WO2016080146A1 - 半導体装置 - Google Patents
半導体装置 Download PDFInfo
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- WO2016080146A1 WO2016080146A1 PCT/JP2015/079945 JP2015079945W WO2016080146A1 WO 2016080146 A1 WO2016080146 A1 WO 2016080146A1 JP 2015079945 W JP2015079945 W JP 2015079945W WO 2016080146 A1 WO2016080146 A1 WO 2016080146A1
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Classifications
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C11/00—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor
- G11C11/02—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using magnetic elements
- G11C11/16—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using magnetic elements using elements in which the storage effect is based on magnetic spin effect
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- G11C11/1697—Power supply circuits
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C14/00—Digital stores characterised by arrangements of cells having volatile and non-volatile storage properties for back-up when the power is down
- G11C14/0054—Digital stores characterised by arrangements of cells having volatile and non-volatile storage properties for back-up when the power is down in which the volatile element is a SRAM cell
- G11C14/0081—Digital stores characterised by arrangements of cells having volatile and non-volatile storage properties for back-up when the power is down in which the volatile element is a SRAM cell and the nonvolatile element is a magnetic RAM [MRAM] element or ferromagnetic cell
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers
- H01L27/04—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being a semiconductor body
- H01L27/10—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being a semiconductor body including a plurality of individual components in a repetitive configuration
- H01L27/105—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being a semiconductor body including a plurality of individual components in a repetitive configuration including field-effect components
-
- 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
- H01L29/82—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by variation of the magnetic field applied to the device
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10B—ELECTRONIC MEMORY DEVICES
- H10B10/00—Static random access memory [SRAM] devices
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10B—ELECTRONIC MEMORY DEVICES
- H10B61/00—Magnetic memory devices, e.g. magnetoresistive RAM [MRAM] devices
- H10B61/20—Magnetic memory devices, e.g. magnetoresistive RAM [MRAM] devices comprising components having three or more electrodes, e.g. transistors
- H10B61/22—Magnetic memory devices, e.g. magnetoresistive RAM [MRAM] devices comprising components having three or more electrodes, e.g. transistors of the field-effect transistor [FET] type
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N50/00—Galvanomagnetic devices
- H10N50/01—Manufacture or treatment
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N50/00—Galvanomagnetic devices
- H10N50/10—Magnetoresistive devices
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N50/00—Galvanomagnetic devices
- H10N50/80—Constructional details
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
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- H10N50/80—Constructional details
- H10N50/85—Magnetic active materials
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N70/00—Solid-state devices having no potential barriers, and specially adapted for rectifying, amplifying, oscillating or switching
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N99/00—Subject matter not provided for in other groups of this subclass
Definitions
- the present disclosure relates to a semiconductor device including a nonvolatile memory element and a flip-flop circuit.
- CMOS Complementary Metal Oxide Semiconductor
- SRAM Static Random Access Memory
- Patent Document 1 an SRAM circuit including two P-type FETs and four N-type FETs is further combined with two N-type FETs and two magnetic tunnel junction elements.
- the occupied area becomes large, which hinders downsizing.
- a semiconductor device includes a first inverter circuit, a first connection line including a first node, a second inverter circuit, and a second connection line including a second node.
- a flip-flop circuit having a ring structure in which are connected in sequence, a control line, a first P-type transistor provided between the first node and the control line, and a first node and the control line
- a first nonvolatile memory element connected in series with the first P-type transistor, a second first conductivity-type transistor provided between the second node and the control line, And a second nonvolatile memory element provided between the second node and the control line and connected in series with the second P-type transistor.
- the first nonvolatile memory element includes a first magnetic tunnel junction element or a control line including a first pinned layer, a first tunnel barrier layer, and a first free layer arranged in order from a position close to the control line.
- the first variable resistance element includes a first electrode layer, a first insulating layer, and a first ion layer arranged in order from a close position, and the second nonvolatile memory element has a first order from a position close to the control line.
- a second magnetic tunnel junction element including a second pinned layer, a second tunnel barrier layer, and a second free layer, or a second electrode layer and a second insulating layer arranged in order from a position close to the control line And a second ionic layer.
- each nonvolatile memory element is a magnetic tunnel junction element or a resistance change element including a plurality of layers arranged in a predetermined order, data stored in the nonvolatile memory element from the flip-flop circuit is flip-flopped from the nonvolatile memory element. Data is prevented from being inverted when restoring to the circuit.
- Another semiconductor device includes: a first connection line including a first inverter circuit and a first node; a second connection line including a second inverter circuit and a second node; , A flip-flop circuit having an annular structure connected in order, a control line, a first first conductivity type transistor provided between the first node and the control line, a first node and a control line, A first non-volatile memory element connected in series with the first first conductivity type transistor, and a second first conductivity type transistor provided between the second node and the control line, , A second non-volatile memory element provided between the second node and the control line and connected in series with the second first conductivity type transistor, the first bit line, the first bit line, and the second A first second conductivity type transistor provided between the first connection line and the first connection line; Comprising a second bit line, and a second transistor of the second conductivity type provided between the second bit line and the second connecting line.
- the first inverter circuit includes a third first conductivity type transistor and a third second conductivity type transistor connected in parallel to each other, and the second inverter circuit includes a fourth first conductivity type connected in parallel to each other.
- Type transistor and a fourth second conductivity type transistor are examples of transistors
- the number of first conductivity type transistors and the number of second conductivity type transistors are balanced, which is advantageous for making the entire configuration compact.
- the semiconductor device as an embodiment of the present disclosure, high integration can be achieved.
- the effect of this indication is not limited to this, Any effect of the following description may be sufficient.
- FIG. 2 is a circuit diagram illustrating a configuration example of a semiconductor device according to a first embodiment of the present disclosure.
- FIG. FIG. 2 is a plan view illustrating a configuration example of the semiconductor device illustrated in FIG. 1.
- FIG. 2 is a cross-sectional view illustrating a configuration example of a main part of the semiconductor device illustrated in FIG. 1.
- FIG. 3 is a plan view illustrating one process in the method for manufacturing the semiconductor device illustrated in FIG. 1. It is sectional drawing showing the 1 process following FIG. 4A.
- FIG. 4B is a cross-sectional view illustrating a process following FIG. 4B.
- FIG. 4D is a cross-sectional view illustrating a process following FIG. 4C. It is sectional drawing showing the 1 process following FIG. 4D.
- FIG. 4E is sectional drawing showing the 1 process following FIG. 4E. It is sectional drawing showing the 1 process following FIG. 4F. It is sectional drawing showing the 1 process following FIG. 4G. It is sectional drawing showing the 1 process following FIG. 4H.
- FIG. 4D is a cross-sectional view illustrating a process following FIG. 4J.
- FIG. 3 is an explanatory diagram for explaining a method of storing data in a nonvolatile memory element in the semiconductor device shown in FIG. 1.
- FIG. 6 is another explanatory diagram for explaining a method of storing data in the nonvolatile memory element in the semiconductor device shown in FIG. 1.
- FIG. 3 is an explanatory diagram for describing a method of reading data stored in a nonvolatile memory element in the semiconductor device illustrated in FIG. 1.
- FIG. 11 is an explanatory diagram for explaining a method of storing data in a nonvolatile memory element in a semiconductor device as a reference example;
- FIG. 11 is another explanatory diagram for explaining a method of storing data in a nonvolatile memory element in a semiconductor device as a reference example.
- FIG. 11 is an explanatory diagram for describing a method of reading data stored in a nonvolatile memory element in a semiconductor device as a reference example; It is a circuit diagram showing the 1st modification of the semiconductor device concerning a 1st embodiment of this indication.
- FIG. 9B is a plan view illustrating a configuration example of the semiconductor device illustrated in FIG. 9A.
- FIG. 9B is a plan view illustrating a configuration example of the semiconductor device illustrated in FIG. 9A.
- FIG. 9B is a cross-sectional view illustrating a configuration example of a main part of the semiconductor device illustrated in FIG. 9A.
- 6 is a circuit diagram illustrating a configuration example of a semiconductor device according to a second embodiment of the present disclosure.
- FIG. FIG. 10B is a cross-sectional view illustrating a configuration example of a main part of the semiconductor device illustrated in FIG. 10A.
- FIG. 11 is an explanatory diagram for describing a method of storing data in a nonvolatile memory element in the semiconductor device illustrated in FIG. 10.
- FIG. 11 is another explanatory diagram for explaining a method of storing data in the nonvolatile memory element in the semiconductor device shown in FIG. 10.
- FIG. 10 is an explanatory diagram for describing a method of storing data in a nonvolatile memory element in the semiconductor device illustrated in FIG. 10.
- FIG. 11 is another explanatory diagram for explaining a method of storing data in the nonvolatile memory element in the semiconductor device shown in FIG. 10.
- FIG. 10 is a circuit diagram illustrating a modification of the semiconductor device according to the second embodiment of the present disclosure.
- FIG. 12B is a cross-sectional view illustrating a configuration example of a main part of the semiconductor device illustrated in FIG. 12A. It is sectional drawing showing the structural example of the semiconductor device which concerns on 3rd Embodiment of this indication.
- FIG. 14 is a plan view illustrating one process in a method for manufacturing the semiconductor device illustrated in FIG. 13. It is sectional drawing showing the 1 process following FIG. 14A. It is sectional drawing showing the 1 process following FIG. 14B. It is sectional drawing showing the principal part structural example of the semiconductor device which concerns on 4th Embodiment of this indication.
- FIG. 12B is a cross-sectional view illustrating a configuration example of a main part of the semiconductor device illustrated in FIG. 12A. It is sectional drawing showing the structural example of the semiconductor device which concerns on 3rd Embodiment of this indication.
- FIG. 14 is a plan view illustrating one process in
- FIG. 15B is a plan view illustrating a configuration example of a main part of the semiconductor device illustrated in FIG. 15A. It is sectional drawing showing the principal part structural example of the semiconductor device which concerns on 5th Embodiment of this indication. It is a circuit diagram showing the structural example of the semiconductor device as another modification.
- First embodiment semiconductor device having an MTJ element having a top pin structure
- First modified example of the first embodiment modified example in which the arrangement of the MTJ elements is changed
- Second Modification of First Embodiment Example in which writing to MTJ elements is performed collectively at an intermediate potential
- Second embodiment semiconductor device having a ReRAM element
- Modified example of the second embodiment modified example in which the arrangement of the ReRAM elements is changed
- Third embodiment semiconductor device adopting a bonding structure
- Fourth Embodiment semiconductor Device Employing Fin-FET
- Fifth embodiment semiconductor device adopting nanowire FET
- FIG. 1 shows a circuit configuration of the semiconductor device 1.
- FIG. 2 illustrates a planar configuration of the semiconductor device 1.
- FIG. 3 corresponds to a cross-sectional view in the direction of the arrow along the line III-III shown in FIG.
- the semiconductor device 1 includes a flip-flop circuit 10 having an inverter circuit 11 and an inverter circuit 12, a magnetic tunnel junction element (MTJ: Magnetic Tunnel Junctions) 21, and an MTJ 22 as a specific example of a second nonvolatile memory element.
- the MTJ 21 is a specific example of the “first nonvolatile memory element” of the present disclosure
- the MTJ 22 is a specific example of the “second nonvolatile memory element” of the present disclosure.
- the semiconductor device 1 further includes a word line WL, bit lines BL1 and BL2, a selection line SL, and a control line CTRL.
- the flip-flop circuit 10 has an annular structure in which an inverter circuit 11, a connection line CL1 including a node Q1, an inverter circuit 12, and a connection line CL2 including a node Q2 are sequentially connected.
- the inverter circuit 11 includes a P-type transistor PTr3 and an N-type transistor NTr1 connected in parallel to each other
- the inverter circuit 12 includes a P-type transistor PTr4 and an N-type transistor NTr2 connected in parallel to each other.
- the transistor here is, for example, a MOS (Metal Oxide Semiconductor) field effect transistor (FET).
- the gate electrode of the P-type transistor PTr3 and the gate electrode of the N-type transistor NTr1 are connected at the node Q3, and one of the source electrode or the drain electrode of the P-type transistor PTr3 is connected to the N-type transistor.
- One of the source electrode and the drain electrode of the transistor NTr1 is connected at the node Q4.
- the other of the source electrode and the drain electrode of the P-type transistor PTr3 is connected to an external power supply Vdd via the power supply terminal T1, and the other of the source electrode and the drain electrode of the N-type transistor NTr1 is grounded.
