate electrode DG can be turned off.
- a conductive layer such as a semiconductor material along the outer peripheral wall and inner peripheral wall of the continuous portion 26d
- the first physical cutting portion 24a is formed along the outer peripheral wall of the continuous portion 26d provided continuously to the side walls of the end portions 26b and 26c, and one end portion 26b.
- a gap is formed between the electrical cutting portion 23c formed on the side wall of the other end and the electrical cutting portion 23f formed on the side wall of the other end portion 26c, and the electrical cutting portions 23c and 23f are not electrically connected to each other.
- the second physical cutting part 24b is formed along one inner peripheral wall of the connecting part 26d connected to the side wall of the extension part 26a and the side wall of the end part 26b, and is formed on the side wall of the extension part 26a.
- a gap is formed between the one electrical cut portion 23a formed and the electrical cut portion 23b formed on the side wall of the end portion 26b, and the electrical cut portions 23a and 23b are in a non-conductive state.
- the third physical cutting portion 24c is formed along the other inner peripheral wall of the continuous portion 26d provided continuously to the side wall of the extension portion 26a and the side wall of the end portion 26c.
- a gap is formed between the other electrical cut portion 23d formed and the electrical cut portion 23e formed on the side wall of the end portion 26c, and the electrical cut portions 23d and 23e are in a non-conductive state.
- the extended electrode portion 25a is formed along the second side wall 12 of the memory gate electrode MG from the source-side selection gate electrode SG formed along the first side wall 11 of the memory gate electrode MG.
- the electrical cutting part 23a, the physical cutting part 24b, the electrical cutting part 23b, 23c, the physical cutting part 24a, the electrical cutting part 23f, 23e, The physical cutting part 24c and the electrical cutting part 23d can be arranged in this order.
- the extended electrode portion 15a includes the six electrical cut portions 23a, 23b, 23c, 23f, 23e, and 23d and the three physical cut portions 24b, 24a, and 24c, and the source-side selection gate electrode SG and It is possible to prevent the drain side select gate electrode DG from becoming conductive.
- the memory cell formation portion 22a also extends six electrical disconnect portions 23a, 23b, 23c, 23f, 23e, and 23d that can disconnect the source side select gate electrode SG and the drain side select gate electrode DG.
- the number of locations where the source-side selection gate electrode SG and the drain-side selection gate electrode DG are cut is increased compared to the conventional one, so that the data read operation than the conventional one Read malfunctions sometimes caused by voltage fluctuations can be prevented.
- the electrical cut portion 23e, 23d is provided with a physical cut portion 24b, 24a, 24c in which a sidewall-like semiconductor material is not formed, and the three physical cut portions 24b, 24a, 24c provide a source side select gate electrode SG and a drain side select gate.
- the electrode DG was brought into non-contact to be in a non-conductive state.
- the cutting principle for cutting the source side selection gate electrode SG and the drain side selection gate electrode DG is different from that of the electrical cutting portions 23a, 23b, 23c, 23f, 23e, and 23d. Since the separate cutting portions 24b, 24a, and 24c are also provided separately, the source-side selection gate electrode SG and the drain-side selection gate electrode are compared to the case where only the electrical cutting portions 23a, 23b, 23c, 23f, 23e, and 23d are provided. DG can be cut more securely.
- the extended electrode portion 25a (25b) is folded back at the physical cutting region ER1 (ER5), and a plurality of electrical cutting portions 23a, 23b, 23c are formed at the electrical cutting region ER2 (ER4).
- ER1 physical cutting region
- 23f, 23e, and 23d are all arranged in parallel, it is possible to suppress the layout area from spreading in the longitudinal direction of the memory cell forming portion 22a.
- the extended electrode portions 15a and 15b are provided as a part of the configuration of the memory cell forming portions 3a, 3b and 3c.
- the nonvolatile semiconductor memory device 1 having the independent configuration for each of the memory cell forming portions 3a, 3b, and 3c has been described, the present invention is not limited to this, and for example, the same reference numerals are used for corresponding portions to FIG. 6, the extended electrode portions 35a, 35b are provided separately from the memory cell forming portions 32a, 32b, 32c,..., And the memory cell forming portions 32a, 32b, 32c,.
- the non-volatile semiconductor memory device 31 may be connected continuously with the electrode portions 35a and 35b.
- the memory cell formation portion 32a (32b, 32c) includes the source side select gate structure 6a (6b, 6c) and the drain side select gate structure 5a (5b) across the memory gate structure 4a (4b, 4c).
- 5c) has a select gate formation region ER9 arranged opposite to each other.
- a memory gate electrode MG extending in the row direction is provided in the selection gate formation region ER9, and the memory gate electrode A cap film CP is formed on the MG.
- the memory cell formation portion 32a in the first row and the memory cell formation portion 32b in the second row adjacent to the memory cell formation portion 32a in the first row are the drains formed in the well W.
- the region WD is shared, and the drain is connected to the memory cell 2a (2b, 2c) of the memory cell formation portion 32a of the first row and the memory cell 2d (2e, 2f) of the memory cell formation portion 32b of the second row
- the same bit voltage can be applied uniformly through the region WD.
- the memory cell formation portion 32b in the second row adjacent to the memory cell formation portion 32a in the first row must share the drain region WD between the memory cell formation portion 32a in the first row.
- the second side wall 12 of the memory gate electrode MG on which the drain-side selection gate electrode DG is arranged is arranged opposite to the second side wall 12 of the memory gate electrode MG in the memory cell formation portion 32a of the first row.
- the memory gate electrodes MG formed in these memory cell forming portions 32a, 32b, 32c,... are electrically connected to the electrical cutting region ER2 (ER4) and the physical cutting region ER1 (from the selection gate forming region ER9).
- ER5 extended electrode portions 35a and 35b are formed in the electrical cutting region ER2 (ER4) and the physical cutting region ER1 (ER5).
- the extended electrode portions 35a and 35b are formed in a comb shape when viewed from above the semiconductor substrate, and the memory gate electrodes MG of the memory cell forming portions 32a, 32b, 32c,.
- extension portions 36a that extend in the shape of a line and the linear end portions 36b that are formed laterally outward of the extension portions 36a are alternately arranged along the column direction in which the memory cell formation portions 32a, 32b, 32c,. Can be arranged.
- the extension 36a and the end 36b are formed in the electrical cutting regions ER2 and ER4, and are connected by a continuous portion (side wall non-forming portion) 36c formed in the physical cutting regions ER1 and ER5. ing.
- the memory cell formation part 32b in the second row has the second side wall 12 of the memory gate electrode MG in which the drain side selection gate electrode DG is formed, and the drain side selection gate electrode in the adjacent memory cell formation part 32b in the first row.
