Source: https://patents.google.com/patent/KR100538719B1/en
Timestamp: 2020-07-16 18:15:45+00:00
Document Index: 62839260

Matched Legal Cases: ['art 22', 'art 22', 'art 22', 'art 22', 'art 22', 'art 22', 'art 22', 'art 22', 'art 22', 'art 22']

KR100538719B1 - Semiconductor device and method of manufacturing the same - Google Patents
KR100538719B1
KR100538719B1 KR20020083275A KR20020083275A KR100538719B1 KR 100538719 B1 KR100538719 B1 KR 100538719B1 KR 20020083275 A KR20020083275 A KR 20020083275A KR 20020083275 A KR20020083275 A KR 20020083275A KR 100538719 B1 KR100538719 B1 KR 100538719B1
KR20020083275A
KR20030058919A (en
호까조노아끼라
2001-12-25 Priority to JPJP-P-2001-00392569 priority Critical
2002-12-24 Application filed by 가부시끼가이샤 도시바 filed Critical 가부시끼가이샤 도시바
2003-07-07 Publication of KR20030058919A publication Critical patent/KR20030058919A/en
2005-12-26 Application granted granted Critical
2005-12-26 Publication of KR100538719B1 publication Critical patent/KR100538719B1/en
XUIMIQQOPSSXEZ-UHFFFAOYSA-N silicon Chemical compound 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[Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 45
FVBUAEGBCNSCDD-UHFFFAOYSA-N silicide(4-) Chemical compound data:image/svg+xml;base64,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 data:image/svg+xml;base64,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 [Si-4] FVBUAEGBCNSCDD-UHFFFAOYSA-N 0.000 claims description 19
229910000577 Silicon-germanium Inorganic materials 0.000 claims description 12
229910052732 germanium Inorganic materials 0.000 description 11
238000001015 X-ray lithography Methods 0.000 description 3
Formed on the substrate and spaced apart from each other, each of the first and second transistors having an active region, an isolation region separating the first and second transistors, a slit formed in the isolation region, and an inner wall portion of the slit A conductive film, first and second portions of the wiring layer electrically connected to the active region, and a third portion of the wiring layer formed on the separation region along the slit and integrated with the first and second portions are provided.
Semiconductor device and manufacturing method therefor {SEMICONDUCTOR DEVICE AND METHOD OF MANUFACTURING THE SAME}
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a semiconductor device having n- and p-channel MOS transistors, and a method of manufacturing the same, and more particularly, to a semiconductor device in which diffusion regions of MOS transistors are connected by a wiring layer, and a method of manufacturing the same.
There is an increasing demand for higher performance of LSIs, and further refinement techniques are required for semiconductor process technologies. In such a situation, the densification of LSI is indispensable, and it is necessary to proceed with scaling as much as possible.
In the LSI, many wiring patterns exist for electrically connecting adjacent regions, for example, n-type regions and p-type region regions. In this case, the n-type region and the p-type region are separated from each other by STI (Shallow Trench Isolation), and both regions are connected using the upper metal wiring.
In the static random access memory (SRAM), there is a wiring pattern for connecting the source, gate electrode, and drain of the MOS transistor to each other like a local interconnect. The local wiring is formed by forming an opening having a large opening with respect to the interlayer insulating film on the source, the gate electrode and the drain, and filling the opening with a conductive material.
1 is a cross-sectional view showing an example of a conventional semiconductor device having the local wiring. The p-type well region 52 and the n-type well region 53 are formed on the p-type substrate 51, and the n-type as the source and drain of the n-channel MOS transistor 54 is formed in the p-type well region 52. A region 55 is formed, and a p-type region 57 serving as a source and a drain of the p-channel MOS transistor 56 is formed in the n-type well region 53. In addition, an STI 58 is formed on the substrate 51 to separate both of the MOS transistors. Gate electrodes 59 are formed on channel regions between the pair of n-type regions 55 and the p-type region 57 of the MOS transistors 54 and 56, respectively. Also on the STI 58, a gate electrode 59 of another MOS transistor passing over the STI 58 is formed. In addition, an interlayer insulating film 60 is formed on the entire surface. For each of the interlayer insulating films 60, one n-type region 55 serving as a source or a drain of each of the gate electrode 59 on the STI 58 and the MOS transistors 54 and 56 disposed on both sides thereof. ) And a portion of the p-type region 57 are formed so that the wiring 61 is formed by filling the opening 61 with conductive material 62.
When fabricating the semiconductor device as shown in FIG. 1, since the opening 61 is formed by the reactive ion etching (RIE) technique, the STI 58 is partially etched at the boundary with the diffusion region. This causes a problem that leakage current is generated between the wiring and the substrate 51.
On the other hand, as a semiconductor device having a local wiring, one described in Japanese Patent Application Laid-Open No. 2000-114262 is conventionally known. This semiconductor device connects a pair of diffusion regions separated by STI by wiring formed using a selective growth technique and a selective etching technique of a silicon film.
That is, as shown in FIG. 2, the p-type well region 52 and the n-type well region 53 are formed on the p-type substrate 51, and the n-channel MOS transistor is formed in the p-type well region 52. An n-type region 55 serving as a source and a drain of is formed, and a p-type region 57 serving as a source and a drain of a p-channel MOS transistor is formed in the n-type well region 53. In addition, an amorphous silicon film is deposited on the entire surface, and the amorphous silicon film is selectively grown to form a single crystal silicon film, and then an amorphous silicon film other than the wiring forming portion is removed, and then the amorphous silicon film and the single crystal silicon of the wiring forming portion are removed. The wiring 63 made of the silicide film is left in the region of the film. This wiring 63 is formed over the STI 58.