- the gate electrode of the P-type transistor PTr4 and the gate electrode of the N-type transistor NTr2 are connected at the node Q5, and one of the source electrode or drain electrode of the P-type transistor PTr4 and the N-type transistor NTr2 One of the source electrode and the drain electrode is connected at node Q6.
- the other of the source electrode and the drain electrode of the P-type transistor PTr4 is connected to the power supply Vdd via the power supply terminal T2, and the other of the source electrode and the drain electrode of the N-type transistor NTr2 is grounded.
- the nonvolatile memory unit 20 further includes a P-type transistor PTr1 provided between the node Q1 and the control line CTRL and connected in series with the MTJ21.
- the nonvolatile memory unit 20 further includes a P-type transistor PTr2 connected in series with the MTJ 22 between the node Q2 and the control line CTRL.
- the other end of the selection line SL1 whose one end is connected to the control unit 30 is connected to the gate electrode 422 (described later) of the P-type transistor PTr1.
- the other end of the selection line SL2 having one end connected to the control unit 30 is connected to the gate electrode 422 of the P-type transistor PTr2.
- Each of the MTJs 21 and 22 includes a pinned layer P, a tunnel barrier layer I, and a free layer F that are arranged in order from a position close to the control line CTRL.
- FIG. 3 shows a cross-sectional configuration in the vicinity of the nonvolatile memory unit 20 in the semiconductor device 1.
- the semiconductor device 1 has a stacked structure in which, for example, the layers LV1 to LV11 are sequentially stacked.
- an element isolation layer 411 for example, an element isolation layer 411, a channel region constituting a part of the P-type transistor PTr1 and a pair of diffusion layers 412A and 412B are formed on a substrate 41 made of a semiconductor material such as single crystal silicon. It is.
- the element isolation layer 411 is formed in the element isolation region, and the channel region and the pair of diffusion layers 412A and 412B are formed in the active region surrounded by the element isolation region.
- the element isolation layer 411 is an insulating film made of, for example, a silicon oxide film (SiO 2 ), and is formed by, for example, STI (Shallow Trench Isolation).
- the pair of diffusion layers 412A and 412B are formed by diffusing impurities in, for example, silicon.
- the hierarchy LV1 and the hierarchy LV2 may further include a flip-flop circuit 30.
- a gate insulating film 421 and a gate electrode 422 are sequentially stacked on the channel region, and a source electrode 423 and a drain electrode 424 are formed on the pair of diffusion layers 412A and 412B.
- the gate insulating film 421, the gate electrode 422, the source electrode 423, and the drain electrode 424 are embedded with the insulating layer Z2. However, the surface of the source electrode 423 and the surface of the drain electrode 424 are both exposed at the interface between the hierarchy LV2 and the hierarchy LV3.
- a metal layer M1E in contact with the surface of the source electrode 423 and a metal layer M1L in contact with the surface of the drain electrode 424 are formed.
- the periphery of the metal layers M1E and M1L is filled with an insulating layer Z3.
- a via V2 in contact with the surface of the metal layer M1L is formed.
- the periphery of the via V2 is filled with an insulating layer Z4.
- a metal layer M2 in contact with the upper surface of the via V2 is formed.
- the periphery of the metal layer M2 is filled with an insulating layer Z5.
- a via V3 in contact with the surface of the metal layer M2 is formed.
- the periphery of the via V3 is filled with an insulating layer Z6.
- a metal layer M3 in contact with the upper surface of the via V3 is formed.
- the periphery of the metal layer M3 is filled with an insulating layer Z7.
- a via V4 in contact with the surface of the metal layer M3 is formed.
- the periphery of the via V4 is filled with an insulating layer Z8.
- a metal layer M4 in contact with the upper surface of the via V4 is formed.
- the periphery of the metal layer M4 is filled with an insulating layer Z9.
- the MTJ 21 in contact with the surface of the metal layer M4 is formed in the layer LV10.
- the periphery of the MTJ 21 is filled with an insulating layer Z10.
- a metal layer M5 in contact with the upper surface of the MTJ 21 is formed.
- the periphery of the metal layer M5 is filled with an insulating layer Z11. However, the upper surface of the metal layer M5 is exposed.
- the gate insulating film 421 is made of, for example, a silicon oxide film.
- the gate electrode 422, the source electrode 423, the drain electrode 424, and the other metal layers M1 to M5 and the vias V2 to V4 are, for example, Cu (copper), Al (aluminum), Au (gold), Pt (platinum), It has a single-layer structure or a multi-layer structure made of a highly conductive nonmagnetic material such as Ti (titanium), Mo (molybdenum), Ta (tantalum), W (tungsten), TiN, TiW, WN, or silicide.
- the PVD method is used.
- the MTJs 21 and 22 store information by reversing the direction of magnetization of a free layer F as a storage layer to be described later by spin injection, for example, a spin injection magnetization reversal type storage element (STT-MTJ; Spin Transfer Torque-Magnetic Tunnel). Junctions).
- spin injection for example, a spin injection magnetization reversal type storage element (STT-MTJ; Spin Transfer Torque-Magnetic Tunnel). Junctions).
- STT-MTJ spin injection magnetization reversal type storage element
- Each of the MTJs 21 and 22 has a so-called top pin structure in which a pinned layer P, a tunnel barrier layer I, and a free layer F are stacked in order from the top, that is, from the top.
- a base layer and a protective layer may be further included so as to cover the surface of the free layer F and the surface of the pinned layer P.
- information is stored by changing the direction of the magnetization FJ of the free layer F having uniaxial anisotropy.
- information “0” or “1” is defined by the relative angle (parallel or antiparallel) between the magnetization FJ of the free layer F and the magnetization PJ of the pinned layer P.
- a low resistance state in which the magnetization FJ of the free layer F and the magnetization PJ of the pinned layer P are parallel is associated with information “0”, and the magnetization FJ of the free layer F and the magnetization PJ of the pinned layer P are antiparallel.
- the high resistance state can be associated with information “1”.
- the pinned layer P is a reference layer used as a reference for the storage information (the direction of the magnetization FJ) of the free layer F, and is composed of a ferromagnetic material having a magnetic moment in which the direction of the magnetization PJ is fixed in a direction perpendicular to the film surface, for example.
- the free layer F is a ferromagnetic layer having a magnetization FJ that freely changes in the direction perpendicular to the film surface in accordance with the inflowing spin-polarized current.
- the tunnel barrier layer I is an intermediate layer that functions to cut the magnetic coupling between the pinned layer P and the free layer F and to flow a tunnel current.
- recording information is stored by, for example, a perpendicular magnetization method. That is, by causing a spin-polarized current to flow from the free layer F to the pinned layer P, spin-polarized electrons are injected from the pinned layer P to the free layer F, and the direction of the magnetization PJ of the pinned layer P and the magnetization FJ of the free layer F The direction of is a parallel arrangement. On the other hand, by passing a spin-polarized current from the pinned layer P to the free layer F, spin-polarized electrons flow from the free layer F to the pinned layer P, and electrons having a spin parallel to the magnetization PJ of the pinned layer P are transmitted.
- a perpendicular magnetization method That is, by causing a spin-polarized current to flow from the free layer F to the pinned layer P, spin-polarized electrons are injected from the pinned layer P to the free layer F, and the direction of the magnetization PJ of the pinned layer P and the magnetization FJ of the free layer
- Electrons having spins antiparallel to the magnetization PJ of the pinned layer P are reflected.
- the direction of the magnetization PJ of the pinned layer P and the direction of the magnetization FJ of the free layer F are antiparallel.
- Constituent materials of the free layer F and the pinned layer P include simple elements of ferromagnetic elements such as Ni (nickel), Fe (iron), and Co (cobalt), and alloys containing these ferromagnetic elements (for example, Co—Fe, Co—Fe—Ni, Fe—Pt, Ni—Fe, etc.), and compounds obtained by adding nonmagnetic elements (eg, tantalum, boron, chromium, platinum, silicon, carbon, nitrogen, etc.) to these alloys (eg, Co— Fe-B etc.), oxides containing one or more of Co, Fe and Ni (eg ferrite such as Fe-MnO), a group of intermetallic compounds called half-metallic ferromagnetic materials (eg NiMnSb, Co 2 MnGe) , Co 2 MnSi, Heusler alloys such as Co 2 CrAl), and other oxides (e.g.
- ferromagnetic elements such as Ni (nickel), Fe (iron), and Co (co
- the free layer F and the pinned layer P may have a single layer structure, or may have a multilayer structure in which a plurality of layers made of the same material or different materials are stacked.
- the constituent material of the free layer F and the pinned layer P may be polycrystalline, single crystal, or amorphous.
- the pinned layer may have a laminated ferri structure (a laminated structure having antiferromagnetic coupling, which is also called synthetic antiferromagnetic coupling (SAF)), or a magnetostatic coupling structure. The structure which has this may be sufficient.
- An antiferromagnetic material layer may be disposed adjacent to the pinned layer. This is because by arranging an antiferromagnetic material layer adjacent to the pinned layer P, a strong unidirectional magnetic anisotropy can be obtained by exchange interaction between these two layers.
- the laminated ferri structure is, for example, a three-layer structure of magnetic layer / ruthenium (Ru) layer / magnetic layer (specifically, for example, three-layer structure of CoFe / Ru / CoFe, three layers of CoFeB / Ru / CoFeB) And the interlayer exchange coupling between the two magnetic layers is antiferromagnetic or ferromagnetic depending on the thickness of the ruthenium layer.
- a magnetostatic coupling structure a structure in which antiferromagnetic coupling is obtained by the leakage magnetic field from the end face of the magnetic layer in the two magnetic layers.
- Examples of the material constituting the antiferromagnetic material layer include iron-manganese alloys, nickel-manganese alloys, platinum-manganese alloys, iridium-manganese alloys, rhodium-manganese alloys, cobalt oxides, and nickel oxides.
- a base film made of Ta, Cr, Ru, Ti or the like is formed between the first wiring (or the second wiring) and the antiferromagnetic material layer in order to improve the crystallinity of the antiferromagnetic material layer. May be.
- the material constituting the tunnel barrier layer I includes AlOx (aluminum oxide), AlN (aluminum nitride), MgO (magnesium oxide), magnesium nitride, silicon oxide, silicon nitride, TiO 2 , Cr 2 O. 3 , insulating materials such as Ge, NiO, CdOx, HfO 2 , Ta 2 O 5 , BN or ZnS.
- the tunnel barrier layer I is obtained, for example, by oxidizing or nitriding a metal film formed by a sputtering method.
- a method of oxidizing aluminum or magnesium formed by sputtering in the atmosphere, or aluminum or magnesium formed by sputtering is plasma.
- Such as the method of forming a film may be mentioned a lOx or MgO by a sputtering method.
- These layers are formed by, for example, a chemical vapor deposition method typified by a physical vapor deposition method (PVD method) exemplified by a sputtering method, an ion beam deposition method, a vacuum evaporation method, or an ALD (Atomic Layer Deposition) method. (CVD method).
- PVD method physical vapor deposition method
- ion beam deposition method e.g., a vacuum evaporation method
- ALD Atomic Layer Deposition
- the semiconductor device 1 further includes an N-type transistor NTr3 provided between the bit line BL1 and the connection line SL1, and an N-type transistor NTr4 provided between the bit line BL2 and the connection line SL2.
- the gate electrode of the N-type transistor NTr3 and the gate electrode of the N-type transistor NTr4 are both connected to the common word line WL.
- the four P-type transistors PTr1 to PTr4 have gate electrodes 422A to 422D, respectively, and the four N-type transistors NTr1 to NTr4 have gate electrodes 422E to 422H, respectively.
- These eight gate electrodes 422A to 422H all extend along the same direction (Y-axis direction).
- the gate electrodes 422A to 422D are arranged in the same N-type well region NWEL so as to be aligned in the X-axis direction orthogonal to the extending direction (Y-axis direction).
- the gate electrode 422B, the gate electrode 422C, the gate electrode 422D, and the gate electrode 422A are arranged in this order from the left side to the right side in FIG.
- the gate electrodes 422E to 422H are arranged so as to be aligned in the X-axis direction in the same P-type well region PWEL.
- the gate electrode 422H, the gate electrode 422E, the gate electrode 422F, and the gate electrode 422G are arranged in this order from the left side to the right side in FIG.
- N-type well region NWEL and P-type well region PWEL are arranged adjacent to each other in the Y-axis direction.