- the second side wall 12 of the formed memory gate electrode MG is connected to the inner side walls of the extended electrode portions 35a and 35b.
- the extended electrode portions 35a and 35b are connected to the memory gate in the memory cell forming portion 32a in the first row from the second side wall 12 of the memory gate electrode MG in the memory cell forming portion 32b in the second row.
- Four electrical cutting portions 33a, 33b, 33c, and 33d are formed in this order along the side wall of the electrode MG up to the second side wall 12.
- the extended electrode portions 35a and 35b are electrically disconnected along the side wall of the extended portion 36a formed flush with the second side wall 12 of the memory gate electrode MG in the memory cell forming portion 32b in the second row.
- 33a is formed, and an electrical cut portion 33d is formed along the side wall of the extension portion 36a formed flush with the second side wall 12 of the memory gate electrode MG in the memory cell formation portion 32a of the first row.
- the end portion 36b of the extended electrode portions 35a and 35b extending in the row direction between the memory cell forming portion 32a in the first column and the memory cell forming portion 32b in the second column has a memory cell forming portion in the first row.
- One electrical cut portion 33c is formed along the side wall disposed on the 32a side
- another electrical cut portion 33b is formed along the side wall disposed on the memory cell forming portion 32b side of the second row.
- Electrodes 35a and 35b In the electrode portions 35a and 35b, four electrical cutting portions 33a, 33b, 33c and 33d can be formed in this order along the side walls. Thus, three or more reverse conductivity type semiconductor layers and intrinsic semiconductor layers are provided on the side walls of the extended electrode portions 35a and 35b.
- the connecting portion 36c in the physical cutting region ER1 includes, for example, the side wall of the extension portion 36a continuously connected to the memory cell forming portion 32b in the second row, and the memory cell forming portion 32b in the second row. Further, a physical cut portion 34c is formed on one inner peripheral wall connecting the side wall of the end portion 36b between the memory cell forming portions 32a in the first row.
- the continuous portion 36c in the physical cutting region ER1 includes, for example, the side wall of the extended portion 36a continuously connected to the memory cell forming portion 32a in the first row, the memory cell forming portion 32a in the first row, and the second row.
- a physical cutting portion 34b is formed on the other inner peripheral wall connecting the side wall of the end portion 36b between the memory cell forming portions 32b.
- These physical cutting portions 34b and 34c have a configuration in which the inner peripheral wall of the continuous portion 36c is exposed to the outside without providing a conductive layer such as a semiconductor material along the inner peripheral wall of the continuous portion 36c.
- the physical cut portions 34b and 34c have a gap between the drain side selection gate electrode DG in the memory cell formation portion 32a in the first row and the drain side selection gate electrode DG in the memory cell formation portion 32b in the second row.
- the drain-side selection gate electrode DG of the memory cell formation portion 32a in the first row and the drain-side selection gate electrode DG of the memory cell formation portion 32b in the second row are in a non-conductive state It can be.
- the extended electrode portions 35a and 35b include the drain-side selection gate electrode DG in the memory cell formation portion 32b in the second row to the drain-side selection gate electrode DG in the memory cell formation portion 32a in the first row.
- the electrical cutting part 33a, the physical cutting part 34c, the electrical cutting parts 33b and 33c, the physical cutting part 34b, and the electrical cutting part 33d can be arranged in this order on the side wall between them.
- the extended electrode portions 35a and 35b are connected to the drains of the memory cell forming portion 32a in the first row by the four electrical disconnections 33a, 33b, 33c, and 33d and the two physical disconnections 34b and 34c.
- the side selection gate electrode DG and the drain side selection gate electrode DG of the memory cell formation portion 32b in the second row can be prevented from becoming conductive.
- the extended electrode portions 35a and 35b have end portions 36b extending from the continuous portions 36c of the physical cutting regions ER1 and ER5 toward the electrical cutting regions ER2 and ER4, and adjacent memory cell forming portions 32a. , 32b can be prevented from spreading in the longitudinal direction of the memory cell forming portions 32a, 32b by the end portion 36b.
- the memory cell formation portion 32b in the second row and the memory cell formation portion 32c in the third row adjacent to the memory cell formation portion 32b in the second row share the source region WS formed in the well W.
- the same source voltage can be applied uniformly to the memory cells 2d, 2e, 2f of the memory cell formation unit 32b in the second row and the memory cells 2g, 2h, 2i of the memory cell formation unit 32c in the third row.
- the memory cell formation portion 32b in the second row adjacent to the memory cell formation portion 32c in the third row shares the source region WS between the memory cell formation portion 32c in the third row.
- the first side wall 11 of the memory gate electrode MG on which the source-side selection gate electrode SG is disposed is disposed to face the first side wall 11 of the memory gate electrode MG in the memory cell formation portion 32c in the third row.
- the memory cell formation part 32b in the second row has the first side wall 11 of the memory gate electrode MG in which the source side selection gate electrode SG is formed, the source side selection gate in the memory cell formation part 32c in the adjacent third row.
- the first side wall 11 of the memory gate electrode MG on which the electrode SG is formed is connected to the inner side walls of the extended electrode portions 35a and 35b.
- the extended electrode portions 35a and 35b include a memory gate in the memory cell formation portion 32c in the third row from the first side wall 11 of the memory gate electrode MG in the memory cell formation portion 32b in the second row.
- Four electrical cutting portions 33e, 33f, 33g, and 33h are formed in this order along the side wall of the electrode MG up to the first side wall 11.
- the extended electrode portions 35a and 35b are electrically disconnected along the side wall of the extended portion 36a formed flush with the first side wall 11 of the memory gate electrode MG in the memory cell forming portion 32b in the second row.
- 33e is formed, and an electrical cut portion 33h is formed along the side wall of the extended portion 36a formed flush with the first side wall 11 of the memory gate electrode MG in the memory cell forming portion 32c in the third row.
- the end portion 36b of the extended electrode portions 35a and 35b extending in the row direction between the memory cell forming portion 32b in the second column and the memory cell forming portion 32c in the third column is connected to the memory cell forming portion in the second row.
- One electrical cut portion 33f is formed along the side wall disposed on the 32b side
- another electrical cut portion 33g is formed along the side wall disposed on the memory cell forming portion 32c side of the third row.
- the first sidewall 11 of the memory gate electrode MG in the memory cell formation portion 32b in the second row extends to the first sidewall 11 of the memory gate electrode MG in the memory cell formation portion 32c in the third row.
- four electrical cutting portions 33e, 33f, 33g, and 33h can be formed in this order along the side walls.
- the connecting portion 36c in the physical cutting region ER1 includes, for example, the side wall of the extension portion 36a continuously connected to the memory cell forming portion 32b in the second row, and the memory cell forming portion 32b in the second row.
