WO2004090985A1 - 半導体装置の製造方法 - Google Patents
半導体装置の製造方法 Download PDFInfo
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- WO2004090985A1 WO2004090985A1 PCT/JP2003/004264 JP0304264W WO2004090985A1 WO 2004090985 A1 WO2004090985 A1 WO 2004090985A1 JP 0304264 W JP0304264 W JP 0304264W WO 2004090985 A1 WO2004090985 A1 WO 2004090985A1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02109—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates
- H01L21/02112—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer
- H01L21/02123—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer the material containing silicon
- H01L21/02126—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer the material containing silicon the material containing Si, O, and at least one of H, N, C, F, or other non-metal elements, e.g. SiOC, SiOC:H or SiONC
- H01L21/0214—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer the material containing silicon the material containing Si, O, and at least one of H, N, C, F, or other non-metal elements, e.g. SiOC, SiOC:H or SiONC the material being a silicon oxynitride, e.g. SiON or SiON:H
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02109—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates
- H01L21/02112—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer
- H01L21/02123—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer the material containing silicon
- H01L21/0217—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer the material containing silicon the material being a silicon nitride not containing oxygen, e.g. SixNy or SixByNz
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10B—ELECTRONIC MEMORY DEVICES
- H10B53/00—Ferroelectric RAM [FeRAM] devices comprising ferroelectric memory capacitors
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10B—ELECTRONIC MEMORY DEVICES
- H10B53/00—Ferroelectric RAM [FeRAM] devices comprising ferroelectric memory capacitors
- H10B53/30—Ferroelectric RAM [FeRAM] devices comprising ferroelectric memory capacitors characterised by the memory core region
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02109—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates
- H01L21/02112—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer
- H01L21/02123—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer the material containing silicon
- H01L21/02164—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer the material containing silicon the material being a silicon oxide, e.g. SiO2
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02107—Forming insulating materials on a substrate
- H01L21/02225—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer
- H01L21/02227—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a process other than a deposition process
- H01L21/02252—Forming insulating materials on a substrate characterised by the process for the formation of the insulating layer formation by a process other than a deposition process formation by plasma treatment, e.g. plasma oxidation of the substrate
Definitions
- the present invention relates to a method for manufacturing a semiconductor device suitable for manufacturing a ferroelectric memory.
- Ferroelectric random access memory (FeRAM) is used as nonvolatile semiconductor memory.
- the structure of the ferroelectric capacitor provided in the ferroelectric memory is mainly classified into a stack structure and a planar structure.
- the ferroelectric capacitors having the planar structure are mass-produced.
- a contact plug is provided directly under the lower electrode of the ferroelectric capacitor to ensure conduction with the substrate (diffusion layer).
- tungsten or polysilicon is usually used as a material for the contact plug.
- the contact resistance of a W plug is usually 2-3 ⁇ , while the contact resistance of a plug formed of polysilicon is 1-21 ⁇ .
- ferroelectric memories are often mixed with logic circuits.
- security-related chips that require authentication such as IC cards
- IC cards are examples.
- a W plug is used for the mouthpiece circuit. For this reason, the resistance of the W plug is used as a parameter in the simulation performed when designing a logic circuit.
- a crystal thermal anneal is a RTA (Rapid Thermal Annealing) at 75 0 for 60 seconds.
- the recovery anneal is an anneal in the furnace at 65 ° C. for 60 minutes.
- W plugs have the property of oxidizing at very high rates and at low temperatures. Also, once the oxidation of a part of the W plug starts, the oxidization spreads over the entire W plug. For this reason, contact failure is likely to occur, and the yield is likely to decrease. In order to suppress oxidation of the W plug, it is preferable to lower the annealing temperature. As described above, various anneals are required to improve the performance of the ferroelectric capacitor. On the other hand, to avoid an increase in the contact resistance of the W plug immediately below the capacitor, the anneal temperature must be reduced. Need to be lower.
- the aspect ratio of the contact hole will increase, and it will be difficult to perform etching when forming the contact hole and bury a glue film in the contact hole.
- Patent Document 1
- Patent Document 2
- An object of the present invention is to provide a method of manufacturing a semiconductor device capable of suppressing an increase in contact resistance even when an annealing temperature is increased.
- a switching element is formed on a surface of a semiconductor substrate.
- an interlayer insulating film covering the switching element is formed.
- a contact hole reaching the conductive layer forming the switching element is formed in the interlayer insulating film.
- a contact plug is embedded in the contact hole.
- a barrier metal film connected to the contact plug is selectively formed on the interlayer insulating film.
- a first insulating film is formed on the entire surface.
- the inclination of the surface of the first insulating film is moderated by performing sputter etching on the first insulating film.
- a ferroelectric capacitor is formed on the barrier metal film.
- a switching element is formed on a surface of a semiconductor substrate.
- an interlayer insulating film covering the switching element is formed.
- a contact hole reaching the conductive layer forming the switching element is formed in the interlayer insulating film.
- a contact plug is embedded in the contact hole.
- a barrier metal film connected to the contact plug is selectively formed on the interlayer insulating film.
- an insulating film thicker than the barrier metal film is formed on the entire surface by a high-density plasma method.
- a ferroelectric capacitor is formed on the barrier metal film.
