WO2011004474A1 - 半導体装置及びその製造方法 - Google Patents
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Definitions
- the present invention relates to a semiconductor device using a high mobility channel material in a channel region of a MIS (Metal Insulator Semiconductor) FET and a manufacturing method thereof.
- MIS Metal Insulator Semiconductor
- the opening region of the SiO 2 layer formed on the Si substrate is used as a seed portion for crystal growth, and from this seed portion to the region covered with the SiO 2 layer III
- a method of laterally growing a ⁇ V group semiconductor for example, see Non-Patent Document 1.
- this method has a problem that the seed portion becomes an area penalty and the integration degree of the high mobility channel material MISFET is lowered.
- An object of the present invention is to provide a semiconductor device that can be formed on a substrate containing Si as a main component and a manufacturing method thereof for a MISFET having a high mobility channel material while maintaining the crystallinity of the channel material. It is to provide.
- a method for manufacturing a semiconductor device comprising: a support substrate having Si 1-x Ge x (0 ⁇ x ⁇ 0.5) having a [110] direction perpendicular to the surface in a surface portion; Forming a dummy gate on the surface portion so that a gate length direction is a [111] direction orthogonal to the [110] direction; and using the dummy gate as a mask, a source / drain is formed on the surface portion of the substrate.
- a semiconductor device includes Si 1-x Ge x (x ⁇ 0.5) whose crystal orientation in the direction perpendicular to the surface is [110] in the surface portion of the support substrate. , Source / drain regions provided on the ⁇ 111 ⁇ plane, which are provided apart from each other in the [111] direction orthogonal to the [110] direction and whose surface orientation in the channel length direction is orthogonal to the [110] direction And a channel region made of a III-V semiconductor or Ge provided between the source / drain regions, and a gate electrode provided on the channel region via a gate insulating film. And
- a MISFET having a high mobility channel material can be formed with high density on a substrate containing Si as a main component while maintaining the crystallinity of the channel material.
- FIG. 3 is a cross-sectional view showing the element structure of the MISFET according to the first embodiment. Sectional drawing which shows the manufacturing process of MISFET concerning 1st Embodiment.
- FIG. 5 is a cross-sectional view perpendicular to the channel length direction of the channel region in the MISFET of FIG. 4. Sectional drawing which is a modification of 1st Embodiment and shows the example which avoids an offset area
- Sectional drawing which shows the example which dug the BOX layer prior to the growth of III-V group material. The figure which shows the relationship between the channel length direction in Si (110) plane, and conductivity. Sectional drawing which shows the element structure of MISFET concerning 3rd Embodiment. Sectional drawing which shows the manufacturing process of MISFET concerning 3rd Embodiment. The perspective view which shows the element structure of MISFET concerning 4th Embodiment. The perspective view which shows the manufacturing process of MISFET concerning 4th Embodiment. It is a modification of 4th Embodiment and is sectional drawing of a channel area
- FIGS. 1A and 1B schematically show this example.
- an SiO 2 opening region 2 is formed at a desired location on the Si (111) surface covered with the SiO 2 film 1 as an insulating film.
- the group III-V semiconductor is vapor-grown with respect to the structure of FIG. 1A, the upper surface is selectively formed on the SiO 2 opening region 2 as shown in FIG.
- the (110) plane is perpendicular to the (-111) plane and the (1-1-1) plane. Therefore, in the case of the (110) substrate, it is possible to form a recess made up of the ( ⁇ 111) plane and the (1-1-1) plane that are perpendicular to the surface.
- FIGS. 2A and 2B schematically show this. 2A and 2B, 5 indicates a source region, 6 indicates a drain region, Lg indicates a channel length (gate length), and W indicates a channel width (gate width).
- the MISFET is arranged on the (110) substrate so that the channel length direction (the direction connecting the source region 5 and the drain region 6) is the ⁇ 111> direction. Then, when the channel portion is etched vertically, the exposed side surfaces of the source region 5 and the drain region 6 become a ( ⁇ 111) plane and a (1-1 ⁇ 1) plane, respectively, as shown in FIG. On the other hand, in the case of the (001) substrate or (111) substrate which is another main low index surface, the surface and the ⁇ 111 ⁇ plane are not in a vertical relationship.