- the gate electrode 422H is disposed on the extension of the gate electrode 422B
- the gate electrode 422E is disposed on the extension of the gate electrode 422C
- the gate electrode 422F is disposed on the extension of the gate electrode 422D
- the extension of the gate electrode 422A A gate electrode 422G is disposed on the substrate.
- the power supply terminals T1 and T2 connected to the external power supply Vdd are provided at positions sandwiched between four gate electrodes 422A to 422D aligned in the X-axis direction.
- FIG. 2 illustrates an example in which the gate electrode 422C and the gate electrode 422D disposed in the center are provided in a region sandwiched between them.
- the ground terminal GND is provided at a position sandwiched between four gate electrodes 422E to 422H aligned in the X-axis direction.
- FIG. 2 shows an example in which the gate electrode 422E and the gate electrode 422F arranged in the center are provided in a region.
- MTJs 21 and 22 are provided outside the region where the eight gate electrodes 422A to 422H are formed. That is, the gate electrodes 422A to 422H are arranged between the MTJ21 and the MTJ22 in the X-axis direction.
- a common selection line SL may be provided instead of providing the selection line SL1 and the selection line SL2 separately.
- the selection line SL extends along the X-axis direction as shown in FIG. 2, and is connected to both the gate electrode 422A and the gate electrode 422B.
- the word line WL extends along the X-axis direction and is connected to both the gate electrode 422G and the gate electrode 422H.
- the control line CTRL is provided so as to include a portion CTRL1 extending along the Y-axis direction so as to overlap with MTJ21 and a portion CTRL2 extending along the Y-axis direction so as to overlap MTJ22. ing.
- two bit lines BL1 and BL2 extending along the Y-axis direction are provided between the portion CTRL1 and the portion CTRL2 of the control line CTRL.
- FIGS. 4A to 4K are plan views showing one process in the method for manufacturing the semiconductor device 1.
- FIG. 4A to 4K are plan views showing one process in the method for manufacturing the semiconductor device 1.
- P-type transistors PTr1-PTr4 and N-type transistors NTr1-NTr4 are formed on a substrate 41.
- a substrate 41 on which an element isolation layer 411 is formed so as to surround the N-type well region NWEL and the P-type well region PWEL is prepared.
- diffusion layers 412 are formed in part of the N-type well region NWEL and part of the P-type well region PWEL, respectively.
- source electrodes 423A to 423D and drain electrodes 424A to 424D in the P-type transistors PTr1 to PTr4 and source electrodes 423E to 423H and drain electrodes 424E to 424H in the N-type transistors NTr1 to NTr4 are formed on the diffusion layer 412.
- gate electrodes 422 (422A to 422H) are formed on the substrate 41 in the channel region between the source electrode 423 and the drain electrode 424 with the gate insulating film 421 interposed therebetween. Note that, as illustrated in FIG. 4A, some of the source electrodes 423 and the drain electrodes 424 may be shared.
- a via V1A is formed so as to be in contact with both the upper surface of the gate electrode 422C and the upper surface of the gate electrode 422E
- a via V1B is formed so as to be in contact with both the upper surface of the gate electrode 422D and the upper surface of the gate electrode 422F.
- a via V1C is formed on one end of the gate electrode 422A
- a via V1D is formed on one end of the gate electrode 422B
- a via V1E is formed on one end of the gate electrode 422G
- a via V1F is formed on one end of the gate electrode 422H.
- metal layers M1A to M1P are formed at predetermined positions. Specifically, the metal layer M1A is formed over the source electrode 423C (423D), the metal layer M1B is formed over the drain electrode 424E (424F), the metal layer M1C is formed over the via V1B, and the metal layer M1D is formed.
- a metal layer M1E is formed on the via V1A so as to connect the source electrode 423A (drain electrode 424D) and the source electrode 423F (drain electrode 424G), and the metal layer M1F is formed on the source electrode 423B (drain electrode 424C) and the source.
- the electrode 423E (source electrode 423H) is formed so as to be connected, the metal layer M1G is formed on the via V1C, the metal layer M1H is formed on the via V1E, and the metal layer M1J is formed on the via V1D.
- M1K is formed on via V1F, metal layer M1L is formed on drain electrode 424A, and metal layer M1M is formed on source electrode 423G.
- the metal layer M1N is formed on the drain electrode 424B, to form the metal layer M1P on the drain electrode 424h.
- vias V2A to V2P are formed on the metal layers M1A to M1P, respectively.
- the metal layer M2A is formed on the via V2A
- the metal layer M2B is formed on the via V2B
- the metal layer M2C is formed so as to connect the via V2C and the via V2F.
- the metal layer M2D is formed so as to connect the via V2D and the via V2E
- the metal layer M2E is formed on the via V2G
- the metal layer M2F is formed on the via V2H
- the metal layer M2G is formed on the via V2J.
- the metal layer M2H is formed on the via V2L
- the metal layer M2J is formed on the via V2L
- the metal layer M2K is formed on the via V2M
- the metal layer M2L is formed on the via V2N.
- a metal layer M2M is formed on the via V2P.
- the via V3A is formed on the metal layer M2A
- the via V3B is formed on the metal layer M2B
- the via V3E is formed on the metal layer M2E
- the via V3F is formed.
- the via V3G is formed on the metal layer M2G
- the via V3H is formed on the metal layer M2H
- the via V3J is formed on the metal layer M2J
- the via V3K is formed on the metal layer
- a via V3L is formed on the metal layer M2L
- a via V3M is formed on the metal layer M2M.
- a metal layer M3A extending in the Y-axis direction is formed so as to be in contact with the upper surface of the via V3A.
- This metal layer M3A constitutes a part of a power supply line connected to an external power supply Vdd.
- a metal layer M3B extending in the Y-axis direction is formed so as to be in contact with the upper surface of the via V3B.
- This metal layer M3B constitutes a part of the ground wire to be grounded.
- metal layers M3E to M3M are formed so as to be in contact with the upper surfaces of the vias V3E to V3M, respectively.
- vias V4E to V4M are formed on the metal layers M3E to M1M, respectively.
- the metal layer M4A is formed so as to connect the via V4E and the via V4G
- the metal layer M4B is formed so as to connect the via V4F and the via V4H
- metal layers M4J to M4M are formed so as to be in contact with the upper surfaces of the vias V4J to V4M, respectively.
- the metal layer M4A corresponds to the selection lines SL1 and SL2
- the metal layer M4B corresponds to the word line WL.
- MTJ21 is formed on metal layer M4J
- MTJ22 is formed on metal layer M4L
- via V5K is formed on metal layer M4K
- via V5M is formed on the metal layer. Form on M4M.
- a metal layer M5A is formed on MTJ22, a metal layer M5B is formed on via V5M, a metal layer M5C is formed on via V5K, and MTJ21 is formed.
- a metal layer M5D is formed.
- the metal layer M5B corresponds to the bit line BL2
- the metal layer M5C corresponds to the bit line BL1
- the metal layer M5A and the metal layer M5D correspond to the control line CTRL.
- the semiconductor device 1 is completed.
- the potential of the bit line BL1 and the potential of the bit line BL2 are made equal to be in a floating state (floating state), while the word line WL is set to a high level and the N-type transistor NTr3 and the N-type transistor NTr4 are made conductive.
- the data written in the flip-flop circuit 10 can be read out to the bit line BL1 and the bit line BL2. However, if the power is cut off, the data written in the flip-flop circuit 10 is lost. Therefore, the data written in the flip-flop circuit 10 is permanently held in the nonvolatile storage unit 20.
- L L
- the components in the conductive state are drawn with solid lines, and the components in the cut-off state are drawn with broken lines.
- the potential is L ′′.
- a current I1 flows from the node Q7 to the control line CTRL via the P-type transistors PTr1 and MTJ21 sequentially.
- the MTJ 21 can be brought into a low resistance state indicating the resistance value R L.
- the data written in the flip-flop circuit 10 can be stored in the nonvolatile storage unit 20 in a nonvolatile manner. That is, after that, even when the voltage application from the power supply Vdd is cut off and the data written in the flip-flop circuit 10 is lost, the low resistance state of the MTJ 21 and the high resistance state of the MTJ 22 are maintained.
- the data is stored in the MTJ 22 after the data is stored in the MTJ 21 first. However, the order may be changed. Further, although MTJ21 is set to a low resistance state and MTJ22 is set to a high resistance state, MTJ21 may be set to a high resistance state and MTJ22 may be set to a low resistance state.
- the MTJ 21 in the low resistance state rises before the MTJ 22 in the high resistance state. That is, as shown in FIG. 6, after the power is turned on, current I4 and current I3 flow from the power supply to nodes Q7 and Q8, respectively.
- the nonvolatile memory unit 20 is provided between the flip-flop circuit 10 and the control line CTRL.
- the nonvolatile memory unit 20 includes P-type transistors PTr1 and MTJ21 connected in series with each other and P-type transistors PTr2 and MTJ22 connected in series with each other. Therefore, the number of P-type transistors and N-type transistors in the semiconductor device 1 is the same, and the plurality of P-type transistors and N-type transistors can be regularly arranged in a narrower region. Therefore, the overall configuration can be reduced in size.
- Each of MTJ21 and MTJ22 has a so-called top pin structure in which a pinned layer P, a tunnel barrier layer I, and a free layer F are stacked (arranged) in a position close to the control line CTRL, that is, from the top. Yes. Therefore, the current characteristics of the P-type transistors PTr1 and PTr2 and the current characteristics of the MTJs 21 and 22 coincide with each other, and the problem of the asymmetry of the write current with respect to the MTJs 21 and 22 is solved.
- the P-type transistors PTr1 and PTr2 have characteristics that a larger current flows in the direction from the control line CTRL to the nodes Q1 and Q2, and that a large current does not flow in the direction from the nodes Q1 and Q2 to the control line CTRL. .
- a relatively small write current is sufficient when switching from the high resistance state to the low resistance state, but a relatively large write current is required when switching from the low resistance state to the high resistance state.
- the direction in which a larger current flows in the P-type transistors PTr1 and PTr2 coincides with the direction in which a relatively large write current is required in the MTJs 21 and 22.
- the MTJ 21 and 22 have a structure in which the pinned layer P, the tunnel barrier layer I, and the free layer F are stacked in order from a position close to the control line CTRL. Also play. In other words, when data stored in the MTJ 21 and MTJ 22 from the flip-flop circuit 10 is read again from the MTJ 21 and MTJ 22 to the flip-flop circuit 10, data inversion is prevented. This will be described in detail with reference to FIGS. 7A and 7B and a reference example of FIG.
- a current I1 flows from the node Q7 to the control line CTRL through the P-type transistor PTr1 and the MTJ 121 sequentially.
- the MTJ 121 can be brought into a high resistance state indicating the resistance value R H.
- a current I2 flows from the control line CTRL to the node Q8 via the MTJ 122 and the P-type transistor PTr2 sequentially.
- the MTJ 122 can be brought into a low resistance state indicating the resistance value R L.
- Data stored in the nonvolatile storage unit 20 in a nonvolatile manner can be read back (restored) into the flip-flop circuit 10 as follows.
- a method for reading data stored in the MTJ 121 and the MTJ 122 to the flip-flop circuit 10 will be described with reference to FIG.
- MTJ 121 is in a high resistance state indicating resistance value R H
- MTJ 122 is in a low resistance state indicating resistance value R L.
- the MTJ 122 in the low resistance state rises before the MTJ 121 in the high resistance state. That is, as shown in FIG. 8, after the power is turned on, current I4 and current I3 flow from the power supply to nodes Q7 and Q8, respectively.
- the current I5 flowing from the node Q7 to the control line CTRL is smaller than the current I6 flowing from the node Q8 to the control line CTRL (I5 ⁇ I6).
- the MTJs 21 and 22 having the predetermined stacking order are provided as described above, the data stored in the nonvolatile storage unit 20 from the flip-flop circuit 10 is stored in the nonvolatile storage unit.
- data inversion is prevented and accurate data reproduction is possible.
- FIG. 9A is a circuit diagram of a semiconductor device 1A that is a first modification of the semiconductor device 1 described above
- FIG. 9B is a plan view of the semiconductor device 1A
- FIG. 9C is a cross-sectional view of the main part of the semiconductor device 1A.
- FIG. 9B shows a hierarchy including the gate electrode 422 and the like, and wirings in the other hierarchy are not shown by broken lines or thick solid lines.
- FIG. 9C shows a cross section in the direction of the arrow along the IXC-IXC cutting line shown in FIG. 9B.
- the MTJ21 is provided between the P-type transistor PTr1 and the control line CTRL, and the MTJ22 is provided between the P-type transistor PTr2 and the control line CTRL.