- FIG. 1 is a circuit diagram showing a configuration of a memory cell array of a ferroelectric memory (semiconductor device) manufactured by a method according to an embodiment of the present invention.
- FIGS. 2A and 2B are cross-sectional views illustrating a method of manufacturing the ferroelectric memory according to the first embodiment of the present invention.
- FIGS. 3A and 3B are cross-sectional views showing a method of manufacturing the ferroelectric memory according to the first embodiment of the present invention, following FIGS. 2A and 2B.
- FIGS. 3A and 3B are cross-sectional views showing a method for manufacturing the ferroelectric memory according to the first embodiment of the present invention, following FIGS. 3A and 3B.
- FIGS. 5A and 5B are cross-sectional views showing a method for manufacturing the ferroelectric memory according to the first embodiment of the present invention, following FIGS. 4A and 4B.
- 6A and 6B are cross-sectional views showing a method for manufacturing the ferroelectric memory according to the first embodiment of the present invention, following FIGS. 5A and 5B.
- FIGS. 6A and 6B are cross-sectional views showing a method of manufacturing the ferroelectric memory according to the first embodiment of the present invention, following FIGS. 6A and 6B.
- FIGS. 7A and 7B are cross-sectional views showing a method for manufacturing the ferroelectric memory according to the first embodiment of the present invention, following FIGS. 7A and 7B.
- FIGS. 8A and 8B are cross-sectional views showing a method for manufacturing the ferroelectric memory according to the first embodiment of the present invention, following FIGS. 8A and 8B.
- FIGS. 10A and 10B are cross-sectional views showing the method of manufacturing the ferroelectric memory according to the first embodiment of the present invention, following FIGS. 9A and 9B.
- FIGS. 11A and 11B are cross-sectional views showing the method of manufacturing the ferroelectric memory according to the first embodiment of the present invention, following FIGS. 10A and 10B.
- FIGS. 12A and 12B are cross-sectional views showing the method of manufacturing the ferroelectric memory according to the first embodiment of the present invention, following FIGS. 11A and 11B.
- FIGS. 13A and 13B are cross-sectional views showing a method of manufacturing the ferroelectric memory according to the first embodiment of the present invention in the order of steps.
- FIGS. 14A and 14B are cross-sectional views showing the method of manufacturing the ferroelectric memory according to the first embodiment of the present invention, following FIGS. 11A and 11B.
- FIGS. 15A and 15B are cross-sectional views showing a method of manufacturing the ferroelectric memory according to the first embodiment of the present invention, following FIGS. 11A and 11B.
- FIGS. 16A and 16B are cross-sectional views showing the method of manufacturing the ferroelectric memory according to the first embodiment of the present invention, following FIGS. 11A and 11B.
- FIGS. 17A and 17B are cross-sectional views showing a method of manufacturing the ferroelectric memory according to the first embodiment of the present invention, following FIGS. 11A and 11B.
- FIGS. 18A and 18B are cross-sectional views showing the method of manufacturing the ferroelectric memory according to the first embodiment of the present invention, following FIGS. 11A and 11B.
- FIGS. 19A and 19B are cross-sectional views showing a method of manufacturing the ferroelectric memory according to the first embodiment of the present invention, following FIGS. 11A and 11B.
- FIGS. 20A and 20B show the first embodiment of the present invention following FIGS. 11A and 11B.
- FIG. 5 is a cross-sectional view illustrating the method of manufacturing the ferroelectric memory according to the embodiment.
- FIGS. 21A and 21B are cross-sectional views, following FIGS. 11A and 11B, illustrating the method of manufacturing the ferroelectric memory according to the first embodiment of the present invention.
- FIGS. 22A and 22B are cross-sectional views showing the method of manufacturing the ferroelectric memory according to the first embodiment of the present invention, following FIGS. 11A and 11B.
- FIGS. 23A and 23B are cross-sectional views showing a method of manufacturing the ferroelectric memory according to the first embodiment of the present invention, following FIGS. 11A and 11B.
- FIGS. 24A and 24B are cross-sectional views illustrating a method of manufacturing the ferroelectric memory according to the second embodiment of the present invention.
- FIGS. 25A and 25B are cross-sectional views showing a method of manufacturing the ferroelectric memory according to the second embodiment of the present invention, following FIGS. 24A and 24B.
- FIGS. 26A and 26B are cross-sectional views, following FIGS. 25A and 25B, illustrating the method of manufacturing the ferroelectric memory according to the second embodiment of the present invention.
- FIGS. 27A and 27B are cross-sectional views, following FIGS. 26A and 26B, illustrating the method of manufacturing the ferroelectric memory according to the second embodiment of the present invention.
- FIGS. 28A and 28B are cross-sectional views, following FIGS. 27A and 27B, illustrating the method of manufacturing the ferroelectric memory according to the second embodiment of the present invention.
- FIGS. 29A and 29B are cross-sectional views showing a method of manufacturing the ferroelectric memory according to the second embodiment of the present invention, following FIGS. 28A and 28B.
- FIGS. 30A and 30B are sectional views, following FIGS. 29A and 29B, illustrating the method for manufacturing the ferroelectric memory according to the second embodiment of the present invention.
