WO2014157883A1 - 고종횡비 비아에 씨드 레이어를 형성시키는 방법 및 그 방법으로 형성된 고종횡비 비아를 갖는 반도체 소자 - Google Patents
고종횡비 비아에 씨드 레이어를 형성시키는 방법 및 그 방법으로 형성된 고종횡비 비아를 갖는 반도체 소자 Download PDFInfo
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- H10W20/01—Manufacture or treatment
- H10W20/031—Manufacture or treatment of conductive parts of the interconnections
- H10W20/032—Manufacture or treatment of conductive parts of the interconnections of conductive barrier, adhesion or liner layers
- H10W20/033—Manufacture or treatment of conductive parts of the interconnections of conductive barrier, adhesion or liner layers in openings in dielectrics
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- H10P14/40—Formation of materials, e.g. in the shape of layers or pillars of conductive or resistive materials
- H10P14/42—Formation of materials, e.g. in the shape of layers or pillars of conductive or resistive materials using a gas or vapour
- H10P14/44—Physical vapour deposition [PVD]
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- H10W20/023—Manufacture or treatment of interconnections within wafers or substrates the interconnections being through-semiconductor vias
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- H10W20/021—Manufacture or treatment of interconnections within wafers or substrates
- H10W20/023—Manufacture or treatment of interconnections within wafers or substrates the interconnections being through-semiconductor vias
- H10W20/0245—Manufacture or treatment of interconnections within wafers or substrates the interconnections being through-semiconductor vias comprising use of blind vias during the manufacture
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- H10W20/021—Manufacture or treatment of interconnections within wafers or substrates
- H10W20/023—Manufacture or treatment of interconnections within wafers or substrates the interconnections being through-semiconductor vias
- H10W20/0261—Manufacture or treatment of interconnections within wafers or substrates the interconnections being through-semiconductor vias characterised by the filling method or the material of the conductive fill
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- H10W20/031—Manufacture or treatment of conductive parts of the interconnections
- H10W20/032—Manufacture or treatment of conductive parts of the interconnections of conductive barrier, adhesion or liner layers
- H10W20/042—Manufacture or treatment of conductive parts of the interconnections of conductive barrier, adhesion or liner layers the barrier, adhesion or liner layers being seed or nucleation layers
- H10W20/043—Manufacture or treatment of conductive parts of the interconnections of conductive barrier, adhesion or liner layers the barrier, adhesion or liner layers being seed or nucleation layers for electroplating
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- H10W20/031—Manufacture or treatment of conductive parts of the interconnections
- H10W20/032—Manufacture or treatment of conductive parts of the interconnections of conductive barrier, adhesion or liner layers
- H10W20/042—Manufacture or treatment of conductive parts of the interconnections of conductive barrier, adhesion or liner layers the barrier, adhesion or liner layers being seed or nucleation layers
- H10W20/044—Manufacture or treatment of conductive parts of the interconnections of conductive barrier, adhesion or liner layers the barrier, adhesion or liner layers being seed or nucleation layers for electroless plating
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- H10W20/40—Interconnections external to wafers or substrates, e.g. back-end-of-line [BEOL] metallisations or vias connecting to gate electrodes
- H10W20/41—Interconnections external to wafers or substrates, e.g. back-end-of-line [BEOL] metallisations or vias connecting to gate electrodes characterised by their conductive parts
- H10W20/42—Vias, e.g. via plugs
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- H10W20/41—Interconnections external to wafers or substrates, e.g. back-end-of-line [BEOL] metallisations or vias connecting to gate electrodes characterised by their conductive parts
- H10W20/425—Barrier, adhesion or liner layers
Definitions
- the present invention relates to a method of forming a seed layer in a high aspect ratio via and a semiconductor device having a high aspect ratio via formed by the method.
- metal wirings formed in semiconductor devices are becoming smaller and more multilayered. As described above, when the width of the metal wiring is narrowed, a signal delay occurs due to the resistance and capacitance of the metal wiring. Therefore, copper, which is a low resistance metal, is used to reduce such signal delay.
- copper used for metal wiring is formed by electroplating or electroless plating in grooves or holes formed in a substrate.
- a seed layer may be previously formed in grooves or holes (hereinafter, also referred to as vias) formed in the substrate.
- the aspect ratio (average depth to average width) of vias formed on the substrate becomes greater than 10: 1, making peeling Cu easier.
- a seed layer of relatively uniform and moderate thickness to be formed on the underside or side of the via to enable robust deposition.
- An object of the present invention is to form a seed layer layer having a uniform and sufficient thickness on both side and bottom surfaces of a high aspect ratio via so as to improve plating adhesion with copper to be peeled, and to sufficiently secure an opening area of a via. It is to provide a semiconductor device having a high aspect ratio via formed by the forming method and the method excellent in durability.
