WO2013108593A1 - 抵抗変化型不揮発性記憶装置の製造方法及び抵抗変化型不揮発性記憶装置 - Google Patents
抵抗変化型不揮発性記憶装置の製造方法及び抵抗変化型不揮発性記憶装置 Download PDFInfo
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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
- H10N70/011—Manufacture or treatment of multistable switching devices
- H10N70/021—Formation of switching materials, e.g. deposition of layers
-
- 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
- H01L29/86—Types of semiconductor device ; Multistep manufacturing processes therefor controllable only by variation of the electric current supplied, or only the electric potential applied, to one or more of the electrodes carrying the current to be rectified, amplified, oscillated or switched
- H01L29/861—Diodes
- H01L29/872—Schottky diodes
-
- 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
- H01L27/102—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 bipolar components
- H01L27/1021—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 bipolar components including diodes only
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10B—ELECTRONIC MEMORY DEVICES
- H10B63/00—Resistance change memory devices, e.g. resistive RAM [ReRAM] devices
- H10B63/20—Resistance change memory devices, e.g. resistive RAM [ReRAM] devices comprising selection components having two electrodes, e.g. diodes
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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
- H10N70/011—Manufacture or treatment of multistable switching devices
- H10N70/041—Modification of switching materials after formation, e.g. doping
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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
- H10N70/011—Manufacture or treatment of multistable switching devices
- H10N70/061—Shaping switching materials
- H10N70/063—Shaping switching materials by etching of pre-deposited switching material layers, e.g. lithography
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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
- H10N70/20—Multistable switching devices, e.g. memristors
- H10N70/24—Multistable switching devices, e.g. memristors based on migration or redistribution of ionic species, e.g. anions, vacancies
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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
- H10N70/801—Constructional details of multistable switching devices
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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
- H10N70/801—Constructional details of multistable switching devices
- H10N70/821—Device geometry
- H10N70/826—Device geometry adapted for essentially vertical current flow, e.g. sandwich or pillar type devices
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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
- H10N70/801—Constructional details of multistable switching devices
- H10N70/821—Device geometry
- H10N70/828—Current flow limiting means within the switching material region, e.g. constrictions
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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
- H10N70/801—Constructional details of multistable switching devices
- H10N70/881—Switching materials
- H10N70/883—Oxides or nitrides
- H10N70/8833—Binary metal oxides, e.g. TaOx
Definitions
- the present invention relates to a method of manufacturing a variable resistance nonvolatile memory device having a variable resistance element whose resistance value changes by application of an electric pulse, and a variable resistance nonvolatile memory device.
- the resistance change element is an element having a property that the resistance value reversibly changes by an electric signal (electric pulse), and can store information corresponding to the resistance value in a nonvolatile manner.
- variable resistance element As an example of a large-capacity nonvolatile memory equipped with a resistance change element, for example, a nonvolatile memory device equipped with a resistance change element as described in Patent Document 1 has been proposed.
- This variable resistance element is configured by stacking a plurality of variable resistance layers.
- Each variable resistance layer is composed of transition metal oxides having different degrees of oxygen deficiency.
- a resistance change element is used as a storage unit, and a diode element is used as a switching element.
- a memory cell is formed by a series circuit of the variable resistance element and the diode element.
- the resistance change element is formed by sandwiching a resistance change layer between an upper electrode and a lower electrode. Information is stored in the resistance change layer by a change in electrical resistance caused by electrical stress.
- the diode element is a two-terminal non-linear element having non-linear current / voltage characteristics in which current change with respect to voltage change is not constant. Since current flows through the nonlinear element in both directions when the memory cell is rewritten, the nonlinear element has, for example, bidirectional current symmetry and nonlinear current / voltage characteristics. With the above configuration, a current having a current density of 30 kA / cm 2 or more necessary for rewriting the resistance change element can be flowed, and the capacity of the nonvolatile memory can be increased.
- variable resistance nonvolatile memory device has the following problems.
- an electric pulse is first applied.
- the initial resistance value (the resistance value immediately after manufacture) is higher than the resistance value in the high resistance state during a normal resistance change. Therefore, even if an electric pulse is applied in this initial state, each resistance change layer does not change in resistance.
- an electric pulse (initial breakdown voltage) is applied to the resistance change layer in the initial state, and an initial breakdown is formed to form a conductive path in a part of the second resistance change layer. There is a need to do. When this initial breakdown is performed, an unnecessary voltage is distributed to the transistors and parasitic resistance components other than the variable resistance element, and therefore it is necessary to apply a sufficient voltage to the variable resistance element as the initial breakdown voltage. .
- the active area is an effective area that affects the electrical characteristics of the variable resistance element, and refers to the maximum cross-sectional area in the path through which current flows in the variable resistance element.
- the present invention solves the above-described problems, and the object thereof is to realize a reduction in the initial breakdown voltage and a reduction in the application time of the initial breakdown voltage, and a diode element. It is an object to provide a resistance change type nonvolatile memory device manufacturing method and a resistance change type nonvolatile memory device capable of preventing a reduction in driving capability.
- a method of manufacturing a variable resistance nonvolatile memory device includes a step of forming a diode element having a semiconductor layer over a substrate, and a first step on the diode element.
- Forming a variable resistance element configured by laminating the electrode, the variable resistance layer, and the second electrode in this order, covering the side wall of the semiconductor layer of the diode element, and the variable resistance element Forming a first oxygen barrier layer that does not cover at least a part of the side wall of the variable resistance layer; and oxidizing the side wall of the variable resistance layer that is exposed without being covered by the first oxygen barrier layer.
- a step of performing includes a step of forming a diode element having a semiconductor layer over a substrate, and a first step on the diode element.
- the first oxygen barrier layer is formed so as to cover the sidewall of the semiconductor layer of the diode element.
- FIG. 1 is a cross-sectional view showing the configuration of the variable resistance nonvolatile memory device according to the first embodiment.
- 2A is a cross-sectional view illustrating the method of manufacturing the variable resistance nonvolatile memory device according to Embodiment 1.
- FIG. 2B is a cross-sectional view illustrating the method of manufacturing the variable resistance nonvolatile memory device according to Embodiment 1.
- FIG. 2C is a cross-sectional view showing the method of manufacturing the variable resistance nonvolatile memory device according to the first embodiment.
- FIG. 2D is a cross-sectional view illustrating the method of manufacturing the variable resistance nonvolatile memory device according to the first embodiment.
- FIG. 2E is a cross-sectional view showing the method of manufacturing the variable resistance nonvolatile memory device according to the first embodiment.
- 2F is a cross-sectional view illustrating the method of manufacturing the variable resistance nonvolatile memory device according to the first embodiment.
- FIG. FIG. 2G is a cross-sectional view showing the method of manufacturing the variable resistance nonvolatile memory device according to the first embodiment.
- FIG. 2H is a cross-sectional view showing the method of manufacturing the variable resistance nonvolatile memory device according to the first embodiment.