- FIGS. 30A and 30B are cross-sectional views, following FIGS. 30A and 30B, illustrating the method of manufacturing the ferroelectric memory according to the second embodiment of the present invention.
- FIGS. 32A and 32B are cross-sectional views showing the method of manufacturing the ferroelectric memory according to the second embodiment of the present invention, following FIGS. 31A and 31B.
- FIGS. 33A and 33B are cross-sectional views illustrating a method of manufacturing the ferroelectric memory according to the third embodiment of the present invention.
- FIGS. 34A and 34B are cross-sectional views, following FIGS. 33A and 33B, illustrating the method of manufacturing the ferroelectric memory according to the third embodiment of the present invention.
- FIGS. 35A and 35B are cross-sectional views showing the method of manufacturing the ferroelectric memory according to the third embodiment of the present invention, following FIGS. 34A and 34B.
- 36A and 36B are cross-sectional views showing a method for manufacturing a ferroelectric memory according to the third embodiment of the present invention, following FIGS. 35A and 35B.
- FIGS. 37A and 37B are cross-sectional views showing the method of manufacturing the ferroelectric memory according to the third embodiment of the present invention, following FIGS. 36A and 36B.
- FIGS. 38A and 38B are cross-sectional views, following FIGS. 37A and 37B, illustrating the method of manufacturing the ferroelectric memory according to the third embodiment of the present invention.
- FIGS. 39A and 39B are cross-sectional views, following FIGS. 38A and 38B, illustrating the method of manufacturing the ferroelectric memory according to the third embodiment of the present invention.
- FIGS. 4OA and 40B are cross-sectional views showing a method of manufacturing the ferroelectric memory according to the third embodiment of the present invention, following FIGS. 39A and 39B.
- FIGS. 41A and 41B are cross-sectional views, following FIGS. 40A and 40B, illustrating the method for manufacturing the ferroelectric memory according to the third embodiment of the present invention.
- FIGS. 42A and 42B are cross-sectional views, following FIGS. 41A and 41B, illustrating the method of manufacturing the ferroelectric memory according to the third embodiment of the present invention.
- FIGS. 43A and 43B are cross-sectional views showing a method of manufacturing the ferroelectric memory according to the third embodiment of the present invention, following FIGS. 42A and 42B.
- FIGS. 44A and 44B are cross-sectional views showing cross sections orthogonal to the cross sections shown in FIGS. 43A and 43B, respectively.
- FIG. 45A and FIG. 45B are cross-sectional views illustrating a method of manufacturing the ferroelectric memory according to the fourth embodiment of the present invention.
- FIGS. 46A and 46B are sectional views, following FIGS. 45A and 45B, illustrating the method of manufacturing the ferroelectric memory according to the fourth embodiment of the present invention.
- FIGS. 47A and 47B are cross-sectional views, following FIGS. 46A and 46B, illustrating the method of manufacturing the ferroelectric memory according to the fourth embodiment of the present invention.
- FIGS. 48A and 48B are cross-sectional views, following FIGS. 47A and 47B, illustrating the method for manufacturing the ferroelectric memory according to the fourth embodiment of the present invention.
- FIGS. 49A and 49B show a fourth embodiment of the present invention following FIGS. 48A and 48B.
- FIG. 5 is a cross-sectional view illustrating the method of manufacturing the ferroelectric memory according to the embodiment.
- FIGS. 5OA and 50B are cross-sectional views, following FIGS. 49A and 49B, illustrating the method for manufacturing the ferroelectric memory according to the fourth embodiment of the present invention.
- FIGS. 51A and 51B are cross-sectional views showing a method of manufacturing the ferroelectric memory according to the fourth embodiment of the present invention, following FIGS. 50A and 50B.
- FIGS. 52A and 52B are cross-sectional views showing the method of manufacturing the ferroelectric memory according to the fourth embodiment of the present invention, following FIGS. 51A and 51B.
- FIGS. 53A and 53B are cross-sectional views, following FIGS. 52A and 52B, illustrating the method of manufacturing the ferroelectric memory according to the fourth embodiment of the present invention.
- FIGS. 54A and 54B are cross-sectional views illustrating a method of manufacturing a semiconductor device according to a reference example.
- FIG. 55A and FIG. 55B are scanning electron micrographs showing slits and cracks. BEST MODE FOR CARRYING OUT THE INVENTION
- FIG. 1 is a circuit diagram showing a configuration of a memory cell array of a ferroelectric memory (semiconductor device) manufactured by a method according to an embodiment of the present invention.
- This memory cell array is provided with a plurality of bit lines 3 extending in one direction, and a plurality of lead lines 4 and plate lines 5 extending in a direction perpendicular to the direction in which the bit lines 3 extend. Have been.
- a plurality of memory cells of the ferroelectric memory according to the present embodiment are arranged in an array so as to match the lattice formed by the bit line 3, the word line 4, and the plate line 5. .
- Each memory cell is provided with a ferroelectric capacitor 1 and a MOS transistor 2.