- a physical cutting part 34e is formed on one inner peripheral wall connecting the side wall of the end part 36b between the memory cell forming parts 32c in the third row.
- the continuous portion 36c in the physical cutting region ER1 includes, for example, the side wall of the extended portion 36a connected to the memory cell forming portion 32c in the third row, the memory cell forming portion 32c in the third row, and the second row.
- a physical cutting portion 34d is formed on the other inner peripheral wall connecting the side wall of the end portion 36b between the memory cell forming portions 32b.
- These physical cutting portions 34e and 34d also have a configuration in which the inner peripheral wall of the continuous portion 36c is exposed to the outside without providing a conductive layer such as a semiconductor material along the inner peripheral wall of the continuous portion 36c.
- the physical cut portions 34e and 34d have a gap between the source side selection gate electrode SG in the memory cell formation portion 32b in the second row and the source side selection gate electrode SG in the memory cell formation portion 32c in the third row.
- the source-side selection gate electrode SG of the memory cell formation portion 32b in the second row and the source-side selection gate electrode SG of the memory cell formation portion 32c in the third row are in a non-conductive state It can be.
- the extended electrode portions 35a and 35b include the source-side selection gate electrode SG in the memory cell formation portion 32b in the second row to the source-side selection gate electrode SG in the memory cell formation portion 32c in the third row.
- the electrical cutting part 33e, the physical cutting part 34e, the electrical cutting parts 33f and 33g, the physical cutting part 34d, and the electrical cutting part 33h can be arranged in this order on the side wall therebetween.
- the extended electrode portions 35a and 35b are connected to the source of the memory cell forming portion 32b in the second row by the four electrical cutting portions 33e, 33f, 33g, and 33h and the two physical cutting portions 34e and 34d.
- the side selection gate electrode SG and the source side selection gate electrode SG of the memory cell formation portion 32c in the third row can be prevented from being brought into conduction.
- the non-volatile semiconductor memory device 31 includes electrically disconnected regions ER2, ER4 formed on the memory gate electrodes MG of the memory cell forming portions 32a, 32b, 32c,.
- a cap film CP is formed on each of the inner extension 36a and on the end 36b in each of the electrical cutting regions ER2 and ER4.In the manufacturing process, the cap film CP causes the memory gate electrode MG and The upper surfaces of the extension part 36a and the end part 36b can be prevented from being salicided.
- the cap film CP is not formed on the continuous portion 36c formed by extending the memory gate electrode MG, and the continuous portion 36c is exposed to the outside. Therefore, the upper surface is salicided, and the columnar memory gate contact MGC is provided via a silicide layer (not shown) formed on the continuous portion 36c.
- four electrically disconnected portions 33e, 33f, 33g, 33h that can cut the source side select gate electrodes SG of the adjacent memory cell forming portions 32b, 32c are extended electrode portions. Provided along the other side walls of 35a and 35b, and the number of locations where the source side select gate electrodes SG are cut from each other is increased compared to the conventional one, thereby preventing the read malfunction caused by the voltage fluctuation during the data read operation than before. Can do.
- the sidewall-like semiconductor material is provided with non-formed physical cut portions 34c and 34b, and the two physical cut portions 34c and 34b make the drain-side selection gate electrodes DG non-contact with each other to be in a non-conductive state.
- the physical cutting portions 34c and 34b whose cutting principle for cutting the drain-side selection gate electrodes DG is different from the electrical cutting portions 33a, 33b, 33c, and 33d are separately provided.
- the drain-side selection gate electrodes DG By providing the drain-side selection gate electrodes DG, the drain-side selection gate electrodes DG can be cut more reliably than when only the electrical cutting portions 33a, 33b, 33c, and 33d are provided. Similarly, between the adjacent memory cell forming portions 32b and 32c, the physical cutting portions 34e and 34d whose cutting principle for cutting the source-side selection gate electrodes SG is different from the electrical cutting portions 33e, 33f, 33g, and 33h. Further, by providing separately, the source-side selection gate electrodes SG can be cut more reliably than when only the electrical cutting portions 33e, 33f, 33g, and 33h are provided.
- the extended electrode portion 35a (35b) is folded back to the electrical cutting region ER2 (ER4) side in the physical cutting region ER1 (ER5), and an end portion 36b is provided between the adjacent memory cell forming portions 32a and 32b.
- a plurality of electrical cutting parts 23a, 23b, 23c, 23f, 23e, and 23d are all arranged in parallel in the electrical cutting area ER2 (ER4) by the extension 36a and the end 36b arranged in the electrical cutting area ER2 (ER4). It was made to arrange.
- the provision of the end 36b can prevent the electrical cutting region ER2 (ER4) from spreading in the longitudinal direction of the memory cell forming portion 32a, and can be downsized and highly integrated. Can be realized.
- the source side select gate electrodes SG of the adjacent memory cell forming portions 32b and 32c can be electrically connected to each other.
- the source side selection gate electrodes SG of the memory cell forming portions 32b and 32c are electrically connected to each other. Even when connected, the voltage fluctuation at the source-side selection gate electrode SG and the voltage fluctuation at the drain-side selection gate electrode DG due to a short circuit failure during the data read operation can be prevented.
- the nonvolatile semiconductor memory device 31 due to manufacturing defects, for example, the side wall of the extended electrode portion 35a that is connected to the second side wall 12 of each memory gate electrode MG between the memory cell forming portions 32a and 32b adjacent on the other side, for example.
- the drain side select gate electrodes DG of the adjacent memory cell forming portions 32a and 32b can be electrically connected to each other.
- the nonvolatile semiconductor memory device 31 can electrically connect the same type of drain side select gate electrodes DG that are highly likely to be applied with the same voltage during the data read operation. Sometimes, the probability of occurrence of voltage fluctuations at the drain side select gate electrode DG can be reduced.
- the nonvolatile semiconductor memory device 41 may be provided in which the continuous regions ER10 and ER11 are provided and the adjacent memory cell forming portions 42a and 42b are continuously provided in the continuous regions ER10 and ER11.
- each memory gate structure 4a, 4b of each memory cell formation portion 42a, 42b is provided with a linear memory gate electrode MG extending in the row direction in the selection gate formation region ER9, and the memory gate electrode MG A cap film CP is formed thereon.
- the nonvolatile semiconductor memory device 41 is provided with continuous regions ER10 and ER11 adjacent to the select gate formation region ER9, and an electric terminal is electrically connected to the end of the continuous region ER10 (ER11).
- a physical cutting region ER1 (ER5) is provided via the cutting region ER2 (ER4).