- MTJ21 is provided between P-type transistor PTr1 and node Q1
- MTJ22 is provided between P-type transistor PTr2 and node Q2.
- the MTJ 21 and the MTJ 22 have the pinned layer P, the tunnel barrier layer I, and the free layer F stacked (in a line) in order from a position close to the control line CTRL. For this reason, the semiconductor device 1 ⁇ / b> A can obtain the same effects as the semiconductor device 1.
- the MTJ 21 and MTJ 22 in the semiconductor device 1A have a cross-sectional structure in which a tunnel barrier layer I as an intermediate layer and a free layer F as an upper layer are sequentially formed on a pinned layer P as a lower layer as shown in FIG. 9C. It is preferable to have a stacked so-called bottom pin structure. This is because the length of the wiring connecting the MTJ 21 and 22 and the nodes Q1 and Q2 and the wiring connecting the MTJ 21 and 22 and the P-type transistors PTr1 and PTr2 is shortened, which is advantageous for downsizing the entire configuration.
- the MTJ 21 when data is stored in the nonvolatile storage unit 20, the MTJ 21 can be in a low resistance state and the MTJ 22 can be in a high resistance state. That is, writing to the MTJ 21 and the MTJ 22 can be performed collectively.
- data inversion when data is read from the nonvolatile storage unit 20, data inversion is prevented, and the state before the power is shut off is accurately reproduced.
- FIG. 10A shows a circuit configuration of the semiconductor device 2.
- FIG. 10B illustrates a cross-sectional configuration of the main part of the semiconductor device 2.
- the MTJs 21 and 22 are used as the nonvolatile memory elements.
- the variable resistance elements 61 and 62 having a laminated structure of an ion layer, an insulating layer, and an electrode layer are used instead of the MTJs 21 and 22. Except for this point, the semiconductor device 2 has the same configuration as that of the semiconductor device 1. In the following description, components corresponding to those of the semiconductor device 1 of the first embodiment will be described with the same reference numerals.
- each of the resistance change elements 61 and 62 includes an electrode layer 65, an insulating layer 64, and an ion layer 63 that are sequentially stacked from a position close to the control line CTRL.
- the variable resistance elements 61 and 62 in the semiconductor device 2 have a cross-sectional structure in which an insulating layer 64 and an electrode layer 65 are sequentially laminated on an ion layer 63 as a lower layer as shown in FIG. 10B. It is good to have.
- the ion layer 63 is a layer made of, for example, CuTe and supplies ions (for example, Cu 2+) that move to the electrode layer 65 through the insulating layer 64.
- the resistance change elements 61 and 62 show a resistance change due to the movement amount of the ions.
- FIGS. 11A and 11B A method of storing data written in the flip-flop circuit 10 in the resistance change element 61 and the resistance change element 62 in the nonvolatile storage unit 20 will be described with reference to FIGS. 11A and 11B.
- the control unit 30 performs writing to the nonvolatile storage unit 20 by performing the following operation before cutting off the voltage application from the power supply Vdd.
- the components in the conductive state are drawn with solid lines, and the components in the cut-off state are drawn with broken lines.
- the potential is L ′′.
- a current I1 flows from the node Q7 to the control line CTRL via the P-type transistor PTr1 and the resistance change element 61 sequentially.
- the resistance change element 61 can be brought into a low resistance state indicating the resistance value R L.
- current I2 flows from control line CTRL to node Q8 via resistance change element 62 and P-type transistor PTr2 sequentially.
- the resistance change element 62 can be brought into a high resistance state indicating a resistance value R H (> R L ).
- the current I2 flows in the order of the electrode layer 65, the insulating layer 64, and the ion layer 63, that is, copper ions Cu 2+ move away from the electrode layer 65 toward the ion layer 63. .
- the data written in the flip-flop circuit 10 can be stored in the nonvolatile storage unit 20 in the nonvolatile manner also in the semiconductor device 2. Similarly to the semiconductor device 1, in the semiconductor device 2, data stored in the nonvolatile storage unit 20 in a nonvolatile manner can be read (restored) again into the flip-flop circuit 10.
- each of the resistance change element 61 and the resistance change element 62 has a structure in which the electrode layer 65, the insulating layer 64, and the ion layer 63 are stacked (arranged) in order from a position close to the control line CTRL. For this reason, when data stored in the MTJ 21 and MTJ 22 from the flip-flop circuit 10 is read again from the MTJ 21 and MTJ 22 to the flip-flop circuit 10, data inversion is prevented. Therefore, high operational reliability is ensured.
- FIG. 12A is a circuit diagram of a semiconductor device 2A which is a modification of the semiconductor device 2 described above.
- FIG. 12B shows a cross-sectional configuration of the main part of the semiconductor device 2A.
- the resistance change element 61 is provided between the P-type transistor PTr1 and the control line CTRL
- the resistance change element 62 is provided between the P-type transistor PTr2 and the control line CTRL.
- the resistance change element 61 is provided between the P-type transistor PTr1 and the node Q1
- the resistance change element 62 is provided between the P-type transistor PTr2 and the node Q2.
- the resistance change element 61 and the resistance change element 62 have the electrode layer 65, the insulating layer 64, and the ion layer 63 stacked (arranged) in order from a position close to the control line CTRL. It has a structure.
- the semiconductor device 2 ⁇ / b> A can obtain the same effects as the semiconductor device 2.
- the variable resistance elements 61 and 62 in the semiconductor device 2A have a cross-sectional structure in which an insulating layer 64 and an ion layer 63 are sequentially stacked on an electrode layer 65 as a lower layer as shown in FIG. 12B. It is good to have.
- FIG. 13 illustrates a cross-sectional configuration of a main part of the semiconductor device 3 and illustrates a portion corresponding to FIG. 3 that represents the semiconductor device 1 of the first embodiment.
- the semiconductor device 3 has a bonded structure in which, for example, a substrate unit U1 including a P-type transistor PTr1 and a P-type transistor PTr2 and a substrate unit U2 including MTJ21 and MTJ22 are bonded.
- a substrate unit U1 including a P-type transistor PTr1 and a P-type transistor PTr2 and a substrate unit U2 including MTJ21 and MTJ22 are bonded.
- the bonding surface BS1 in the substrate unit U1 and the bonding surface BS2 in the substrate unit U2 are bonded to face each other.
- the bonding surface BS1 and the bonding surface BS2 are bonded via an insulating thin film ZZ formed by, for example, an atomic layer deposition method (hereinafter referred to as ALD method).
- ALD method atomic layer deposition method
- the bonding surface BS1 and the bonding surface BS2 may be in direct contact without interposing the insulating thin film ZZ.
- the P-type transistors PTr2 and MTJ22 are omitted, and the cross section including the P-type transistors PTr1 and MTJ21 is illustrated, but the configuration of the cross section including the P-type transistors PTr2 and MTJ22 is the same as this. Accordingly, a cross section including the P-type transistors PTr1 and MTJ21 will be described below.
- the substrate unit U1 is obtained by sequentially forming an element formation layer 42 including a P-type transistor PTr1 and a wiring layer 43 on a substrate 41 made of a semiconductor material such as single crystal silicon.
- the surface of the wiring layer 43 constitutes the bonding surface BS1.
- the element formation layer 42 may further include a flip-flop circuit 30 in addition to the selection lines SL1 and SL2.
- a channel region and a pair of diffusion layers 412A and 412B constituting a part of the P-type transistor PTr1 are formed in an element region surrounded by the element isolation layer 411.
- the element isolation layer 411 is an insulating film made of, for example, a silicon oxide film (SiO 2 ), and is formed by, for example, STI (Shallow Trench Isolation).
- the pair of diffusion layers 412A and 412B are formed by diffusing impurities in, for example, silicon.
- a gate insulating film 421 and a gate electrode 422 are sequentially stacked on the channel region, and a source electrode 423 and a drain electrode 424 are formed on the pair of diffusion layers 412A and 412B.
- the gate insulating film 421, the gate electrode 422, the source electrode 423, and the drain electrode 424 are embedded with an insulating layer 425. However, the surface of the source electrode 423 and the surface of the drain electrode 424 are both exposed at the interface between the element formation layer 42 and the wiring layer 43.
- the wiring layer 43 includes a wiring 431 in contact with the surface of the source electrode 423, a wiring 432 in contact with the surface of the drain electrode 424, a pad 433, and a connection portion 434 that connects the wiring 432 and the pad 433.
- the wiring 431, the wiring 432, the pad 433, and the connection portion 434 are embedded with insulating layers 435 and 436. However, the pad 433 has a surface exposed to the joint surface BS1.
- the gate insulating film 421 is made of, for example, a silicon oxide film.
- the gate electrode 422, the source electrode 423, the drain electrode 424, the wirings 431 and 432, the pad 433, and the connection portion 434 are, for example, Cu (copper), Al (aluminum), Au (gold), Pt (platinum), Ti ( Titanium), Mo (molybdenum), Ta (tantalum), W (tungsten), TiN, TiW, WN, or a single layer structure or a multilayer structure made of a highly conductive nonmagnetic material such as silicide.
- PVD such as sputtering Formed by law.
- the substrate unit U2 is formed by sequentially forming a wiring layer 52 including a control line CTRL, an element formation layer 53 including MTJ21, and a wiring layer 54 on a substrate 51 made of, for example, an insulating material.
- the surface of the wiring layer 54 constitutes the bonding surface BS2.
- the wiring layer 52 is configured such that a wiring 521 such as a control line CTRL and a connection portion 522 including a back surface connected to the wiring 521 are embedded in the insulating layers 523A to 523C.
- the surface of the connection portion 522 is exposed at the interface between the wiring layer 52 and the element formation layer 53.
- the element formation layer 53 includes a wiring 531 including a back surface in contact with the surface of the connection portion 522 and an MTJ 21 including a back surface in contact with the surface of the wiring 531.
- the wiring 531 and the MTJ 21 are embedded with an insulating layer 532.
- the wiring layer 54 includes a pad 541 having a surface exposed to the bonding surface BS2, and a connection portion 542 that connects the MTJ 21 and the pad 541.
- the back surface of the connection part 542 is in contact with the surface of the MTJ 21.
- the pad 541 and the connection portion 542 are embedded with an insulating layer 543.
- the pad 541 has a surface exposed to the joint surface BS2.
- Cu copper
- Al aluminum
- Au gold
- Pt platinum
- Ti titanium
- Mo mobdenum
- It has a single layer structure or a multilayer structure made of a highly conductive nonmagnetic material such as (tantalum), W (tungsten), TiN, TiW, WN, or silicide, and is formed by, for example, a PVD method such as a sputtering method.
- a highly conductive nonmagnetic material such as (tantalum), W (tungsten), TiN, TiW, WN, or silicide
- FIGS. 14A to 14C are plan views showing one process in the method for manufacturing the semiconductor device 3, respectively.
- an element formation layer 42 including P-type transistors PTr1 to PTr4 and N-type transistors NTr1 to NTr4 and a wiring layer 43 are sequentially formed on a substrate 41 to obtain a substrate unit U1.
- an insulating thin film ZZ1 is formed so as to cover the bonding surface BS1 using, for example, an ALD method.
- a first reactant and a second reactant containing constituent elements of a thin film to be formed are prepared.
- the film forming process there are a first process in which a gas containing a first reactant is supplied and subjected to an adsorption reaction on the substrate, and a second process in which a gas containing a second reactant is supplied and subjected to an adsorption reaction.
- an inert gas is allowed to flow to purge unadsorbed reactants.
- one atomic layer is deposited and repeated to form a film with a desired film thickness. Note that either the first step or the second step may be performed first.
- the insulating thin film ZZ1 is made of an oxide film (SiO 2 , HfO 2, etc.)
- the first reactant is an Si-containing reactant or an Hf-containing reactant
- the second reactant is an O-containing reactant.
- the insulating thin film ZZ1 made of SiO 2 or HfO 2 is formed by alternately repeating the process of supplying these reactants and causing an adsorption reaction.
- the Si-containing reactant a substance that can be supplied in a gaseous state, such as silane (SiH 4 ) or dichlorosilane (H 2 SiCl 2 ), is used. Tetrakisdimethylaminohafnium (Hf [N (CH 3 ) 2 ] 4 etc. is used as the Hf-containing reactant, and water vapor gas, ozone gas, etc. are used as the O-containing reactant.