- the case where the upper surface is the (110) plane and the side surfaces are the ( ⁇ 111) plane and the (1-1-1) plane is given, but the scope of the present invention is not limited to this specific index plane. It also includes a combination of crystal planes equivalent to this. As shown in FIG. 3, there are a total of 12 exponential surfaces equivalent to the (110) plane including the (110) plane. Further, when one of them is a surface, there are two pairs of ⁇ 111 ⁇ planes perpendicular to the surface and facing each other. Therefore, when any of the ⁇ 110 ⁇ planes is selected as the plane orientation of the upper surface of the substrate, the plane orientation of the side faces of the source / drain regions is set to be the ⁇ 111 ⁇ plane orthogonal to the selected [110] plane. Good. In the following description, the case of the upper surface (110) plane, the side surface (-111) plane, and the (1-1-1) plane will be described as representatives among combinations of equivalent crystal planes.
- FIG. 4 is a cross-sectional view showing the element structure of the MISFET according to the first embodiment of the present invention, and particularly shows a cross section along the channel length direction.
- an SOI substrate in which a buried insulating layer (BOX) 12 is formed on a Si substrate 11 and a Si layer (SOI layer) 13 is formed thereon is used as a support substrate.
- a MISFET having a source region 21, a drain region 22, a channel region 23, a gate insulating film 24, and a gate electrode 25 is formed on the SOI substrate 10.
- the source / drain regions 21 and 22 are formed from the Si layer 13, and the crystal orientation in the direction perpendicular to the substrate surface is ⁇ 110>.
- the channel region 23 sandwiched between the source / drain regions 21 and 22 is formed of a III-V semiconductor material.
- the direction perpendicular to the interface between the source region 21 and the channel region 23 is ⁇ 111>, and the direction perpendicular to the interface between the drain region 22 and the channel region 23 is ⁇ 1-1-1>.
- a sidewall insulating film 26 is formed on the side surface of the gate stack including the gate insulating film 24 and the gate electrode 25.
- the surface of the substrate on which these portions are formed is covered with an interlayer insulating film 27, and the surface of the interlayer insulating film 27 is flattened.
- the surface of the interlayer insulating film 27 has the same height as the surface of the gate electrode 25.
- an SOI substrate (support substrate) 10 having an Si layer 13 whose upper surface is a (110) plane is prepared.
- a MISFET is formed by a normal so-called gate-first process in an orientation in which the channel length direction is ⁇ 111>.
- a gate pattern is defined by resist patterning.
- the resist pattern is transferred by dry etching, and gate electrode patterning is performed.
- impurities are implanted into the Si layer 13 at a high concentration, and a thermal activation process is performed, thereby forming the source region 21 and the drain region 22.
- the sidewall insulating film 26 is formed by self-alignment by depositing the insulating film and dry etching, and finally the interlayer insulating film 27 is deposited to flatten the surface.
- the channel region is made of Si. This is called a dummy channel region.
- a dummy gate insulating film 31 and a dummy gate electrode 32 are formed on the upper portion of the dummy channel region.
- the source region 21 and the drain region 22 are formed from highly doped Si.
- a Si 1-x Ge x (x ⁇ 0.5) layer may be epitaxially grown on the Si layer 13 and used as a channel region.
- the hole mobility of SiGe is about twice as high as that of Si, and is effective as a high mobility channel material of pMOS.
- the SiGe layer is grown before the dummy gate insulating film is formed, and the channel region is replaced with the III-V group by the channel post-fabrication process of this embodiment only with the nMOS, the nMOS becomes the III-V channel and the pMOS becomes the SiGe channel. Therefore, there is no need to perform a post-fabrication flow for the pMOS, and the manufacturing cost can be reduced.
- the source / drain region is an SiGe layer for both nMOS and pMOS.
- the composition ratio x of Ge in Si 1-x Ge x is preferably 0 or more and 0.5 or less, and is preferably 0.25 to 0.35, for example.
- x in Si 1-x Ge x increases, the hole mobility increases while the heat resistance of SiGe tends to decrease.
- x exceeds 0.5 the resistance to a high temperature thermal load of about 1000 ° C. in the activation annealing process of the source / drain region is lost. In this embodiment, it becomes impossible to form a dummy gate stack by the gate first process.