- the memory gate electrode MG extends in the continuous region ER10 (ER11), the electrical cutting region ER2 (ER4), and the physical cutting region ER1 (ER5), and is formed by the memory gate electrode MG. Further, an extended electrode portion 45a (45b) is provided.
- the adjacent memory cell formation portions 42a and 42b share the source region WS formed in the well W, and the memory cells 2d, 2e and 2f of the one memory cell formation portion 42a and the other memory cell formation
- the same source voltage can be uniformly applied from the source region WS to the memory cells 2g, 2h, 2i of the part 42b.
- the first side walls 11 of the memory gate electrode MG are arranged to face each other, and side wall-like source side select gate electrodes SG are opposed to each other along the first side wall 11. It has the structure provided.
- adjacent memory cell forming portions 42a and 42b have the ends of the memory gate electrode MG connected continuously by extended electrode portions 45a and 45b in continuous regions ER10 and ER11.
- the extended electrode portions 45a and 45b are formed in an E shape when viewed from above the semiconductor substrate, and the continuous regions ER10 and ER11, the electrical cutting region, starting from the central portion of the memory cell forming portion ER2 and ER4 and physical cutting areas ER1 and ER5 are provided as mirror objects.
- the extended electrode portions 45a and 45b are electrically disconnected from the branch connection portions 46a provided in the connection regions ER10 and ER11 and connected to the memory gate electrodes MG of the memory cell formation portions 43a and 42b.
- Extension portions 46b and 46f provided in the regions ER2 and ER4 and extending from the branch connecting portion 46a along the longitudinal direction of the memory gate electrode MG, and also provided in the electrical cutting regions ER2 and ER4, and the extension portions 46b, End portions 46d disposed between 46f, and sidewall non-forming portions 46c, 46g, 46e provided in the physical cutting regions ER1, ER5 and disposed at the ends of the extended portions 46b, 46f and the end portions 46d, respectively It consists of
- the adjacent memory cell forming portions 42a and 42b are divided into the first side wall 11 of the memory gate electrode MG in one memory cell forming portion 42a and the first side wall 11 of the memory gate electrode MG in the other memory cell forming portion 42b.
- a sidewall-like semiconductor layer 11a is formed along the side wall 47a.
- the source-side selection gate electrode SG in one memory cell formation portion 42a and the other memory cell formation portion 42b The source side select gate electrode SG is connected to the semiconductor layer 11a.
- a wide selection gate contact forming portion Ca in which a source side selection gate contact SGC is provided is formed at a predetermined position of the semiconductor layer 11a in the branch connection portion 46a.
- the selection gate contact forming portion Ca includes a climbing portion that rides on the branch connection portion 46a and a planar portion that has a planar surface along the semiconductor substrate.
- the source-side selection gate line ( A columnar source-side selection gate contact SGC to which a flat plate portion (not shown) is connected is provided on the plane portion.
- the selection gate contact forming portion Ca has a plane portion arranged in the selection gate contact regions ER6 and ER7 and a riding portion arranged in the continuous regions ER10 and ER11.
- the selection gate contact formation portion Ca is provided in the semiconductor layer 11a in the branch connection portion 46a.
- the present invention is not limited thereto, and the selection gate contact region is not limited thereto.
- the selection gate contact forming portion Ca may be provided on the source side selection gate electrode SG in ER6 and ER7.
- sidewall-like semiconductor layers 11b are also formed on the U-shaped side walls 47b and 47c facing the side wall 47a provided with the selection gate contact forming portion Ca. .
- the semiconductor layer 11b is formed on the U-shaped side walls 47b and 47c of the branch connection portion 46a when the source side selection gate electrode SG and the drain side selection gate electrode DG of the memory cell formation portions 42a and 42b are formed. It remains.
- the memory cell forming portions 42a and 42b include sidewalls along the second side wall 12 that faces the first side wall 11 of the memory gate electrode MG and is on the drain region WD side of the well W.
- a drain-side selection gate electrode DG is formed.
- the memory cell forming unit 42a shares a drain region WD with an adjacent memory cell forming unit (not shown), and the same bit voltage as that of the memory cell 2d of one memory cell forming unit 42a is applied to an adjacent memory (not shown). It can also be applied to one memory cell of the cell formation portion.
- the extension portions 46b and 46f and the end portion 46d provided in the electrical cutting region ER2 are not formed with the source side selection gate electrode SG and the drain side selection gate electrode DG on the side walls, and extend along the side walls.
- six electrical cutting portions 43a, 43b, 43c, 43f, 43e, 43d are formed.
- these electrical cutting portions 43a, 43b, 43c, 43f, 43e, 43d all have the same configuration, i-type sidewall-like intrinsic semiconductor layers Ia, Ib, and sidewall-like
- the reverse-conductivity-type semiconductor layer OC is configured, and the reverse-conductivity-type semiconductor layer OC is formed between the intrinsic semiconductor layers Ia and Ib.
- the reverse conductivity type semiconductor layer OC is formed of a conductivity type (in this case, p-type) different from that of the source side select gate electrode SG and the drain side select gate electrode DG.
- One extended portion 46b of the extended electrode portion 45a has one electric line along one side wall that is continuous with the second side wall 12 of the memory gate electrode MG in the one memory cell forming portion 42a.
- a cutting portion 43a is formed, and another electrical cutting portion 43b is formed along the other side wall disposed opposite to the one side wall.
- the branch continuous connection part 46a and the extension part 46b from the second side wall 12 of the memory gate electrode MG starting from the n-type drain side selection gate electrode DG.
- a pin junction can be formed along the side wall of the substrate.
- the other extended portion 46f of the extended electrode portion 45a is provided along one side wall that is continuous with the second side wall 12 of the memory gate electrode MG in the other memory cell forming portion 42b.
- the electrical cutting portion 43f is formed, and another electrical cutting portion 43e is formed along the other side wall disposed opposite to the one side wall.
- the branch continuous connection part 46a and the extension part 46f start from the second side wall 12 of the memory gate electrode MG, starting from the n-type drain side selection gate electrode DG.
- a pin junction can be formed along the side wall of the substrate.
- the end portion 46d of the extended electrode portion 45a extends linearly from the branch continuous portion 46a along the longitudinal direction of the extended portions 46b and 46f, and is disposed between the extended portions 46b and 46f. Yes.
- one electrical cut portion 43c is formed on the side wall facing one extension portion 46b
- another electrical cut portion 43d is formed on the side wall facing the other extension portion 46f. ing.
- another memory cell is formed from the drain-side selection gate electrode DG formed along the second side wall 12 of the memory gate electrode MG in the one memory cell formation portion 42a.