- silane SiH 4
- dichlorosilane H 2 SiCl 2
- Tetrakisdimethylaminohafnium (Hf [N (CH 3 ) 2 ] 4 etc. is used as the Hf-containing reactant
- water vapor gas, ozone gas, etc. are used as the O-containing reactant.
- the first reactant is an Si-containing reactant and the second reactant is an N-containing reactant.
- the insulating thin film ZZ1 made of a nitride film (SiN) is formed.
- nitrogen gas or ammonia gas is used as the N-containing reactant.
- steam gas, ozone gas, or the like is used as the O-containing reactant.
- an extremely thin and homogeneous insulating thin film ZZ1 can be formed so as to cover the bonding surface BS1.
- the substrate unit U2 is formed on the substrate 51 by sequentially forming the wiring layer 52 including the control line CTRL, the element forming layer 53 including the MTJ 21, and the wiring layer 54. obtain.
- the insulating thin film ZZ2 is formed so as to cover the bonding surface BS2 using, for example, the above-described ALD method.
- the substrate unit U1 and the substrate unit U2 are bonded together.
- the substrate unit U2 is turned upside down so that the insulating thin film ZZ1 of the substrate unit U1 and the insulating thin film ZZ2 of the substrate unit U2 face each other.
- alignment in the in-plane direction is performed so that the pad 433 and the pad 541 face each other.
- the insulating thin film ZZ1 and the insulating thin film ZZ2 are brought into contact with each other, and heat treatment is performed while keeping the contact.
- the heat treatment is held at 200 ° C. to 600 ° C. for about 1 to 5 hours. Such heat treatment may be performed in a pressurized atmosphere. Alternatively, the pad 433 and the pad 541 may be urged so as to press each other. Thereby, the insulating thin film ZZ1 and the insulating thin film ZZ2 are joined to form an integrated insulating thin film ZZ. As a result, the bonding of the substrate unit U1 and the substrate unit U2 is completed.
- the insulating thin film ZZ1 and the insulating thin film ZZ2 may be made of the same material or different materials.
- Such a semiconductor device 3 can also exhibit the same function as the semiconductor device 1 of the first embodiment.
- the semiconductor device 3 when the MTJs 21 and 22 are formed on the substrate 51 in the substrate unit U2, the pinned layer P, the tunnel barrier layer I, and the free layer F can be stacked in this order. Therefore, compared with the case where the free layer F, the pinned layer P, and the tunnel barrier layer I are laminated in this order, the MTJs 21 and 22 having excellent responsiveness and operational stability can be obtained relatively easily.
- FIG. 15A illustrates a cross-sectional configuration of the main part of the semiconductor device 4
- FIG. 15B illustrates a plan configuration of the main part of the semiconductor device 4.
- FIG. 15A corresponds to a cross-sectional view in the arrow direction along the XVA-XVA cutting line shown in FIG. 15B.
- Fin-FET fin field effect transistor
- Semiconductor device 4 uses Fin-FET 80 as P-type transistors PTr1-PTr4 and N-type transistors NTr1-NTr4. Except for this point, the semiconductor device 4 has the same configuration as that of the semiconductor device 1.
- the Fin-FET 80 is provided in the first layer LV21 on the substrate 41 including the element isolation layer 411, for example.
- the Fin-FET 80 includes, for example, a fin 81 made of Si (silicon), a gate electrode 82G, a source electrode 82S, and a drain electrode 82D, and is embedded in the insulating film Z11.
- the fins 81 have a flat plate shape, and a plurality of the fins 81 are erected so that the back surface thereof is in contact with the substrate 41 made of a semiconductor material.
- the plurality of fins 81 extend in the X-axis direction and are arranged in the Y-axis direction.
- the gate electrode 82G, the source electrode 82S, and the drain electrode 82D are all extended so as to straddle the fin 81 in the Y-axis direction intersecting with the extending direction of the fin 81.
- the gate electrode 82G, the source electrode 82S, and the drain electrode 82D all cover a surface other than the back surface of the fin 81, that is, a surface other than the surface where the fin 81 contacts the substrate 41.
- the second hierarchy LV22 is formed on the second hierarchy LV21.
- contact layers 83G, 83S, and 83D connected to the gate electrode 82G, the source electrode 82S, and the drain electrode 82D, respectively, are provided.
- the insulating layer Z12 occupies the periphery of the contact layers 83G, 83S, 83D.
- the Fin-FET 80 By using such a Fin-FET 80, it is possible to suppress short channel characteristics as compared with a planar transistor on a bulk substrate.
- the gate electrode 82G, the source electrode 82S, and the drain electrode 82D are regularly arranged. Therefore, the P-type transistors PTr1-PTr4 and the N-type transistors NTr1-NTr4 can be formed in a narrower region, and a highly integrated semiconductor device 4 can be obtained.
- FIG. 16 illustrates a cross-sectional configuration of the semiconductor device 5 according to the fifth embodiment of the present disclosure.
- the semiconductor device 5 differs from the semiconductor device 4 of the fourth embodiment in that it includes a transistor 80A that is a nano-wire FET instead of the Fin-FET 80.
- the insulating film Z ⁇ b> 10 is provided between the back surface 81 ⁇ / b> B of the fin 81 and the substrate 41.
- an electrode 84 is embedded in a part of the substrate 41.
- the gate electrode 84 is buried at a position facing the gate electrode 82G across the insulating film Z10.
- Other aspects are the same as those of the semiconductor device 4.
- Such a semiconductor device 5 can also be highly integrated.
- the flip-flop circuit of the present disclosure is not limited to the one described in the above embodiment and the like.
- a master-slave flip-flop circuit 70 having D latch circuits 71 and 72 can be employed as in the semiconductor device 6 shown in FIG.
- the positions of the MTJ 21 and the P-type transistor PTr1 may be interchanged, or the positions of the MTJ 22 and the P-type transistor PTr2 may be interchanged.
- the resistance change elements 61 and 62 described in the second embodiment may be employed.
- the present disclosure does not need to include all of the components described in the above embodiment, and may further include other components.
- each component described in the above embodiment is not limited, and other materials, thickness, and forming method may be used.
- a flip-flop having a ring structure in which a first inverter circuit, a first connection line including a first node, a second inverter circuit, and a second connection line including a second node are sequentially connected.
- Circuit, Control lines A first P-type transistor provided between the first node and the control line;
- a first nonvolatile memory element provided between the first node and the control line and connected in series with the first P-type transistor;
- a second P-type transistor provided between the second node and the control line;
- a second non-volatile memory element provided between the second node and the control line and connected in series with the second P-type transistor;
- the first nonvolatile memory element includes a first magnetic tunnel junction element including a first pinned layer, a first tunnel barrier layer, and a first free layer arranged in order from a position close to the control line, or
- a first variable resistance element including a first electrode layer, a first insulating layer, and a first ion layer arranged in order from
- the first nonvolatile memory element is located between the first P-type transistor and the control line, and is in a second level above the first level including the first P-type transistor.
- the first magnetic tunnel junction element including the first free layer, the first tunnel barrier layer, and the first pinned layer, which are provided and sequentially stacked from a position close to the first layer, Or the first variable resistance element including the first ion layer, the first insulating layer, and the first electrode layer stacked in order from a position close to the first layer
- the second nonvolatile memory element is located between the second P-type transistor and the control line, and the second nonvolatile memory element is located above the first layer including the second P-type transistor.
- the second magnetic tunnel junction including the second free layer, the second tunnel barrier layer, and the second pinned layer which are provided in a hierarchy and are sequentially stacked from a position close to the first hierarchy
- the second variable resistance element including the element or the second ion layer, the second insulating layer, and the second electrode layer stacked in order from a position close to the first layer.
- the first nonvolatile memory element is located between the first P-type transistor and the first node, and a second level higher than a first level including the first P-type transistor.
- the first magnetic tunnel junction including the first pinned layer, the first tunnel barrier layer, and the first free layer that are provided in a hierarchy and are sequentially stacked from a position close to the first hierarchy
- the first variable resistance element including the element, or the first electrode layer, the first insulating layer, and the first ion layer stacked in order from a position close to the first layer;
- the second nonvolatile memory element is located between the second P-type transistor and the second node, and the second nonvolatile memory element is located above the first hierarchy including the second P-type transistor.
- the second magnetic layer including the second pinned layer, the second tunnel barrier layer, and the second free layer, which are provided in two layers and are sequentially stacked from a position close to the first layer.
- the first P-type transistor has a pair of first diffusion regions connected to the control line and the first nonvolatile memory element, respectively.
- the semiconductor device according to (4), wherein the second P-type transistor has a pair of second diffusion regions connected to the control line and the second nonvolatile memory element, respectively.
- the first inverter circuit includes a third P-type transistor and a first N-type transistor connected in parallel to each other, The semiconductor device according to any one of (1) to (5), wherein the second inverter circuit includes a fourth P-type transistor and a second N-type transistor connected in parallel to each other.
- a power supply terminal connected to a power supply for applying a voltage to the first inverter circuit and the second inverter circuit; A control unit, and Before the control unit shuts off the power supply, By turning on the first P-type transistor and setting the control line to a first potential and allowing a first current to flow from the first node to the control line, the first non-volatile property
- the storage element is set to a first resistance state indicating a first resistance value
- the second P-type transistor is turned on, and the control line is set to a second potential equal to or higher than the first potential, and a second current flows from the control line to the second node.
- the semiconductor device according to (7), wherein the second nonvolatile memory element is set to a second resistance state having a second resistance value higher than the first resistance value.
- the control unit turns on the first P-type transistor and the second P-type transistor and sets the control line to the second potential, and then turns on the power and turns on the first P-type transistor.
- the semiconductor device according to (8), wherein the potential of the first node and the potential of the second node are set by applying a voltage to the inverter circuit and the second inverter circuit.
- the first to fourth P-type transistors have first to fourth gate electrodes, respectively.
- the first to fourth N-type transistors have fifth to eighth gate electrodes, respectively.
- the first to eighth gate electrodes all extend along the first direction.
- the semiconductor device according to (7) above (11) A P-type well region; and an N-type well region adjacent to the P-type well region in the first direction; The first to fourth P-type transistors are disposed in the N-type well region, The first to fourth N-type transistors are disposed in the P-type well region, The first to fourth gate electrodes are arranged in a second direction orthogonal to the first direction, The semiconductor device according to (10), wherein the fifth to eighth gate electrodes are arranged so as to be aligned in the second direction.
- a power supply terminal connected to a power supply for applying a voltage to the first inverter circuit and the second inverter circuit; A ground terminal, and The power supply terminal is provided between any one of the first to fourth gate electrodes and the other one of the first to fourth gate electrodes in the second direction. And The ground terminal is provided between any one of the fifth to eighth gate electrodes and the other one of the fifth to eighth gate electrodes in the second direction.
- a selection line connected to both the first gate electrode and the second gate electrode and extending along the second direction; A word line connected to both the seventh gate electrode and the eighth gate electrode and extending along the second direction; A first bit line connected to the third N-type transistor and extending along the first direction;
- a power supply terminal connected to a power supply for applying a voltage to the first inverter circuit and the second inverter circuit; The semiconductor device according to (9), wherein the control unit sets the control line as a ground potential as the first potential, and sets the potential of the power source as the second potential.
- a power supply terminal connected to a power supply for applying a voltage to the first inverter circuit and the second inverter circuit;
- the first substrate unit includes a first substrate, the first P-type transistor and the second P-type transistor formed on the first substrate,
- the second substrate unit includes a second substrate, the first nonvolatile memory element formed on the second substrate, and the second nonvolatile memory element.
- the first substrate unit has a first pad exposed on a first bonding surface facing the second substrate unit;
- a flip-flop having a ring structure in which a first inverter circuit, a first connection line including a first node, a second inverter circuit, and a second connection line including a second node are sequentially connected.
- a first first conductivity type transistor provided between the first node and the control line; A first nonvolatile memory element provided between the first node and the control line and connected in series with the first first conductivity type transistor; A second first-conductivity-type transistor provided between the second node and the control line; A second nonvolatile memory element provided between the second node and the control line and connected in series with the second first conductivity type transistor; A first bit line; A first second conductivity type transistor provided between the first bit line and the first connection line; A second bit line; A second second conductivity type transistor provided between the second bit line and the second connection line;
- the first inverter circuit includes a third first conductivity type transistor and a third second conductivity type transistor connected in parallel to each other,
- the second inverter circuit includes a fourth first conductivity type transistor and a fourth second conductivity type transistor connected in parallel to each other.