- Another object of the present invention is to provide a method of forming a seed layer which can effectively reduce the stress of the seed layer, and a semiconductor device having high aspect ratio vias formed by the method to improve plating adhesion.
- the object of the present invention is not limited to the above-mentioned object, and even if not explicitly stated, the object of the invention that can be recognized by those skilled in the art can be naturally included from the description of the detailed description below. .
- the present invention comprises the steps of: preparing a substrate on which a via is formed; And forming a seed layer on the substrate, wherein the via has an average depth of 10 times or more with respect to an average width based on a cross section, and the forming of the seed layer includes forming the seed layer forming material.
- a method of forming a seed layer in a high aspect ratio via in which at least one of an inclination movement of tilting the substrate up, down, left, and right and a rotational movement of the substrate is performed intermittently or continuously so that the substrate is deposited at a predetermined angle or less. do.
- the constant angle is not more than 2.86 ° as the angle ( ⁇ ) represented by the following formula (1).
- the step of forming the seed layer comprises a first step of controlling the pressure to 7 ⁇ 13mtorr and a second step of controlling to 2.5 ⁇ 5mtorr.
- the step of forming the seed layer further comprises a third step of controlling the pressure to 0.5 ⁇ 2mtorr after the second step.
- the forming of the seed layer is performed by applying a target power of 2 ⁇ 5kW.
- the forming of the seed layer is performed by applying a bias to the substrate.
- the seed layer is a Mo or Cu seed layer.
- the thickness of the seed layer is 20nm ⁇ 1 ⁇ m.
- the vias have an opening cross-sectional area of at least 50% relative to the seed layer formation prior to seed layer formation, as viewed from the top.
- the method further comprises the step of peeling the plated Cu on the substrate.
- the present invention is a substrate formed with a via having an aspect ratio of 1:10 or more to 1:60 or less; A seed layer formed on the substrate; The semiconductor device having a high aspect ratio via, wherein the opening cross-sectional area of the via in the state where the seed layer is formed is 50% or more compared to the opening cross-sectional area of the via before forming the seed layer.
- the seed layer when the seed layer is formed of at least one material selected from Cu and MO, the seed layer further includes a Cu peeling layer filled on the seed layer and filled in the via.
- the thickness of the seed layer is 20nm ⁇ 1 ⁇ m.
- the seed layer is a multilayer structure in which Mo seed layer and Cu seed layer are alternately stacked.
- a smooth copper peeling plating is possible, and the plating adhesion between the seed layer and the peeled copper can be improved simply and economically, thereby providing excellent durability in forming metal wiring of an electronic component.
- the plating adhesion can be improved by reducing the stress of the seed layer.
- FIG. 1 illustrates a substrate on which vias are formed.
- FIG. 2 is a schematic diagram showing a seed layer forming material deposited on a substrate from a target.
- FIG 3 is a view schematically showing the formation of the seed layer inside the via according to the angle of the substrate, (a) is the angle of the direction in which the seed layer forming material is deposited on the substrate and the side of the via formed on the substrate is 0 (B) shows the case where an angle exceeds 2.86 degrees.
- FIG. 5 is a schematic view for explaining a method of calculating the angle of the substrate according to the aspect ratio of the via.
- 6 is an example of an SEM photograph of the surface of Mo after deposition of Mo on a silicon substrate.
- FIG. 8 is an example of an SEM photograph of a seed layer having a multilayered structure in which Mo seed layers and Cu seed layers are alternately stacked.
- Figure 9 is a SEM photograph of the vias of the invention examples according to an embodiment of the present invention, (a) is invention example 1, (b) is invention example 2, (c) is invention example 3, (d) foot It is a photograph of honor 4.
- FIG. 10 is an SEM photograph of vias of comparative examples according to an example of the present invention, wherein (a) is a comparative example 1 and (b) is a photograph of comparative example 2.
- FIG. 10 is an SEM photograph of vias of comparative examples according to an example of the present invention, wherein (a) is a comparative example 1 and (b) is a photograph of comparative example 2.
- FIG. 11 is an SEM photograph of a via of Inventive Example 8 according to an embodiment of the present invention.
- FIG. 1 illustrates a substrate on which vias are formed, (a) is a perspective view, and (b) is a front view.
- vias 12 are formed in the substrate 10 to form metal wires.
- the via may be formed to penetrate the substrate as in the form of a hole, and one side of the substrate may be opened and closed, and the other side may be formed in a closed form, such as a groove.
- copper may be peeled and plated on the substrate on which the via is formed to form a metal wire, thereby being used as a component of an electronic component.