- FIG. 2I is a cross-sectional view illustrating the method of manufacturing the variable resistance nonvolatile memory device according to the first embodiment.
- FIG. 3 is a cross-sectional view showing a configuration of the variable resistance nonvolatile memory device according to the second embodiment.
- FIG. 4A is a cross-sectional view illustrating the method of manufacturing the variable resistance nonvolatile memory device according to the second embodiment.
- 4B is a cross-sectional view illustrating the method of manufacturing the variable resistance nonvolatile memory device according to Embodiment 2.
- FIG. 4C is a cross-sectional view illustrating the method of manufacturing the variable resistance nonvolatile memory device according to Embodiment 2.
- FIG. 4D is a cross-sectional view illustrating the method of manufacturing the variable resistance nonvolatile memory device according to the second embodiment.
- FIG. 5 is a cross-sectional view showing a configuration of a conventional variable resistance nonvolatile memory device.
- FIG. 6A is a cross-sectional view illustrating a conventional method of manufacturing a variable resistance nonvolatile memory device.
- FIG. 6B is a cross-sectional view illustrating the conventional method of manufacturing the variable resistance nonvolatile memory device.
- FIG. 6C is a cross-sectional view illustrating the conventional method of manufacturing the variable resistance nonvolatile memory device.
- FIG. 6D is a cross-sectional view illustrating the conventional method of manufacturing the variable resistance nonvolatile memory device.
- FIG. 6E is a cross-sectional view illustrating the method of manufacturing the conventional variable resistance nonvolatile memory device.
- FIG. 6F is a cross-sectional view illustrating the conventional method of manufacturing the variable resistance nonvolatile memory device.
- FIG. 6G is a cross-sectional view illustrating a conventional method of manufacturing a variable resistance nonvolatile memory device.
- FIG. 7 is a graph showing the relationship (initial breakdown voltage characteristics) between the amount of side wall oxidation of the resistance change element and the initial breakdown voltage in the conventional variable resistance nonvolatile memory device.
- FIG. 8 is a cross-sectional view of a conventional variable resistance nonvolatile memory device according to a TEM image.
- FIG. 9 is a graph showing IV characteristics of an MSM diode element of a conventional variable resistance nonvolatile memory device.
- FIG. 5 is a cross-sectional view showing a configuration of a conventional variable resistance nonvolatile memory device.
- a first wiring 501 and a first interlayer insulating layer 502 are formed on a substrate 500.
- a first contact plug 503 is formed through the first interlayer insulating layer 502, and the first contact plug 503 is electrically connected to the first wiring 501.
- an MSM (Metal / Semiconductor / Metal) diode element 50a is formed so as to cover the first contact plug 503, and a resistance change element 50b is formed on the MSM diode element 50a.
- MSM Metal / Semiconductor / Metal
- the MSM diode element 50 a includes a lower electrode 504 that is electrically connected to the first contact plug 503, an upper electrode 506 that is disposed to face the lower electrode 504, and a lower electrode 504 and an upper electrode 506.
- the semiconductor layer 505 is arranged.
- the semiconductor layer 505 is composed of a nitrogen-deficient silicon nitride film (SiN x ).
- the resistance change element 50b is disposed between the lower electrode 506 (shared with the upper electrode 506 of the MSM diode element 50a), the upper electrode 508 disposed to face the lower electrode 506, and the lower electrode 506 and the upper electrode 508.
- the resistance change layer 507 is formed.
- the resistance change layer 507 has a stacked structure of a first resistance change layer 507a and a second resistance change layer 507b.
- Each of the first resistance change layer 507a and the second resistance change layer 507b is made of a transition metal oxide mainly containing oxygen-deficient tantalum oxide (TaO x , 0 ⁇ x ⁇ 2.5).
- the degree of oxygen deficiency of the second transition metal oxide constituting the second resistance change layer 507b is smaller than the degree of oxygen deficiency of the first transition metal oxide constituting the first resistance change layer 507a.
- a third resistance change layer 507c having a smaller oxygen deficiency is formed on the side wall (outer peripheral portion) of the first resistance change layer 507a.
- the third resistance change layer 507c having a relatively high resistance value is arranged on the side wall of the first resistance change layer 507a having a relatively low resistance value, the planar direction of the first resistance change layer 507a Is smaller than the area of the electrode region of the upper electrode 508.
- the density of current flowing from the first resistance change layer 507a to the second resistance change layer 507b increases, and a conductive path is easily formed in the second resistance change layer 507b. Thereby, the initial breakdown voltage of the variable resistance nonvolatile memory device 50 can be reduced.
- a second interlayer insulating layer 510 is formed so as to cover the MSM diode element 50a and the variable resistance element 50b.
- a second contact plug 511 is formed through the second interlayer insulating layer 510, and the second contact plug 511 is electrically connected to the upper electrode 508 of the resistance change element 50b. Further, a second wiring 512 that is electrically connected to the second contact plug 511 is formed.
- 6A to 6G are cross-sectional views showing a conventional method of manufacturing a variable resistance nonvolatile memory device.
- a first wiring 501 and a first interlayer insulating layer 502 are formed on a substrate 500.
- a first contact plug 503 that penetrates the first interlayer insulating layer 502 and is electrically connected to the first wiring 501 is formed.
- a first conductive film 504 ′ made of tantalum nitride is formed on the first interlayer insulating layer 502 so as to cover the first contact plug 503.
- a semiconductor film 505 ′ formed of a silicon nitride film of a type and a second conductive film 506 ′ formed of tantalum nitride are formed in this order.
- 3 conductive films 508 ′ are formed in this order.
- the third conductive film 508 ′, the second resistance change film 507b ′, the first resistance change film 507a ′, the second conductive film 506 ′, The semiconductor film 505 ′ and the first conductive film 504 ′ are patterned.
- the upper electrode 508, the second resistance change layer 507b, the first resistance change layer 507a, the lower electrode 506 (upper electrode 506), the semiconductor layer 505, and the lower electrode 504 are formed.
- the sidewall of the first variable resistance layer 507a is oxidized by annealing the variable resistance element 50b in an oxygen atmosphere.
- the third resistance change layer 507c is formed on the side wall of the first resistance change layer 507a.
- a second interlayer insulating layer 510 is formed so as to cover the resistance change element 50b.
- a second contact plug 511 that penetrates the second interlayer insulating layer 510 and is electrically connected to the upper electrode 508 is formed.
- a second wiring 512 that is electrically connected to the second contact plug 511 is formed.
- FIG. 7 is a graph showing the relationship (initial breakdown voltage characteristics) between the amount of side wall oxidation of the resistance change element and the initial breakdown voltage in the conventional variable resistance nonvolatile memory device.
- the horizontal axis indicates the amount of oxidation of the side wall of the resistance change layer in the step shown in FIG. 6F (side wall oxidation amount), and the vertical axis indicates the magnitude of the initial breakdown voltage of the resistance change element.
- the side wall oxidation amount is an estimated amount obtained by measuring the amount of oxidation progressing in the vertical direction (the direction from the surface of the side wall of the resistance change layer to the depth direction) using an optical film thickness measuring instrument. It is.