- a semiconductor substrate The first to fourth P-type transistors and the first to fourth N-type transistors are each extended with a gate electrode, a source electrode and a drain electrode extending in a first direction, and with a second direction.
- the back surfaces of the fin, gate electrode, source electrode and drain electrode are in contact with the semiconductor substrate,
- the gate device, the source electrode, and the drain electrode all cover a surface other than the back surface of the fin.
- the semiconductor device according to any one of (10) to (14).
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Abstract
Description
1.第1の実施の形態(トップピン構造のMTJ素子を有する半導体装置)
2.第1の実施の形態の第1の変形例(MTJ素子の配置を変更した変形例)
3.第1の実施の形態の第2の変形例(中間電位でMTJ素子への書き込みを一括して行うようにした例)
4.第2の実施の形態(ReRAM素子を有する半導体装置)
5.第2の実施の形態の変形例(ReRAM素子の配置を変更した変形例)
6.第3の実施の形態(貼り合わせ構造を採用した半導体装置)
7.第4の実施の形態(Fin-FETを採用した半導体装置)
8.第5の実施の形態(ナノワイヤFETを採用した半導体装置)
9.その他の変形例(フリップフロップ回路の変形例)
[半導体装置1の構成]
図1から図3を参照して、本開示の第1の実施の形態としての半導体装置1の構成について説明する。図1は、半導体装置1の回路構成を表したものである。図2は、半導体装置1の平面構成を表したものである。さらに、図3は、図2に示したIII-III切断線に沿った矢視方向の断面図に相当する。
フリップフロップ回路10は、インバータ回路11と、ノードQ1を含む接続線CL1と、インバータ回路12と、ノードQ2を含む接続線CL2とが順に接続された環状構造を有する。インバータ回路11は、互いに並列接続されたP型トランジスタPTr3およびN型トランジスタNTr1を含み、インバータ回路12は、互いに並列接続されたP型トランジスタPTr4およびN型トランジスタNTr2を含むものである。ここでいうトランジスタは、例えばMOS(Metal Oxide Semiconductor)電界効果トランジスタ(FET:Field Effect Transistor)である。より具体的には、インバータ回路11では、P型トランジスタPTr3のゲート電極とN型トランジスタNTr1のゲート電極とがノードQ3において接続され、P型トランジスタPTr3のソース電極またはドレイン電極の一方と、N型トランジスタNTr1のソース電極またはドレイン電極の一方とがノードQ4において接続されている。P型トランジスタPTr3のソース電極またはドレイン電極の他方は電源端子T1を介して外部の電源Vddと接続され、N型トランジスタNTr1のソース電極またはドレイン電極の他方は接地されている。同様に、インバータ回路12では、P型トランジスタPTr4のゲート電極とN型トランジスタNTr2のゲート電極とがノードQ5において接続され、P型トランジスタPTr4のソース電極またはドレイン電極の一方と、N型トランジスタNTr2のソース電極またはドレイン電極の一方とがノードQ6において接続されている。P型トランジスタPTr4のソース電極またはドレイン電極の他方は電源端子T2を介して電源Vddと接続され、N型トランジスタNTr2のソース電極またはドレイン電極の他方は接地されている。
不揮発性記憶部20は、ノードQ1と制御線CTRLとの間に設けられ、MTJ21と直列接続されるP型トランジスタPTr1をさらに有している。また、不揮発性記憶部20は、ノードQ2と制御線CTRLとの間に、MTJ22と直列接続されるP型トランジスタPTr2をさらに有している。P型トランジスタPTr1のゲート電極422(後出)には、一端が制御部30と接続された選択線SL1の他端が接続されている。同様に、P型トランジスタPTr2のゲート電極422には、一端が制御部30と接続された選択線SL2の他端が接続されている。MTJ21,22は、それぞれ、制御線CTRLと近い位置から順に並ぶ、ピンド層Pとトンネルバリア層Iとフリー層Fとを含んでいる。
半導体装置1は、ビット線BL1と接続線SL1との間に設けられたN型トランジスタNTr3と、ビット線BL2と接続線SL2との間に設けられたN型トランジスタNTr4とをさらに備えている。N型トランジスタNTr3のゲート電極およびN型トランジスタNTr4のゲート電極は、いずれも、共通のワード線WLと接続されている。
再び図2を参照して、半導体装置1の面内方向におけるレイアウトについて説明する。半導体装置1において、4つのP型トランジスタPTr1~PTr4はそれぞれゲート電極422A~422Dを有し、4つのN型トランジスタNTr1~NTr4はそれぞれゲート電極422E~422Hを有している。これら8つのゲート電極422A~422Hは、いずれも同じ方向(Y軸方向)に沿って延在している。また、ゲート電極422A~422Dは、同一のN型ウェル領域NWELにおいて、各々の延在方向(Y軸方向)と直交するX軸方向に並ぶように配置されている。本実施の形態では、図2の紙面左側から右側へ向かうように、ゲート電極422B、ゲート電極422C、ゲート電極422D、ゲート電極422Aの順に配置されている。またゲート電極422E~422Hは、同一のP型ウェル領域PWELにおいてX軸方向に並ぶように配置されている。本実施の形態では、図2の紙面左側から右側へ向かうように、ゲート電極422H、ゲート電極422E、ゲート電極422F、ゲート電極422Gの順に配置されている。N型ウェル領域NWELとP型ウェル領域PWELとは、Y軸方向において隣り合うように配置されている。したがって、ゲート電極422Bの延長上にゲート電極422Hが配置され、ゲート電極422Cの延長上にゲート電極422Eが配置され、ゲート電極422Dの延長上にゲート電極422Fが配置され、ゲート電極422Aの延長上にゲート電極422Gが配置されている。
次に、図4A~図4Kを参照して、半導体装置1の製造方法について説明する。図4A~図4Kは、それぞれ、半導体装置1の製造方法における一工程を表す平面図である。
(基本動作)
半導体装置1における動作は制御部30からの指令により行われる。この半導体装置1では、電源を投入した状態であれば、フリップフロップ回路10にデータを書き込み、保持し、または読み出すことができる。ノードQ7とノードQ8とは互いに相補し合う相補ノードである。ノードQ7およびノードQ8のうちのいずれか一方がハイレベルとなりたほうがローレベルとなることで、フリップフロップ回路10は安定状態となり、データを記憶することができる。ワード線WLをハイレベルとしN型トランジスタNTr3およびN型トランジスタNTr4を導通状態とすることで、ビッド線BL1およびビット線BL2のデータがフリップフロップ回路10に書き込まれる。また、ビッド線BL1の電位とビット線BL2の電位とを等しくして浮遊状態(フローティング状態)としつつ、ワード線WLをハイレベルとしN型トランジスタNTr3およびN型トランジスタNTr4を導通状態とすることで、フリップフロップ回路10に書き込まれたデータをビッド線BL1およびビット線BL2に読み出すことができる。しかしながら電源を遮断してしまうと、フリップフロップ回路10に書き込まれたデータは消失してしまう。そこで、フリップフロップ回路10に書き込まれたデータを、不揮発性記憶部20において恒久的に保持するようにしている。
次に、図5Aおよび図5Bを参照して、フリップフロップ回路10に書き込まれたデータを、不揮発性記憶部20におけるMTJ21およびMTJ22に記憶させる方法について説明する。ここでは、ノードQ7にハイレベル“Lv=H”のデータが保持される一方、ノードQ8にローレベル“Lv=L”のデータが保持されている場合を説明する。制御部30は、電源Vddからの電圧印加を遮断する前に以下の動作を行うことにより、不揮発性記憶部20への書き込みを行う。なお、ワード線WLはローレベル“Lv=L”の電位に設定されており、N型トランジスタNTr3およびN型トランジスタNTr4が遮断状態とされている。また、図5Aおよび図5Bでは、導通状態の構成要素を実線で描き、遮断状態の構成要素を破線で描いている。なお、ローレベル“Lv=L”の電位とは例えば接地電位であり、ハイレベル“Lv=H”の電位とは例えば電源Vddの電位である。
不揮発性記憶部20に不揮発的に記憶されたデータは、以下のようにしてフリップフロップ回路10に再度読み出す(リストア)ことができる。以下、図6を参照して、MTJ21およびMTJ22に記憶されたデータをフリップフロップ回路10に読み出す方法について説明する。ここでは、MTJ21が抵抗値RLを示す低抵抗状態にあり、MTJ22が抵抗値RH を示す高抵抗状態にある場合を説明する。また、ワード線WLはローレベル“Lv=L”の電位に設定されており、N型トランジスタNTr3およびN型トランジスタNTr4が遮断状態とされている。
半導体装置1およびその製造方法では、フリップフロップ回路10と制御線CTRLとの間に不揮発性記憶部20を設けるようにした。ここで、不揮発性記憶部20は、互いに直列接続されたP型トランジスタPTr1およびMTJ21と、互いに直列接続されたP型トランジスタPTr2およびMTJ22とを有する。このため、半導体装置1におけるP型トランジスタとN型トランジスタとが同数となり、それら複数のP型トランジスタおよびN型トランジスタを規則的に、かつ、より狭い領域に配置することができる。よって、全体構成の小型化を図ることができる。
図9Aは上記した半導体装置1の第1の変形例である半導体装置1Aの回路図であり、図9Bは半導体装置1Aの平面図であり、図9Cは半導体装置1Aの要部断面図である。なお、図9Bでは、ゲート電極422などを含む階層を表し、他の階層における配線は破線または太い実線により省略して記載している。また、図9Cは、図9Bに示したIXC-IXC切断線に沿った矢視方向の断面を表している。上記半導体装置1では、MTJ21をP型トランジスタPTr1と制御線CTRLとの間に設け、MTJ22をP型トランジスタPTr2と制御線CTRLとの間に設けるようにした。これに対し、本変形例では、MTJ21をP型トランジスタPTr1とノードQ1との間に設け、MTJ22をP型トランジスタPTr2とノードQ2との間に設けるようにした。本変形例においても半導体装置1と同様に、MTJ21およびMTJ22は、制御線CTRLと近い位置から順にピンド層Pとトンネルバリア層Iとフリー層Fとが積層されて(並んで)いる。このため、半導体装置1Aは、半導体装置1と同様の作用効果が得られる。但し、半導体装置1AにおけるMTJ21およびMTJ22は、その断面構造において、図9Cに示したように下層としてのピンド層Pの上に中間層としてのトンネルバリア層Iと上層としてのフリー層Fとが順に積層されたいわゆるボトムピン構造を有するとよい。MTJ21,22とノードQ1,Q2とを繋ぐ配線やMTJ21,22とP型トランジスタPTr1,PTr2とを繋ぐ配線の長さが短縮され、全体構成のコンパクト化に有利となるからである。
次に、上記した半導体装置1の第2の変形例について説明する。半導体装置1では、不揮発性記憶部20へのデータの記憶を行う際、制御線CTRLの電位を、ローレベル“Lv=L”の電位(接地電位)としたのちハイレベル“Lv=H”の電位(電源Vddの電位)とし、あるいはその逆の操作を行うようにした。また、不揮発性記憶部20からのデータの読み出しを行う際、制御線CTRLの電位をハイレベル“Lv=H”の電位とした。これに対し、本変形例は、制御線CTRLの電位を、ローレベル“Lv=L”の電位(接地電位)とハイレベル“Lv=H”の電位(電源Vddの電位)との間の電位(以下、中間電位という。)に設定して、不揮発性記憶部20へのデータの記憶および不揮発性記憶部20からのデータの読み出しを行うものである。
[半導体装置2の構成]