- the thickness d is preferably 5 nm or more and 15 nm or less, for example, 7 nm. This is because the thickness of the inversion layer formed in the channel region when the MISFET is ON is about 15 nm to 5 nm depending on the gate bias. On the other hand, an excessively thick SiGe layer is difficult to epitaxially grow.
- SiGe has a larger lattice constant than Si, when the III-V group is grown using the source region end and the drain region end as a seed portion, the lattice mismatch between the seed portion and the channel region is reduced, resulting in a higher It is also possible to form a quality channel.
- the trench 33 is formed by removing the dummy gate electrode 32, the dummy gate insulating film 31, and the dummy channel region using the insulating films 26 and 27 as a mask.
- the ( ⁇ 111) plane and the (1-1-1) plane are exposed at the end of the source region and the end of the drain region, respectively.
- a step of smoothing the ⁇ 111 ⁇ plane at the end of the source region and the end of the drain region may be performed.
- This ⁇ 111 ⁇ plane serves as a seed portion for crystal growth in the next group III-V vapor phase growth.
- the smoothing step one or both of the following two may be performed.
- Si wet etching with tetramethylammonium hydroxide aqueous solution (TMAH) or hydrazine hydrate solution (H 2 NNH 2 ⁇ H 2 O) is an anisotropic etching with a slow etch rate on the ⁇ 111 ⁇ surface, removing roughness. This is effective for forming a flat ⁇ 111 ⁇ plane at the atomic level.
- the other is high-temperature heat treatment in an H 2 atmosphere.
- the Si surface is removed by two actions of removing the oxide on the Si surface by the reducing action of H 2 and facilitating the Si surface diffusion, and activating the Si surface diffusion by increasing the temperature.
- treatment at 1000 ° C. for 3 minutes can remove roughness and obtain a flat Si surface at the atomic level [for example, R. Hiruta, Applied Surface, Science Vol.237, p63-67 (2004)].
- a channel region 23 made of a III-V semiconductor is formed between the source / drain regions 21 and 22.
- a III-V group material is formed on the end of the source region consisting of the ( ⁇ 111) plane and the end of the drain region consisting of the (1-1-1) plane, respectively.
- the growth layer 23a to be formed is selectively grown.
- the channel region 23 is formed by connecting the left and right growth layers 23a.
- the cross-sectional shape perpendicular to the channel length direction of the channel region 23 formed in this way is a polygon of four or more corners composed of ⁇ 110 ⁇ crystal planes, as shown in FIGS. 6 (a) to (c). Tend. In either case, the channel length direction is ⁇ 111>. In FIGS. 6A to 6C, the front and back direction of the paper is the channel length direction.
- the cross section is a hexagon having (110), (101), (0-11), (-1-10), (-10-1), (01-1) planes. Yes.
- FIG. 6B in addition to FIG. 6A, it is an octagon having a groove portion formed of (0-11) and (-10-1) planes.
- FIG. 6C it is a quadrangle (trapezoid) of (110), (01-1), (-1-10), (101).
- the ⁇ 110 ⁇ plane is a stable crystal plane with a low surface energy as described in (Basic Technology 1), but the ⁇ 110 ⁇ plane on the side is flat at the atomic level because of the low surface energy. Tend to be. As a result, the interface between the channel portion and the gate insulating film finally becomes flat at the atomic level. The higher the flatness of the channel / gate insulating film interface, the more frequently the carrier traveling in the channel length direction in the surface inversion layer is scattered by roughness, and the current driving force increases. Therefore, the channel shape as shown in FIG. 6A contributes to improvement in device performance.
- the group III-V material can be selected from the group consisting of GaP, AlP, GaAs, AlAs, InP, InAs, GaSb, AlSb, InSb, InGaAs, and InGaNAs.
- the structure shown in FIG. 4 is completed by forming the gate insulating film 24 and the gate electrode 25.
- the gate insulating film 24 can be selected from the group consisting of Al 2 O 3, HfO 2 , La 2 O 3 , Ta 2 O 5 , LaAlO, LaAlSiO, HfSiO, HfSiON, HfLaSiON, HfAlSiON, HfTaSiON, and HfLaAlSiON. .
- the deposition method of the gate insulating film 24 can be selected from MOCVD, ALD, sputtering, and combinations thereof. After forming the gate insulating film 24, nitrogen may be introduced by plasma nitriding.
