WO2014119596A1 - 半導体装置およびその製造方法 - Google Patents
半導体装置およびその製造方法 Download PDFInfo
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- WO2014119596A1 WO2014119596A1 PCT/JP2014/051903 JP2014051903W WO2014119596A1 WO 2014119596 A1 WO2014119596 A1 WO 2014119596A1 JP 2014051903 W JP2014051903 W JP 2014051903W WO 2014119596 A1 WO2014119596 A1 WO 2014119596A1
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- 238000004519 manufacturing process Methods 0.000 title claims description 26
- 238000000034 method Methods 0.000 title claims description 13
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- 239000010937 tungsten Substances 0.000 claims description 2
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- H01L29/4232—Gate electrodes for field effect devices for field-effect transistors with insulated gate
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- H01L29/66409—Unipolar field-effect transistors
- H01L29/66477—Unipolar field-effect transistors with an insulated gate, i.e. MISFET
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- H01L29/66477—Unipolar field-effect transistors with an insulated gate, i.e. MISFET
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Definitions
- the present invention relates to a semiconductor device and a manufacturing method thereof, and more particularly to a semiconductor device having a field effect transistor in which a gate insulating film containing a high dielectric constant insulating material is formed and a manufacturing method thereof.
- a transistor having a HKMG (High-K Metal Gate) structure includes a gate insulating film including a high dielectric constant insulating material having a dielectric constant higher than that of silicon oxide, and a metal film.
- a transistor including a gate electrode In the HKMG transistor, since the gate insulating film includes a high dielectric constant insulating material, the gate leakage current can be suppressed while reducing the EOT (equivalent oxide film thickness). Further, by using a gate electrode having a metal film, the operating characteristics of the transistor can be improved. On the other hand, in the HKMG transistor, it is known that the threshold voltage (V t ) shifts according to the oxygen diffusion state of the high dielectric constant gate insulating film used.
- JP-A-2009-283906 discloses, when oxygen is supplied to the high dielectric constant insulating film from the side after the patterning V t of the field effect transistor is disclosed a phenomenon varying.
- IEEE Transactions on ELECTRON DEVICES, VOL. 53, NO. 9, SEPTEMBER 2006; IEE Transactions on Electron Device, Vol. 53, No. 9, September 2006 discloses a structure in which the gate electrode of a field effect transistor is thinned near the gate insulating film.
- FIGS. 13B and 13C are diagrams showing in detail the problems of the related technology described above.
- 13A is a cross-sectional view
- FIGS. 13B and 13C are partial enlarged views of portions B and C surrounded by dotted lines in the cross-sectional view of FIG. 13A, respectively.
- FIG. 14A is a cross-sectional view
- FIGS. 14B and 14C are partial enlarged views of portions B and C surrounded by dotted lines in the cross-sectional view of FIG. 14A, respectively.
- 13 and 14 show only a part of the structure of the memory cell region and the peripheral circuit region.
- a gate electrode 502 and the like having the above are formed.
- liner films 551 and 552 that are silicon nitride films so as to cover the bit lines 501 liner films 551 that are silicon nitride films so as to cover the gate insulating film 510 and the gate electrode 502, and spacer films 560 that are TEOS films.
- a liner film 552 which is a silicon nitride film is formed.
- oxide D1 is formed.
- This oxide D1 has the same effect as increasing the thickness of the gate insulating film 510, and the advantageous characteristic of the HKMG transistor that the EOT can be thinned is deteriorated. As a result, problems such as an increase in V t of the HKMG transistor occur.
- the liner film 551 when the thickness of the liner film 551 is increased, it is possible to suppress the increase in V t of the HKMG transistor in the peripheral circuit region 3.
- the liner film 551 is simultaneously formed not only on the peripheral circuit region 3 but also on the memory cell region 2.
- the opening margin of a capacitor contact (not shown) formed between the bit lines 501 in the memory cell region 2 has been reduced.
- the thickness of the liner film 551 when the thickness of the liner film 551 is increased, the space between the bit lines 501 in the memory cell region 2 is completely filled with the liner film 551, making it difficult to form a capacitor contact.
- a method of forming a liner film 551 ' which is a composite film of a silicon nitride film and a silicon oxide film instead of the liner film 551 has been proposed.
- the space film 560 in the memory cell region 2 is removed, the silicon oxide film constituting the liner film 551 ′ on the side surface of the bit line 501 is also removed, and an opening margin of the capacitor contact in the memory cell region 2 can be secured.
- this method when the liner film 551 ′ is formed, a silicon oxide film forming process is added, and the manufacturing cost increases.
- the problems of the related art have been described by taking as an example a DRAM having HKMG transistors in the peripheral circuit region.
- the comprises a field effect transistor having a gate insulating film including a high dielectric constant insulating material, in the semiconductor device miniaturization has progressed, similarly to the above, the V t increase of the field effect transistor suppressed, It has been difficult to form a liner film having a thickness suitable for both the formation of other parts where the miniaturization of contacts and the like has progressed.
- a gate insulating film comprising a high dielectric constant insulating material, comprising two side surfaces opposite to each other on the top surface and the bottom surface, in contact with the substrate at the bottom surface, and having a first width defined by an interval between the two side surfaces;
- a lower gate electrode facing the substrate through a part of the gate insulating film and having a second width narrower than the first width along a direction parallel to the first width;
- An upper gate electrode that covers the lower gate electrode and has two sides opposite to each other, the upper gate electrode having a third width along a direction parallel to the first width;
- a first spacer layer covering the side of the membrane The present invention relates to a semiconductor device including a field effect transistor having the following.