In the semiconductor device shown in FIG. 2, it is not necessary to etch the interlayer insulating film to form an opening, so that generation of a leakage current between the wiring and the substrate due to the substrate being etched can be prevented.
However, it is very difficult to leave the epitaxial selection film for forming the wiring 63 in a desired pattern shape.
As described above, in the conventional semiconductor device, when connecting diffusion regions spaced apart from each other by a separation region by wiring, there is a problem that a junction leakage occurs or a difficulty in selectively forming a wiring layer.
According to one aspect of the present invention, a first and a second transistor formed on a semiconductor substrate and spaced apart from each other, each having a diffusion region, are formed on the semiconductor substrate, and between the first and second transistors. A separation region formed to separate the first and second transistors, the diffusion region of the first and second transistors to be continuous with each other, and having at least one slit having a predetermined width, and the at least one slit A conductive film formed therein, the first and second portions formed on the respective diffusion regions of the first and second transistors, and electrically connected to the respective diffusion regions, and the slit of the isolation region. Thus, a semiconductor device having a wiring layer formed on the separation region and having a third portion integrated with the first and second portions is provided.
According to another aspect of the present invention, by forming an isolation region on a semiconductor substrate, the first and second device regions separated from each other by the isolation region are formed in the semiconductor substrate, and the first and second regions within the isolation region. At least one slit having a predetermined width is formed so as to be continuous between the element regions, and a conductive film made of a material capable of becoming a nucleus for epitaxial growth is deposited on the entire surface, and then the conductive film is selectively Epitaxial growth around the conductive film that is removed and left on the partial regions of the first and second device regions, respectively, and left in the at least one slit, and left on the partial regions of the first and second device regions, respectively. After covering it with the material used as a block at the time of making it, it has a 1st part on a said 1st element area | region, and has a 2nd part on a said 2nd element area | region by an epitaxial growth method. And forming a wiring layer on the separation region along the slit of the separation region and having a third portion integrated with the first and second portions.
3 is a perspective view showing a configuration of a part of a semiconductor device according to the first embodiment of the present invention.
The p well region 12 and the n well region 13 are formed on the p-type silicon semiconductor substrate 11. In addition, an STI 14 is selectively formed on the substrate 11, and the p well region 12 and the n well region 13 are separated by the STI 14. An n-channel MOS transistor 15 is formed in the p well region 12, and a p-channel MOS transistor 16 is formed in the n well region 13. The n-channel MOS transistor 15 is formed in the p well region 12 and is formed to be located on a pair of n-type diffusion regions 17 serving as a source and a drain, and a channel region between the source and the drain, for example. A gate electrode 18 made of polysilicon is provided. Each of the pair of n-type diffusion regions 17 includes a first diffusion region having a shallow junction depth and a second diffusion region having a deep junction depth. The p-channel MOS transistor 16 is formed in the n well region 13 and is formed to be located on a pair of p-type diffusion regions 19 serving as a source and a drain and a channel region between the source and the drain, for example A gate electrode 18 made of polysilicon is provided. Each of the pair of p-type diffusion regions 19 also includes a first diffusion region having a shallow junction depth and a second diffusion region having a deep junction depth.
On the sidewalls of the gate electrodes 18 of the MOS transistors 15 and 16, a gate sidewall 20 made of a silicon oxide film, a silicon nitride film, or the like is formed.
As described later, one slit is formed in the STI 14 such that the n-type diffusion region 17 and the p-type diffusion region 19 positioned on both sides of the STI 14 are interposed therebetween. It is. This slit has an inner wall part and has a predetermined width. On the inner wall portion of the slit, a conductive film made of the same material as that of the gate electrodes 18 of the MOS transistors 15 and 16, that is, polysilicon is formed. In addition, this slit is formed so that the bottom part may not reach to the bottom part of STI14.
The wiring layer 22 made of a material containing silicon formed by epitaxial growth on the n-type diffusion region 17 and the p-type diffusion region 19 positioned on both sides with the STI 14 therebetween. The first part 22a and the second part 22b are formed. The first portion 22a of the wiring layer 22 is electrically connected to the n-type diffusion region 17, and the second portion 22b is electrically connected to the p-type diffusion region 19. The third portion 22c of the wiring layer 22 is formed on the STI 14 so as to follow the slit in the STI 14. This third portion 22c is integrated with the first and second portions 22a and 22b.
The wiring layer 22 has, for example, a laminated structure in which a lower layer is made of a silicon layer, an upper layer is made of a metal silicide layer, or a lower layer is made of a silicon germanium alloy layer and an upper layer is made of a metal silicide layer. The gate electrode 18 is also silicided at the top.
Next, the manufacturing method of the semiconductor device of the structure as shown in FIG. 3 is demonstrated with reference to FIGS. 4A-4G and FIG.
First, as shown in the cross-sectional view of FIG. 4A, for example, the silicon nitride film 31 and the silicon oxide film 32 are sequentially deposited on the p-type silicon semiconductor substrate 11, and then, by the exposure process, the silicon nitride film 31 is deposited. The laminated film 33 composed of the silicon nitride film 31 and the silicon oxide film 32 is left in a predetermined pattern shape. Subsequently, the substrate 11 is etched by an anisotropic etching method using the remaining laminated film 33 as a mask, for example, reactive ion etching, and a device isolation groove 34 having a depth of 200 to 350 nm is formed. do.
Next, as shown in the cross-sectional view of FIG. 4B, a buried insulating film 35 such as a silicon oxide film is deposited on the entire surface by, for example, the CVD method, and the element isolation groove 34 is formed into the buried insulating film ( Landfill by 35).
Subsequently, as shown in the cross-sectional view of FIG. 4C, the CMP (Chemical Mechanical Polishing) is performed to perform the flattening treatment.