- the gate electrode 25 can be selected from the group consisting of TiN, Al, TiAl, TiAlN, HfSi, HfC, HfCN, TaC, TaN, W, WN, Mo, MoN.
- the deposition method of the gate electrode 25 can be selected from MOCVD, ALD, sputtering, and combinations thereof.
- the metal filling rate of a recessed part can be improved by suitable temperature heat processing after deposition.
- the gate insulating film 24 is deposited in the step of FIG. 5F, the gate insulating film 24 is also deposited on the side surface of the groove. For this reason, as shown in FIG. 7A, offset regions that are not controlled by the gate electrode 25 may occur at both ends of the channel region 23 in some cases.
- the in-situ doped Si or the in-situ doped III-V group is added to the gate insulating film 24. It is effective to grow it to a thickness of about.
- These “in-situ doped” Si and “in-situ doped” III-V groups function as part of the source or drain. This state is shown in FIG. 29 in the figure is an “in-situ” doped “Si” layer.
- the sidewall of the gate is etched back to the thickness of the gate insulating film 24 by wet etching or the like prior to the vapor phase growth process of the III-V group material in FIGS. It is valid. This state is shown in FIG. Since the sidewall insulating film 26 is etched back, offset can be avoided even if the gate insulating film 24 is formed on the side surface of the sidewall insulating film 26.
- the bottom surface of the grown group III-V structure is in contact with the BOX layer, but the top surface is not so. Due to this, the growth rate is different between the upper and lower parts of the III-V group, and the homogeneity may be deteriorated. In order to avoid this, it is effective to excavate the BOX layer to some extent prior to the growth of the III-V group. This is shown in FIGS. 8 (a) and 8 (b).
- the exposed embedded insulating layer 12 is etched by a certain amount to form a BOX digging region 34.
- a channel region 23 made of a III-V group semiconductor is selectively grown.
- the upper and lower surfaces of the III-V structure are closer to each other, and an improvement in homogeneity can be expected.
- the (-111) plane and the (1-1-1) plane appearing at the source end and the drain end, respectively, are used as a seed portion to cross the III-V group. It is formed by growing in the direction.
- Patent Document 1 uses a III-V group material for the channel region, SiGe is used for the source / drain regions, and (Patent Document 2) has a wider energy band gap than Si.
- the semiconductor material discloses a structure in which Si containing impurities is used in the source / drain region, it does not mention the definition of the crystal orientation of the source / drain region.
- the crystal orientation in the direction perpendicular to the substrate surface of the source region and the drain region is ⁇ 110>
- the direction perpendicular to the interface between the source region and the channel region is ⁇ 111. >
- the crystal plane orientation rule is defined as ⁇ 1-1-1> in the direction perpendicular to the interface between the drain region and the channel region.
- This crystal plane orientation rule has an important role in forming a high-quality III-V channel portion. That is, only when this crystal plane orientation regulation is set, both ends of the facing source region and drain region corresponding to both ends of the concave portion after removing the dummy gate become ⁇ 111 ⁇ planes.
- Si ⁇ 111 ⁇ at the end of the source / drain region is used as a seed portion, and III-V group is selectively epitaxially grown from both ends, and finally the recess is filled with III-V group. Is the channel region.
- the thus formed III-V channel portion can have favorable characteristics in terms of device characteristics such as high crystallinity, high crystal orientation, high flatness, and an extremely steep interface with the source or drain.
- the [111] direction which is the preferential growth direction of III-V
- the group III-V priority is given to a direction different from the channel length direction.
- Directional growth occurs. For this reason, it is difficult to form a channel portion having high crystal orientation and high flatness.
- the ⁇ 111 ⁇ plane is the most advantageous surface as a seed part when the III-V group is epitaxially grown with high quality.
- the crystal plane orientation regulation of this embodiment (1) an increase in the carrier injection rate from the source region to the channel region, and (2) the source region, the drain region, and the source region / channel region
- the current driving force can be increased due to the two factors of reduction of the interface resistance. This is because, in the Si (110) plane, the conduction mass of electrons in the [111] direction is smaller than that in other directions as shown in FIG.
- MISFET since the resistance of the channel part itself is small and the ratio of controlling the driving current is low, it is particularly important to improve the injection rate from the source.