- the gate of the MOS transistor 2 is connected to the word line 4. Also, one source / drain of the MOS transistor 2 is connected to the bit line 3, and the other source ′ drain is connected to one electrode of the ferroelectric capacitor 1. Then, the other electrode of the ferroelectric capacitor 1 is connected to the plate line 5. Note that each word line 4 and plate line 5 are arranged in the same direction as the direction in which they extend. Shared by MOS transistor 2. Similarly, each bit line 3 is shared by a plurality of MOS transistors 2 arranged in the same direction as the direction in which the bit line 3 extends. The direction in which the code line 4 and the plate line 5 extend and the direction in which the bit line 3 extends may be referred to as a row direction and a column direction, respectively.
- FIGS. 54A and 54B are cross-sectional views illustrating a method of manufacturing a semiconductor device according to a reference example. However, FIGS. 54A and 54B show cross sections perpendicular to the direction in which the bit lines 3 extend.
- FIG. 54A shows a cross section of the memory cell array section of the ferroelectric memory
- FIG. 54B shows a cross section of the logic section (logic circuit section).
- an MS transistor (not shown) having a source / drain diffusion layer 118 is formed on a surface of a semiconductor substrate (not shown).
- a silicon oxide film 122 is formed so as to cover the MOS transistor, and the silicon oxide film 122 is flattened by CMP (chemical mechanical polishing) or the like.
- CMP chemical mechanical polishing
- a contact hole reaching each source / drain diffusion layer 118 is formed in the silicon oxide film 122 to open a plug contact portion.
- a W film is buried by, for example, a CVD method, and is planarized by performing CMP, thereby forming a W plug 124.
- an Ir film 125 is formed on the entire surface as a W oxidation preventing barrier metal film. After that, the Ir film 125 is patterned using a hard mask. Subsequently, a W oxidation preventing insulating film 125 and a capacitor adhesion insulating film 150 are sequentially formed on the entire surface, and the capacitor adhesion insulating film 150, the W oxidation preventing insulating film 125 and the Ir film 1 are formed by CMP. By polishing 25, the Ir film 125 of a predetermined thickness is left, and the capacity adhesion insulating film 150 is left on the W oxidation preventing insulating film 125.
- the W oxidation preventing insulating film 125 is, for example, a plasma SiON film
- the capacitor adhesion insulating film 150 is, for example, a TEOS (tetraethyl orthosilicate) film.
- a lower electrode film 130, a ferroelectric film 131 and an upper electrode film 132 are sequentially formed. Then, these are collectively patterned to form a ferroelectric capacitor. Note that the capacitive adhesion insulating film 150 is for preventing the lower electrode film 130 from peeling off.
- a ferroelectric memory is completed by forming an interlayer insulating film (not shown) and the like.
- the Ir film (W oxidation preventing barrier metal film) 125 and the W oxidation preventing insulating film 129 are formed.
- the W plug 124 is difficult to oxidize.
- the formation of the contact hole and the embedding of the glue film and the W plug are performed twice. In other words, a via-to-via structure is formed. For this reason, the aspect ratio of the contact hole becomes small, and even if miniaturization is recommended, the formation of the contact hole is relatively easy.
- the surface of the W oxidation-preventing insulating film 1229 becomes steep in a portion where the interval between the I 1 -films 25 adjacent to each other is small. A deep groove is formed. Therefore, when the capacitor adhesion insulating film 150 is formed, the capacitor adhesion insulating film 150 is not buried in the deep groove, and a gap 15 1 remains.
- the gap 15 1 is used as a starting point. As shown in FIG. 55A and FIG. 55B, slit cracks occur.
- the W oxidation preventing insulating film 12 9 is also formed through the slits and cracks. It is etched, and even the interlayer insulating film 122 is etched.
- the inventors of the present application have made intensive studies to prevent the occurrence of slits and cracks, and as a result, have arrived at the following forms.
- FIG. 2A and FIG. 2B to FIG. 12A and FIG. 12B are cross-sectional views showing a method of manufacturing the ferroelectric memory (semiconductor device) according to the first embodiment of the present invention in the order of steps.
- FIGS. 13A and 13B to 23A and 23B are cross-sectional views showing a method of manufacturing the ferroelectric memory according to the first embodiment in the order of steps.
- FIGS. 2A and 2B to 12A and 12B show cross sections perpendicular to the direction in which the bit line 3 extends
- FIGS. 13A and 13B to 23A and 23B It shows a section perpendicular to the direction in which line 4 extends.
- FIGS. 13A to 23A show a portion corresponding to two MOS transistors sharing one bit line (corresponding to bit line 3 in FIG. 1).
- FIGS. 2A to 23A show cross sections of a memory cell array portion of a ferroelectric memory
- FIGS. 2B to 23B show drivers and read circuits provided around the memory cell array portion.
- 3 shows a cross section of a logic part (logic circuit part) of the above.
- a well 12 is formed on the surface of a semiconductor substrate 11 such as a silicon substrate.
- an element isolation region 13 is formed on the surface of the semiconductor substrate 11 by, for example, STI (shallow trench isolation).
- a MOS transistor switching element
- the MOS transistor 20 corresponds to the MOS transistor 2 in FIG.
- Each MOS transistor 20 has two source / drain diffusion layers 18 for source and drain, one of which is shared between the two MOS transistors 20.