図10A,10Bを参照して、本開示の第2の実施の形態としての半導体装置2の構成について説明する。図10Aは、半導体装置2の回路構成を表したものである。図10Bは、半導体装置2の要部断面構成を表したものである。
半導体装置2における基本動作は上記第1の実施の形態の半導体装置1と同様である。
図12Aは、上記した半導体装置2の変形例である半導体装置2Aの回路図である。また、図12Bは、半導体装置2Aの要部断面構成を表したものである。上記半導体装置2では、抵抗変化素子61をP型トランジスタPTr1と制御線CTRLとの間に設け、抵抗変化素子62をP型トランジスタPTr2と制御線CTRLとの間に設けるようにした。これに対し、本変形例では、抵抗変化素子61をP型トランジスタPTr1とノードQ1との間に設け、抵抗変化素子62をP型トランジスタPTr2とノードQ2との間に設けるようにした。本変形例においても半導体装置2と同様に、抵抗変化素子61および抵抗変化素子62は、制御線CTRLと近い位置から順に電極層65と絶縁層64とイオン層63とが積層された(並ぶ)構造を有する。このため、半導体装置2Aは、半導体装置2と同様の作用効果が得られる。なお、半導体装置2Aにおける抵抗変化素子61,62は、その断面構造において、図12Bに示したように下層としての電極層65の上に絶縁層64とイオン層63とが順に積層された構造を有するとよい。
[半導体装置3の構成]
図13を参照して、本開示の第3の実施の形態としての半導体装置3の構成について説明する。図13は、半導体装置3の要部断面構成を表したものであり、第1の実施の形態の半導体装置1を表す図3に相当する箇所を示している。
次に、図14A~図14Cを参照して、半導体装置3の製造方法について説明する。図14A~図14Cは、それぞれ、半導体装置3の製造方法における一工程を表す平面図である。
このような半導体装置3においても、上記第1の実施の形態の半導体装置1と同様の機能を発揮することができる。また、半導体装置3では、基板ユニットU2において、基板51上にMTJ21,22を形成する際、ピンド層P、トンネルバリア層I、フリー層Fの順に積層することができる。このため、フリー層F、ピンド層P、トンネルバリア層Iの順に積層する場合と比較して、応答性および動作安定性に優れたMTJ21,22が比較的容易に得られる。
[半導体装置4の構成]
図15A,15Bを参照して、本開示の第4の実施の形態としての半導体装置4の構成について説明する。図15Aは半導体装置4の要部断面構成を表したものであり、図15Bは半導体装置4の要部平面構成を表す。図15Aは、図15Bに示したXVA-XVA切断線に沿った矢視方向の断面図に相当する。なお、図15Aおよび図15Bでは、半導体装置4の要部であるフィン電界効果トランジスタ(Fin-FET)80の近傍のみを記載し、他は省略している。
図16は、本開示の第5の実施の形態としての半導体装置5の断面構成を表したものである。半導体装置5は、Fin-FET80の代わりにナノワイヤ(Nano-wire)FETであるトランジスタ80Aを備える点において、上記第4の実施の形態の半導体装置4と異なる。具体的には、半導体装置5では、絶縁膜Z10がフィン81の裏面81Bと基板41との間に設けられている。さらに、基板41の一部に電極84が埋設されている。ゲート電極84は、絶縁膜Z10を挟んでゲート電極82Gと対向する位置に埋設されている。その他の点については、半導体装置4と同様の構成である。
第1のインバータ回路と、第1のノードを含む第1の接続線と、第2のインバータ回路と、第2のノードを含む第2の接続線とが順に接続された環状構造を有するフリップフロップ回路と、
制御線と、
前記第1のノードと前記制御線との間に設けられた第1のP型トランジスタと、
前記第1のノードと前記制御線との間に設けられ、前記第1のP型トランジスタと直列接続される第1の不揮発性記憶素子と、
前記第2のノードと前記制御線との間に設けられた第2のP型トランジスタと、
前記第2のノードと前記制御線との間に設けられ、前記第2のP型トランジスタと直列接続される第2の不揮発性記憶素子と
を備え、
前記第1の不揮発性記憶素子は、前記制御線と近い位置から順に並ぶ第1のピンド層と第1のトンネルバリア層と第1のフリー層とを含む第1の磁気トンネル接合素子、または前記制御線と近い位置から順に並ぶ第1の電極層と第1の絶縁層と第1のイオン層とを含む第1の抵抗変化素子であり、
前記第2の不揮発性記憶素子は、前記制御線と近い位置から順に並ぶ第2のピンド層と第2のトンネルバリア層と第2のフリー層とを含む第2の磁気トンネル接合素子、または前記制御線と近い位置から順に並ぶ第2の電極層と第2の絶縁層と第2のイオン層とを含む第2の抵抗変化素子である
半導体装置。
(2)
前記第1の不揮発性記憶素子は、前記第1のP型トランジスタと前記制御線との間に位置し、前記第1のP型トランジスタを含む第1の階層よりも上の第2の階層に設けられると共に、前記第1の階層に近い位置から順に積層された前記第1のフリー層と前記第1のトンネルバリア層と前記第1のピンド層とを含む前記第1の磁気トンネル接合素子、または前記第1の階層に近い位置から順に積層された前記第1のイオン層と前記第1の絶縁層と前記第1の電極層とを含む前記第1の抵抗変化素子であり、
前記第2の不揮発性記憶素子は、前記第2のP型トランジスタと前記制御線との間に位置し、前記第2のP型トランジスタを含む前記第1の階層よりも上の前記第2の階層に設けられると共に、前記第1の階層に近い位置から順に積層された前記第2のフリー層と前記第2のトンネルバリア層と前記第2のピンド層とを含む前記第2の磁気トンネル接合素子、または前記第1の階層に近い位置から順に積層された前記第2のイオン層と前記第2の絶縁層と前記第2の電極層とを含む前記第2の抵抗変化素子である
上記(1)記載の半導体装置。
(3)
前記第1のP型トランジスタは、前記第1のノードおよび前記第1の不揮発性記憶素子とそれぞれ接続された一対の第1の拡散領域を有し、
前記第2のP型トランジスタは、前記第2のノードおよび前記第2の不揮発性記憶素子とそれぞれ接続された一対の第2の拡散領域を有する
上記(2)記載の半導体装置。
(4)
前記第1の不揮発性記憶素子は、前記第1のP型トランジスタと前記第1のノードとの間に位置し、前記第1のP型トランジスタを含む第1の階層よりも上の第2の階層に設けられると共に、前記第1の階層に近い位置から順に積層された前記第1のピンド層と前記第1のトンネルバリア層と前記第1のフリー層とを含む前記第1の磁気トンネル接合素子、または前記第1の階層に近い位置から順に積層された前記第1の電極層と前記第1の絶縁層と前記第1のイオン層とを含む前記第1の抵抗変化素子であり、
前記第2の不揮発性記憶素子は、前記第2のP型トランジスタと前記第2のノードとの間に位置し、前記第2のP型トランジスタを含む前記第1の階層よりも上の前記第2の階層に設けられると共に、前記第1の階層に近い位置から順に積層された前記第2のピンド層と前記第2のトンネルバリア層と前記第2のフリー層とを含む前記第2の磁気トンネル接合素子、または前記第1の階層に近い位置から順に積層された前記第2の電極層と前記第2の絶縁層と前記第2のイオン層とを含む前記第2の抵抗変化素子である
上記(1)記載の半導体装置。
(5)
前記第1のP型トランジスタは、前記制御線および前記第1の不揮発性記憶素子とそれぞれ接続された一対の第1の拡散領域を有し、
前記第2のP型トランジスタは、前記制御線および前記第2の不揮発性記憶素子とそれぞれ接続された一対の第2の拡散領域を有する
上記(4)記載の半導体装置。
(6)
前記第1のインバータ回路は、互いに並列接続された第3のP型トランジスタおよび第1のN型トランジスタを含み、
前記第2のインバータ回路は、互いに並列接続された第4のP型トランジスタおよび第2のN型トランジスタを含む
上記(1)から(5)のいずれか1つに記載の半導体装置。
(7)
第1のビット線と、
前記第1のビット線と前記第1の接続線との間に設けられた第3のN型トランジスタと、
第2のビット線と、
前記第2のビット線と前記第2の接続線との間に設けられた第4のN型トランジスタと
をさらに備えた
上記(6)記載の半導体装置。
(8)
前記第1のインバータ回路および前記第2のインバータ回路に電圧を印加する電源が接続される電源端子と、
制御部と
をさらに備え、
前記制御部は、前記電源を遮断する前に、
前記第1のP型トランジスタをオン状態とすると共に前記制御線を第1の電位に設定して前記第1のノードから前記制御線へ第1の電流を流すことにより、前記第1の不揮発性記憶素子を第1の抵抗値を示す第1の抵抗状態とし、
前記第2のP型トランジスタをオン状態とすると共に前記制御線を前記第1の電位と同等以上の第2の電位に設定して前記制御線から前記第2のノードへ第2の電流を流すことにより、前記第2の不揮発性記憶素子を前記第1の抵抗値よりも高い第2の抵抗値を示す第2の抵抗状態とする
上記(7)記載の半導体装置。
(9)
前記制御部は、前記第1のP型トランジスタおよび前記第2のP型トランジスタをオン状態とすると共に前記制御線を前記第2の電位に設定したのち、前記電源を投入して前記第1のインバータ回路および前記第2のインバータ回路に電圧を印加することにより、前記第1のノードの電位および前記第2のノードの電位を設定する
上記(8)記載の半導体装置。
(10)
前記第1から第4のP型トランジスタは、それぞれ、第1から第4のゲート電極を有し、
前記第1から第4のN型トランジスタは、それぞれ、第5から第8のゲート電極を有し、
第1から第8のゲート電極は、いずれも、第1の方向に沿って延在している
上記(7)記載の半導体装置。
(11)
P型ウェル領域と、前記第1の方向において前記P型ウェル領域と隣り合うN型ウェル領域とをさらに備え、
前記第1から第4のP型トランジスタは、前記N型ウェル領域に配置され、
前記第1から第4のN型トランジスタは、前記P型ウェル領域に配置され、
前記第1から第4のゲート電極は、前記第1の方向と直交する第2の方向に並ぶように配置され、
前記第5から第8のゲート電極は、前記第2の方向に並ぶように配置されている
上記(10)記載の半導体装置。
(12)
前記第1のインバータ回路および前記第2のインバータ回路に電圧を印加する電源が接続される電源端子と、
接地端子と
をさらに備え、
前記電源端子は、前記第2の方向において、前記第1から第4のゲート電極のうちのいずれか1つと、前記第1から第4のゲート電極のうちの他の1つとの間に設けられており、
前記接地端子は、前記第2の方向において、前記第5から第8のゲート電極のうちのいずれか1つと、前記第5から第8のゲート電極のうちの他の1つとの間に設けられている
上記(11)記載の半導体装置。
(13)
前記第1から第4のゲート電極は、前記第2の方向において、前記第1の不揮発性記憶素子と前記第2の不揮発性記憶素子との間に配置されている
上記(11)または(12)に記載の半導体装置。
(14)
前記第1のゲート電極および前記第2のゲート電極の双方と接続され、前記第2の方向に沿って延在する一の選択線と、
前記第7のゲート電極および前記第8のゲート電極の双方と接続され、前記第2の方向に沿って延在する一のワード線と、
前記第3のN型トランジスタと接続され、前記第1の方向に沿って延在する第1のビット線と、
前記第4のN型トランジスタと接続され、前記第1の方向に沿って延在する第2のビット線と
をさらに備えた
上記(11)から(13)のいずれか1つに記載の半導体装置。
(15)
前記第1のインバータ回路および前記第2のインバータ回路に電圧を印加する電源が接続される電源端子をさらに備え、
前記制御部は、前記制御線を、前記第1の電位として接地電位に設定し、前記第2の電位として前記電源の電位に設定する
上記(9)記載の半導体装置。
(16)
前記第1のインバータ回路および前記第2のインバータ回路に電圧を印加する電源が接続される電源端子をさらに備え、
前記制御部は、前記制御線を、前記1の電位および前記第2の電位として接地電位と前記電源の電位との間の中間電位に設定する
上記(9)記載の半導体装置。
(17)
第1の基板ユニットと第2の基板ユニットとの貼り合わせ構造を有し、
前記第1の基板ユニットは、第1の基板と、前記第1の基板の上に形成された前記第1のP型トランジスタおよび前記第2のP型トランジスタとを含み、
前記第2の基板ユニットは、第2の基板と、前記第2の基板の上に形成された前記第1の不揮発性記憶素子および前記第2の不揮発性記憶素子を含む
上記(1)から(16)のいずれか1つに記載の半導体装置。
(18)
前記第1の基板ユニットは、前記第2の基板ユニットと対向する第1の接合面に露出した第1のパッドを有し、
前記第2の基板ユニットは、前記第1の基板ユニットと対向する第2の接合面に露出した第2のパッドを有する
上記(17)記載の半導体装置。