- FIG. 1 A block diagram illustrating an exemplary embodiment of the present invention.
- FIG. 1 A block diagram illustrating an exemplary embodiment of the present invention.
- FIG. 1 A block diagram illustrating an exemplary embodiment of the present invention.
- FIG. 1 A block diagram illustrating an exemplary embodiment of the present invention.
- FIG. 1 A block diagram illustrating an exemplary embodiment of the present invention.
- FIG. 1 A block diagram illustrating an exemplary embodiment of the present invention.
- V t of the field effect transistor can be suppressed without increasing the manufacturing cost.
- a semiconductor device that can be miniaturized can be provided.
- the “lower gate electrode” described in the claims corresponds to the polysilicon films 511 and 512 constituting the gate electrode 502.
- the “upper gate electrode” described in the claims corresponds to the metal film 513 constituting the gate electrode 502.
- the “first spacer layer” and the “second spacer layer” described in the claims correspond to the liner film 551 and the space film 560, respectively.
- the “first impurity diffusion layer” and the “second impurity diffusion layer” recited in the claims correspond to the peripheral LDD region 103 and the peripheral source and drain regions 104, respectively.
- the “first width”, “second width”, and “third width” are the extensions of the gate insulating film 510, the lower gate electrodes (polysilicon films) 511 and 512, and the upper gate electrode (metal film) 513, respectively. It represents the width in the direction perpendicular to the current direction and parallel to the substrate (the distance between the two side surfaces facing each other). For example, when the gate insulating film, the lower gate electrode, and the upper gate electrode are rectangular in plan view, the “first width”, the “second width”, and the “third width” are the gate insulating film and the lower gate, respectively. It represents the width of the electrode and the upper gate electrode in the short side direction.
- the “single layer thickness of the first spacer layer” represents the thickness of the first spacer layer when the single layer of the first spacer layer is formed on a plane (excluding the step).
- the semiconductor device includes a planar field effect transistor.
- the gate insulating film of the field effect transistor includes a high dielectric constant insulating material, has two side surfaces facing each other on the top surface and the bottom surface, and has a first width defined by an interval between the two side surfaces.
- the gate electrode of the field effect transistor includes a lower gate electrode facing the substrate through a gate insulating film, and an upper gate electrode covering the lower gate electrode.
- the lower gate electrode has a second width that is narrower than the first width along a direction parallel to the first width.
- a first spacer layer is provided so as to cover a part of the lower gate electrode and a part of the upper surface of the gate insulating film that is not in contact with the lower gate electrode and the side surface.
- the third width of the upper gate electrode along the direction parallel to the first width is (the sum of the first width and the film thickness twice the single-layer film thickness of the first spacer layer). It is better to be larger than (film thickness). That is, it is preferable to satisfy the following formula (1). (Third width)> first width + (single layer thickness of first spacer layer) ⁇ 2 (1)
- the single layer thickness of the first spacer layer is preferably 1.4 times or more the thickness of the gate insulating film.
- the film thickness of the first spacer layer formed on the step composed of the lower gate electrode and the gate insulating film can be made larger than the single layer film thickness of the first spacer layer.
- the first spacer layer on the step (the upper surface and the side surface of the gate insulating film) is thicker than the gate insulating film. Therefore, in the manufacturing process of the field effect transistor, it is possible to prevent the oxidizing agent from entering from the end portion of the gate insulating film and oxidizing the periphery of the end portion of the gate insulating film to generate oxide.
- the silicon oxide film forming step as in the case of using the liner film 551 ′ made of the silicon nitride film and the silicon oxide film in FIG. 14 is not required, the manufacturing cost can be reduced.
- the first spacer layer is uniformly thick on the step in a self-aligning manner. Therefore, it is not necessary to increase the thickness of the first spacer layer, and even when the semiconductor device is miniaturized, adverse effects on the formation of other parts of the semiconductor device can be prevented. As a result, a semiconductor device corresponding to miniaturization can be provided.
- the semiconductor device of the second embodiment relates to a DRAM (Dynamic Random Access Memory), in which an HKMG transistor is formed in a peripheral circuit region, and a bit line and a memory cell are formed in a memory cell region.
- the gate insulating film includes a high dielectric constant insulating material and the gate electrode has a metal film, but the basic configuration is the same as that of the field effect transistor of the first embodiment.
- the first spacer layer is formed on the step including the lower gate electrode and the gate insulating film.
- the bit line is formed of the same material as a part of the gate electrode of the HKMG transistor, and the first spacer layer is also provided on the side surfaces of the bit line facing each other.
- the film thickness of the first spacer layer on the step composed of the lower gate electrode and the gate insulating film in the peripheral circuit region is larger than the film thickness of the first spacer layer on the side surface of the bit line.
- the second width of the lower gate electrode in the peripheral circuit region is narrower than the third width along the direction parallel to the first width of the upper gate electrode.
- FIGS. 1A to 1C each show a cross section of the gate electrode 502 of the HKMG transistor disposed in the peripheral circuit region as viewed in the opposing direction of the two side surfaces of the gate electrode (hereinafter referred to as “direction 10”). is there.
- FIG. 1A shows a case where the width (first width) W 1 in the direction 10 of the gate insulating film 510 is narrower than the width (third width) W 3 in the direction 10 of the upper gate electrode (metal film 513).
- 1B shows a case where the third width W 3 is the same as the first width W 1
- FIG. 1C shows a case where the first width W 1 is wider than the third width W 3 .