- the actual side wall oxidation amount may be affected by various factors. As shown in FIG. 7, it can be seen that the active area of the resistance change element is reduced and the initial breakdown voltage is reduced by increasing the amount of side wall oxidation.
- FIG. 8 is a cross-sectional view of a conventional variable resistance nonvolatile memory device according to a TEM image. As shown in FIG. 8, it can be seen that the side wall of the semiconductor layer of the MSM diode element is discolored by about 20 nm and is oxidized.
- FIG. 9 is a graph showing IV characteristics of an MSM diode element of a conventional variable resistance nonvolatile memory device.
- the MSM diode element has a feature that current can flow in both directions, but the current is small in a low voltage region, and the current flows exponentially as the voltage increases.
- data indicated by black triangles is data when the sidewall of the semiconductor layer of the MSM diode element is oxidized
- data indicated by black squares is data when the sidewall of the semiconductor layer of the MSM diode element is oxidized. It is data when there is no. From a comparison of these data, it can be seen that the oxygen annealing is performed in the step shown in FIG.
- the active area of the semiconductor layer is reduced and the driving capability of the MSM diode element is reduced by oxidizing the sidewall of the semiconductor layer of the MSM diode element.
- the phenomenon in which the drive capability of the diode element is reduced due to the oxidation of the sidewall of the semiconductor layer of the MSM diode element as described above is not limited to the MSM diode element.
- the pn junction diode element and the Schottky diode element are unidirectional diodes, when the drive current decreases, the drive current is increased by another approach such as changing the concentration of the pn junction or changing the work function. It is possible to make it.
- the MSM diode is a bidirectional diode, and changing the work function changes the ratio of the on-state current to the off-state current of the drive current, so that such an approach cannot be taken. Under such circumstances, it is considered that the effect of the present invention is more effectively exhibited in the case of the MSM diode element.
- the present invention solves the above-described problems, and prevents the diode element from being oxidized when the side wall of the variable resistance layer of the variable resistance element is oxidized, and prevents the driving ability of the diode element from being lowered. Is.
- a method of manufacturing a variable resistance nonvolatile memory device includes a step of forming a diode element having a semiconductor layer over a substrate, a first electrode, a variable resistance layer, and a first electrode over the diode element.
- a step of forming a variable resistance element configured by laminating two electrodes in this order; a side wall of the semiconductor layer of the diode element; and a side wall of the variable resistance layer of the variable resistance element Forming a first oxygen barrier layer that does not cover at least a portion thereof, and oxidizing the sidewall of the variable resistance layer that is exposed without being covered by the first oxygen barrier layer.
- the side wall of the semiconductor layer of the diode element is covered with the first oxygen barrier layer, the side wall of the semiconductor layer is prevented from being oxidized when the side wall of the resistance change layer is oxidized. Can do. Therefore, it is possible to simultaneously achieve the two effects that the initial breakdown voltage can be lowered, the application time of the initial breakdown voltage can be shortened, and the driving ability of the diode element can be prevented from being lowered. can do. As a result, a sufficient current can be ensured at the time of initial breakdown and rewriting of the variable resistance element, and the operation of the variable resistance nonvolatile memory device can be stabilized.
- the first oxygen barrier layer prevents the sidewall of the semiconductor layer of the diode element from being oxidized. It may be configured.
- the sidewall of the semiconductor layer of the diode element can be prevented from being oxidized.
- the side wall of the variable resistance layer is insulated in the step of oxidizing the side wall of the variable resistance layer. May be.
- the sidewall of the resistance change layer is insulated, it is possible to reduce the initial breakdown voltage and shorten the application time of the initial breakdown voltage.
- a second oxygen barrier layer that covers the side wall is further provided. You may comprise so that the process to form may be included.
- the second oxygen barrier layer covering the side wall of the oxidized resistance change layer is formed, it is possible to prevent external oxygen from diffusing into the resistance change layer.
- variation in the side wall oxidation amount of the resistance change layer can be suppressed, and the side wall oxidation amount of the resistance change layer can be stabilized.
- the active area variation of the resistance change element narrowed down by the side wall oxidation is reduced. Therefore, it is possible to suppress variations in current density at the time of the initial breakdown, and it is possible to suppress variations in the magnitude of the initial breakdown voltage and the application time.
- the second oxygen barrier layer prevents oxygen from the outside from diffusing into the sidewall of the variable resistance layer. You may comprise.
- the second oxygen barrier layer by forming the second oxygen barrier layer, it is possible to prevent oxygen from the outside from diffusing into the sidewall of the resistance change layer.
- the second oxygen barrier layer may be configured to further cover the first oxygen barrier layer.
- the sidewall of the semiconductor layer of the diode element is doubly covered by the first oxygen barrier layer and the second oxygen barrier layer, so that external oxygen can be diffused into the semiconductor layer of the diode element. This can be prevented more reliably.
- the method further includes a step of forming an interlayer insulating layer so as to cover the diode element and the variable resistance element. May be.
- the interlayer insulating layer can be formed so as to cover the diode element and the resistance change element.
- variable resistance layer formed in the step of forming the variable resistance element is formed of a first metal oxide.
- You may comprise so that it may have 1 resistance change layer and the 2nd resistance change layer comprised with the 2nd metal oxide whose oxygen deficiency is smaller than the said 1st metal oxide.
- the resistance change layer can be configured by a laminated structure of the first resistance change layer and the second resistance change layer.
- variable resistance layer may be configured to be composed of a transition metal oxide or an aluminum oxide.
- variable resistance layer can be composed of a transition metal oxide or an aluminum oxide.
- the diode element includes a third electrode formed over the substrate, and the semiconductor layer formed over the third electrode.
- the MSM diode element may be formed by forming and forming a fourth electrode on the semiconductor layer.
- the drive current can be increased more effectively without changing the ratio of the on-current to the off-current of the drive current.
- the first electrode and the fourth electrode are configured so that the same electrode is formed as a common electrode. Also good.
- the first electrode and the fourth electrode can be shared as the same electrode.
- a variable resistance nonvolatile memory device includes a substrate, a diode element having a semiconductor layer formed over the substrate, and a resistance having a variable resistance layer formed over the diode element.
- a variable element wherein the variable resistance element includes: a first electrode; a second electrode disposed opposite to the first electrode; and the first electrode and the second electrode.
- a first oxygen barrier layer that covers the resistance change layer disposed between the semiconductor layer and a side wall of the semiconductor layer of the diode element and does not cover at least a part of the side wall of the resistance change layer of the resistance change element; And the region of the side wall of the variable resistance layer of the variable resistance element that is not covered with the first oxygen barrier layer is insulated.
- the side wall of the semiconductor layer of the diode element is covered with the first oxygen barrier layer, the side wall of the semiconductor layer is prevented from being oxidized when the side wall of the resistance change layer is oxidized. Can do. Accordingly, it is possible to prevent a reduction in the driving capability of the diode element. Furthermore, the active area of the variable resistance element is reduced by oxidizing the side wall of the variable resistance layer. As a result, the leakage current flowing from the variable resistance element to the outside is reduced, so that the initial breakdown voltage can be lowered and the application time of the initial breakdown voltage can be shortened.