- the gate length (Lg) becomes finer, the resistance of the channel portion decreases. Therefore, the driving current is affected by the parasitic resistance and the injection rate of carriers from the source. These influences become apparent when Lg is 150 nm or less, and are particularly remarkable when the Lg is 50 nm or less. Therefore, the setting of the crystal plane orientation regulation of the present embodiment is particularly effective for the high mobility channel material MISFET having Lg of 150 nm or less, and the effect is further increased when Lg is 50 nm or less.
- the crystal orientation of the interface between the source region, the drain region, and their channel region is cut out from the MISFET by a pickup method using FIB (Focused Ion Beem), and the cross section is imaged with a high resolution transmission electron microscope (HRTEM). It can be clarified by analyzing by transmission electron diffraction (TED).
- FIB Fluorous Ion Beem
- Non-Patent Document 1 and the formation method of the present embodiment both include III-V group crystal growth using the Si ⁇ 111 ⁇ plane as a seed part.
- (Non-Patent Document 1) uses lateral growth with the Si (111) surface of the SiO 2 opening as a seed part, and therefore an area penalty corresponding to the seed part is inevitable.
- the source region end portion composed of the ( ⁇ 111) plane and the drain region end portion composed of the (1-1-1) plane function as a seed portion. There is no specific area penalty. As a result, a high-quality crystal growth of a high mobility channel material using Si ⁇ 111 ⁇ as a seed part without an area penalty becomes possible.
- a channel region, a gate insulating film, and a gate electrode are formed after high temperature activation annealing of the source and drain. This is referred to as a channel-last process.
- the high temperature thermal load on the gate stack significantly degrades the properties of both the high mobility material channel / gate insulating film and the gate insulating film / gate electrode interface. However, this can be avoided by using the channel last-process.
- Non-Patent Document 1 is a channel-fist process, and high temperature thermal load on the gate stack cannot be avoided.
- Patent Document 2 is a channel-last-process similar to the formation method of the first embodiment, but has no crystal plane orientation regulation and cannot use the Si ⁇ 111 ⁇ plane as a seed part. High quality crystal growth of channel material is not possible.
- the formation method of the present embodiment has a structure in which the limited crystal plane orientation is defined, so that Si ⁇ 111 ⁇ is seeded without an area penalty in a channel last process that can avoid a high temperature thermal load.
- the channel region of high mobility material can be formed by high quality crystal growth.
- a MISFET having the same structure as in the first embodiment except that the channel region 23 is made of Ge is formed in the same manner as in the first embodiment except for a method of forming the Ge channel region. It is formed by the method. That is, a MISFET having source / drain regions 21 and 22 made of Si whose crystal orientation perpendicular to the substrate surface is ⁇ 110> and a channel region 23 made of Ge whose channel length direction is ⁇ 111> is dummy. Through the step of removing the channel region, Ge is formed by lateral growth using the ( ⁇ 111) plane and the (1-1-1) plane appearing at the source end and the drain end as seed parts, respectively.
- Ge has a hole mobility about four times that of Si, and is particularly promising as a high mobility channel material for p-type MISFETs.
- the interface between the Ge channel region and the source / drain region and the interface between the Ge channel region and the gate insulating film are vulnerable to high-temperature heat load.
- the Ge channel MISFET can be formed on the Si substrate with high density and high quality.
- FIG. 10 is a cross-sectional view showing the element structure of the MISFET according to the third embodiment of the present invention, and in particular, shows a cross section along the channel length direction. 10 and 41, 51 to 57 in FIG. 10 correspond to 11, 21 to 27 in FIG.
- This embodiment is different from the first embodiment described above in that a bulk substrate is used instead of the SOI substrate.
- the source region 51 and the drain region 52 are made of Si, and the crystal orientation in the direction perpendicular to the substrate surface is ⁇ 110>.
- the channel region 53 sandwiched between the source / drain regions 51 and 52 is formed of a III-V group material.
- the vertical direction of the interface between the source region 51 and the channel region 53 is ⁇ 111>, and the vertical direction of the interface between the drain region 52 and the channel region 53 is ⁇ 1-1-1>.
- a sidewall insulating film 56 is formed on the side surface of the gate stack including the gate insulating film 54 and the gate electrode 55.