Next, as shown in the cross-sectional view of FIG. 4D, the silicon nitride film 31 is removed by forming phosphoric acid heated to 160 ° C., for example, and the STI 14 is formed. Thereafter, the p-type well region 12 and the n-type well region 13 are formed in the substrate 11.
Subsequently, as shown in the perspective view of FIG. 4E, in order to form the slit, resist patterning is performed to have a pattern corresponding to the pattern of the slit, and then STI 14 is formed by reactive ion etching using this resist. One slit 36 is formed by embedding the insulating film 35 for embedding into 30 to 100 nm. The width W of this slit 36 is 0.03-0.1 micrometer. The minimum value 0.03 μm of the width W of the slit 36 corresponds to the minimum dimension of machining accuracy, and the maximum value 0.1 μm is then applied to the third portion 22 c of the wiring layer 22 embedded in the slit 36. It corresponds to the maximum value that can be buried substantially.
Subsequently, impurity ions for threshold adjustment are implanted into portions that become the channel regions of the n and p MOS transistors. Subsequently, the gate insulating film (0.5 to 3.0 nm) is formed on the entire surface by thermal oxidation or LP-CVD. 37) is formed. Subsequently, a polysilicon film 38 is deposited on the entire surface at a film thickness of 50 to 200 nm, and then the polysilicon film 38 is formed by an optical lithography method, an X-ray lithography method, or an electron beam lithography method. An etching mask for patterning a film is formed, and then the polysilicon film 38 is etched by reactive ion etching using the mask. As shown in the perspective view of FIG. 4F, the gate electrode 18 is formed. Is formed. After the etching, the polysilicon film 38 remains on the inner wall of the slit 36.
The silicon nitride film is deposited after the gate insulating film 37 and the polysilicon film 38 are deposited. Then, when the gate electrode 18 is formed from the polysilicon film 38, the silicon nitride film is etched. After that, the polysilicon film 38 is etched to leave the cap material 21 made of a silicon nitride film on the gate electrode 18 as shown in the perspective view of FIG. 4F. The cap material 21 made of this silicon nitride film can be used as a block during epitaxial growth performed thereafter.
Alternatively, the cap material 21 may not be formed, and then the epitaxial growth may be performed on the gate electrode 18.
The well region forming step and the implantation step of the impurity ions for adjusting the threshold value of the MOS transistor may be performed before the slit 36 is formed.
As the gate insulating film 37, not only a silicon oxide film but also an insulating film of any kind, such as a silicon oxynitride film, a silicon nitride film, or a film made of Ta 2 O 5 , which is a high dielectric film, can be used.
In addition, when epitaxial growth is not performed on the gate electrode 18, TiN and WN may be used as a barrier metal instead of a polysilicon film, and the gate electrode of the metal gate structure using W may be formed. Further, the gate electrode 18 may be formed using a silicon germanium alloy.
Thereafter, after the thermal oxidation method, a post oxide film having a thickness of 0.5 to 6 nm is formed on the entire surface, and n-type and p-type impurity ions are formed in the p-type well region 12 and the n-type well region 13, respectively. Introduced selectively, the first diffusion region 17a having a shallow junction depth constituting the n-type diffusion region 17 and the first diffusion region 19a having a shallow junction depth constituting the p-type diffusion region 19. ) Are formed respectively.
Next, as shown in the perspective view of FIG. 4G, the gate sidewall material is deposited on the entire surface by the LP-CVD method, and is subsequently etched back by reactive ion etching to gate on the sidewall of the gate electrode 18. Side walls 20 are formed. As the gate sidewall material, a film made of a silicon oxide film, a silicon nitride film, or a combination thereof can be used.
Next, after the high temperature treatment is performed in a hydrogen atmosphere to remove the native oxide film, selective growth of single crystal silicon is performed by the epitaxial growth method. For example, the portion that is the whole is heated to 650~800 ℃, SiH 4, SiH 2 Cl 2, reaction gas, such as SiHCl 3 is exposed on the silicon to be supplied with hydrogen, and the substrate 11 in a hydrogen atmosphere A single crystal silicon film is formed on the substrate. In addition, during this selective growth, an alloy made of silicon and germanium can be grown in addition to silicon.
Due to this epitaxial growth, as shown in the perspective view of FIG. 3, the wiring layer 22 made of a single crystal silicon film is formed on the n-type diffusion region 117 and the p-type diffusion region 19, and in particular, STI ( The first portion 22a of the wiring layer 22 is formed on the n-type diffusion region 17 positioned at both sides with the 14 interposed therebetween, and the second portion of the wiring layer 22 on the p-type diffusion region 19. 22b is formed.
At the time of epitaxial growth, epitaxial growth proceeds using the polysilicon film 38 remaining on the inner wall of the slit 36 formed in the STI 14 as a nucleus, and first, the interior of the slit 36 is embedded. The silicon film grows so that the silicon film grows and the silicon film grows so as to protrude above the slit 36, so that the third portion 22c of the wiring layer 22 is formed so as to conform to the slit 36. The third portion 22c is finally integrated with the first portion 22a and the second portion 22b.
Next, when the cap material 21 is present, after removing the cap material 21 by dilute hydrofluoric acid, n-type impurities and p-type impurities are diffused from the wiring layer 22, and the n-type diffusion region 17. The second diffusion region 17b having the deep junction depth constituting the lateral diffusion and the second diffusion region 19b having the deep junction depth constituting the p-type diffusion region 19 are formed. At this time, impurities are introduced into the gate electrode 18 at the same time.
FIG. 5 shows a detailed cross section along the 5-5 'line in FIG. Next, as shown in the cross-sectional view of FIG. 5, a metal film such as Ti, Co, Ni, Pd or the like is formed on the wiring layer 22, and then heat treatment is performed to form an upper portion of the wiring layer 22. The metal silicide layer 40 is formed. At the time of selective growth when the wiring layer 22 is formed, when an alloy made of silicon and germanium is grown instead of silicon, an alloy made of silicon and germanium is equivalent to the silicide layer 40. A silicided layer is formed. At this time, a metal film is formed on the gate electrode 18, and then a metal silicide layer 40 is formed on the gate electrode 18.