- the gate electrode 502 includes polysilicon films 511 and 512 and a metal film 513.
- the polysilicon films 511 and 512 correspond to a lower gate electrode and the metal film 513 corresponds to an upper gate electrode.
- the liner film 551 corresponds to the first spacer layer.
- the gate insulating film 510 has a top surface 510a, a bottom surface 510b, and two side surfaces 510c facing each other, and is in contact with the semiconductor substrate 100 at the bottom surface 510b.
- the polysilicon films 511 and 512 are opposed to the semiconductor substrate 100 with the gate insulating film 510 interposed therebetween.
- the metal film 513 covers the polysilicon films 511 and 512, and has an upper part 513a, a lower part 513b, and two side parts 513c facing each other.
- the liner film 551 is a gate not in contact with the side portion 513 c of the metal film 513, a part of the bottom part 513 b of the metal film 513, a part of the polysilicon films 511 and 512, and the polysilicon film 511.
- the insulating film 510 is provided so as to cover a part of the upper surface 510 a of the insulating film 510 and the side surface 510 c of the gate insulating film 510.
- a gate insulating film 510 is formed in the peripheral circuit region.
- polysilicon films 511 and 512, a metal film 513, and a mask insulating film 514 are sequentially formed in the memory cell region and the peripheral circuit region.
- the mask insulating film 514 is sequentially processed into the shape of the bit line and the gate electrode 502 by etching using the hard mask.
- the gate insulating film 510 is also processed by this etching.
- etching is performed using conditions (highly isotropic etching conditions) for etching not only in the vertical direction but also in the horizontal direction of the polysilicon films 511 and 512.
- the hard mask pattern is set so that the interval between the gate electrodes 502 in the peripheral circuit region is wider than the interval between the bit lines in the memory cell region. Due to the difference in density between the bit line and the gate electrode 502, the polysilicon film 512 and the bit line plug (both not shown) constituting the bit line are not etched in the horizontal direction.
- the polysilicon films 511 and 512 constituting the gate electrode 502 in the peripheral circuit region are etched in the horizontal direction and the width thereof becomes narrow. As a result, the second width of the polysilicon films 511 and 512 is narrower than the third width of the metal film 513. Further, a step 11 made of the gate insulating film 510 and the polysilicon films 511 and 512 is formed.
- the liner film 551 on the peripheral circuit region is etched back.
- the width of the metal film 513 and the width of the polysilicon film 512 are substantially the same. Therefore, the thickness of the liner film formed on the side surface of the bit line is substantially the same as that of the single layer film of the liner film 551.
- the step 11 composed of the gate insulating film 510 and the polysilicon films 511 and 512 is formed, the L-shaped liner film 511 remains on the step 11 after the etch back. Become.
- the liner film 511 includes the side portions 513c of the metal film 513, a part of the lower part 513b of the metal film 513, a part of the polysilicon films 511 and 512, and the gate insulating film 510 that is not in contact with the polysilicon film 511. It is provided so as to cover a part of the upper surface 510 a and the side surface 510 c of the gate insulating film 510.
- the film thickness of the liner film 511 on the step 11 can be made larger than the film thickness (single layer film thickness) of the liner film formed on the side surface of the bit line. Accordingly, it is possible to prevent an oxidant from entering from the end portion of the gate insulating film 510 and oxidizing the periphery of the end portion of the gate insulating film 510 to generate oxide. As a result, it is possible to prevent the V t of KHMG transistor rises. Further, since the silicon oxide film forming step as in the case of using the liner film 551 ′ made of the silicon nitride film and the silicon oxide film in FIG. 14 is not required, the manufacturing cost can be reduced.
- the liner film 551 is uniformly thick on the step 11 in a self-aligning manner. Therefore, it is not necessary to increase the thickness of the single layer of the liner film 551, and even when the semiconductor device is miniaturized, adverse effects on the formation of other parts of the semiconductor device can be prevented. As a result, a semiconductor device corresponding to miniaturization can be provided.
- the liner film 551 is thinned or removed on the step 11. possible. In this case, it becomes difficult to prevent the oxidant from entering.
- the first width of the gate insulating film 510 be the same as or smaller than the third width of the metal film 513 by adjusting the etching conditions.
- FIG. 2A is a plan view showing the arrangement of main parts of the DRAM 1 which is the semiconductor device of the present embodiment
- FIG. 2B is a cross-sectional view in the AA direction of FIG.
- components such as the bit line 501 in the memory cell region 2 and the gate electrode 502 in the peripheral circuit region 3 are drawn so as to be transparent so that the lower structure can be seen.
- FIG. 2A shows only the main structure.
- a memory cell region 2 and a peripheral circuit region 3 are arranged adjacent to the memory cell region 2 on the semiconductor substrate 100.
- a parallelogrammized memory cell active region 101 obtained by dividing the semiconductor substrate 100 in the X ′ direction and the Y direction inclined from the X direction by the element isolation region 200. Is placed. That is, the memory cell active region 101 is repeatedly arranged with the element isolation region 200 interposed therebetween in the X ′ direction and the Y direction.
- the plurality of memory cell active regions 101 aligned in the Y direction and the element isolation region 200 between the memory cell active regions 101 are extended in the Y direction to divide each memory cell active region 101 into three equal parts.
- two gate insulating films (not shown) and two embedded word lines 300 are arranged.
- the material of the gate insulating film is not particularly limited, but a silicon oxide film or the like can be used.