- the side wall non-forming portions 46c, 46e, 46g in the physical cutting region ER1 are formed with physical cutting portions 44a, 44b, 44c on the side walls. These physical cut portions 44a, 44b, 44c are formed on the sidewall non-formed portions 46c, 46e, 46g without providing a conductive layer such as a semiconductor material along the side walls of the sidewall non-formed portions 46c, 46e, 46g. The side wall is exposed to the outside. As a result, the physical cut portions 44a, 44b, and 44c provide a gap between the drain side selection gate electrode DG in one memory cell formation portion 42a and the drain side selection gate electrode DG in the other memory cell formation portion 42b. Thus, a physical disconnection can be formed, and the drain-side selection gate electrodes DG can be made non-conductive.
- the extended electrode portion 45a includes another memory cell from the drain-side selection gate electrode DG formed along the second sidewall 12 of the memory gate electrode MG in the one memory cell formation portion 42a.
- the electrical cutting unit 43a, the physical cutting unit 44a, and the electrical cutting unit 43b 43c, physical cutting part 44b, electrical cutting parts 43d, 43e, physical cutting part 44c and electrical cutting part 43f can be arranged in this order.
- the extended electrode portion 45a has a drain-side selection gate formed by these six electrical cutting portions 43a, 43b, 43c, 43d, 43e, and 43f and the three physical cutting portions 44a, 44b, and 44c. It is possible to prevent the electrodes DG from becoming conductive.
- the drain side selection gate electrode DG in one memory cell formation portion 42a and the drain side selection gate electrode DG in the other memory cell formation portion 42b can be disconnected.
- the electrical cutting parts 43a, 43b, 43c, 43d, 43e, 43f along the side wall of the extended electrode part 45a (45b), and increasing the number of places where the drain side select gate electrodes DG are cut from each other Accordingly, it is possible to prevent a read malfunction caused by voltage fluctuations during a data read operation than before.
- the side wall is formed between the electrical cut portions 43a and 43b formed along the side wall, between the electrical cut portions 43c and 43d, and between the electrical cut portions 43e and 43f.
- the non-formed physical cut portions 44a, 44b, and 44c are provided, and the three physical cut portions 44a, 44b, and 44c make the drain side select gate electrodes DG non-contact with each other to be in a non-conductive state. did.
- the physical cutting portion in which the cutting principle for cutting the drain-side selection gate electrodes DG is different from that of the electrical cutting portions 43a, 43b, 43c, 43d, 43e, and 43f. 44a, 44b, 44c are also provided separately, so that the drain-side selection gate electrodes DG can be cut more reliably than when only the electrical cutting portions 43a, 43b, 43c, 43d, 43e, 43f are provided. it can.
- the extended electrode portion 45a (45b) is folded back at the physical cutting region ER1 (ER5), and the end portion 46d and the extension are extended to the electrical cutting region ER2 (ER4).
- Portions 46b and 46f are provided, and a plurality of electrical cutting portions 43a, 43b, 43c, 43d, 43e, and 43f are arranged in parallel in the electrical cutting region ER2 (ER4) by the end portions 46d and the extended portions 46b and 46f. I tried to make it.
- the electrical disconnect region ER2 expands in the longitudinal direction of the memory cell formation portions 42a and 42b, because the end portions 46d are not arranged in series with the extension portions 46b and 46f. Can be prevented.
- the drain side select gate electrodes DG of the adjacent memory cell forming portions 42a and 42b can be electrically connected to each other.
- the nonvolatile semiconductor memory device 41 since the same type of drain-side selection gate electrodes DG that are likely to be applied with the same voltage during the data read operation can be electrically connected, the data read operation Sometimes, the probability of occurrence of voltage fluctuations at the drain side select gate electrode DG can be reduced.
- the electrical connection between the first selection gate electrode in one memory cell formation portion and the first selection gate electrode or the second selection gate electrode in the other memory cell formation portion As an electrical disconnection part that disconnects a general connection, the electrical connection between the drain-side selection gate electrode DG of one memory cell formation part 42a and the drain-side selection gate electrode DG of another memory cell formation part 42b is disconnected.
- the present invention is not limited to this, and the source-side selection gate electrode of one memory cell formation portion and other memories are applied. You may apply the electrical disconnection part which cut
- an electrical disconnecting part for disconnecting electrical connection between the drain side select gate electrode of one memory cell forming part and the source side select gate electrode in another memory cell forming part. You may apply.
- the source region WS is not shared, and the drain side select gate electrode DG of the other memory cell forming portion 42b shown in FIG. The configuration is replaced with the electrode SG.
- the present invention is not limited to this embodiment, and various modifications can be made within the scope of the gist of the present invention.
- the voltage value may be applied.
- the case where the source side selection gate electrode SG is used as the first selection gate electrode formed on the first sidewall of the memory gate electrode has been described.
- the present invention is not limited to this, and the drain-side selection gate electrode may be formed on the first sidewall of the memory gate electrode as the first selection gate electrode.
- the second selection gate electrode formed on the second sidewall of the memory gate electrode is a source side selection gate electrode.
- the electrical disconnecting portions 13a, 13b, 13d, and 13c (13e, 13f, 13h, and 13g) that form pin junctions starting from the drain-side selection gate electrode DG and the source-side selection gate electrode SG are used.
- 23a, 23b, 23c, 23f, 23e, 23d, 33a, 33b, 33c, 33d, 43a, 43b, 43c, 43d, 43e, 43f are described, but the present invention is not limited to this.
- an electrical cutting section that forms a nin junction structure, a pip junction structure, an npn junction structure, or a pnp junction structure, starting from the drain side selection gate electrode DG and the source side selection gate electrode SG, or by an electrical cutting section alone. May be provided. That is, on the side wall of the extended electrode portion extending from the memory gate electrode, either the reverse conductivity type semiconductor layer having a different conductivity type from the first selection gate electrode and the second selection gate electrode or the intrinsic semiconductor layer is 3 It is preferable that at least two are provided. At this time, it is desirable that a physical cut portion in which the semiconductor layer is not formed on the side wall of the extended electrode portion is formed between adjacent opposite conductivity type semiconductor layers or between adjacent intrinsic semiconductor layers. .
- the physical cutting regions ER1 and ER5 are provided.
- the present invention is not limited to this, and the physical cutting region ER1. , ER5 may be omitted, and only the electrical cutting regions ER2 and ER4 may be provided.
- 45a and 45b are provided has been described, the present invention is not limited to this, and for example, F-shaped, H-shaped, J-shaped, K-shaped, L-shaped, M-shaped, N-shaped
- An extended electrode portion having various shapes such as a shape, a T shape, a U shape, a V shape, a W shape, a Y shape, and a Z shape may be applied.
- the P-type well W is used to form a memory gate structure 4a that forms an N-type transistor structure and a drain-side selection gate structure 5a that forms an N-type MOS transistor structure.