- a seed layer may be deposited on the via. The seed layer acts as a wiring or an electrode to allow electricity to pass through the plating to a non-electric substrate.
- the aspect ratio of the vias formed on the substrate becomes considerably larger than 10: 1, which leads to narrowing of the openings of the vias, which is formed inside the vias.
- the deposition of seed layers becomes more and more difficult, or copper becomes difficult to penetrate into vias during peel plating. That is, the higher the aspect ratio, the narrower the via width, so that seed layers are not deposited on the bottom or side of the via.
- the seed layer may be preferentially deposited on the side surface of the via to form a thick layer.
- the lower side has a disadvantage that the deposition of the seed layer is not easy.
- an embodiment of the present invention comprises the steps of preparing a substrate (via) is formed; And forming a seed layer on the substrate, wherein the via has an average depth of 10 times or more with respect to an average width based on a cross section, and the forming of the seed layer includes forming the seed layer forming material.
- a method of forming a seed layer in a high aspect ratio via is performed by tilting the substrate up, down, left, and right so as to be deposited at a predetermined angle or less.
- the predetermined angle is an angle ⁇ represented by Equation 1 below, and the angle ⁇ may be 2.86 ° or less.
- the substrate to be applied to the present invention is not particularly limited as long as a via having a ratio of an average depth and an average width (aspect ratio) of 10: 1 or more is formed, for example, glass, plastic, ceramic, or the like may be applied.
- a via having a ratio of an average depth and an average width (aspect ratio) of 10: 1 or more is formed, for example, glass, plastic, ceramic, or the like may be applied.
- silicone may be used.
- the upper limit of the aspect ratio of the via is not particularly limited, but it is not easy for the aspect ratio to exceed 60 times due to process limitations.
- various methods such as evaporation, sputtering, chemical vapor deposition (CVD), and atomic layer deposition (ALD) may be used to form the seed layer on the substrate, and thus the type of seed layer formation method is not particularly limited. Do not.
- the seed layer forming material is deposited by tilting the substrate within a predetermined angle range. More specifically, it is preferable to form the seed layer by tilting the substrate up, down, left and right so that the angle ⁇ represented by the above [Equation 1] is deposited at 2.86 ° or less.
- FIG. 2 is a schematic diagram showing a state in which a seed layer forming material is deposited on a substrate from a target.
- the seed layer forming material 50 bounced off the target 20 by an inert gas such as Ar 40 is deposited on the substrate 30.
- the seed layer is formed by tilting the substrate 30 such that an angle ⁇ formed between a direction in which the seed layer forming material 50 is deposited and a side surface of the via formed on the substrate 30 is 2.86 ° or less. It is preferable.
- the seed layer forming method of the present invention can be parallel to form the seed layer without tilting the substrate, that is, at an angle of 0 °.
- the deposition direction of the seed forming material and the side of the via are parallel to each other. Deposition may not be performed properly, and if it exceeds 2.86 °, only some side of the via may be coated, resulting in a uniform coating on the inside of the via, i.e., bottom and side.
- FIG. 3 is a view schematically showing the formation of the seed layer in the via according to the angle of the substrate, (a) is the angle of the direction in which the seed layer forming material is deposited on the substrate and the side of the via formed on the substrate is 0 (B) shows the case where an angle exceeds 2.86 degrees.
- FIG. 3A when the angle between the seed layer forming material is deposited and the via side direction is 0 °, the side surface portion of the via may not be deposited with the seed layer forming material.
- Figure 3 (b) when the angle is greater than 2.86 ° deposition of the seed layer forming material only a portion of the side of the via, the bottom of the via and some other side may not occur deposition.
- the direction in which the seed layer forming material 50 is deposited on the substrate 30 and the angle ⁇ of the substrate 30 preferably satisfy a range of 2.86 ° or less.
- the substrate is preferably inclined up, down, left, and right.
- the left, right, up and down is based on the longitudinal direction of the substrate, it means that the width direction of the substrate is up and down, even if the opposite direction is included in the scope of the present invention.
- the order of the substrate tilting direction is not particularly limited as long as the substrate is inclined once, up, down, left, and right.
- the substrate is tilted only left and right, more seed layers are deposited in the left and right directions than in the up and down directions of the vias, thereby reducing the opening area of the vias, which makes it difficult to deposit the seed layer inside the vias. Or copper peel plating is not performed smoothly.
- the opening area of the via can be made as large as possible by performing one or more of the tilting motion of tilting the substrate up, down, left, and right and the rotational movement of the substrate, and at the same time, a seed layer having a uniform and sufficient thickness can be formed inside the via.
- the rotational movement of the substrate includes a case in which the substrate rotates without rotating, when the substrate rotates while rotating.