- the material of the buried word line 300 is not particularly limited, but a metal film, a laminated film of a barrier metal film and a metal film, or the like can be used.
- the upper surface of the buried word line 300 is lower than the main surface of the semiconductor substrate 100, and a cover insulating film (not shown) is disposed on the upper surface of the buried word line 300.
- a bit-con interlayer insulating film 610 is provided on the semiconductor substrate 100 in the memory cell region 2.
- the portion between the two embedded word lines 300 (center portion) extends in the X direction so as to be connected in the X direction.
- the bit line 501 is disposed through the first interlayer insulating film 600. That is, the bit lines 501 are repeatedly arranged at a specific interval in the memory cell region 2.
- the bit line 501 is composed of a polysilicon film 512 and a metal film 513 and is connected to the central portion of the memory cell active region 101 by a bit line plug 505 made of a polysilicon film.
- a mask insulating film 514 that is a silicon nitride film is provided on the upper surface of the bit line 501.
- a liner film 551 which is a silicon nitride film and a liner film 552 which is also a silicon nitride film are provided on the side surface of the bit line 501.
- both sides of the memory cell active region 101 divided into three equal parts by the two embedded word lines 300 are connected to the capacitor 800 via a capacitor contact (not shown).
- a rectangular peripheral circuit active region 102 obtained by dividing the semiconductor substrate 100 in the X direction and the Y direction is arranged by the element isolation region 200. That is, the peripheral circuit active region 102 is repeatedly arranged with the element isolation region 200 interposed therebetween in the X direction and the Y direction.
- the shape and arrangement of the peripheral circuit active region 102 may be different from that shown in FIG.
- the peripheral circuit active region 102 aligned in the Y direction and the element isolation region 200 between the peripheral circuit active regions 102 extend in the X direction, and the peripheral circuit is interposed via the gate insulating film 510.
- a gate electrode 502 is arranged to divide the active region 102 into two equal parts.
- the gate electrode 502 has the same structure as that in FIG.
- the second width of the lower gate electrode in the direction of the two side surfaces of the upper and lower gate electrodes is the first width of the gate insulating film 510 in the Y direction and the second width of the upper gate electrode in the Y direction. It is narrower than the width of 3. Therefore, a step is formed from the gate insulating film 510 and the lower gate electrode.
- the first width of the gate insulating film 510 is the same as the third width of the upper gate electrode.
- a liner film (first spacer layer) 551 that is a silicon nitride film, and a space film (second spacer layer) 560 that is a TEOS (Tetra Ethyl Ortho Silicate) film A liner film 552 that is a silicon nitride film is disposed.
- the space film 560 is disposed so as to cover the liner film 551 and cover the peripheral LDD region 103 in the vicinity of the liner film 551.
- a mask insulating film 514 that is a silicon nitride film is provided on the metal film 513 of the gate electrode 502.
- the width of the mask insulating film 514 in the Y direction is the same as the width of the metal film 513 in the Y direction.
- a peripheral LDD (Lightly Doped Drain) region (first impurity diffusion layer) 103 is formed in the peripheral circuit active region 102 by implanting impurities into the peripheral circuit active region 102 using the mask insulating film 514 and the liner film 551 as a mask. Is arranged.
- the peripheral LDD regions 103 are arranged on both sides of the gate insulating film 510 in the semiconductor substrate 100 along the liner film 551 in plan view. Further, by implanting impurities into the peripheral circuit active region 102 using the mask insulating film 514, the liner film 551, and the space film 560 as masks, a peripheral source and drain (source drain) region (first drain) is formed in the peripheral circuit active region 102. 2 impurity diffusion layers) 104 are disposed.
- the peripheral source and drain regions 104 are arranged on both sides of the gate insulating film 510 in the semiconductor substrate 100 along the space film 560 in plan view.
- a field effect transistor is configured by a gate insulating film 510, a gate electrode 502, a mask insulating film 514, a peripheral LDD region 103, a peripheral source and drain region 104, liner films 551 and 552, and a space film 560. Is done.
- the bit line 501, liner film 551 and liner film 552 in the memory cell region 2, and the gate electrode 502, liner film 551, space film 560 and liner film 552 in the peripheral circuit region 3 are embedded.
- the first interlayer insulating film 600 is disposed on the entire surface of the semiconductor substrate 100.
- the memory cell active region 101 is divided into three equal parts by the two embedded word lines 300 of FIG. 2A through the first interlayer insulating film 600 and the bit-con interlayer insulating film 610. Capacitance contacts (not shown) connected to the two outer portions of the two buried word lines 300 are arranged.
- a peripheral contact 750 is disposed so as to penetrate the first interlayer insulating film 600 and be connected to the peripheral source and drain region 104.
- the peripheral contact 750 is connected to a peripheral wiring 760 provided on the first interlayer insulating film 600.
- a stopper film 780 that is a silicon nitride film and a thick (for example, 1 ⁇ m) second interlayer insulating film 790 are disposed so as to cover the upper surfaces of the capacitor contact, the first interlayer insulating film 600 and the peripheral wiring 760 that are not shown. Is done.
- a capacitor 800 including a lower electrode, a capacitor insulating film, and an upper electrode connected to the upper surface of the capacitor contact is disposed through the second interlayer insulating film 790 and the stopper film 780.
- the capacitor 800 is a cylinder type in which a capacitive insulating film and an upper electrode are formed in order on the inner wall side surface and the inner wall bottom surface of the lower electrode.
- the structure of the capacitor 800 is not particularly limited as long as it can store charges.