- the MISFET is covered with an interlayer insulating film 57.
- FIG. 11 is a cross-sectional view showing a manufacturing process of the MISFET of FIG.
- the substrate is basically manufactured in the same process as that shown in FIGS. 5A to 5F described in the first embodiment except that the substrate is different.
- an Si substrate 41 whose upper surface is a (110) plane is prepared.
- a MISFET is formed by a normal gate first process in an orientation in which the channel length direction is ⁇ 111>.
- impurities are implanted at a high concentration to form the source region 51 and the drain region 52.
- a sidewall insulating film 56 and an interlayer insulating film 57 are deposited.
- the dummy channel region is formed from Si.
- a dummy gate insulating film 61 and a dummy gate electrode 62 are formed on the upper portion of the dummy channel region.
- the source region 51 and the drain region 52 are formed from highly doped Si.
- the III-V group material is formed from the source region end portion formed of the ( ⁇ 111) plane and the (1-1-1) plane.
- a channel region 53 is formed by selectively growing at the end of the drain region. By selecting vapor growth conditions under which the III-V group grows in the [111] preferred direction, lateral growth is possible.
- a gate insulating film 54 and a gate electrode 55 are formed as in the first embodiment.
- the high mobility channel material MISFET can be formed on the Si substrate with a high density using the bulk substrate as in the first embodiment.
- the Si substrate since it is possible to use a normal bulk Si substrate that is low in cost compared to the case where an SOI substrate is used, it is possible to reduce the manufacturing cost.
- FIG. 12 is a perspective view showing the element structure of a Fin-type MISFET according to the fourth embodiment of the present invention. Note that 71 to 73 and 81 to 87 in FIG. 12 correspond to 11 to 13 and 21 to 27 in FIG.
- an SOI substrate in which a buried insulating layer (BOX) 72 is formed on a Si substrate 71 and a Si layer (SOI layer) 73 is formed thereon is used as a support substrate.
- a Fin-type MISFET having a source region 81 and a drain region 82 formed by processing the Si layer 73 of the SOI substrate into a thin wall shape, a channel region 83, a gate insulating film 84, and a gate electrode 85 is formed.
- the source region 81 and the drain region 82 are made of Si, and the crystal orientation in the direction perpendicular to the substrate surface is ⁇ 110>.
- the channel region 83 sandwiched between the source regions 81 and 82 is formed of a III-V group material.
- the direction perpendicular to the interface between the source region 81 and the channel region 83 is ⁇ 111>, and the direction perpendicular to the interface between the drain region 82 and the channel region 83 is ⁇ 1-1-1>.
- a gate insulating film 84 covers the periphery of the channel region 83, and a gate electrode 85 covers the outer periphery of the gate insulating film 84.
- a sidewall insulating film 86 is formed on the side surface of the gate stack including the gate insulating film 84 and the gate electrode 85.
- the Fin-type MISFET is covered with an interlayer insulating film 87.
- a substrate having an SOI layer whose upper surface is a (110) plane is prepared, and the channel length direction is ⁇ 111> in a normal gate-first-process.
- a Fin-type MISFET is formed.
- the channel region is formed from Si. This is called a dummy channel region.
- a dummy gate insulating film 91 and a dummy gate electrode 92 are formed on the dummy channel region.
- the source region 81 and the drain region 82 are formed from highly doped Si.
- the dummy gate electrode 92 and the dummy gate insulating film are used using these insulating films as a mask. 91 and the dummy channel region are removed. As a result, the ( ⁇ 111) plane and the (1-1-1) plane are exposed at the end of the source region 81 and the end of the drain region 82, respectively.
- a group III-V material is selectively grown on the end of the source region consisting of the (-111) plane and the end of the drain region consisting of the (1-1-1) plane.
- the channel region 83 is formed.
- vapor growth conditions under which the III-V group grows in the [111] preferred direction lateral growth is possible.
- the structure shown in FIG. 12 is obtained by forming the gate insulating film 84 and the gate electrode 85.
- the group III-V channel region has a rectangular parallelepiped shape, but may have a hexagonal column shape as in FIG.
- the scope of the present invention also includes this case.
- this embodiment can be further advanced to produce a gate all-around MISFET.
- a step of digging a certain amount of the BOX-SiO 2 layer 72 is performed.