- the source side select gate structure 6a that also forms an N-type MOS transistor structure has been described.
- the present invention is not limited to this, and an N-type well is used to form a P-type transistor.
- a memory gate structure that forms the structure, a drain-side selection gate structure that forms the P-type MOS transistor structure, and a source-side selection gate structure that also forms the P-type MOS transistor structure may be provided.
- the cap film formed on the top of the memory gate electrode MG the upper cap film made of an insulating material such as SiN different from the lower cap film CPa is formed on the lower cap film CPa.
- the cap film CP having a laminated structure in which CPb is laminated has been described, the present invention is not limited to this, and a single-layer cap film or a cap film having a laminated structure of three or more layers may be used.
- the extended electrode portions 15a, 15b, 15c, 15d are provided with four electrical disconnecting portions 13a, 13b, 13d, 13c (13e, 13f, 13h, 13g),
- the extended electrode portions 25a, 25b are provided with six electrical cutting portions 23a, 23b, 23c, 23f, 23e, 23d, and in the above-described third embodiment,
- the extended electrode portions 35a, 35b are provided with four electrical cutting portions 33a, 33b, 33c, 33d, and in the above-described fourth embodiment, the extended electrode portions 45a, 45b are provided with six electrical cutting portions 43a.
- the present invention is not limited to this, and if three or more electrical cutting portions are provided at various positions of the extended electrode portion, the number and shape of the electrically disconnected portions may be different in the extended electrode portions on both sides of the memory gate electrode, and the electrically disconnected portions may be formed asymmetrically with the memory gate electrode as the center.
- the electrical cutting region ER2 (ER4) and the physical cutting region ER1 (ER5) are provided in this order.
- the present invention is not limited to this, and the electrical cutting region ER2 (ER4) and physical The cutting positions ER1 (ER5) are arranged in reverse positions, and the physical cutting areas ER1 (ER5) and the electric cutting areas ER2 (ER4) are provided in this order on both sides of the selection gate formation area ER9. Good.
- FIG. 8 in which parts corresponding to those in FIG. 5 are denoted by the same reference numerals reverses the electrical cutting region ER2 (ER4) and the physical cutting region ER1 (ER5) of the memory cell forming portion 22a shown in FIG. 2 shows a planar layout of the memory cell forming portion 52 arranged in FIG.
- one physical cutting region ER11 is arranged at one end of the selection gate forming region ER9
- another physical cutting region ER15 is arranged at the other end of the selection gate forming region ER9.
- the electrical cutting region ER12 (ER14) is arranged at the end of the physical cutting region ER11 (ER15).
- a band-shaped memory gate electrode MG is extended in the selection gate formation region ER9, and the selection gate formation region ER9 is formed in the physical cutting region ER11 (ER15) and the electrical cutting region ER12 (ER14).
- An extended electrode portion 55a (55b) formed by extending the memory gate electrode MG as it is is provided.
- the extended electrode portion 55a (55b) is formed in a ⁇ shape having a tip trifurcated when viewed from above the semiconductor substrate, and is formed in the physical cutting region ER11 (ER15). It is composed of a continuous portion 56d, an extension portion 56a formed in the electrical cutting region ER12 (ER14), and end portions 56b and 56c.
- the continuous portion 56d includes a root portion 57a in which the physical cutting region ER11 (ER15) extends from the end of the memory gate electrode MG of the selection gate formation region ER9, and a branch portion 57b branched from the root portion 57a in a trifurcated manner.
- the extension portion 56a is formed at the central branch portion of the branch portion 57b, and the end portions 56b and 56c are formed at both end branch portions of the branch portion 57b.
- the continuous portion 56d as the side wall non-forming portion in the physical cutting region ER1 is physically cut into the outer peripheral wall connecting the first side wall 11 of the memory gate electrode MG and the side wall of the one end portion 56b.
- Part 54a is formed
- a physical cutting part 54b is formed on the outer peripheral wall connecting the side wall of one end part 56b and the side wall of the extension part 56a, and the other side wall and the other end part of the extension part 56a.
- a physical cutting portion 54c is formed in the outer peripheral wall connecting the side wall of 56c
- a physical cutting portion is formed in the outer peripheral wall connecting the side wall of the other end portion 56c and the second side wall 12 of the memory gate electrode MG.
- 54d is formed, and a total of four physical cutting portions 54a, 54b, 54c, 54d are provided.
- These physical cutting portions 54a, 54b, 54c, 54d are configured such that the outer peripheral wall of the continuous portion 56d is exposed to the outside without providing a conductive layer such as a semiconductor material along the outer peripheral wall of the continuous portion 56d.
- the physical cut portions 54a, 54b, 54c, and 54d are formed along the source side selection gate electrode SG formed along the first side wall 11 of the memory gate electrode MG and the second side wall 12 of the memory gate electrode MG.
- a gap may be provided between the formed drain-side selection gate electrode DG to form a physical cut, and the source-side selection gate electrode SG and the drain-side selection gate electrode DG may be turned off.
- the cap film CP is not formed on the continuous portion 56d in the physical cutting region ER11 (ER15) of the extended electrode portion 55a (55b), and the memory gate contact MGC is provided at a predetermined position. .
- electrical cutting portions 53c and 53d are formed on the opposing side walls of the extension portion 56a disposed on the extension line of the memory gate electrode MG in the selection gate formation region ER9, and the extension portion 56a. Electrically cut portions 53a and 53b are formed on opposite side walls of the end portion 56b formed at one laterally outward position of the extension portion 56a, and the end portion 56c formed at the other laterally outward position of the extension portion 56a is opposed to each other. Electrical cut portions 53e and 53f are formed on the side walls, and a total of six electrical cut portions 53a, 53b, 53c, 53d, 53e, and 53f are formed.
- cap film CP is formed on the extension part 56a and the end parts 56b and 56c in the electrical cutting region ER12 (ER14) of the extension electrode part 55a (55b), as in the memory gate electrode MG of the selection gate formation region ER9. Is formed.
- these electrical cutting portions 53a, 53b, 53c, 53d, 53e, and 53f all have the same configuration, i-type sidewall-like intrinsic semiconductor layers Ia and Ib, and sidewall-like shapes.
- the reverse-conductivity-type semiconductor layer OC is configured, and the reverse-conductivity-type semiconductor layer OC is formed between the intrinsic semiconductor layers Ia and Ib.
- the reverse conductivity type semiconductor layer OC is formed of a conductivity type (in this case, p-type) different from that of the source side select gate electrode SG and the drain side select gate electrode DG.