- the capacitor 800 may be a crown type capacitor in which a capacitor insulating film and an upper electrode are formed in this order on the inner wall side surface, the outer wall side surface, and the inner wall bottom surface of the lower electrode.
- the upper electrode of the capacitor 800 is connected to the plate electrode 810.
- the third interlayer insulating film 900 is disposed on the second interlayer insulating film 790.
- a wiring contact 910 is provided so as to penetrate the stopper film 780, the second interlayer insulating film 790 and the third interlayer insulating film 900 and be connected to the peripheral wiring 760.
- a wiring 920 is provided on the third interlayer insulating film 900 so as to be connected to the wiring contact 910.
- a protective insulating film 930 is disposed on the third interlayer insulating film 900 so as to cover the wiring 920.
- the semiconductor device of this embodiment has a step formed from the gate insulating film 510 in the peripheral circuit region 3 and the polysilicon films 511 and 512. Since the liner film (first spacer layer) 551 is provided on this step, the film thickness can be increased in a self-aligned manner compared to the liner film 551 formed on the side surface of the bit line 501. . Therefore, in the manufacturing process of the semiconductor device of this embodiment, it is possible to prevent the oxidant from entering from the end of the gate insulating film 510 to generate oxide in the gate insulating film 510. As a result, it is possible to effectively prevent an increase in V t of the field effect transistor disposed in the peripheral circuit region 3.
- the silicon oxide film forming step as in the case of using the liner film 551 ′ made of the silicon nitride film and the silicon oxide film in FIG. 14 is not required, the manufacturing cost can be reduced. Further, since the liner film 551 is uniformly thick on the steps in a self-aligned manner, it is not necessary to increase the thickness of the single layer of the liner film 551, and even when the semiconductor device is miniaturized, other parts of the semiconductor device The adverse effect on the formation of can be prevented. As a result, a semiconductor device corresponding to miniaturization can be provided.
- A is a plan view
- B is a cross-sectional view in the AA direction of A
- C is a partial enlarged view of a portion C surrounded by a dotted line in FIG.
- Part A is shown as a perspective view showing only part of the structure.
- an element isolation region 200 is formed in a semiconductor substrate 100 using a known technique, and the surface of the semiconductor substrate 100 is formed with a plurality of memory cell active regions 101 and a plurality of peripheral circuits. Divide into active regions 102. Impurity diffusion layers (not shown) are formed on the surface of the memory cell active region 101 by ion-implanting impurities of the opposite conductivity type into each memory cell active region 101. A trench for a buried word line is formed in the memory cell region 2 so that each memory cell active region 101 is equally divided into three. Thereby, the impurity diffusion layer on the surface of the memory cell active region 101 is also divided into three equal parts.
- a gate insulating film (not shown) is formed on the inner wall surface of the trench.
- a conductive film and an insulating film are formed so as to fill the trench.
- a buried word line 300 that is a conductive film and a cover insulating film (not shown) are formed on the buried word line 300.
- a cell transistor including a pair of impurity diffusion layers formed on the surface of the gate insulating film, the buried word line 300, and the memory cell active region 101 is completed in the memory cell region 2.
- the central impurity diffusion layer is formed of two cell transistors. Shared between.
- a bit-con interlayer insulating film 610 is formed in a predetermined region of the memory cell region 2.
- a gate insulating film 510 containing a high dielectric constant insulating material is formed on the surface of the peripheral circuit active region 102 in the peripheral circuit region 3.
- a polysilicon film 511 is formed on the peripheral circuit active region 102 in the peripheral circuit region 3.
- An opening 620 is formed in the bit-con interlayer insulating film 610 so that the central portion of the memory cell active region 101 divided into three equal parts by the two buried word lines 300 is exposed.
- a polysilicon film 512, a metal film 513, and a silicon nitride film 514 are sequentially formed on the semiconductor substrate 100 in the memory cell region 2 and the peripheral circuit region 3.
- the silicon nitride film 514 is patterned to form a mask insulating film pattern.
- the pattern of the mask insulating film 514 is set such that the interval between the gate electrodes 502 in the peripheral circuit region 3 (interval in the Y direction) is larger than the interval between the bit lines 501 in the memory cell region 2 (interval in the Y direction).
- the metal film 513, the polysilicon films 512, 511, and the gate insulating film 510 are sequentially etched using the pattern of the mask insulating film 514 as a mask.
- this etching when the polysilicon films 511 and 512 are etched, conditions are set such that etching proceeds not only in the vertical direction but also in the horizontal direction of the polysilicon films 511 and 512 (highly isotropic etching conditions).
- the interval between the patterns for the bit line 501 is narrower than the interval between the patterns for the gate electrode 502.
- the polysilicon film 512 and the bit line plug (not shown) constituting the bit line 501 are not etched in the horizontal direction due to the difference in pattern density between the bit line 501 and the gate electrode 502.
- the polysilicon films 511 and 512 constituting the gate electrode 502 in the peripheral circuit region 3 are etched in the horizontal direction and the width thereof becomes narrow.
- the second width in the Y direction of the polysilicon films (lower gate electrodes) 511 and 512 is the same as the first width in the Y direction of the gate insulating film 510 and the second width in the Y direction of the metal film (upper gate electrode) 513. It becomes narrower than the width of 3. Accordingly, a step 11 comprising the gate insulating film 510 and the lower gate electrodes 511 and 512 is formed. Further, a bit line 501 composed of a polysilicon film 512 and a metal film 513 is formed in the memory cell region 2, and a gate electrode 502 composed of the polysilicon films 511, 512 and the metal film 513 is formed in the peripheral circuit region 3. .