- the buried insulating layer 72 is dug by about 20 to 30 nm.
- a high-k insulating film and a metal gate are formed by MOCVD or ALD.
- HfSiO is formed by MOCVD, and then N is introduced by plasma nitriding to form 3 nm of HfSiON.
- about 7 nm of TiN or HfC, TaC is formed by a CVD method.
- Al or TiAl is deposited on the gate electrode portion, and a heat treatment at about 550 ° C. is performed. By applying heat treatment, the space filling rate can be increased by melting Al or TiAl.
- the gate all-around MISFET has a structure in which the gate insulating film and the gate electrode cover the entire surface of the thin-line channel, the gate electrode has extremely strong control over the electronic state of the channel and is strong against the short channel effect. It is a feature.
- the gate all-around type high mobility channel material MISFET with enhanced short channel effect resistance is obtained by (1) high crystallinity and crystal orientation of the channel portion, and (2) flatness of the channel / insulator film interface. It can be formed with a favorable characteristic in terms of device characteristics such as high performance. Therefore, according to the present embodiment, high density formation of a Fin type high mobility channel material MISFET with enhanced short channel effect resistance or a gate all-around type high mobility channel material MISFET with further enhanced short channel effect resistance. And formation on the Si substrate.
- an SOI substrate is used.
- a Fin-type MISFET or a gate all-around MISFET can be formed on a bulk Si substrate.
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Abstract
Description
III-V族半導体は、絶縁膜で覆われたSi(111)面の絶縁膜開口部(言い換えるとSi露出部)に選択的に、<111>方向の優先方向をもって成長させることが可能である。図1(a)(b)は、この例を模式的に示している。図1(a)のように、絶縁膜としてのSiO2 膜1に覆われたSi(111)表面の所望の場所に、SiO2 開口領域2を形成する。図1(a)の構造に対しIII-V族半導体を気相成長する場合、図1(b)のようにSiO2 開口領域2の上に選択的に、上面が(111)面、側面が(0-11),(01-1),(1-10),(-110),(-101),(10-1)面である六角柱形状のIII-V族半導体3からなる構造を形成することができる。
本明細書では、ある特定の結晶方向を<hkl>で、それと等価な結晶方向を総称して[hkl]で示す。同様に、ある特定の結晶面を(hkl)で、それと等価な面を総称して{hkl}で示す。(hkl)面と<hkl>方向とは、(hkl)面の垂直方向が<hkl>方向となる関係にある。
図4は、本発明の第1の実施形態に係わるMISFETの素子構造を示す断面図であり、特にチャネル長方向に沿った断面を示している。
本発明の第2の実施形態では、チャネル領域23がGeからなることを除いて第1の実施形態と同じ構造のMISFETを、Geチャネル領域の形成方法を除いて第1の実施形態と同じ形成方法により形成する。即ち、基板面に垂直方向の結晶方位が<110>であるSiからなるソース/ドレイン領域21,22と、チャネル長方向が<-111>であるGeからなるチャネル領域23を有するMISFETを、ダミーチャネル領域を除去する工程を経て、ソース端とドレイン端とに夫々現れた(-111)面と(1-1-1)面とをシード部としてGeを横方向成長させることによって形成する。
図10は、本発明の第3の実施形態に係わるMISFETの素子構造を示す断面図であり、特にチャネル長方向に沿った断面を示している。なお、図10中の41,51~57は、図4中の11,21~27に対応している。