- the first oxygen barrier layer is configured to prevent the sidewall of the semiconductor layer of the diode element from being oxidized. Also good.
- the first oxygen barrier layer can prevent the side wall of the semiconductor layer of the diode element from being oxidized.
- variable resistance element further includes a second oxygen barrier layer that covers the oxidized sidewall of the variable resistance layer. May be.
- the second oxygen barrier layer that covers the side wall of the oxidized resistance change layer is formed, it is possible to prevent external oxygen from diffusing into the resistance change layer.
- variation in the side wall oxidation amount of the resistance change layer can be suppressed, and the side wall oxidation amount of the resistance change layer can be stabilized.
- the active area variation of the resistance change element narrowed down by the side wall oxidation is reduced. Therefore, it is possible to suppress variations in current density at the time of the initial breakdown, and it is possible to suppress variations in the magnitude of the initial breakdown voltage and the application time.
- the second oxygen barrier layer is configured to prevent external oxygen from diffusing into the sidewall of the variable resistance layer. May be.
- the second oxygen barrier layer can prevent oxygen from the outside from diffusing into the sidewall of the resistance change layer.
- the second oxygen barrier layer may be configured to further cover the first oxygen barrier layer.
- the sidewall of the semiconductor layer of the diode element is doubly covered by the first oxygen barrier layer and the second oxygen barrier layer, so that external oxygen can be diffused into the semiconductor layer of the diode element. This can be prevented more reliably.
- an oxide layer may be formed on the surface of the first oxygen barrier layer.
- the oxidation layer is formed on the surface of the first oxygen barrier layer by oxidizing the side wall of the resistance change layer.
- variable resistance layer may be formed of a transition metal oxide or an aluminum oxide.
- variable resistance layer can be composed of a transition metal oxide or an aluminum oxide.
- variable resistance layer may be configured to include any of transition metal oxides of tantalum, hafnium, and zirconium.
- the transition metal oxide of any one of tantalum, hafnium, and zirconium is a material that has excellent retention characteristics and can operate at high speed. Therefore, even when the variable resistance layer is made of a material that requires an initial breakdown, the initial breakdown voltage characteristics can be extremely stabilized.
- the variable resistance layer of the variable resistance element includes a first variable resistance layer formed of a first metal oxide, and the first variable resistance layer. And a second resistance change layer made of a second metal oxide having a lower degree of oxygen deficiency than that of the metal oxide.
- the resistance change layer can be configured by a laminated structure of the first resistance change layer and the second resistance change layer.
- the diode element includes a third electrode formed over the substrate, and a fourth electrode disposed opposite to the third electrode. And an MSM diode element having the semiconductor layer disposed between the third electrode and the fourth electrode.
- the drive current can be increased more effectively without changing the ratio of the on-current to the off-current of the drive current.
- the first electrode and the fourth electrode may be configured to use the same electrode as a common electrode.
- the first electrode and the fourth electrode can be shared as the same electrode.
- variable resistance nonvolatile memory device and a manufacturing method thereof according to one embodiment of the present invention will be described with reference to the drawings.
- an MSM diode element is described as an example of the diode element.
- the diode element is not limited to the MSM diode element.
- the variable resistance nonvolatile memory device may be configured by using other diode elements, such as a pn junction diode element or a Schottky diode element, which are made of a material that easily oxidizes the rectifying layer in the diode element.
- FIG. 1 is a cross-sectional view showing the configuration of the variable resistance nonvolatile memory device according to the first embodiment.
- the illustrated variable resistance nonvolatile memory device 10 includes a substrate 100, a first wiring 101, a first interlayer insulating layer 102, a first contact plug 103, an MSM diode element 10a, a resistance change element 10b, and a second interlayer.
- An insulating layer 110, a second contact plug 111, and a second wiring 112 are included.
- the first wiring 101 is formed on the substrate 100 on which transistors and the like are formed.
- the first wiring 101 is made of, for example, copper or aluminum.
- the first interlayer insulating layer 102 is formed on the substrate 100 so as to cover the first wiring 101.
- the first interlayer insulating layer 102 is made of, for example, silicon oxide.
- the first contact plug 103 is formed so as to penetrate the first interlayer insulating layer 102.
- the first contact plug 103 is electrically connected to the first wiring 101.
- the first contact plug 103 is made of, for example, tungsten or copper.
- the MSM diode element 10a is configured by laminating a lower electrode 104 (which constitutes a third electrode), a semiconductor layer 105 and an upper electrode 106 (which constitutes a fourth electrode) in this order.
- the lower electrode 104 is electrically connected to the first contact plug 103.
- the upper electrode 106 is disposed to face the lower electrode 104.
- the semiconductor layer 105 is disposed between the lower electrode 104 and the upper electrode 106.
- Each of the lower electrode 104 and the upper electrode 106 is made of, for example, tantalum nitride (TaN).
- the semiconductor layer 105 is composed of, for example, a nitrogen-deficient silicon nitride film (SiN x ).
- the variable resistance nonvolatile memory device 10 is characterized by covering the side wall (outer periphery) of the semiconductor layer 105 of the MSM diode element 10a and the first variable resistance layer 107a (described later).
- the first oxygen barrier layer 109a is formed so as not to cover at least a part of the side wall.
- the first oxygen barrier layer 109 a functions as an oxygen barrier that prevents external oxygen from diffusing into the semiconductor layer 105 and functions as an insulator that prevents leakage current from flowing through the sidewall of the semiconductor layer 105. You need to have
- the first oxygen barrier layer 109a is made of a material having both functions described above, for example, silicon nitride (SiN) or silicon nitride oxide (SiON).
- the resistance change element 10b is configured by laminating a lower electrode 106 (which constitutes a first electrode), a resistance change layer 107 and an upper electrode 108 (which constitutes a second electrode) in this order.
- the lower electrode 106 of the resistance change element 10b is shared with the upper electrode 106 of the MSM diode element 10a.
- the upper electrode 108 is disposed to face the lower electrode 106.
- the resistance change layer 107 is disposed between the lower electrode 106 and the upper electrode 108.
- the upper electrode 108 is made of a noble metal such as platinum (Pt), iridium (Ir), or palladium (Pd).
- the resistance change layer 107 is a layer that is interposed between the lower electrode 106 and the upper electrode 108, and whose resistance value reversibly changes based on an electrical signal applied between the lower electrode 106 and the upper electrode 108. .
- the resistance change layer 107 is a layer that reversibly transitions between a high resistance state and a low resistance state according to the polarity of a voltage applied between the lower electrode 106 and the upper electrode 108, for example.
- the resistance change layer 107 is configured by stacking at least two layers of a first resistance change layer 107 a connected to the lower electrode 106 and a second resistance change layer 107 b connected to the upper electrode 108.