- a liner film which is a silicon nitride film, is used to cover the bit line 501 and the gate electrode 502 over the entire surface of the semiconductor substrate 100 in the memory cell region 2 and the peripheral circuit region 3 by using the CVD method. 551 is formed.
- a photoresist film 91a is formed on the semiconductor substrate 100 so as to cover the memory cell region 2 by a known lithography method.
- the liner film 551 is left in contact with the side surface of the gate electrode 502 by etching back the liner film 551 using the photoresist film 91a as a mask.
- the step 11 composed of the gate insulating film 510 and the lower gate electrodes 511 and 512 is formed on the semiconductor substrate 100 in the peripheral circuit region 3.
- the liner film 551 remains. Therefore, the liner film 551 on the step 11 can be made thicker than the liner film 551 on the side surface of the bit line 501 in the memory cell region 2.
- the film thickness of the liner film 551 on the end portion (exposed upper surface and side surface; upper surface and side surface not in contact with the polysilicon film 511) of the gate insulating film 510 can be increased in a self-aligning manner.
- the oxidant does not enter the gate insulating film 510 and the periphery of the end portion of the gate insulating film 510 is not oxidized, and an increase in V t of the field effect transistor in the peripheral circuit region 3 can be suppressed. .
- the peripheral LDD region 103 is formed.
- the space film 560 for example, the TEOS-BPSG film, the upper surface of the bit line 501 and the gate electrode 502, and the liner film 551 are formed by CVD.
- a film is formed on the entire surface of the semiconductor substrate 100 including the side surface covered with the film.
- the space film 560 is almost buried.
- the space film 560 is removed by etch back.
- the conditions are set so that the bit line 501 in the memory cell region 2 and the space film 560 in a portion in contact with the side surface covered with the liner film 551 of the gate electrode 502 are left. That is, since the space between the bit lines 501 is narrow in the memory cell region 2, adjacent space films 560 are in contact with each other, and the space between the bit lines 501 is filled with the liner film 551 and the space film 560.
- the memory cell region 2 is protected by a photoresist film 91b, and the peripheral circuit active region 102 is used as a peripheral circuit by using the mask insulating film 514, the liner film 551, and the space film 560 as a mask. Impurities having characteristics opposite to those of the active region 102 are ion-implanted more than the peripheral LDD region 103 to form the peripheral source and drain regions 104.
- the etch-back condition is set to a condition in which a portion of the liner film 551 in contact with the side surface of the bit line 501 remains.
- a liner film 552 which is a silicon nitride film, is formed on the entire surface of the semiconductor substrate 100 in the memory cell region 2 and the peripheral circuit region 3 by using the CVD method. Is deposited.
- a first interlayer insulating film 600 for example, a silicon oxide film is formed on the entire surface of the semiconductor substrate 100 in the memory cell region 2 and the peripheral circuit region 3 by using the CVD method or SOD coating. To do. At this time, when using SOD coating, the silicon oxide film is obtained by modifying SOD by heat treatment.
- the first interlayer insulating film 600 is polished flat by CMP.
- the CMP method is performed until the bit line 501 and the liner film 552 on the gate electrode 502 are exposed.
- the liner film 552 and the first interlayer insulating film 600 are further removed by CMP or etch back until the mask insulating film 514 is exposed.
- a peripheral wiring 760 connected to the peripheral contact 750 in the peripheral circuit region 3, a stopper film 780, and a second interlayer insulating film 790 are formed by a known technique.
- a capacitor 800 connected to a capacitor contact (not shown) is formed through the stopper film 780 and the second interlayer insulating film 790 by a known technique.
- a plate electrode 810 is formed on the second interlayer insulating film 790 so as to be connected to the upper electrode of the capacitor 800.
- the third interlayer insulating film 900 is formed so as to cover the second interlayer insulating film 790, the stopper film 780, the second interlayer insulating film 790, and the third interlayer insulating film 900 are penetrated and connected to the peripheral wiring 760.
- a wiring contact 910 is formed as described above.
- a wiring 920 is formed on the third interlayer insulating film 900 so as to be connected to the wiring contact 910, and then a protective insulating film 930 is formed so as to cover the third interlayer insulating film 900. Thereby, the semiconductor device 1 of this embodiment is completed.
- the material of the metal film 513 constituting the upper gate electrode is not particularly limited as long as it functions as the gate electrode.
- the metal film 513 for example, at least one film selected from the group consisting of a titanium silicide film, a tungsten silicide film, a titanium nitride film, and a tungsten film can be used.
- the high dielectric constant insulating material included in the gate insulating film 510 is not particularly limited as long as it has a dielectric constant higher than that of silicon oxide.
- At least one insulating material selected from the group consisting of Ho 2 O 3 , Er 2 O 3 , Tm 2 O 3 , Yb 2 O 3 , and Lu 2 O 3 can be used.
- Steps 91a, 91b, 91c. Photoresist film 100 Semiconductor substrate 101. Memory cell active region 102. Peripheral circuit active region 103. Peripheral LDD (lightly doped drain) region 104. Peripheral source and drain regions 200. Element isolation region 300. Embedded word line 501. Bit line 502. Gate electrode 505. Bit line plug 510. Gate insulating film 511. Polysilicon film 512. Polysilicon film 513. Metal film 514. Mask insulating film 550. Liner layer 551. Liner film 551 ′. Liner film 552. Liner film 560. Space film 600. First interlayer insulating film 610.