- the electrical disconnection portion 53a A pin junction can be formed from the first side wall 11 of the memory gate electrode MG along the side wall of the end 56b starting from the n-type source side selection gate electrode SG, and the current of the source side selection gate electrode SG is electrically disconnected. Can be blocked with ER2 (ER4).
- foreign matter also adheres to one electrical cutting portion 53a of the end portion 56b, and from the source-side selection gate electrode SG to the other electrical cutting portion 53b of the end portion 56b.
- the other electrical disconnection portion 53b of the end portion 56b causes the n-type source-side selection gate electrode SG to start from the first side wall 11 of the memory gate electrode MG to the side wall of the end portion 56b.
- a pin junction can be formed along the line, and the current of the source-side selection gate electrode SG can be cut off by the electrical cutting region ER2 (ER4).
- the memory 56 is connected to the connecting portion 56d of the physical cutting region ER1 provided between the selection gate forming region ER9 and the electric cutting region ER12 (ER14). Since the gate contact MGC is formed, it is necessary to ensure a sufficient alignment margin of the memory gate contact MGC for both the select gate formation region ER9 and the electrical cutting region ER12 (ER14).
- the width of the physical cutting region ER1 (ER5) can be made narrower than that of the memory cell forming portion 52 shown in FIG. 8, and thus the memory cell forming portion 52 shown in FIG. 8 can be formed more compactly. .
- the memory cell forming portion 52 provided with the extended electrode portions 55a and 55b branched in three is described.
- the present invention is not limited to this, and the extended electrode portion branched into two and four forks.
- the extended electrode portion branched as described above may be used, and the shape of the branch may be various shapes such as an F shape and a Y shape. Even in such an extended electrode part, a plurality of electrical cutting parts can be formed at the branch part, and the source side selection gate electrode SG and the drain side selection gate electrode DG are cut as in the above-described embodiment. It is possible to increase the number of locations to be increased than before.
- the arrangement positions of the electrical cutting area ER2 (ER4) and the physical cutting area ER1 (ER5) are reversed.
- the physical cutting area ER1 (ER5) and the electric cutting area ER2 (ER4) may be provided on both sides of the continuous areas ER10 and ER11 in this order.
- the sidewall non-forming portion 46c, 46e, 46g is provided at the end of the branch connecting portion 46a, and the extension portion 46b is provided at the tip of the sidewall non-forming portion 46c.
- An end 46d may be provided at the tip of 46e, and an extension 46f may be provided at the tip of the sidewall non-forming portion 46g.
- the number of the electrical disconnecting portions 43a, 43b, 43c, 43d, 43e, 43f can be increased, and the source-side selection gate electrode SG and the drain are correspondingly increased, as in the above-described embodiment.
- the number of locations where the side select gate electrode DG is cut can be increased as compared with the prior art.
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Abstract
Description
<1.第1の実施の形態>
1-1.メモリセルの構成
1-2.本発明による不揮発性半導体記憶装置の回路構成
1-3.不揮発性半導体記憶装置における各種動作時における電圧について
1-4.不揮発性半導体記憶装置の平面レイアウト
1-5.作用および効果
<2.第2の実施の形態による不揮発性半導体記憶装置の平面レイアウト>
<3.第3の実施の形態による不揮発性半導体記憶装置の平面レイアウト>
<4.第4の実施の形態による不揮発性半導体記憶装置の平面レイアウト>
<5.他の実施の形態>
<6.電気的切断領域と物理的切断領域との位置関係について>
(1-1)メモリセルの構成
先ず始めに、本発明の不揮発性半導体記憶装置に行列状に配置されるメモリセルの構成について以下説明する。図1に示すように、メモリセル2aは、例えばP型Si等でなるウエルW上に、N型のトランジスタ構造を形成するメモリゲート構造体4aと、N型のMOS(Metal-Oxide-Semiconductor)トランジスタ構造を形成するドレイン側選択ゲート構造体5aと、同じくN型のMOSトランジスタ構造を形成するソース側選択ゲート構造体6aとが形成されている。
次に、本発明による不揮発性半導体記憶装置の回路構成について説明する。図2に示すように、不揮発性半導体記憶装置1は、例えば複数のメモリセル2a,2b,2d,2e,2g,2h,2i,2jが行列状に配置されている。なお、各メモリセル2b,2d,2e,2g,2h,2i,2jは、図1にて説明したメモリセル2aと同一構成を有しており、メモリゲート線MGLが接続されたメモリゲート電極MGと、ドレイン側選択ゲート線DGL1(DGL2,DGL3,DGL4)が接続されたドレイン側選択ゲート電極DGと、ソース側選択ゲート線SGLが接続されたソース側選択ゲート電極SGとを有している。