- a silicon oxynitride film 21 is formed on the entire surface so as to cover the MOS transistor 20. Then, a silicon oxide film 22 is formed as an interlayer insulating film on the entire surface, and the silicon oxide film 22 is planarized by CMP (chemical mechanical polishing) or the like. The silicon oxynitride film 21 is formed to prevent hydrogen deterioration of the gate insulating film 14 and the like when forming the silicon oxide film 22. Thereafter, a contact hole reaching each silicide layer 19 is formed in the silicon oxide film 22 and the silicon oxynitride film 21 to open a plug contact portion.
- CMP chemical mechanical polishing
- a W film is buried by, for example, a CVD method, and planarized by CMP to form a W plug (contact plug) 24. Subsequently, N 2 plasma treatment is performed at 350 ° C. for 120 seconds.
- the glue film 23 for example, a laminated film composed of a Ti film having a thickness of 20 nm and a TiN film having a thickness of 50 nm is used.
- an Ir film 25 having a thickness of, for example, 45 Onm is formed on the entire surface as a W oxidation preventing barrier metal film.
- a TiN film 26a and a plasma TEOS film 26b, which are used as a hard mask when the Ir film 25 is patterned are sequentially formed.
- the thicknesses of the TiN film 26a and the plasma TEOS film 26b are, for example, 200 nm and 1200 nm, respectively.
- the hard mask 26 is formed only in a region where a stack type ferroelectric capacitor is to be formed by patterning the plasma TEOS film 26b and the TiN film 26a.
- the Ir film 25 is etched using the hard mask 26.
- a plasma SiON film (first insulating film) 27 is formed.
- the thickness of the plasma SiON film 27 is, for example, 150 nm. At this point, a relatively steep and deep groove exists in the plasma SiON film 27, particularly in a region where the island-like Ir film 25 is in proximity.
- the Ar sputtering etching is performed on the plasma SiO 2 film 27.
- the conditions at this time are, for example, for the RF power source, the source power is 1500 W
- the bias power is 1600 W (800 kHz).
- the pressure in the chamber be 13.3 Pa (l O OmTo rr)
- the flow rate of the Ar gas is set at 400 sccm, and the etching time is set at 30 seconds.
- the generated residue is deposited on a portion of the plasma SiON film 27 which remains at that time.
- the surface of the plasma SiO 2 film 27 gradually becomes gentle, and the shape of the plasma SiO 2 film 27 becomes It approaches a flat shape. Therefore, a steep and deep groove disappears from the plasma SiO 2 film 27.
- a plasma SiON film (second insulating film) 28 is formed.
- the thickness of the plasma SiON film 27 is, for example, 900 nm.
- a W oxidation prevention insulating film 29 for preventing oxidation of the W plug 24 exposed in the logic portion is constituted by the plasma SiON films 27 and 28.
- the W oxidation preventing insulating film 29 (plasma SiON films 27 and 28) and the hard mask 26 ( The plasma TEOS film 26b, the TiN film 26a) and the Ir film 25 are polished by a CMP method.
- the remaining film thicknesses of the Ir film 25 and the IW oxidation preventing insulating film 29 after the CMP are, for example, 350 nm.
- the W oxidation preventing insulating film 29 becomes thinner by about 25 O nm.
- in-furnace heat treatment is performed, for example, at 65 ° C. for 60 minutes in an oxygen atmosphere in order to recover damage at the time of etching.
- the W oxidation preventing insulating film 29 needs to have a thickness of 10 O nm or more.
- the remaining film of the W oxidation preventing insulating film 29 is formed so that the thickness of about 100 nm remains. Thickness, e.g. 35 O nm And
- a lower electrode film 30, a ferroelectric film 31, and an upper electrode film 32 are sequentially formed on the entire surface.
- the lower electrode film 30 for example, a laminated film including an Ir film having a thickness of 200 nm, a Pt0 film having a thickness of 23 ⁇ m, and a Pt film having a thickness of 50 nm is sequentially formed.
- the Tsuyo ⁇ conductor film 31 for example a thickness of 20 onm of Pb (Z r, T i) 0 3 film used (P ZT film).
- the upper electrode film 32 for example, an IrO 2 film having a thickness of 20 Onm is used.
- annealing for preventing film peeling is performed before and after the formation of the lower electrode film 30, annealing for preventing film peeling is performed.
- RTA Heating Thermal Annealing
- crystallization annealing is performed.
- RTA using Ar and 2 at 600 for 90 seconds and RTA in an oxygen atmosphere is performed after forming the upper electrode film 32, the lower electrode film 30, the ferroelectric A TiN film 33a and a plasma TEOS film 33b used as a hard mask when patterning the body film 31 and the upper electrode film 32 are sequentially formed.
- the hard mask 33 is formed only in a region where a stack type ferroelectric capacitor is to be formed by patterning the plasma TEOS film 33b and the TiN film 33a.
- the upper electrode film 32 and the ferroelectric film 31 are formed by using a polishing and etching technique using the hard mask 33 as a mask.
- a ferroelectric capacitor having a stack structure is formed. This ferroelectric capacitor corresponds to the ferroelectric capacitor 1 in FIG.
- the hard mask 33 is removed.
- the W oxidation preventing insulating film 29 becomes thinner by about 250 nm and remains by about 100 nm.