According to the semiconductor device of the first embodiment and a manufacturing method thereof, the n-type diffusion region 17 of the n-channel MOS transistor formed on both sides with the STI 14 therebetween and the p-type diffusion region of the p-channel MOS transistor ( The wiring layer 22 connecting 19 is continuously formed on the n-type diffusion region 17, on the p-type diffusion region 19, and on the STI 14. That is, since the contact is not formed in the STI edge portion, the problem of conventional junction leakage is solved.
In addition, since it is not necessary to secure a space for forming a contact on the diffusion region, the circuit area can be greatly reduced. It is also caused by the area occupied by the third portion 22c of the wiring layer 22 that connects the pair of diffusion regions 17 and 19 with the STI 14 therebetween, but in the SRAM and the like, the circuit area is 10% to 20%. Can be reduced.
6 is a perspective view illustrating a configuration of a part of a semiconductor device according to the second embodiment of the present invention. Since the semiconductor device of this second embodiment is only partially different from the semiconductor device according to the first embodiment shown in FIG. 3, the parts corresponding to those of FIG. 3 are given the same reference numerals and the description thereof will be omitted. Only differences from FIG. 3 will be described below.
The semiconductor device shown in FIG. 6 differs from the semiconductor device shown in FIG. 3 in that the width W of the third portion 22c of the wiring layer 22 formed on the STI 14, that is, the width of the wiring layer 22. It is a point that the dimension of the 3rd part 22c in the direction which intersects the direction where the 1st part 22a and the 2nd part 22b intersect is larger than the case of the semiconductor device shown in FIG.
In order to make the width W of the third portion 22c of the wiring layer 22 larger than that of FIG. 3, in the semiconductor device of FIG. 6, as described later, the STI 14 is interposed between the STIs 14. A plurality of slits are formed so that the n-type diffusion region 17 and the p-type diffusion region 19 positioned on both sides thereof are continuous. Each of these slits has an inner wall portion and each has a predetermined width. And on the inner wall part of each of these slits, the electrically conductive film which consists of polysilicon is formed, for example. Moreover, each of these slits is formed so that the bottom part may not reach the bottom part of STI14, respectively.
Next, the manufacturing method of the semiconductor device of the structure as shown in FIG. 6 is demonstrated.
Since the process until the STI 14 is formed on the board | substrate 11 is the same as the process shown to FIG. 4A-4D by 1st Embodiment, these description is abbreviate | omitted.
After the STI 14 is formed on the substrate 11, as shown in the perspective view of FIG. 7A, in order to form a plurality of slits, resist patterning is performed so as to have a pattern corresponding to the pattern of the plurality of slits. Thus, the insulating insulating film 35 for embedding in the STI 14 is etched back by 30 to 100 nm by reactive ion etching using this resist, so that the plurality of slits 36 are formed in parallel with each other. In this example, the case where three slits 36 are formed is illustrated. The width W of these slits 36 is set to 0.03-0.1 micrometer, respectively, similarly to the case of 1st Embodiment.
Next, as in the process shown in Fig. 4F, impurity ions for threshold adjustment are implanted into portions of the MOS transistors of both n and p channels, and then 0.5 to front surfaces are formed by thermal oxidation or LP-CVD. The gate insulating film 37 is formed with a film thickness of 3.0 nm. Subsequently, for example, a polysilicon film 38 is deposited on the entire surface with a film thickness of 50 to 200 nm, and then the polysilicon film is formed by an optical lithography method, an X-ray lithography method, or an electron beam lithography method. An etching mask for patterning the 38 is formed, and then the polysilicon film 38 is etched by reactive ion etching using the mask. As shown in the perspective view of FIG. 7B, the gate electrode ( 18) is formed. At this time, the polysilicon film 38 remains on the inner walls of the plurality of slits 36, respectively.
As shown in the perspective view of FIG. 7C, as in the case shown in FIG. 4F, the cap material 21 made of the silicon nitride film may be left on the gate electrode 18. The cap material 21 made of this silicon nitride film can be used as a block during epitaxial growth performed later. In addition, the cap material 21 may not be formed, and then the epitaxial growth may be performed on the gate electrode 18.
In addition, when epitaxial growth is not performed on the gate electrode 18, instead of the polysilicon film, TiN and WN may be used as the barrier metal, and a gate electrode having a metal gate structure using W may be formed. Further, the gate electrode 18 may be formed using a silicon germanium alloy.
Subsequently, after the thermal oxidation method, a post oxide film having a thickness of 0.5 to 6 nm is formed on the entire surface, n-type and p-type impurity ions are selectively introduced into the p well region 12 and the n well region 13. As a result, first diffusion regions 17a and 19a having shallow junction depths that constitute the n-type diffusion region 17 and the p-type diffusion region 19 are formed.
Next, as shown in the perspective view of FIG. 7C, the gate sidewall material is deposited on the entire surface by the LP-CVD method, and is subsequently etched back by reactive ion etching, thereby forming a sidewall of the gate electrode 18. Gate sidewall 20 is formed. As the gate sidewall material, a film made of a silicon oxide film, a silicon nitride film, or a combination thereof can be used.
Next, after the high temperature treatment is performed in a hydrogen atmosphere to remove the native oxide film, selective growth of single crystal silicon is performed by the epitaxial growth method. For example, the portion that is the whole is heated to 650~800 ℃, SiH 4, SiH 2 Cl 2, SiHCl 3 , such as reaction gas the silicon is exposed on by being supplied with hydrogen, and the substrate 11 in a hydrogen atmosphere A single crystal silicon film is formed on the substrate. In this selective growth, an alloy made of silicon and germanium in addition to silicon can also be grown.