- the first resistance change layer 107a is composed of an oxygen-deficient first metal oxide
- the second resistance change layer 107b is a second metal oxide having a lower degree of oxygen deficiency than the first metal oxide. It consists of things.
- a minute local region in which the degree of oxygen deficiency reversibly changes according to the application of the electric pulse is formed.
- the local region is considered to include a filament composed of oxygen defect sites.
- the first resistance change layer 107a can be made of, for example, a first transition metal oxide containing oxygen-deficient tantalum oxide (TaO x , 0 ⁇ x ⁇ 2.5) as a main component.
- the second resistance change layer 107b can be made of, for example, a second transition metal oxide containing oxygen-deficient tantalum oxide (TaO y , x ⁇ y) as a main component.
- the first resistance change layer 107a and the second resistance change layer 107b are formed of a transition metal oxide other than tantalum oxide
- the first resistance change layer 107a and the second resistance change layer 107b are Each of them is made of a material having a low oxygen deficiency (ie, high resistance) from a stoichiometric composition exhibiting insulating properties.
- a material constituting the resistance change layer 107 for example, an oxide of hafnium (Hf) or zirconium (Zr) can be used in addition to the oxide of tantalum.
- Oxygen deficiency means the stoichiometric composition of metal oxide (if there are multiple stoichiometric compositions, the stoichiometric composition having the highest resistance value among them). This refers to the proportion of oxygen that is deficient with respect to the amount of oxygen that forms the oxide. Stoichiometric metal oxides are more stable and have higher resistance values than other metal oxides.
- the oxide having the stoichiometric composition according to the above definition is Ta 2 O 5 , and can be expressed as TaO 2.5 .
- the oxygen excess metal oxide has a negative oxygen deficiency.
- the oxygen deficiency is described as including a positive value, 0, and a negative value.
- An oxide with a low degree of oxygen deficiency has a high resistance value because it is closer to a stoichiometric oxide, and an oxide with a high degree of oxygen deficiency has a low resistance value because it is closer to the metal constituting the oxide.
- the “oxygen content” is the ratio of oxygen atoms to the total number of atoms.
- the oxygen content of Ta 2 O 5 is the ratio of oxygen atoms to the total number of atoms (O / (Ta + O)), which is 71.4 atm%. Therefore, the oxygen-deficient tantalum oxide has an oxygen content greater than 0 and less than 71.4 atm%.
- the oxygen content has a corresponding relationship with the degree of oxygen deficiency. That is, when the oxygen content of the second metal oxide is greater than the oxygen content of the first metal oxide, the oxygen deficiency of the second metal oxide is greater than the oxygen deficiency of the first metal oxide. small.
- the metal constituting the resistance change layer 107 may be a metal other than tantalum.
- a metal constituting the resistance change layer 107 a transition metal or aluminum (Al) can be used. That is, the resistance change layer 107 can be made of a transition metal oxide or aluminum oxide.
- the transition metal tantalum (Ta), titanium (Ti), hafnium (Hf), zirconium (Zr), niobium (Nb), tungsten (W), nickel (Ni), or the like can be used. Since transition metals can take a plurality of oxidation states, different resistance states can be realized by oxidation-reduction reactions.
- the composition of the first metal oxide is HfO x
- x is 0.9 or more and 1.6 or less
- the composition of the second metal oxide is HfO x.
- the resistance value of the resistance change layer 107 can be stably changed at high speed.
- the thickness of the second metal oxide may be 3 to 4 nm.
- the composition of the first metal oxide is ZrO x
- x is 0.9 or more and 1.4 or less
- the composition of the second metal oxide is ZrO x.
- the thickness of the second metal oxide may be 1 to 5 nm.
- the second metal oxide may have a lower degree of oxygen deficiency than the first metal oxide, that is, may have a higher resistance.
- the standard electrode potential of the second metal may be lower than the standard electrode potential of the first metal.
- the standard electrode potential represents a characteristic that the higher the value is, the more difficult it is to oxidize. Thereby, an oxidation-reduction reaction easily occurs in the second metal oxide having a relatively low standard electrode potential.
- the resistance change phenomenon is caused by a change in the filament (conducting path) caused by an oxidation-reduction reaction in a minute local region formed in the second metal oxide having a high resistance. Degree) is considered to change.
- metal oxide Al 2 O 3
- Al 2 O 3 aluminum oxide
- oxygen-deficient tantalum oxide (TaO x ) may be used for the first metal oxide
- aluminum oxide (Al 2 O 3 ) may be used for the second metal oxide.
- the resistance change phenomenon in the resistance change layer 107 having the laminated structure is caused by a redox reaction in a minute local region formed in the second metal oxide having a high resistance, and a filament (conducting path) in the local region. ) Changes, the resistance value is considered to change.
- the upper electrode 108 connected to the second metal oxide having a lower oxygen deficiency is, for example, a metal constituting the second metal oxide, such as platinum (Pt), iridium (Ir), palladium (Pd), etc. And a material having a higher standard electrode potential than the material constituting the lower electrode 106.
- the lower electrode 106 connected to the first metal oxide having a higher degree of oxygen deficiency is, for example, tungsten (W), nickel (Ni), tantalum (Ta), titanium (Ti), aluminum (Al). , Tantalum nitride (TaN), titanium nitride (TiN), or the like, may be made of a material having a lower standard electrode potential than the metal constituting the first metal oxide.
- the standard electrode potential represents a characteristic that the higher the value is, the more difficult it is to oxidize.
- the standard electrode potential V2 of the upper electrode 108, the standard electrode potential Vr2 of the metal constituting the second metal oxide, the standard electrode potential Vr1 of the metal constituting the first metal oxide, and the standard electrode potential of the lower electrode 106 between the V1, V r2 ⁇ V 2, may be satisfied and V 1 ⁇ V 2 the relationship. Furthermore, V2> Vr2 and Vr1 ⁇ V1 may be satisfied.
- a third resistance change layer 107c is formed on the side wall (outer periphery) of the first resistance change layer 107a.
- the third resistance change layer 107c is composed of a third transition metal oxide mainly containing oxygen-deficient tantalum oxide (TaO z , x ⁇ z). That is, the oxygen deficiency of the third transition metal oxide constituting the third resistance change layer 107c is configured to be smaller than the oxygen deficiency of the transition metal oxide constituting the first resistance change layer 107a. .
- the third variable resistance layer 107c and the first variable resistance layer 107a are in contact with the lower surface of the second variable resistance layer 107b.
- the third resistance change layer 107c having a relatively high resistance value is arranged on the side wall of the first resistance change layer 107a having a relatively low resistance value, the planar direction of the first resistance change layer 107a Is smaller than the area of the electrode region of the upper electrode 108.
- the density of current flowing from the first resistance change layer 107a to the second resistance change layer 107b increases, and a conductive path is easily formed in the second resistance change layer 107b.
- the initial breakdown voltage of the variable resistance nonvolatile memory device 10 can be reduced and the application time of the initial breakdown voltage can be shortened.