- a recovery annealing is performed. Is applied. In this recovery annealing, for example, annealing in an oxygen atmosphere at 65 ° C. for 60 minutes is performed.
- an alumina film 34 is formed on the entire surface as a protective film for protecting the ferroelectric capacitor from process damage. .
- the thickness of the alumina film 34 is, for example, 50 nm.
- annealing in an oxygen atmosphere at 65 ° C. for 60 minutes is performed.
- an interlayer insulating film 35 is formed on the entire surface, and the interlayer insulating film 35 is planarized by CMP.
- the remaining film thickness of the interlayer insulating film 35 after CMP is, for example, 400 nm on the upper electrode film 32.
- a contact hole reaching the W plug 24 is formed by using patterning and etching techniques.
- an interlayer insulating film 35 It is formed on an interlayer insulating film 35, an alumina film 34 and an IAV oxidation preventing insulating film 29.
- annealing is performed in an oxygen atmosphere at 550 for 60 minutes, for example.
- a W film is buried and flattened by CMP to form a W plug 37.
- As the dull film 36 for example, TiN having a thickness of 50 nm can be used.
- the surface of the interlayer insulating film 35 and the surface of the W plug 37 are exposed to N 2 plasma, for example, at 35.
- the time of this plasma processing is, for example, 120 seconds.
- a W oxidation preventing insulating film (not shown) is formed on the entire surface.
- the W oxidation preventing insulating film for example, a SiON film is used, and its thickness is, for example, about 10 O nm.
- a contact hole reaching the upper electrode film 32 is formed in the W oxidation preventing insulating film and the interlayer insulating film 35 by using patterning and etching techniques.
- an anneal is applied to recover damage due to etching. This annealing is performed in an oxygen atmosphere at 550 ° C. for 60 minutes, for example. After this annealing, the W oxidation preventing insulating film is removed by etch back.
- a lower glue film 38, a wiring material film 39, and an upper glue film 40 are sequentially deposited.
- a TiN film having a thickness of 100 nm is used.
- the wiring material film for example, an A1-Cu alloy film having a thickness of 40 nm is used.
- the upper glue film for example, a laminated film of a Ti film having a thickness of 5 nm and a TiN film having a thickness of 70 nm is used.
- an antireflection film (not shown) is formed on the dull film 40, and a resist film (not shown) is applied.
- the resist film is processed so as to match the wiring pattern, and the antireflection film, the glue film 40, the wiring material film 39, and the glue film 38 are etched using the processed resist film as a mask.
- a Si ⁇ N film is used as the antireflection film, and its thickness is, for example, about 31 nm.
- the formation of an interlayer insulating film, the formation of a contact plug, the formation of the second and subsequent wiring from the bottom, and the like are further performed.
- a cover film made of, for example, a TEOS film and a SiN film is formed to complete a ferroelectric memory having a ferroelectric capacity.
- the wiring 41 connected to the upper electrode film 32 is connected to the plate line, and the source * drain diffusion layer shared by the two MOS transistors 20 is formed.
- Wiring 41 connected to 18 is connected to the bit line.
- the gate electrode 15 the word line itself may be used. In the upper wiring, the gate electrode 15 may be connected to the word line.
- the W oxidation preventing insulating film 29 when forming the W oxidation preventing insulating film 29 having a thickness of about 35 O nm, first, a plasma SiON film 27 having a thickness of about 150 nm is formed. Then, after the sharp grooves are eliminated from the plasma SiO 2 film 27 by performing Ar sputtering etching, a plasma SiO 2 film 28 of about 900 nm is formed. For this reason, according to the first embodiment, generation of voids in the W oxidation preventing insulating film 29 is prevented. As a result, it is possible to suppress an increase in the contact resistance even when the annealing temperature is increased, while preventing the occurrence of cracks and slits.
- via-to-via contacts are realized from the W plugs 37 and 24 in the logic unit. Is done. Then, the wiring 41 is connected to the source / drain diffusion layer 18 via the via-to-via contact.
- FRAM has a large step due to the ferroelectric capacity, so the bottom layer The effect of the contact from the first wiring 41 to the substrate (or the diffusion layer formed on the surface) increases. If a contact hole is to be formed by batch etching as in the past in order to form this contact, the etching itself is difficult. Also, it is difficult to form a glue film. For this reason, new equipment suitable for forming such a contact hole opening / glue film is required.
- FIGS. 24A and 24B to 32A to 32B are sectional views showing a method of manufacturing a ferroelectric memory (semiconductor device) according to the second embodiment of the present invention in the order of steps. It is. However, these figures show cross sections perpendicular to the direction in which the bit lines 3 extend.
- FIGS. 24A to 32A show cross sections of the memory cell array portion of the ferroelectric memory
- FIGS. 24B to 32B show cross sections of the logic portion.
- the Ir film 25 is etched using the hard mask 26 as in the first embodiment.
- a SiON film 42 is formed on the entire surface as a W oxidation preventing insulating film by a high density plasma (HDP: High Density Plasma) method.
- the thickness of the SiO 2 film 42 is, for example, 400 nm. According to the HDP method, good coverage is obtained, so that the SiON film 43 can be formed without generating voids.
- a plasma TEOS film 43 is formed on the entire surface as a sacrificial film for subsequent CMP.