Due to this epitaxial growth, as shown in the perspective view of FIG. 6, the wiring layer 22 made of a single crystal silicon film is formed on the n-type diffusion region 17 and the p-type diffusion region 19, and in particular, STI ( The first portion 22a of the wiring layer 22 is formed on the n-type diffusion region 14 positioned on both sides thereof with the 14 interposed therebetween, and the second portion of the wiring layer 22 on the p-type diffusion region 19. 22b is formed.
In addition, during this epitaxial growth, epitaxial growth proceeds using the polysilicon film 38 remaining on the inner walls of the plurality of slits 36 formed in the STI 14 as a nucleus. The silicon film grows so as to fill the inside of the slit, which also protrudes above the slit 36, and the silicon film grows so that they are integrated, so that the third portion of the wiring layer 18 follows the plurality of slits 26. 18c is formed. And this 3rd part 22c is integrated with the said 1st part 22a and the 2nd part 22b finally.
Next, when the cap member 21 is present, the cap member 21 is removed by dilute hydrofluoric acid, and the n-type impurity and the p-type impurity are diffused from the wiring layer 22 to form the n-type diffusion region 17. A second diffusion region 17b having a deep junction depth constituting the second diffusion region 19b having a deep junction depth constituting the p-type diffusion region 19 is formed.
Subsequently, as shown in the cross-sectional view of FIG. 5, after the metal film such as Ti, Co, Ni, Pd, etc. is formed on the wiring layer 22, the heat treatment is performed, so that the upper portion of the wiring layer 22 is formed. The metal silicide layer 40 is formed. At this time, a metal film is formed on the gate electrode 18, and then a metal silicide layer 40 is formed on the gate electrode 18. At the time of selective growth when the wiring layer 22 is formed, when an alloy made of silicon and germanium is grown instead of silicon, an alloy made of silicon and germanium is equivalent to the silicide layer 40. A silicided layer is formed.
According to the semiconductor device and the manufacturing method of the second embodiment, the same effect as in the first embodiment can be obtained, and the third part which connects the first part 22a and the second part 22b of the wiring layer 22 is also provided. Since the width of the 22c becomes larger than that in FIG. 3, the wiring resistance of the wiring layer 22 connecting the n-type diffusion region 17 and the p-type diffusion region 19 can be made lower than in the case of FIG. 3. Effect is obtained.
8 is a perspective view illustrating a configuration of a part of a semiconductor device according to the third embodiment of the present invention. Since the semiconductor device of the third embodiment differs only in part from the configuration of the semiconductor device according to the second embodiment shown in FIG. 6, the parts corresponding to those in FIG. 6 are given the same reference numerals, and the description thereof is omitted. Only differences from FIG. 6 will be described below.
The semiconductor device shown in FIG. 8 differs from the semiconductor device shown in FIG. 6 in that the gate electrode 18 of another MOS transistor is formed on the STI 14, and the third portion of the wiring layer 22 ( A contact plug 41 is formed on 22c, a contact plug 42 is formed on a gate electrode 18 of the other MOS transistor, and an upper wiring layer connected to both contact plugs 41 and 42. By forming 43, the third portion 22c and the gate electrode 18 of the other MOS transistor are interconnected.
Next, the manufacturing method of the semiconductor device of the structure as shown in FIG. 8 is demonstrated.
After the STI 14 is formed on the substrate 11, as shown in the perspective view of FIG. 9A, in order to form the plurality of slits, resist patterning is performed to have a pattern corresponding to the pattern of the plurality of slits. Subsequently, a plurality of slits 36 are formed by the etching of the embedding insulating film 35 in the STI 14 by 30 to 100 nm by reactive ion etching using this resist. In this example, the case where three slits 36 are formed is illustrated. The width W of these slits 36 becomes 0.03 to 0.1 micrometer, respectively, similarly to the case of 1st Embodiment.
Subsequently, impurity ions for threshold adjustment are implanted into portions that become the channel regions of the MOS transistors of both p and n channels, and are subsequently gated with a film thickness of 0.5 to 3.0 nm on the entire surface by thermal oxidation or LP-CVD. An insulating film 37 is formed. Subsequently, a polysilicon film 38 is deposited on the entire surface with a film thickness of 50 to 200 nm, and then the polysilicon film 38 is formed by an optical lithography method, an X-ray lithography method, or an electron beam lithography method. An etching mask for patterning is formed, and then the polysilicon film 38 is etched by the RIE method using the mask, so that the gate electrode 18 is formed as shown in the perspective view of FIG. 9B. . After this etching, the gate electrode 18 is also formed on the STI 14. In addition, the polysilicon film 38 remains on the inner walls of the plurality of slits 36, respectively. At this time, as shown in the perspective view of FIG. 9B, as in the case shown in FIG. 4F, the cap material 21 made of a silicon nitride film may be left on the upper portion of each gate electrode 18. The cap material 21 made of this silicon nitride film can be used as a block during epitaxial growth performed thereafter. In addition, the cap material 21 may not be formed, and then epitaxial growth may be performed on the gate electrode 18.
As the gate insulating film 37, not only a silicon oxide film but also an insulating film of any kind, such as a silicon oxynitride film, a silicon nitride film, or a film made of Ta 2 O 5 which is a high dielectric film, can be used.
Subsequently, after the thermal oxidation method, a post oxide film having a thickness of 0.5 to 6 nm is formed on the entire surface, n-type and p-type impurity ions are selectively selected for the p-type well region 12 and the p-type well region 13. The first diffusion region 17a having the shallow junction depth constituting the n-type diffusion region 17 and the first diffusion region 19a having the shallow junction depth constituting the p-type diffusion region 19 are introduced. Is formed.