- a second interlayer insulating layer 110 is formed so as to cover the MSM diode element 10a and the variable resistance element 10b.
- the second interlayer insulating layer 110 is formed so as to indirectly cover the MSM diode element 10a via the first oxygen barrier layer 109a.
- a second contact plug 111 is formed so as to penetrate the second interlayer insulating layer 110, and the second contact plug 111 is electrically connected to the upper electrode 108 of the resistance change element 10b. Further, a second wiring 112 that is electrically connected to the second contact plug 111 is formed.
- variable resistance nonvolatile memory device 10 Next, a method for manufacturing the variable resistance nonvolatile memory device 10 according to this embodiment will be described.
- 2A to 2I are cross-sectional views illustrating the method of manufacturing the variable resistance nonvolatile semiconductor memory device according to the first embodiment.
- a substrate 100 on which transistors and lower layer wirings (not shown) are formed is prepared (step of preparing a substrate).
- a conductive layer made of aluminum is formed on the substrate 100, and the first wiring 101 is formed by patterning the conductive layer.
- the surface of the insulating film is planarized to form the first interlayer insulating layer 102 (interlayer insulating layer). Forming step).
- a first contact plug 103 that penetrates through the first interlayer insulating layer 102 and is electrically connected to the first wiring 101 is formed.
- a first conductive film 104 ′ made of tantalum nitride is formed on the first interlayer insulating layer 102 so as to cover the first contact plug 103, and a nitrogen deficiency.
- a semiconductor film 105 ′ made of a silicon nitride film and a second conductive film 106 ′ made of tantalum nitride are formed in this order.
- the third conductive film 108 ' is formed in this order.
- the third conductive film 108 ′, the second resistance change film 107b ′, the first resistance change film 107a ′, the second conductive film 106 ′, The semiconductor film 105 ′ and the first conductive film 104 ′ are patterned.
- the MSM diode element 10a in which the upper electrode 106, the semiconductor layer 105, and the lower electrode 104 are laminated in this order is formed on the substrate 100 (step of forming the MSM diode element).
- variable resistance element 10b in which the upper electrode 108, the second variable resistance layer 107b, the first variable resistance layer 107a, and the lower electrode 106 are stacked in this order is formed on the MSM diode element 10a (resistance variable element). Forming step).
- a first oxygen barrier film 109a ' is formed on the first interlayer insulating layer 102 so as to cover the MSM diode element 10a and the resistance change element 10b.
- the first oxygen barrier film 109a ' is made of silicon nitride (SiN), silicon nitride oxide (SiON), or the like.
- a CVD (Chemical Vapor Deposition) method or an ALD (Atomic Layer Deposition) method can be used so that the film is sufficiently formed at the end of the variable resistance nonvolatile memory device 10.
- the entire surface of the first oxygen barrier film 109a ′ is etched back, so that the first oxygen barrier film on the first interlayer insulating layer 102 and the upper electrode 108 of the resistance change element 10b is obtained. 109a 'is removed.
- the sidewall-shaped first oxygen barrier layer 109a is formed so as to cover the sidewall of the semiconductor layer 105 of the MSM diode element 10a (step of forming the first oxygen barrier layer).
- the side wall of the semiconductor layer 105 is completely covered with the first oxygen barrier layer 109a, and at least a part of the side wall of the first resistance change layer 107a is not covered with the first oxygen barrier layer 109a.
- the top position of the first oxygen barrier layer 109a is adjusted by the etching time so as to be exposed.
- a fluorine-based gas that can secure an etching rate and can secure a selection ratio with the metal material forming the upper electrode 108 is used. Is possible.
- the first oxygen barrier layer 109a is formed so as to cover the entire sidewall of the semiconductor layer 105 in order to prevent the semiconductor layer 105 from being oxidized in a manufacturing process (step shown in FIG. 2H) described later. Is done. Further, when the upper electrode 106 of the MSM diode element 10 a is made of a material that is easily oxidized, the first oxygen barrier layer 109 a includes the semiconductor layer 105 and the upper electrode in addition to the entire sidewall of the semiconductor layer 105. It can also be formed to cover up to the interface with 106.
- the first oxygen barrier layer 109a is provided on the side wall of the first resistance change layer 107a. Is formed so as not to cover at least a part thereof. The first oxygen barrier layer 109a can also be formed so as not to cover the entire side wall of the first variable resistance layer 107a.
- annealing is performed at a temperature of 300 to 450 ° C. in an oxygen atmosphere with the semiconductor layer 105 of the MSM diode element 10a covered with the first oxygen barrier layer 109a.
- the third resistance change layer 107c is formed by oxidizing the side wall of the resistance change layer 107a (step of oxidizing the side wall of the resistance change layer).
- the side wall of the first resistance change layer 107a is insulated by oxidation.
- the second resistance change layer 107b is hardly oxidized when it is close to the insulating layer from the beginning.
- the first oxygen barrier layer 109a functions as an oxygen barrier, so that the sidewall of the semiconductor layer 105 of the MSM diode element 10a is not oxidized. Note that an oxide layer (not shown) is formed on the surface of the first oxygen barrier layer 109a by the above-described oxidation treatment.
- the second interlayer insulating layer 110 is formed so as to cover the MSM diode element 10a and the resistance change element 10b (step of forming an interlayer insulating layer).
- a second contact plug 111 that penetrates the second interlayer insulating layer 110 and is electrically connected to the upper electrode 108 is formed.
- a second wiring 112 that is electrically connected to the second contact plug 111 is formed.
- the variable resistance nonvolatile memory device 10 according to the present embodiment is manufactured.
- the side wall of the semiconductor layer 105 of the MSM diode element 10a is covered with the first oxygen barrier layer 109a, when the side wall of the first variable resistance layer 107a is oxidized, The side walls can be prevented from oxidizing. Therefore, it is possible to reduce the initial breakdown voltage and to shorten the application time of the initial breakdown voltage, and to prevent the drive capability of the MSM diode element 10a from being lowered. It can be realized at the same time. In particular, it can greatly contribute to miniaturization and capacity increase of a cross-point memory using the MSM diode element 10a.
- FIG. 3 is a cross-sectional view showing a configuration of the variable resistance nonvolatile memory device according to the second embodiment.
- the second variable resistance layer 107b and the third variable resistance layer A second oxygen barrier layer 109b is formed so as to cover each side wall (outer peripheral portion) of the resistance change layer 107c.
- the second oxygen barrier layer 109b is made of a material having a function as an oxygen barrier that prevents external oxygen from diffusing into the resistance change layer 107, such as silicon nitride (SiN) or silicon nitride oxide (SiON). Composed.
- variable resistance nonvolatile memory device 20 of this embodiment Next, a manufacturing method of the variable resistance nonvolatile memory device 20 of this embodiment will be described.
- 4A to 4D are cross-sectional views illustrating a part of the method of manufacturing the variable resistance nonvolatile memory device according to the second embodiment.