- Plasma TEOS film 4 The thickness of 3 is, for example, 600 nm.
- the 6b, the TiN film 26a) and the Ir film 25 are polished by the CMP method.
- the remaining film thickness of the Ir film 25 and the SiON film (W oxidation preventing insulating film) 42 after CMP is, eg, 350 nm.
- the upper electrode film 32, the ferroelectric film 31 and the lower electrode film 30 are collectively processed as in the first embodiment. Thereby, a ferroelectric capacitor having a stack structure is formed.
- processing from removal of the hard mask 33 to recovery annealing is performed as in the first embodiment.
- the SiON film 42 is formed without any voids. Can be formed with good coverage. For this reason, as in the first embodiment, it is possible to prevent the occurrence of crack splits and to suppress an increase in contact resistance even when the annealing temperature is increased.
- FIGS. 33A and 33B to 43A to 43B are cross-sectional views showing a method of manufacturing a ferroelectric memory (semiconductor device) according to the third embodiment of the present invention in the order of steps. It is. However, these figures show cross sections perpendicular to the direction in which the bit lines 3 extend.
- FIGS. 33A to 43A show cross sections of the memory cell array portion of the ferroelectric memory
- FIGS. 33B to 43B show cross sections of the logic portion.
- FIGS. 44A and 44B are cross-sectional views showing cross sections orthogonal to the cross sections shown in FIGS. 43A and 43B, respectively, and show cross sections perpendicular to the direction in which the word lines 4 extend.
- Fig. 44A shows the cross section of the memory cell array of the ferroelectric memory.
- FIG. 44B shows a cross section of the logic section.
- the formation of the well 12 and the planarization of the silicon oxide film 22 by the CMP method are started. Perform processing up to conversion.
- a SiON film (third insulating film) 44 is formed on the silicon oxide film 22 as an insulating film for preventing silicon oxide.
- the thickness of the SiON film 44 is, for example, 300 nm.
- the processes from the formation of the contact hole to the formation of the W-blag 24 are performed.
- the Ir film 25 is etched using the hard mask 26.
- a positive silicon oxide film 27 is formed.
- a plasma SiON film 28 is formed as in the first embodiment.
- the W oxidation preventing insulating film 29 (plasma SiON films 27 and 28), the hard mask 2 6 (plasma TEOS film 26b and TiN film 26a) and Ir film 25 are polished by CMP.
- the upper electrode film 32, the ferroelectric film 31 and the upper electrode film 30 are collectively processed. Thereby, the ferroelectric capacity of the stack structure is formed.
- FIG. 42A and FIG. 42B processes from removal of the hard mask 33 to recovery annealing are performed as in the first embodiment. Subsequently, as shown in FIG. 43A, FIG. 43B, FIG. 44A, and FIG. Is performed. Then, although not shown, the ferroelectric memory is completed by performing processes subsequent to the formation of an additional interlayer insulating film, as in the first embodiment.
- the oxidation of the W plug 24 can be more reliably prevented.
- the SiON film 44 of 10 O nm is further formed as a W oxidation preventing insulating film thereunder, for example, the reduction amount of the W oxidation preventing insulating film 29 is large. Even if it does, the W plug 24 in the subsequent heat treatment is extremely hard to oxidize.
- FIGS. 45A and 45B to FIGS. 53A to 53B are cross-sectional views showing a method of manufacturing a ferroelectric memory (semiconductor device) according to the fourth embodiment in the order of steps. It is. However, these figures show cross sections perpendicular to the direction in which the bit lines 3 extend.
- FIGS. 45A to 53A show cross sections of a memory cell array portion of a ferroelectric memory
- FIGS. 45B to 53B show cross sections of a logic portion.
- the Ir film 25 is etched using the hard mask 26 as in the first embodiment.
- a SiON film 42 is formed on the entire surface by an HDP method as an oxidation prevention insulating film.
- a plasma TEOS film 43 is formed on the entire surface.
- a plasma TEOS film (sacrificial film) 43, a SiON film (W oxidation preventing insulating film) 42, The hard mask 26 (plasma TEOS film 26b and the TiN film 26a) and the Ir film 25 are polished by the CMP method.
- the upper electrode film 32, the ferroelectric film 31 and the upper electrode film 30 are collectively processed. Thereby, the ferroelectric capacity of the stack structure is formed.
- the ferroelectric memory is completed by performing processes subsequent to the formation of the protective film, as in the first embodiment.
- the SiON film is used as the W oxidation preventing insulating film, but another insulating film such as a SiN film may be used instead.
- the W oxidation prevention barrier metal film itself is also polished to make the W oxidation prevention barrier metal film thin.
- the polishing may be terminated when the surface of the W oxidation preventing barrier metal film is exposed by setting a desired thickness at the time of film formation.