(19)
第1のインバータ回路と、第1のノードを含む第1の接続線と、第2のインバータ回路と、第2のノードを含む第2の接続線とが順に接続された環状構造を有するフリップフロップ回路と、
制御線と、
前記第1のノードと前記制御線との間に設けられた第1の第1導電型トランジスタと、
前記第1のノードと前記制御線との間に設けられ、前記第1の第1導電型トランジスタと直列接続される第1の不揮発性記憶素子と、
前記第2のノードと前記制御線との間に設けられた第2の第1導電型トランジスタと、
前記第2のノードと前記制御線との間に設けられ、前記第2の第1導電型トランジスタと直列接続される第2の不揮発性記憶素子と、
第1のビット線と、
前記第1のビット線と前記第1の接続線との間に設けられた第1の第2導電型トランジスタと、
第2のビット線と、
前記第2のビット線と前記第2の接続線との間に設けられた第2の第2導電型トランジスタと
を備え、
前記第1のインバータ回路は、互いに並列接続された第3の第1導電型トランジスタおよび第3の第2導電型トランジスタを含み、
前記第2のインバータ回路は、互いに並列接続された第4の第1導電型トランジスタおよび第4の第2導電型トランジスタを含む
半導体装置。
(20)
半導体基板をさらに備え、
前記第1から第4のP型トランジスタおよび前記第1から第4のN型トランジスタは、それぞれ、第1の方向に延伸されたゲート電極、ソース電極およびドレイン電極と、第2の方向に延伸されたフィンとを有し、
前記フィン、ゲート電極、ソース電極およびドレイン電極の各々の裏面は前記半導体基板と接し、
前記ゲート電極、前記ソース電極および前記ドレイン電極は、いずれも、前記フィンの裏面以外の面を覆っている
上記(10)から(14)のいずれか1つに記載の半導体装置。
Claims (20)
- 第1のインバータ回路と、第1のノードを含む第1の接続線と、第2のインバータ回路と、第2のノードを含む第2の接続線とが順に接続された環状構造を有するフリップフロップ回路と、
制御線と、
前記第1のノードと前記制御線との間に設けられた第1のP型トランジスタと、
前記第1のノードと前記制御線との間に設けられ、前記第1のP型トランジスタと直列接続される第1の不揮発性記憶素子と、
前記第2のノードと前記制御線との間に設けられた第2のP型トランジスタと、
前記第2のノードと前記制御線との間に設けられ、前記第2のP型トランジスタと直列接続される第2の不揮発性記憶素子と
を備え、
前記第1の不揮発性記憶素子は、前記制御線と近い位置から順に並ぶ第1のピンド層と第1のトンネルバリア層と第1のフリー層とを含む第1の磁気トンネル接合素子、または前記制御線と近い位置から順に並ぶ第1の電極層と第1の絶縁層と第1のイオン層とを含む第1の抵抗変化素子であり、
前記第2の不揮発性記憶素子は、前記制御線と近い位置から順に並ぶ第2のピンド層と第2のトンネルバリア層と第2のフリー層とを含む第2の磁気トンネル接合素子、または前記制御線と近い位置から順に並ぶ第2の電極層と第2の絶縁層と第2のイオン層とを含む第2の抵抗変化素子である
半導体装置。 - 前記第1の不揮発性記憶素子は、前記第1のP型トランジスタと前記制御線との間に位置し、前記第1のP型トランジスタを含む第1の階層よりも上の第2の階層に設けられると共に、前記第1の階層に近い位置から順に積層された前記第1のフリー層と前記第1のトンネルバリア層と前記第1のピンド層とを含む前記第1の磁気トンネル接合素子、または前記第1の階層に近い位置から順に積層された前記第1のイオン層と前記第1の絶縁層と前記第1の電極層とを含む前記第1の抵抗変化素子であり、
前記第2の不揮発性記憶素子は、前記第2のP型トランジスタと前記制御線との間に位置し、前記第2のP型トランジスタを含む前記第1の階層よりも上の前記第2の階層に設けられると共に、前記第1の階層に近い位置から順に積層された前記第2のフリー層と前記第2のトンネルバリア層と前記第2のピンド層とを含む前記第2の磁気トンネル接合素子、または前記第1の階層に近い位置から順に積層された前記第2のイオン層と前記第2の絶縁層と前記第2の電極層とを含む前記第2の抵抗変化素子である
請求項1記載の半導体装置。 - 前記第1のP型トランジスタは、前記第1のノードおよび前記第1の不揮発性記憶素子とそれぞれ接続された一対の第1の拡散領域を有し、
前記第2のP型トランジスタは、前記第2のノードおよび前記第2の不揮発性記憶素子とそれぞれ接続された一対の第2の拡散領域を有する
請求項2記載の半導体装置。 - 前記第1の不揮発性記憶素子は、前記第1のP型トランジスタと前記第1のノードとの間に位置し、前記第1のP型トランジスタを含む第1の階層よりも上の第2の階層に設けられると共に、前記第1の階層に近い位置から順に積層された前記第1のピンド層と前記第1のトンネルバリア層と前記第1のフリー層とを含む前記第1の磁気トンネル接合素子、または前記第1の階層に近い位置から順に積層された前記第1の電極層と前記第1の絶縁層と前記第1のイオン層とを含む前記第1の抵抗変化素子であり、
前記第2の不揮発性記憶素子は、前記第2のP型トランジスタと前記第2のノードとの間に位置し、前記第2のP型トランジスタを含む前記第1の階層よりも上の前記第2の階層に設けられると共に、前記第1の階層に近い位置から順に積層された前記第2のピンド層と前記第2のトンネルバリア層と前記第2のフリー層とを含む前記第2の磁気トンネル接合素子、または前記第1の階層に近い位置から順に積層された前記第2の電極層と前記第2の絶縁層と前記第2のイオン層とを含む前記第2の抵抗変化素子である
請求項1記載の半導体装置。 - 前記第1のP型トランジスタは、前記制御線および前記第1の不揮発性記憶素子とそれぞれ接続された一対の第1の拡散領域を有し、
前記第2のP型トランジスタは、前記制御線および前記第2の不揮発性記憶素子とそれぞれ接続された一対の第2の拡散領域を有する
請求項4記載の半導体装置。 - 前記第1のインバータ回路は、互いに並列接続された第3のP型トランジスタおよび第1のN型トランジスタを含み、
前記第2のインバータ回路は、互いに並列接続された第4のP型トランジスタおよび第2のN型トランジスタを含む
請求項1記載の半導体装置。 - 第1のビット線と、
前記第1のビット線と前記第1の接続線との間に設けられた第3のN型トランジスタと、
第2のビット線と、
前記第2のビット線と前記第2の接続線との間に設けられた第4のN型トランジスタと
をさらに備えた
請求項6記載の半導体装置。 - 前記第1のインバータ回路および前記第2のインバータ回路に電圧を印加する電源が接続される電源端子と、
制御部と
をさらに備え、
前記制御部は、前記電源を遮断する前に、
前記第1のP型トランジスタをオン状態とすると共に前記制御線を第1の電位に設定して前記第1のノードから前記制御線へ第1の電流を流すことにより、前記第1の不揮発性記憶素子を第1の抵抗値を示す第1の抵抗状態とし、
前記第2のP型トランジスタをオン状態とすると共に前記制御線を前記第1の電位と同等以上の第2の電位に設定して前記制御線から前記第2のノードへ第2の電流を流すことにより、前記第2の不揮発性記憶素子を前記第1の抵抗値よりも高い第2の抵抗値を示す第2の抵抗状態とする
請求項7記載の半導体装置。 - 前記制御部は、前記第1のP型トランジスタおよび前記第2のP型トランジスタをオン状態とすると共に前記制御線を前記第2の電位に設定したのち、前記電源を投入して前記第1のインバータ回路および前記第2のインバータ回路に電圧を印加することにより、前記第1のノードの電位および前記第2のノードの電位を設定する
請求項8記載の半導体装置。 - 前記第1から第4のP型トランジスタは、それぞれ、第1から第4のゲート電極を有し、
前記第1から第4のN型トランジスタは、それぞれ、第5から第8のゲート電極を有し、
第1から第8のゲート電極は、いずれも、第1の方向に沿って延在している
請求項7記載の半導体装置。 - P型ウェル領域と、前記第1の方向において前記P型ウェル領域と隣り合うN型ウェル領域とをさらに備え、
前記第1から第4のP型トランジスタは、前記N型ウェル領域に配置され、
前記第1から第4のN型トランジスタは、前記P型ウェル領域に配置され、
前記第1から第4のゲート電極は、前記第1の方向と直交する第2の方向に並ぶように配置され、
前記第5から第8のゲート電極は、前記第2の方向に並ぶように配置されている
請求項10記載の半導体装置。 - 前記第1のインバータ回路および前記第2のインバータ回路に電圧を印加する電源が接続される電源端子と、
接地端子と
をさらに備え、
前記電源端子は、前記第2の方向において、前記第1から第4のゲート電極のうちのいずれか1つと、前記第1から第4のゲート電極のうちの他の1つとの間に設けられており、
前記接地端子は、前記第2の方向において、前記第5から第8のゲート電極のうちのいずれか1つと、前記第5から第8のゲート電極のうちの他の1つとの間に設けられている
請求項11記載の半導体装置。 - 前記第1から第4のゲート電極は、前記第2の方向において、前記第1の不揮発性記憶素子と前記第2の不揮発性記憶素子との間に配置されている
請求項11記載の半導体装置。 - 前記第1のゲート電極および前記第2のゲート電極の双方と接続され、前記第2の方向に沿って延在する一の選択線と、
前記第7のゲート電極および前記第8のゲート電極の双方と接続され、前記第2の方向に沿って延在する一のワード線と、
前記第3のN型トランジスタと接続され、前記第1の方向に沿って延在する第1のビット線と、
前記第4のN型トランジスタと接続され、前記第1の方向に沿って延在する第2のビット線と
をさらに備えた
請求項11記載の半導体装置。 - 前記第1のインバータ回路および前記第2のインバータ回路に電圧を印加する電源が接続される電源端子をさらに備え、
前記制御部は、前記制御線を、前記第1の電位として接地電位に設定し、前記第2の電位として前記電源の電位に設定する
請求項9記載の半導体装置。 - 前記第1のインバータ回路および前記第2のインバータ回路に電圧を印加する電源が接続される電源端子をさらに備え、
前記制御部は、前記制御線を、前記1の電位および前記第2の電位として接地電位と前記電源の電位との間の中間電位に設定する
請求項9記載の半導体装置。 - 第1の基板ユニットと第2の基板ユニットとの貼り合わせ構造を有し、
前記第1の基板ユニットは、第1の基板と、前記第1の基板の上に形成された前記第1のP型トランジスタおよび前記第2のP型トランジスタとを含み、
前記第2の基板ユニットは、第2の基板と、前記第2の基板の上に形成された前記第1の不揮発性記憶素子および前記第2の不揮発性記憶素子を含む
請求項1記載の半導体装置。 - 前記第1の基板ユニットは、前記第2の基板ユニットと対向する第1の接合面に露出した第1のパッドを有し、
前記第2の基板ユニットは、前記第1の基板ユニットと対向する第2の接合面に露出した第2のパッドを有する
請求項17記載の半導体装置。 - 第1のインバータ回路と、第1のノードを含む第1の接続線と、第2のインバータ回路と、第2のノードを含む第2の接続線とが順に接続された環状構造を有するフリップフロップ回路と、
制御線と、
前記第1のノードと前記制御線との間に設けられた第1の第1導電型トランジスタと、
前記第1のノードと前記制御線との間に設けられ、前記第1の第1導電型トランジスタと直列接続される第1の不揮発性記憶素子と、
前記第2のノードと前記制御線との間に設けられた第2の第1導電型トランジスタと、
前記第2のノードと前記制御線との間に設けられ、前記第2の第1導電型トランジスタと直列接続される第2の不揮発性記憶素子と、
第1のビット線と、
前記第1のビット線と前記第1の接続線との間に設けられた第1の第2導電型トランジスタと、
第2のビット線と、
前記第2のビット線と前記第2の接続線との間に設けられた第2の第2導電型トランジスタと
を備え、
前記第1のインバータ回路は、互いに並列接続された第3の第1導電型トランジスタおよび第3の第2導電型トランジスタを含み、
前記第2のインバータ回路は、互いに並列接続された第4の第1導電型トランジスタおよび第4の第2導電型トランジスタを含む
半導体装置。 - 半導体基板をさらに備え、
前記第1から第4のP型トランジスタおよび前記第1から第4のN型トランジスタは、それぞれ、第1の方向に延伸されたゲート電極、ソース電極およびドレイン電極と、第2の方向に延伸されたフィンとを有し、
前記フィン、ゲート電極、ソース電極およびドレイン電極の各々の裏面は前記半導体基板と接し、
前記ゲート電極、前記ソース電極および前記ドレイン電極は、いずれも、前記フィンの裏面以外の面を覆っている
請求項10記載の半導体装置。
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