図12は、本発明の第4の実施形態に係わるFin型MISFETの素子構造を示す斜視図である。なお、図12中の71~73,81~87は、図4中の11~13,21~27に対応している。
以上、具体例を参照しつつ本発明の実施の形態について説明した。しかし、本発明はこれらの具体例に限定されるものではない。即ち、これら具体例に、当業者が適宜設計変更を加えたものも、本発明の特徴を備えている限り、本発明の範囲に包含される。例えば、前述した各具体例が備える各要素及びその配置、材料、条件、形状、サイズなどは、例示したものに限定されるわけではなく適宜変更することができる。
2…SiO2 開口領域
3…III-V族半導体
10…SOI基板(支持基板)
11,41,71…Si基板
12,72…埋め込み絶縁膜(BOX)
13,73…Si層(SOI層)
5,21,51,81…ソース領域
6,22,52,82…ドレイン領域
23,53,83…チャネル領域
24,54,84…ゲート絶縁膜
25,55,85…ゲート電極
26,56,86…側壁絶縁膜
27,57,87…層間絶縁膜
29… in-situ doped Si層
31,61,91…ダミーゲート絶縁膜
32,62,92…ダミーゲート電極
33…溝部
34…BOX掘り込み領域
Claims (7)
- 表面と垂直方向な結晶方位が[110]方向のSi1-x Gex(0≦x<0.5)を表面部に有する支持基板の表面部上に、ゲート長方向が前記[110]方向と直交する[111]方向となるようにダミーゲートを形成する工程と、
前記ダミーゲートをマスクに用いて前記基板の表面部にソース/ドレイン領域を形成する工程と、
前記ソース/ドレイン領域の形成後に、前記ダミーゲートの側部に絶縁膜を埋め込み形成する工程と、
前記絶縁膜をマスクに用いて前記ダミーゲートをエッチングし、更に前記ソース/ドレイン領域間の前記基板の表面部をエッチングする工程と、
前記基板の表面部のエッチングにより露出した前記ソース/ドレイン領域の端部をシードとして用い、前記ソース/ドレイン領域間にIII-V族半導体又はGeからなるチャネル領域を成長する工程と、
前記チャネル領域上にゲート絶縁膜を介してゲート電極を形成する工程と、
を含むことを特徴とする半導体装置の製造方法。 - 前記チャネル領域を成長する前に、前記露出した前記ソース/ドレイン領域の端部に対し、{111}面のエッチングレートが他の面よりも遅い異方性ウェットエッチング、又はH2 雰囲気中の高温熱処理を用いて、{111}面を平滑化することを特徴とする請求項1記載の半導体装置の製造方法。
- 前記支持基板は、埋め込み絶縁膜上に前記Si1-x Gex からなる半導体層が形成されたSOI基板であり、前記基板の表面部のエッチング時に、前記半導体層だけでなく、前記埋め込み絶縁膜の一部をエッチングすることを特徴とする請求項1記載の半導体装置の製造方法。
- 前記チャネル領域の周囲全面に前記ゲート絶縁膜を介して前記ゲート電極を形成することを特徴とする請求項3記載の半導体装置の製造方法。
- 支持基板の表面部に、表面と垂直方向な結晶方位が[110]方向のSi1-x Gex(x<0.5)からなり、前記[110]方向と直交する[111]方向に離間して設けられ、且つチャネル長方向の側面の面方位が前記[110]方向と直交する{111}面に形成されたソース/ドレイン領域と、
前記ソース/ドレイン領域間に設けられた、III-V族半導体又はGeからなるチャネル領域と、
前記チャネル領域上にゲート絶縁膜を介して設けられたゲート電極と、
を具備したことを特徴とする半導体装置。 - 前記チャネル領域のチャネル長方向と垂直な断面の形状が{110}面からなる多角形であることを特徴とする請求項5に記載の半導体装置。
- 前記チャネル領域のチャネル長方向の長さが150nm以下であることを特徴とする請求項5に記載の半導体装置。
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KR1020117031180A KR101354844B1 (ko) | 2009-07-08 | 2009-07-08 | 반도체 장치 및 그의 제조 방법 |
CN200980160136.6A CN102473642B (zh) | 2009-07-08 | 2009-07-08 | 半导体装置及其制造方法 |
PCT/JP2009/062463 WO2011004474A1 (ja) | 2009-07-08 | 2009-07-08 | 半導体装置及びその製造方法 |
JP2011521740A JP5355692B2 (ja) | 2009-07-08 | 2009-07-08 | 半導体装置及びその製造方法 |
US13/344,107 US8653560B2 (en) | 2009-07-08 | 2012-01-05 | Semiconductor device and fabrication method thereof |
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US20120139007A1 (en) | 2012-06-07 |
US8653560B2 (en) | 2014-02-18 |
JPWO2011004474A1 (ja) | 2012-12-13 |
CN102473642B (zh) | 2014-11-12 |
CN102473642A (zh) | 2012-05-23 |
KR20120014220A (ko) | 2012-02-16 |
KR101354844B1 (ko) | 2014-01-22 |
JP5355692B2 (ja) | 2013-11-27 |
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