- the present invention it is possible to prevent a gap from being formed in an insulating film formed for preventing oxidation of a contact plug. Therefore, generation of cracks and slits caused by the voids can be prevented, and the arrival of oxygen at the contact plug can be further suppressed.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Manufacturing & Machinery (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Semiconductor Memories (AREA)
Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2003/004264 WO2004090985A1 (ja) | 2003-04-03 | 2003-04-03 | 半導体装置の製造方法 |
AU2003236355A AU2003236355A1 (en) | 2003-04-03 | 2003-04-03 | Process for producing semiconductor device |
CNB038257092A CN100355074C (zh) | 2003-04-03 | 2003-04-03 | 半导体装置的制造方法 |
JP2004570546A JP4319147B2 (ja) | 2003-04-03 | 2003-04-03 | 半導体装置の製造方法 |
EP03816594A EP1610385A4 (en) | 2003-04-03 | 2003-04-03 | PROCESS FOR PRODUCING SEMICONDUCTOR DEVICE |
US11/106,580 US7297558B2 (en) | 2003-04-03 | 2005-04-15 | Method of manufacturing semiconductor device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2003/004264 WO2004090985A1 (ja) | 2003-04-03 | 2003-04-03 | 半導体装置の製造方法 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US11/106,580 Continuation US7297558B2 (en) | 2003-04-03 | 2005-04-15 | Method of manufacturing semiconductor device |
Publications (1)
Publication Number | Publication Date |
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WO2004090985A1 true WO2004090985A1 (ja) | 2004-10-21 |
Family
ID=33156421
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PCT/JP2003/004264 WO2004090985A1 (ja) | 2003-04-03 | 2003-04-03 | 半導体装置の製造方法 |
Country Status (5)
Country | Link |
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EP (1) | EP1610385A4 (ja) |
JP (1) | JP4319147B2 (ja) |
CN (1) | CN100355074C (ja) |
AU (1) | AU2003236355A1 (ja) |
WO (1) | WO2004090985A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006165128A (ja) * | 2004-12-03 | 2006-06-22 | Fujitsu Ltd | 半導体装置及びその製造方法 |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH04323821A (ja) | 1991-04-23 | 1992-11-13 | Rohm Co Ltd | 半導体装置及びその電極用導電体の形成方法 |
JPH11133457A (ja) | 1997-10-24 | 1999-05-21 | Canon Inc | マトリクス基板と表示装置及びその製造方法及び投写型液晶表示装置 |
US5986301A (en) * | 1995-01-27 | 1999-11-16 | Kabushiki Kaisha Toshiba | Thin film capacitor with electrodes having a perovskite structure and a metallic conductivity |
US5998258A (en) | 1998-04-22 | 1999-12-07 | Motorola, Inc. | Method of forming a semiconductor device having a stacked capacitor structure |
JP2001068648A (ja) * | 1999-08-30 | 2001-03-16 | Matsushita Electronics Industry Corp | 半導体装置及びその製造方法 |
US20030011002A1 (en) * | 2001-07-11 | 2003-01-16 | Hitachi, Ltd. | Semiconductor integrated circuit device and production method thereof |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6734477B2 (en) * | 2001-08-08 | 2004-05-11 | Agilent Technologies, Inc. | Fabricating an embedded ferroelectric memory cell |
-
2003
- 2003-04-03 CN CNB038257092A patent/CN100355074C/zh not_active Expired - Fee Related
- 2003-04-03 WO PCT/JP2003/004264 patent/WO2004090985A1/ja active Application Filing
- 2003-04-03 JP JP2004570546A patent/JP4319147B2/ja not_active Expired - Fee Related
- 2003-04-03 AU AU2003236355A patent/AU2003236355A1/en not_active Abandoned
- 2003-04-03 EP EP03816594A patent/EP1610385A4/en not_active Withdrawn
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04323821A (ja) | 1991-04-23 | 1992-11-13 | Rohm Co Ltd | 半導体装置及びその電極用導電体の形成方法 |
US5986301A (en) * | 1995-01-27 | 1999-11-16 | Kabushiki Kaisha Toshiba | Thin film capacitor with electrodes having a perovskite structure and a metallic conductivity |
JPH11133457A (ja) | 1997-10-24 | 1999-05-21 | Canon Inc | マトリクス基板と表示装置及びその製造方法及び投写型液晶表示装置 |
US5998258A (en) | 1998-04-22 | 1999-12-07 | Motorola, Inc. | Method of forming a semiconductor device having a stacked capacitor structure |
JP2001068648A (ja) * | 1999-08-30 | 2001-03-16 | Matsushita Electronics Industry Corp | 半導体装置及びその製造方法 |
US20030011002A1 (en) * | 2001-07-11 | 2003-01-16 | Hitachi, Ltd. | Semiconductor integrated circuit device and production method thereof |
Non-Patent Citations (1)
Title |
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See also references of EP1610385A4 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006165128A (ja) * | 2004-12-03 | 2006-06-22 | Fujitsu Ltd | 半導体装置及びその製造方法 |
JP4589092B2 (ja) * | 2004-12-03 | 2010-12-01 | 富士通セミコンダクター株式会社 | 半導体装置の製造方法 |
Also Published As
Publication number | Publication date |
---|---|
EP1610385A4 (en) | 2009-05-06 |
CN100355074C (zh) | 2007-12-12 |
JPWO2004090985A1 (ja) | 2006-07-06 |
CN1717806A (zh) | 2006-01-04 |
AU2003236355A1 (en) | 2004-11-01 |
JP4319147B2 (ja) | 2009-08-26 |
EP1610385A1 (en) | 2005-12-28 |
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