- Bit-con interlayer insulating film 620 Opening 750. Peripheral contact 760. Peripheral wiring 780. Stopper film 790. Second interlayer insulating film 800. Capacitor 810. Plate electrode 900. Third interlayer insulating film 910. Wiring contact 920. Wiring 930. Protective insulating film D1. Oxide
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Abstract
Description
高誘電率絶縁材料を含み、上面と底面と互いに対向する2つの側面を備え、前記底面で基板と接し、前記2つの側面の間隔で定義される第1の幅を有するゲート絶縁膜と、
前記ゲート絶縁膜の一部を介して前記基板と対向し、前記第1の幅と平行方向に沿って前記第1の幅より狭い第2の幅を有する下部ゲート電極と、
前記下部ゲート電極を覆い、上部と下部と互いに対向する2つの側部を備え、前記第1の幅と平行方向に沿って第3の幅を有する上部ゲート電極と、
前記上部ゲート電極の側部と、前記上部ゲート電極の下部の一部と、前記下部ゲート電極の一部と、前記下部ゲート電極と接しない前記ゲート絶縁膜の上面の一部と、前記ゲート絶縁膜の側面を覆う第1のスペーサ層と、
を有する電界効果トランジスタを備える半導体装置に関する。
基板上に、高誘電率絶縁材料を含むゲート絶縁膜を形成する工程と、
前記ゲート絶縁膜上に下部ゲート電極を形成する工程と、
前記下部ゲート電極上に上部ゲート電極を形成する工程と、
前記上部ゲート電極及び前記下部ゲート電極をパターニングする工程と、
前記下部ゲート電極をサイドエッチングして、前記下部ゲート電極の互いに対向する2つの側面の間隔で定義される第2の幅を細くする工程と、
前記ゲート絶縁膜における前記第2の幅と平行方向に沿った第1の幅が前記第2の幅よりも広くなるように、前記ゲート絶縁膜を選択的に除去する工程と、
前記上部ゲート電極の側部および下部と、前記下部ゲート電極の側面と、前記ゲート絶縁膜の上面および側面の露出部分を覆うように、第1のスペーサ層を形成する工程と、
を備える半導体装置の製造方法に関する。
特許請求の範囲に記載の「上部ゲート電極」はゲート電極502を構成する金属膜513に相当する。
特許請求の範囲に記載の「第1のスペーサ層」および「第2のスペーサ層」はそれぞれ、ライナー膜551およびスペース膜560に相当する。
特許請求の範囲に記載の「第1の不純物拡散層」および「第2の不純物拡散層」はそれぞれ、周辺LDD領域103および周辺ソースおよびドレイン領域104に相当する。
第1実施形態の半導体装置は、プレナー型の電界効果トランジスタを備える。電界効果トランジスタのゲート絶縁膜は、高誘電率絶縁材料を含み、上面と底面と互いに対向する2つの側面を備え、2つの側面の間隔で定義される第1の幅を有する。電界効果トランジスタのゲート電極は、ゲート絶縁膜を介して基板と対向する下部ゲート電極と、下部ゲート電極を覆う上部ゲート電極を備える。下部ゲート電極は、第1の幅と平行方向に沿って第1の幅より狭い第2の幅を有する。また、下部ゲート電極の一部、ならびにゲート絶縁膜の下部ゲート電極と接しない上面の一部および側面を覆うように第1のスペーサ層が設けられている。好ましくは、第1の幅と平行方向に沿った上部ゲート電極の第3の幅は、(第1の幅と、第1のスペーサ層の単層膜厚の2倍の膜厚と、の合計膜厚)よりも大きいのが良い。すなわち、下記式(1)を満たすことが好ましい。
(第3の幅) > 第1の幅+(第1のスペーサ層の単層膜厚)×2 (1)
また、第1のスペーサ層の単層膜厚は、ゲート絶縁膜の膜厚の1.4倍以上であることが好ましい。
第2実施形態の半導体装置はDRAM(Dynamic Random Access Memory)に関するものであり、周辺回路領域にHKMGトランジスタが形成され、メモリセル領域にビット線やメモリセルが形成されている。HKMGトランジスタは、ゲート絶縁膜が高誘電率絶縁材料を含み、ゲート電極が金属膜を有するが、その基本的構成は上記第1実施形態の電界効果トランジスタと同様である。このため、本実施形態の半導体装置では、下部ゲート電極およびゲート絶縁膜からなる段差上に第1のスペーサ層が形成されている。また、ビット線は、HKMGトランジスタのゲート電極の一部と同じ材料から形成されており、ビット線の互いに対向する側面上にも第1のスペーサ層が設けられている。
(1)周辺回路領域の下部ゲート電極およびゲート絶縁膜からなる段差上の第1のスペーサ層の膜厚が、ビット線の側面上の第1のスペーサ層の膜厚よりも厚くなっている。
(2)周辺回路領域の下部ゲート電極の第2の幅は、上部ゲート電極の第1の幅と平行方向に沿った第3の幅よりも狭くなっている。
以下では、図2を参照して、本実施形態の半導体装置について説明する。図2Aは本実施形態の半導体装置であるDRAM1の主要部分の配置を示す平面図、図2Bは図2AのA-A方向の断面図である。図2Aにおいて、メモリセル領域2のビット線501および周辺回路領域3のゲート電極502等の構成要素は、透明にして下の構造が分かるように描いている。また、図2Aでは、主要な構造しか示していない。
2.メモリセル領域
3.周辺回路領域
11.段差
91a、91b、91c.フォトレジスト膜
100.半導体基板
101.メモリセル活性領域
102.周辺回路活性領域
103.周辺LDD(lightly doped drain)領域