Next, as shown in the perspective view of FIG. 9C, the gate sidewall material is deposited on the entire surface by the LP-CVD method, and is subsequently etched back by reactive ion etching. Gate sidewall 20 is formed. As the gate sidewall material, a film made of a silicon oxide film, a silicon nitride film, or a combination thereof can be used.
Next, after the high temperature treatment is performed in a hydrogen atmosphere to remove the native oxide film, selective growth of single crystal silicon is performed by the epitaxial growth method. For example, the whole in a hydrogen atmosphere and heated to 650~800 ℃, SiH 4, SiH 2 Cl 2, SiHCl 3 , etc. of the reaction gas in the to be supplied with hydrogen, the silicon is exposed on the substrate 11, A single crystal silicon film is formed at the portion. At the time of selective growth, an alloy made of silicon and germanium can be grown in addition to silicon.
Due to this epitaxial growth, as shown in the perspective view of FIG. 9D, a wiring layer 22 made of a single crystal silicon film is formed on the n-type diffusion region 17 and the p-type diffusion region 19, and in particular, the STI ( The first portion 22a of the wiring layer 22 is formed on the n-type diffusion region 17 positioned at both sides with the 14 interposed therebetween, and the second portion of the wiring layer 22 on the p-type diffusion region 19. 22b is formed.
In addition, during this epitaxial growth, epitaxial growth proceeds using the polysilicon film 38 remaining on the inner walls of the plurality of slits 36 formed in the STI 14 as a nucleus. The silicon film is grown so as to fill the inside of the slit, which also protrudes above the slit 36, so that the silicon film is grown so that they are integrated, so that the third portion of the wiring layer 22 conforms to the plurality of slits 36. 22c is formed. The third portion 22c is finally integrated with the first portion 22a and the second portion 22b.
Next, when the cap member 21 is present, the cap member 21 is removed by dilute hydrofluoric acid, and the n-type impurity and the p-type impurity are diffused from the wiring layer 22, so that the n-type diffusion region 17 is formed. The second diffusion region 17b having the deep junction depth constituting the lateral diffusion and the second diffusion region 19b having the deep junction depth constituting the p-type diffusion region 19 are formed. At this time, impurities are introduced into the upper portion of the gate electrode 18 at the same time.
Subsequently, as shown in the cross-sectional view of FIG. 5, a metal film such as Ti, Co, Ni, Pd or the like is formed on the wiring layer 22, and then heat treatment is performed to perform an upper portion of the wiring layer 22. The metal silicide layer 40 is formed. At this time, a metal film is formed on the gate electrode 18, and then a metal silicide layer 40 is formed on the gate electrode 18.
At the time of selective growth in forming the wiring layer 22, when an alloy made of silicon and germanium is grown instead of silicon, the alloy made of silicon and germanium is equivalent to the silicide layer 40. A silicided layer is formed.
Subsequently, after the interlayer insulating film is deposited on the entire surface, the interlayer insulating film corresponds to the position corresponding to the third portion 22c of the wiring layer 22 and the gate electrode 18 formed on the STI 14. The openings are respectively formed at positions, and the metals for the upper layer wirings are deposited on the entire surface so as to fill these openings, and then the metals for the upper layer wirings are patterned. The contact plugs 41 and 42 as shown in FIG. And an upper wiring layer 43 are formed.
According to the semiconductor device of the third embodiment and the method of manufacturing the same, the same effect as in the first embodiment can be obtained, and the width of the third portion 22c of the wiring layer 22 is large, so that a contact is made to this portion. When forming, the effect that this can be formed easily is acquired.
It is a perspective view which shows the structure of a part of semiconductor device by 4th Embodiment of this invention. Since the semiconductor device of this fourth embodiment is only partially different in structure from the semiconductor device according to the third embodiment shown in FIG. 8, parts corresponding to those of FIG. 8 are given the same reference numerals, and description thereof is omitted. Only differences from FIG. 8 will be described below.
The difference between the semiconductor device shown in FIG. 10 and the semiconductor device shown in FIG. 8 is that the third portion 22c of the wiring layer 22 formed on the STI 14 has a plurality of slits in the STI 14. And formed to span the other gate electrode 18 formed on the STI 14 and electrically connected to the gate electrode 18, and further comprising a first layer of the wiring layer 22. The point is integrated with the second portions 22a and 22b.
Next, the manufacturing method of the semiconductor device of the structure as shown in FIG. 10 is demonstrated.
In addition, a plurality of slits 36 are formed in the STI 14, and the second diffusion region having a deep junction depth constituting the gate electrode 18, the n-type diffusion region 17, and the p-type diffusion region 19. Since the process until (17b, 19b) is formed is basically the same as the process shown to FIG. 9A-9C by 3rd Embodiment, these description is abbreviate | omitted. 9C, however, as shown in the perspective view of FIG. 11A, the gate electrode 18 formed on the STI 14 crosses the plurality of slits 36 so as to cross the plurality of slits 36. It is formed extending in the same direction as the extending direction. Also in this case, when the polysilicon film 38 for forming the gate electrode 18 is deposited, the polysilicon film 38 is also deposited on each inner wall of the plurality of slits 36.
As shown in the perspective view of FIG. 11A, the gate sidewall material is deposited on the entire surface by the LP-CVD method, and subsequently etched back by reactive ion etching, whereby the gate sidewall 20 is formed on the sidewall of each gate electrode 18. ) Is formed. As the gate sidewall material, a film made of a silicon oxide film, a silicon nitride film, or a combination thereof can be used. Subsequently, n-type and p-type impurity ions are selectively introduced into the p-type well region 12 and the n-type well region 13 to form the n-type diffusion region 17 and the p-type diffusion region 19. Second diffusion regions 17b and 19b having deep junction depths are formed.