次に、このような不揮発性半導体記憶装置1における各種動作について説明する。図3は、図2に示した不揮発性半導体記憶装置1において、例えばメモリセル2aの電荷蓄積層ECに電荷を注入するデータ書き込み動作時(「Prog」)と、メモリセル2aの電荷蓄積層ECに電荷が蓄積されているか否かを検知するデータ読み出し動作時(「Read」)と、メモリセル2a等の電荷蓄積層EC内の電荷を引き抜くデータ消去動作時(「Erase」)とにおける各部位での電圧値の一例を示す表である。
次に上述した不揮発性半導体記憶装置1の平面レイアウトについて以下説明する。図4は、半導体基板上に複数のメモリセル形成部3a,3b,3c,…が配置された本発明の不揮発性半導体記憶装置1を、半導体基板の上方から見た平面レイアウトを示す概略図である。なお、メモリセル形成部3a,3b,3c,…は全て同一構成を有しているため、ここでは一のメモリセル形成部3aに着目して以下説明する。
以上の構成において、メモリセル形成部3aでは、ソース側選択ゲート構造体6aおよびドレイン側選択ゲート構造体5aが対向配置された選択ゲート形成領域ER9のメモリゲート電極MGが延設されて形成された延設電極部15a,15bを、電気的切断領域ER2,ER4および物理的切断領域ER1,ER5に設けるようにした。
上述した実施の形態においては、電気的切断部が3つ以上形成されている延設電極部として、4つの電気的切断部13a,13b,13d,13c(13e,13f,13h,13g)が形成された延設電極部15a(15b)について述べたが、本発明はこれに限らず、電気的切断部が3つ以上形成されていれば延設電極部を種々の構成としてもよい。例えば、図4との対応部分に同一符号を付して示す図5は、第2の実施の形態による不揮発性半導体記憶装置21の平面レイアウトを示し、延設電極部25a(25b)にそれぞれ6つの電気的切断部23a,23b,23c,23f,23e,23dを設けた構成を示す。
上述した実施の形態においては、メモリセル形成部3a,3b,3cの構成の一部として延設電極部15a,15bを設け、各メモリセル形成部3a,3b,3c毎に独立した構成となっている不揮発性半導体記憶装置1について述べたが、本発明はこれに限らず、例えば、図4との対応部分に同一符号を付して示す図6のように、メモリセル形成部32a,32b,32c,…とは別に延設電極部35a,35bを設け、各メモリセル形成部32a,32b,32c,…を延設電極部35a,35bで連設させた不揮発性半導体記憶装置31でもよい。
なお、上述した第3の実施の形態においては、メモリセル形成部32a,32b,32c,…を物理的切断領域ER1,ER5で連設した不揮発性半導体記憶装置31について述べたが、本発明はこれに限らず、図4との対応部分に同一符号を付して示す図7のように、物理的切断領域ER1,ER5とは別に連設領域ER10,ER11を設け、隣接するメモリセル形成部42a,42bを連設領域ER10,ER11で連設した不揮発性半導体記憶装置41としてもよい。
なお、本発明は、本実施形態に限定されるものではなく、本発明の要旨の範囲内で種々の変形実施が可能であり、例えば各部位の電圧値について種々の電圧値を適用してもよい。また、上述した第1および第2の実施の形態においては、メモリゲート電極の第1側壁に形成される第1選択ゲート電極として、ソース側選択ゲート電極SGとした場合について述べたが、本発明はこれに限らず、ドレイン側選択ゲート電極を第1選択ゲート電極としてメモリゲート電極の第1側壁に形成してもよい。なお、この場合、メモリゲート電極の第2側壁に形成される第2選択ゲート電極は、ソース側選択ゲート電極となる。
さらに、上述した第1~第3の実施の形態においては、選択ゲート形成領域ER9を中心にして、選択ゲート形成領域ER9の両側に、電気的切断領域ER2(ER4)および物理的切断領域ER1(ER5)の順で設けるようにした場合について述べたが、本発明はこれに限らず、電気的切断領域ER2(ER4)および物理的切断領域ER1(ER5)の配置位置を逆にして設け、選択ゲート形成領域ER9の両側に、物理的切断領域ER1(ER5)および電気的切断領域ER2(ER4)の順で設けるようにしてもよい。
2a,2b,2c,2d,2e,2f,2g,2h,2i,2j メモリセル
3a,3b,3c,3d,22a,22b,22c,32a,32b,32c,42a,42b,52 メモリセル形成部
4a,4b,4c メモリゲート構造体
5a,5b,5c ドレイン側選択ゲート構造体
6a,6b,6c ソース側選択ゲート構造体
11 第1側壁
12 第2側壁
15a,15b,15c,15d,25a,25b,35a,35b,45a,45b,55a,55b 延設電極部
CP キャップ膜
ER9 選択ゲート形成領域
MG メモリゲート電極
DG ドレイン側選択ゲート電極
SG ソース側選択ゲート電極
Claims (5)
- 複数のメモリセル形成部が設けられた不揮発性半導体記憶装置であって、
前記メモリセル形成部は、
半導体基板のウエル上に第1選択ゲート絶縁膜を介して第1選択ゲート電極を有した第1選択ゲート構造体と、
前記ウエル上に第2選択ゲート絶縁膜を介して第2選択ゲート電極を有した第2選択ゲート構造体と、
該第1選択ゲート構造体および該第2選択ゲート構造体間に側壁スペーサを介して設けられ、下部ゲート絶縁膜、電荷蓄積層、上部ゲート絶縁膜、およびメモリゲート電極の順で前記ウエル上に積層されたメモリゲート構造体と、
前記第1選択ゲート構造体および前記第2選択ゲート構造体が対向配置された選択ゲート形成領域の前記メモリゲート電極から延設された延設電極部とを備え、
前記延設電極部の側壁には、前記第1選択ゲート電極および前記第2選択ゲート電極とは導電型が異なる逆導電型半導体層、または真性半導体層のいずれかが、3つ以上設けられている
ことを特徴とする不揮発性半導体記憶装置。 - 複数のメモリセル形成部が設けられた不揮発性半導体記憶装置であって、
前記メモリセル形成部は、
半導体基板のウエル上に第1選択ゲート絶縁膜を介して第1選択ゲート電極を有した第1選択ゲート構造体と、
前記ウエル上に第2選択ゲート絶縁膜を介して第2選択ゲート電極を有した第2選択ゲート構造体と、
該第1選択ゲート構造体および該第2選択ゲート構造体間に側壁スペーサを介して設けられ、下部ゲート絶縁膜、電荷蓄積層、上部ゲート絶縁膜、およびメモリゲート電極の順で前記ウエル上に積層されたメモリゲート構造体とを備えており、
一の前記メモリセル形成部と、他の前記メモリセル形成部とは、前記第1選択ゲート構造体および前記第2選択ゲート構造体が対向配置された選択ゲート形成領域の前記メモリゲート電極から延設した延設電極部により連設された構成を有し、
前記延設電極部の側壁には、前記第1選択ゲート電極および前記第2選択ゲート電極とは導電型が異なる逆導電型半導体層、または真性半導体層のいずれかが、3つ以上設けられている
ことを特徴とする不揮発性半導体記憶装置。 - 前記延設電極部は、
前記選択ゲート形成領域の前記メモリゲート電極から延長した延長部と、
側壁が前記延長部の側壁と対向するように配置され、前記延長部と並列的に配置された直線状の端部と、
前記延長部および前記端部を連設する連設部とを備え、
前記逆導電型半導体層または前記真性半導体層は、前記延長部および前記端部の側壁に沿って形成されている
ことを特徴とする請求項1または2に記載の不揮発性半導体記憶装置。 - 隣接する前記逆導電型半導体層同士、または隣接する前記真性半導体層同士の間には、前記延設電極部の側壁に半導体層が形成されていない物理的切断部が形成されている
ことを特徴とする請求項1~3のいずれか1項に記載の不揮発性半導体記憶装置。 - 前記メモリゲート電極の上面にはキャップ膜が設けられており、
前記延設電極部の前記物理的切断部が形成された物理的切断領域には、前記キャップ膜が形成されておらずメモリゲートコンタクトが設けられている
ことを特徴とする請求項4に記載の不揮発性半導体記憶装置。
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JP2005142354A (ja) * | 2003-11-06 | 2005-06-02 | Matsushita Electric Ind Co Ltd | 不揮発性半導体記憶装置及びその駆動方法及びその製造方法 |
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JP2011129816A (ja) * | 2009-12-21 | 2011-06-30 | Renesas Electronics Corp | 半導体装置 |
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JP2005142354A (ja) * | 2003-11-06 | 2005-06-02 | Matsushita Electric Ind Co Ltd | 不揮発性半導体記憶装置及びその駆動方法及びその製造方法 |
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