104.周辺ソースおよびドレイン領域
200.素子分離領域
300.埋め込みワード線
501.ビット線
502.ゲート電極
505.ビット線プラグ
510.ゲート絶縁膜
511.ポリシリコン膜
512.ポリシリコン膜
513.金属膜
514.マスク絶縁膜
550.ライナー層
551.ライナー膜
551’.ライナー膜
552.ライナー膜
560.スペース膜
600.第一層間絶縁膜
610.ビットコン層間絶縁膜
620.開口
750.周辺コンタクト
760.周辺配線
780.ストッパー膜
790.第二層間絶縁膜
800.キャパシタ
810.プレート電極
900.第三層間絶縁膜
910.配線コンタクト
920.配線
930.保護絶縁膜
D1.酸化物
Claims (11)
- 高誘電率絶縁材料を含み、上面と底面と互いに対向する2つの側面を備え、前記底面で基板と接し、前記2つの側面の間隔で定義される第1の幅を有するゲート絶縁膜と、
前記ゲート絶縁膜の一部を介して前記基板と対向し、前記第1の幅と平行方向に沿って前記第1の幅より狭い第2の幅を有する下部ゲート電極と、
前記下部ゲート電極を覆い、上部と下部と互いに対向する2つの側部を備え、前記第1の幅と平行方向に沿って第3の幅を有する上部ゲート電極と、
前記上部ゲート電極の側部と、前記上部ゲート電極の下部の一部と、前記下部ゲート電極の一部と、前記下部ゲート電極と接しない前記ゲート絶縁膜の上面の一部と、前記ゲート絶縁膜の側面を覆う第1のスペーサ層と、
を有する電界効果トランジスタを備える半導体装置。 - 前記第3の幅は第1の幅と同じ幅か、または第1の幅よりも広い、請求項1に記載の半導体装置。
- 前記ゲート絶縁膜の上面および側面を覆う前記第1のスペーサ層の膜厚は、前記ゲート絶縁膜の膜厚よりも厚い、請求項1または2に記載の半導体装置。
- 前記上部ゲート電極上に前記上部と接し、前記第3の幅を有するマスク絶縁膜を更に備える、請求項1~3の何れか1項に記載の半導体装置。
- 平面視で、前記第1のスペーサ層に沿って前記基板内の前記ゲート絶縁膜を挟んだ両側に形成された第1の不純物拡散層を備える、請求項1~4の何れか1項に記載の半導体装置。
- 前記第1のスペーサ層の側面を覆い、前記第1のスペーサ層近傍の前記第1の不純物拡散層を覆う第2のスペーサ層と、
平面視で、前記第2のスペーサ層に沿って前記基板内の前記ゲート絶縁膜を挟んだ両側に形成された第2の不純物拡散層と、
を備える、請求項5に記載の半導体装置。 - 1対の不純物拡散層を有するセルトランジスタと、
前記セルトランジスタの一方の不純物拡散層に接続されたキャパシタと、
前記セルトランジスタの他方の不純物拡散層に接続されたビット線と、
を更に備える、請求項1~6の何れか1項に記載の半導体装置。 - 前記下部ゲート電極は、ポリシリコン膜を備える請求項1~7の何れか1項に記載の半導体装置。
- 前記上部ゲート電極は、金属膜を備える請求項1~8の何れか1項に記載の半導体装置。
- 前記金属膜は、チタンシリサイド膜、タングステンシリサイド膜、窒化チタン膜、およびタングステン膜からなる群から選択された少なくとも一種の膜からなる、請求項9に記載の半導体装置。
- 基板上に、高誘電率絶縁材料を含むゲート絶縁膜を形成する工程と、
前記ゲート絶縁膜上に下部ゲート電極を形成する工程と、
前記下部ゲート電極上に上部ゲート電極を形成する工程と、
前記上部ゲート電極及び前記下部ゲート電極をパターニングする工程と、
前記下部ゲート電極をサイドエッチングして、前記下部ゲート電極の互いに対向する2つの側面の間隔で定義される第2の幅を細くする工程と、
前記ゲート絶縁膜における前記第2の幅と平行方向に沿った第1の幅が前記第2の幅よりも広くなるように、前記ゲート絶縁膜を選択的に除去する工程と、
前記上部ゲート電極の側部および下部と、前記下部ゲート電極の側面と、前記ゲート絶縁膜の上面および側面の露出部分を覆うように、第1のスペーサ層を形成する工程と、
を備える半導体装置の製造方法。
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KR102525163B1 (ko) | 2018-05-15 | 2023-04-24 | 삼성전자주식회사 | 집적회로 소자 |
US11569251B2 (en) * | 2019-08-08 | 2023-01-31 | Taiwan Semiconductor Manufacturing Company, Ltd. | High voltage polysilicon gate in high-K metal gate device |
US11502163B2 (en) * | 2019-10-23 | 2022-11-15 | Nanya Technology Corporation | Semiconductor structure and fabrication method thereof |
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- 2014-01-29 US US14/764,970 patent/US20150372137A1/en not_active Abandoned
- 2014-01-29 KR KR1020157021511A patent/KR20150113009A/ko not_active Application Discontinuation
- 2014-01-29 DE DE112014000641.6T patent/DE112014000641T5/de not_active Ceased
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