Next, as shown in the perspective view of FIG. 11B, the gate sidewall 20 is selectively removed at the position where the gate electrode 18 on the STI 14 and the plurality of slits 36 intersect.
Thereafter, the epitaxial growth method is performed to form the wiring layer 22.
Next, when the cap material 21 is present, the cap material 21 is removed by dilute hydrofluoric acid, n-type impurities and p-type impurities are diffused from the wiring layer 22, and the n-type diffusion region 17. The second diffusion region 17b having a deep junction depth constituting the C) and the second diffusion region 19b having a deep junction depth constituting the p-type diffusion region 19 are formed. At this time, impurities are introduced into the gate electrode 18 at the same time.
In addition, as shown in FIG. 5, a metal film such as Ti, Co, Ni, Pd, or the like is formed on the wiring layer 22, and then a heat treatment is performed to form a metal silicide layer on the wiring layer 22. By forming 40, the structure shown in FIG. 10 is obtained. At this time, a metal film is formed on the gate electrode 18, and then a metal silicide layer 40 is formed on the gate electrode 18. At the time of selective growth in forming the wiring layer 22, when an alloy made of silicon and germanium is grown instead of silicon, the alloy made of silicon and germanium is equivalent to the silicide layer 40. A silicided layer is formed.
According to the semiconductor device and the manufacturing method of the fourth embodiment, the same effects as in the first embodiment can be obtained, and also the same functions as the contact plugs 41 and 42 and the wiring layer 43 in the upper layer in FIG. 8. In the third portion 22c of the wiring layer 22, the gate of the MOS transistor different from the n-type diffusion region 17 and the p-type diffusion region 19 without using a contact plug or an upper wiring layer. The effect that the electrode 18 can be connected is obtained.
In addition, this invention is not limited to said each embodiment, Of course, a various deformation | transformation is possible. For example, in each of the above embodiments, the case where the diffusion regions of the MOS transistors connected by the wiring layer 22 are different from each other is described. However, the diffusion layers of the same conductivity type of the MOS transistors having the same channel type are the wiring layers 22. ) May be connected.
In each of the above embodiments, a case has been described in which a pair of diffusion regions serving as a source and a drain of different MOS transistors are connected by using the wiring layer 22, but this is separated from each other by STI and formed in the substrate. The pair of conductive layers composed of regions and used as wirings can be easily applied to the case where the wiring layers 22 are used to connect each other.
In addition, although each case mentioned above demonstrated the case where a p-type board | substrate is used as a board | substrate, you may use this n-type board | substrate.
The above-described embodiments are to be considered in all respects only as illustrative and not restrictive. It is intended that the scope of the invention be defined not by the foregoing description of the embodiments, but rather by the claims, and shall include such modifications as come within the meaning and range equivalent to the claims.
According to the present invention, the problem of junction leakage can be solved and the circuit area can be greatly reduced.
1 is a cross-sectional view showing an example of a conventional semiconductor device.
FIG. 2 is a cross-sectional view showing an example of a conventional semiconductor device different from FIG. 1. FIG.
FIG. 4A is a cross-sectional view showing the first manufacturing process when manufacturing the semiconductor device shown in FIG. 3, FIG. 4B is a cross-sectional view showing the manufacturing process following FIG. 4A, and FIG. 4C is a manufacturing subsequent to FIG. 4B. 4D is a sectional view showing the manufacturing process following FIG. 4C, FIG. 4E is a perspective view showing the manufacturing process following FIG. 4D, and FIG. 4F is a sectional view showing the manufacturing process following FIG. 4E. 4G is a perspective view illustrating the manufacturing process following FIG. 4F.
FIG. 5 shows a detailed cross-sectional structure along the line AA ′ in FIG. 3. FIG.
FIG. 6 is a perspective view showing a configuration of a part of a semiconductor device according to a second embodiment of the present invention. FIG.
FIG. 7A is a perspective view showing a manufacturing process in the middle of manufacturing the semiconductor device shown in FIG. 6, FIG. 7B is a perspective view showing a manufacturing process following FIG. 7A, and FIG. 7C is a manufacturing subsequent to FIG. 7B. A perspective view showing the process.
8 is a perspective view showing a configuration of a part of a semiconductor device according to a third embodiment of the present invention.
FIG. 9A is a perspective view showing a manufacturing process in the middle of manufacturing the semiconductor device shown in FIG. 8, FIG. 9B is a perspective view showing a manufacturing process following FIG. 9A, and FIG. 9C is a manufacturing subsequent to FIG. 9B. It is a perspective view which shows a process, FIG. 9D is a perspective view which shows the manufacturing process following FIG. 9C.
FIG. 10 is a perspective view showing a configuration of a part of a semiconductor device according to a fourth embodiment of the present invention. FIG.
FIG. 11A is a perspective view illustrating a manufacturing process in the middle of manufacturing the semiconductor device shown in FIG. 10, and FIG. 11B is a perspective view illustrating a manufacturing process subsequent to FIG. 11A.
51: p-type substrate
52: p-type well region
53: n-type well region
54: n-channel MOS transistor
55: n-type region
56 p-channel MOS transistor
57: p-type region
58: STI
59: gate electrode
60: interlayer insulating film
61: opening
62: conductive material
In a semiconductor device in which active regions are connected by a wiring layer,
First and second transistors formed on the semiconductor substrate and spaced apart from each other, each having an active region;
An isolation region formed on the semiconductor substrate and formed between the first and second transistors and separating the first and second transistors;
At least one slit formed so as to be continuous between the active regions of the first and second transistors in the isolation region and having an inner wall portion and having a predetermined width;
A conductive film formed on the inner wall portion of the at least one slit,
First and second portions respectively formed on the active regions of the first and second transistors and electrically connected to the active regions, and along the slit of the isolation region. And a wiring layer formed of a third portion integrated with the first and second portions.