- annealing is performed at a temperature of 300 to 450 ° C. in an oxygen atmosphere with the semiconductor layer 105 of the MSM diode element 10a covered with the first oxygen barrier layer 109a.
- the third resistance change layer 107c is formed by oxidizing the side wall of the resistance change layer 107a (step of oxidizing the side wall of the resistance change layer).
- the side wall of the first resistance change layer 107a is insulated by oxidation.
- the second resistance change layer 107b is hardly oxidized when it is close to the insulating layer from the beginning.
- the first oxygen barrier layer 109a functions as an oxygen barrier, the side wall of the semiconductor layer 105 of the MSM diode element 10a is not oxidized when the oxidation process is performed in the process shown in FIG. 2G. Note that an oxide layer (not shown) is formed on the surface of the first oxygen barrier layer 109a by the above-described oxidation treatment.
- a second oxygen layer is formed on the first interlayer insulating layer 102 so as to cover the stacked structure of the MSM diode element 10a and the resistance change element 10b and the first oxygen barrier layer 109a.
- a barrier film 109b ′ is formed.
- the second oxygen barrier film 109b ' is made of silicon nitride (SiN), silicon nitride oxide (SiON), or the like.
- a CVD method or an ALD method can be used so that the film is sufficiently formed on the end portion of the variable resistance nonvolatile memory device 20.
- the entire surface of the second oxygen barrier film 109b ′ is etched back, whereby the second interlayer insulating layer 102 and the second electrode disposed on the upper electrode 108 of the resistance change element 10b are obtained.
- the oxygen barrier film 109b ′ is removed.
- the sidewall-shaped second oxygen barrier layer 109b is formed so as to cover the sidewalls of the second resistance change layer 107b and the third resistance change layer 107c on the first oxygen barrier layer 109a. Is formed (step of forming a second oxygen barrier layer).
- the top position of the second oxygen barrier layer 109b is etched so that the side walls of the second variable resistance layer 107b and the third variable resistance layer 107c are covered with the second oxygen barrier layer 109b. Adjust with time.
- a fluorine-based gas that can secure an etching rate and can secure a selection ratio with the metal material that forms the upper electrode 108 can be used. is there.
- the second oxygen barrier layer 109b can be formed so as to completely cover the side wall of the third resistance change layer 107c. Further, the second oxygen barrier layer 109b can be formed so as to completely cover the side walls of the second variable resistance layer 107b and the third variable resistance layer 107c.
- the second interlayer insulating layer 110 is formed so as to cover the MSM diode element 10a and the resistance change element 10b (step of forming an interlayer insulating layer). Thereafter, a second contact plug 111 that penetrates the second interlayer insulating layer 110 and is electrically connected to the upper electrode 108 is formed. After that, a second wiring 112 that is electrically connected to the second contact plug 111 is formed. As described above, the variable resistance nonvolatile memory device 20 according to the present embodiment is manufactured.
- the following effects can be obtained. That is, since the second oxygen barrier layer 109b is formed so as to cover the side walls of the second variable resistance layer 107b and the third variable resistance layer 107c, the external oxygen is transferred to the second interlayer layer. Diffusion to the resistance change layer 107 through the insulating layer 110 or the like can be prevented. Thereby, variation in the amount of side wall oxidation of the resistance change layer 107 can be suppressed, and the amount of side wall oxidation of the resistance change layer 107 can be stabilized. When the side wall oxidation amount of the resistance change layer 107 is stabilized, variation in the active area of the resistance change element 10b narrowed down by the side wall oxidation is reduced. Therefore, it is possible to suppress variations in current density at the time of the initial breakdown, and it is possible to suppress variations in the magnitude of the initial breakdown voltage and the application time.
- the second oxygen barrier layer 109b can also be formed so as to cover the first oxygen barrier layer 109a.
- the semiconductor layer 105 of the MSM diode element 10a is doubly covered with the first oxygen barrier layer 109a and the second oxygen barrier layer 109b. Therefore, in the manufacturing process after the step shown in FIG. 4C, it is possible to more reliably prevent external oxygen from diffusing into the semiconductor layer 105 of the MSM diode element 10a.
- Embodiment 1 and 2 of this invention were demonstrated, this invention is not limited to the said Embodiment 1 and 2, Various improvement, a change, correction, and within the range which does not deviate from the meaning. Combinations are possible.
- the upper electrode (fourth electrode) of the MSM diode element and the lower electrode (first electrode) of the resistance change element are formed using the same electrode as a common electrode. However, they can be configured separately. In other words, the upper electrode of the MSM diode element and the lower electrode of the resistance change element may be provided separately. Also in this case, as described in Embodiments 1 and 2, the first oxygen barrier layer 109a may be formed so as not to cover at least part of the side wall of the first variable resistance layer 107a. .
- variable resistance layer is configured by a laminated structure of the first variable resistance layer and the second variable resistance layer.
- variable resistance layer may be configured by a single layer structure. It is.
- the present invention provides a variable resistance nonvolatile semiconductor memory device manufacturing method and a variable resistance nonvolatile semiconductor memory device, and is useful for various electronic devices using a nonvolatile memory.