And said at least one slit is one slit.
The at least one slit is a plurality of slits formed to be parallel to each other.
The minimum value of the width | variety of the said at least 1 slit becomes a minimum dimension of processing precision, and a maximum value is a semiconductor device whose maximum value is the maximum value which the said slit can substantially embed by the said 3rd part of the said wiring layer.
The minimum value of the width of the said slit is 0.03 micrometer, and the maximum value is 0.1 micrometer.
And the at least one slit is formed such that its bottom portion does not reach the bottom portion of the separation region.
A semiconductor device in which the conductive film is made of a film containing silicon.
A semiconductor device in which the film containing silicon is polycrystalline silicon.
The said wiring layer has a laminated structure in which a lower layer consists of a silicon layer and an upper layer consists of a metal silicide layer.
The said wiring layer is a semiconductor device which has a laminated structure which consists of a layer in which the lower layer made the silicon germanium alloy layer, and the upper layer silicided the silicon germanium alloy.
And a contact portion formed on the third portion of the wiring layer.
First and second MOS transistors formed on the semiconductor substrate and spaced apart from each other, each having a gate electrode and an active region;
A separation region formed on the semiconductor substrate and formed between the first and second MOS transistors and separating the first and second MOS transistors;
At least one slit formed so as to be continuous between the active regions of the first and second MOS transistors in the isolation region and having an inner wall portion and having a predetermined width;
A gate electrode formed on the isolation region;
The separation along the at least one slit of the first and second portions formed on the respective active regions of the first and second MOS transistors, the first and second portions electrically connected to the respective active regions, and the isolation region. A wiring layer formed to cover the gate electrode formed on the region and electrically connected to the gate electrode, the wiring layer comprising a third portion integrated with the first and second portions
The at least one slit is formed so that the bottom part does not reach the bottom part of the said separation area | region.
In the manufacturing method of the semiconductor device with which active areas are connected by the wiring layer,
By forming isolation regions on the semiconductor substrate, first and second device regions separated from each other by the isolation regions are formed in the semiconductor substrate,
Forming at least one slit having an inner wall portion and having a predetermined width so as to be continuous between the first and second element regions in the separation region,
After depositing a conductive film made of a material capable of becoming a nucleus for epitaxial growth on the entire surface, the conductive film is selectively removed to remain on some regions of the first and second device regions, and the at least one Leaving on the inner wall of the slit,
After covering the periphery of the conductive film left on the partial regions of the first and second element regions with a material that is a block for epitaxial growth, the first and second regions are firstly formed on the first element region by an epitaxial growth method. A wiring layer having a third portion, a second portion on the second element region, and located on the isolation region so as to follow the slit of the isolation region and having a third portion integrated with the first and second portions; The manufacturing method of the semiconductor device to form.
A method for manufacturing a semiconductor device, wherein one slit is formed when the at least one slit is formed in the separation region.
A plurality of slits are formed so as to be parallel to each other when the at least one slit is formed in the separation region.
Wherein the at least one slit is formed such that the minimum value of its width is the minimum dimension of machining accuracy and the maximum value is the maximum value that the slit can substantially fill by the third portion of the wiring layer. Manufacturing method.
The at least one slit is formed so that the minimum value of the width may become 0.03 micrometer and the maximum value may be 0.1 micrometer.
When forming the at least one slit in the isolation region, the bottom portion thereof is formed so as not to reach the bottom portion of the isolation region.
And the conductive film is formed of a film containing silicon.
A method for manufacturing a semiconductor device, wherein the film containing silicon is formed of polycrystalline silicon.
The said wiring layer is a manufacturing method of the semiconductor device formed so that a lower layer may have a laminated structure which consists of a silicon layer and an upper layer is a metal silicide layer.
The said wiring layer is formed so that a lower layer may have a laminated structure which consists of a silicon germanium alloy layer, and the upper layer consists of a layer which silicided the silicon germanium alloy.
And forming a contact portion on the third portion of the wiring layer.
After depositing a conductive film made of a material capable of becoming a nucleus for epitaxial growth on the entire surface, the conductive film is selectively removed to remove the conductive film on the partial region of the first and second device regions and the partial region of the isolation region. Leaving each on the inner wall of the at least one slit,
Covered with a material serving as a block for epitaxially growing the periphery of the conductive film remaining on the partial region of the first and second device regions and on the partial region of the isolation region, respectively,
Selectively removing the material serving as the block in the portion located near the at least one slit formed in the separation region among the material serving as the block covering the conductive film remaining on the partial region of the separation region,
The epitaxial growth method has a first portion on the first element region, a second portion on the second element region, and the material that becomes the block along the slit in the isolation region is removed. A method for manufacturing a semiconductor device, wherein a wiring layer having a third portion integrated with the first and second portions is formed continuously so as to cover the conductive film on the partial region of the isolation region.
Wherein the at least one slit is formed such that the minimum value of its width is the minimum dimension of machining accuracy and the maximum value is the maximum value that the slit can substantially fill by the third portion of the wiring layer. Way.
KR20020083275A 2001-12-25 2002-12-24 Semiconductor device and method of manufacturing the same KR100538719B1 (en)
JPJP-P-2001-00392569 2001-12-25
KR20030058919A KR20030058919A (en) 2003-07-07
KR100538719B1 true KR100538719B1 (en) 2005-12-26
KR20020083275A KR100538719B1 (en) 2001-12-25 2002-12-24 Semiconductor device and method of manufacturing the same
CN105470293B (en) * 2014-08-28 2020-06-02 联华电子股份有限公司 Semiconductor element and manufacturing method thereof
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