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Abstract
Description
まず、本発明の実施の形態について説明する前に、本発明者が見出した、従来の抵抗変化型不揮発性記憶装置において生じる問題点について説明する。なお、以下の説明は、本発明を理解する上で一助となるものであるが、以下の種々の条件等は本発明を限定するものではない。
(抵抗変化型不揮発性記憶装置の構成)
図1は、実施の形態1に係る抵抗変化型不揮発性記憶装置の構成を示す断面図である。図示の抵抗変化型不揮発性記憶装置10は、基板100、第1の配線101、第1の層間絶縁層102、第1のコンタクトプラグ103、MSMダイオード素子10a、抵抗変化素子10b、第2の層間絶縁層110、第2のコンタクトプラグ111及び第2の配線112を有している。
次に、本実施の形態に係る抵抗変化型不揮発性記憶装置10の製造方法について説明する。図2A~図2Iは、実施の形態1に係る抵抗変化型不揮発性半導体記憶装置の製造方法を示す断面図である。
(抵抗変化型不揮発性記憶装置の構成)
図3は、実施の形態2に係る抵抗変化型不揮発性記憶装置の構成を示す断面図である。図3に示すように、本実施形態の抵抗変化型不揮発性記憶装置20では、実施の形態1で説明した第1の酸素バリア層109aに加えて、第2の抵抗変化層107b及び第3の抵抗変化層107cの各々の側壁(外周部)を被覆するようにして、第2の酸素バリア層109bが形成されている。第2の酸素バリア層109bは、外部からの酸素が抵抗変化層107に拡散するのを防止する酸素バリアとしての機能を有する材料、例えば、窒化シリコン(SiN)又は窒化酸化シリコン(SiON)等で構成される。
次に、本実施形態の抵抗変化型不揮発性記憶装置20の製造方法について説明する。図4A~図4Dは、実施の形態2に係る抵抗変化型不揮発性記憶装置の製造方法の一部を示す断面図である。
10a,50a MSMダイオード素子
10b,50b 抵抗変化素子
100,500 基板
101,501 第1の配線
102,502 第1の層間絶縁層
103,503 第1のコンタクトプラグ
104 下部電極(第3の電極)
104’,504’ 第1の導電膜
105,505 半導体層
105’,505’ 半導体膜
106 上部電極(下部電極、第1の電極、第4の電極)
106’,506’ 第2の導電膜
107,507 抵抗変化層
107a,507a 第1の抵抗変化層
107a’,507a’ 第1の抵抗変化膜
107b,507b 第2の抵抗変化層
107b’,507b’ 第2の抵抗変化膜
107c,507c 第3の抵抗変化層
108 上部電極(第2の電極)
108’,508’ 第3の導電膜
109a 第1の酸素バリア層
109a’ 第1の酸素バリア膜
109b 第2の酸素バリア層
109b’ 第2の酸素バリア膜
110,510 第2の層間絶縁層
111,511 第2のコンタクトプラグ
112,512 第2の配線
504 下部電極
505a 側壁
506 上部電極(下部電極)
508 上部電極
Claims (22)
- 基板上に半導体層を有するダイオード素子を形成する工程と、
前記ダイオード素子上に、第1の電極、抵抗変化層及び第2の電極がこの順に積層されることにより構成された抵抗変化素子を形成する工程と、
前記ダイオード素子の前記半導体層の側壁を被覆し、且つ、前記抵抗変化素子の前記抵抗変化層の側壁の少なくとも一部を被覆しない第1の酸素バリア層を形成する工程と、
前記第1の酸素バリア層により被覆されずに露出された前記抵抗変化層の前記側壁を酸化する工程と、を含む
抵抗変化型不揮発性記憶装置の製造方法。 - 前記第1の酸素バリア層は、前記ダイオード素子の前記半導体層の前記側壁が酸化されることを防止する
請求項1に記載の抵抗変化型不揮発性記憶装置の製造方法。 - 前記抵抗変化層の前記側壁を酸化する工程において、前記抵抗変化層の前記側壁が絶縁化される
請求項1又は2に記載の抵抗変化型不揮発性記憶装置の製造方法。 - さらに、前記抵抗変化層の前記側壁を酸化する工程の後で、当該側壁を被覆する第2の酸素バリア層を形成する工程を含む
請求項1~3のいずれか1項に記載の抵抗変化型不揮発性記憶装置の製造方法。 - 前記第2の酸素バリア層は、外部からの酸素が前記抵抗変化層の前記側壁に拡散することを防止する
請求項4に記載の抵抗変化型不揮発性記憶装置の製造方法。 - 前記第2の酸素バリア層は、さらに、前記第1の酸素バリア層を被覆する
請求項4又は5に記載の抵抗変化型不揮発性記憶装置の製造方法。 - さらに、前記ダイオード素子及び前記抵抗変化素子を被覆するように、層間絶縁層を形成する工程を含む
請求項1~6のいずれか1項に記載の抵抗変化型不揮発性記憶装置の製造方法。 - 前記抵抗変化素子を形成する工程において形成される前記抵抗変化層は、第1の金属酸化物で構成される第1の抵抗変化層と、前記第1の金属酸化物よりも酸素不足度が小さい第2の金属酸化物で構成される第2の抵抗変化層と、を有する
請求項1~7のいずれか1項に記載の抵抗変化型不揮発性記憶装置の製造方法。 - 前記抵抗変化層は、遷移金属酸化物又はアルミニウム酸化物で構成されている
請求項1~8のいずれか1項に記載の抵抗変化型不揮発性記憶装置の製造方法。 - 前記ダイオード素子は、
前記基板上に第3の電極を形成し、
前記第3の電極の上に前記半導体層を形成し、
前記半導体層の上に第4の電極を形成することで形成されたMSMダイオード素子である
請求項1~9のいずれか1項に記載の抵抗変化型不揮発性記憶装置の製造方法。 - 前記第1の電極と前記第4の電極とは、同一の電極を共用電極として形成される
請求項10に記載の抵抗変化型不揮発性記憶装置の製造方法。 - 基板と、
前記基板上に形成された、半導体層を有するダイオード素子と、
前記ダイオード素子上に形成された、抵抗変化層を有する抵抗変化素子と、を備え、
前記抵抗変化素子は、
第1の電極と、
前記第1の電極に対向して配置された第2の電極と、
前記第1の電極と前記第2の電極との間に配置された前記抵抗変化層と、
前記ダイオード素子の前記半導体層の側壁を被覆し、且つ、前記抵抗変化素子の前記抵抗変化層の側壁の少なくとも一部を被覆しない第1の酸素バリア層と、を備え、
前記抵抗変化素子の前記抵抗変化層の前記側壁のうち、前記第1の酸素バリア層に被覆されていない領域が絶縁化されている
抵抗変化型不揮発性記憶装置。 - 前記第1の酸素バリア層は、前記ダイオード素子の前記半導体層の前記側壁が酸化されることを防止する
請求項12に記載の抵抗変化型不揮発性記憶装置。 - 前記抵抗変化素子は、さらに、酸化された前記抵抗変化層の前記側壁を被覆する第2の酸素バリア層を備える
請求項12又は13に記載の抵抗変化型不揮発性記憶装置。 - 前記第2の酸素バリア層は、外部からの酸素が前記抵抗変化層の前記側壁に拡散することを防止する
請求項14に記載の抵抗変化型不揮発性記憶装置。 - 前記第2の酸素バリア層は、さらに、前記第1の酸素バリア層を被覆する
請求項14又は15に記載の抵抗変化型不揮発性記憶装置。 - 前記第1の酸素バリア層の表面には、酸化層が形成されている
請求項12~16のいずれか1項に記載の抵抗変化型不揮発性記憶装置。 - 前記抵抗変化層は、遷移金属酸化物又はアルミニウム酸化物で構成されている
請求項12~17のいずれか1項に記載の抵抗変化型不揮発性記憶装置。 - 前記抵抗変化層は、タンタル、ハフニウム及びジルコニウムのいずれかの遷移金属酸化物で構成されている
請求項18に記載の抵抗変化型不揮発性記憶装置。 - 前記抵抗変化素子の前記抵抗変化層は、第1の金属酸化物で構成される第1の抵抗変化層と、前記第1の金属酸化物よりも酸素不足度が小さい第2の金属酸化物で構成される第2の抵抗変化層と、を有する
請求項12~17のいずれか1項に記載の抵抗変化型不揮発性記憶装置。 - 前記ダイオード素子は、
前記基板上に形成された第3の電極と、
前記第3の電極に対向して配置された第4の電極と、
前記第3の電極と前記第4の電極との間に配置された前記半導体層と、を有するMSMダイオード素子である
請求項12~20のいずれか1項に記載の抵抗変化型不揮発性記憶装置。 - 前記第1の電極と前記第4の電極とは、同一の電極を共用電極とする
請求項21に記載の抵抗変化型不揮発性記憶装置。
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