- the variation of the tilting direction caused by at least one of the tilting motion and the rotational motion of the substrate may be intermittently or continuously.
- the intermittent fluctuation may include tilting the substrate in one of up, down, left, and right directions to form a seed layer for a predetermined time, and then tilting the substrate in a different direction in a state in which the seed layer formation is stopped. Formation for a predetermined time is repeated continuously, and continuous variation means that both the seed formation and the tilt variation of the substrate are continuously performed.
- the range of the angle is determined according to the average depth (aspect ratio) with respect to the aforementioned average width, the calculation method will be described with reference to FIG.
- the calculation method in order to achieve a uniform coating on the bottom and side of the via, it is preferable to be based on the position of the half of the width of the via, it can be established according to the above equation 1 .
- the maximum angle at which the substrate can be tilted is 2.86 It becomes °.
- the seed layer deposition is most open on the side of the via. More preferably. That is, when the aspect ratio is 10: 1, the optimum angle of the substrate tilt is 2.86 degrees.
- those of ordinary skill in the art can easily calculate the optimum angle according to the aspect ratio of the via through the calculation method.
- the opening area of the via can be secured considerably, and the seed layer forming material is formed in the via. It can be uniformly deposited on both bottom and side surfaces. Through this, the peeling plating can be facilitated, and the plating adhesion between the seed layer and the peeling plating can be improved simply and economically. In addition, the plating adhesion can be secured to an excellent level, it is possible to give excellent durability when forming the metal wiring of the electronic component.
- the size of the particle width of the columnar tissue of the microstructure is controlled. It is possible to control the change of stress, such as tensile stress or compressive stress of the seed layer layer, thereby reducing the stress.
- the pressure when the pressure is less than 7 mtorr when forming the first step seed layer, it may be difficult to reduce the particle width of the columnar tissue to reduce the stress, and when it exceeds 13 mtorr, a specific resistance may increase. .
- the pressure when the pressure is less than 2.5 mtorr during the formation of the second step seed layer, the change in the particle width of the columnar tissue may increase rapidly, so that it may not be easy to control stress.
- the seed layer exceeds 5 mtorr, the seed layer having a high resistivity is thickly formed. Problems may arise.
- a film having different properties may be formed, resulting in a decrease in adhesion between the seed layer layers or an increase in stress. Therefore, after the second step, it is preferable that a third step of controlling the pressure to 0.5 to 2 mtorr is further performed. Through this, adhesion between the seed layer layers may be improved and stress may be further reduced.
- the seed layer is preferably formed by applying a target power of 2 ⁇ 5kW.
- a target power of 2 ⁇ 5kW.
- the forming of the seed layer is preferably performed by applying a bias to the substrate.
- a bias to the substrate as described above, the metal ions can be attracted to the substrate to improve the adhesion and density of the seed layer to improve the conductivity and adhesion.
- the seed layer of this invention is Mo or Cu seed layer.
- the Cu seed layer may exhibit an effect of increasing the adhesion to the Cu to be later peeled plating.
- the Mo seed layer not only has excellent strength, but also serves to prevent Cu deposited thereafter from being diffused into the substrate. In addition, there is an advantage of having excellent adhesion with Cu. Accordingly, it is more advantageous if the seed layer is Mo.
- FIG. 6 is an example of an SEM photograph of the surface of Mo after deposition of Mo on a silicon substrate. As shown in Figure 6, the surface of the Mo is formed with a projection such as a spine to increase the contact area between the silicon and the copper to be peel-plated, thereby improving the adhesion.
- FIG. 7 is an example of an SEM photograph of observing the side of Mo after depositing Mo on a silicon substrate.
- another property of Mo is that it forms a columnar structure (columnar struucture).
- the width of the columnar tissue can be adjusted by controlling process conditions such as pressure and temperature during sputtering for seed layer formation. Since the electrical conductivity also varies depending on the width of the columnar tissue, it is possible to secure the electrical conductivity characteristics to be obtained by controlling the width of the columnar tissue. In addition, the adhesion also varies depending on the width of the columnar tissue.
- a Mo seed layer may be further formed on the Cu seed layer. That is, by forming a seed layer composed of a double structure of a Mo seed layer and a Cu seed layer on the substrate, the adhesion to Cu to be peeled and plated can be improved to a more excellent level. Furthermore, the additionally formed Mo or Cu seed layer can also be deposited by tilting the substrate as described above.
- the present invention may further include forming a seed layer such that the Mo seed layer and the Cu seed layer are alternately stacked after the seed layer is additionally formed as described above.
- FIG. 8 is an SEM photograph of a seed layer having a multilayered structure in which Mo seed layers and Cu seed layers are alternately stacked. As shown in FIG. 8, by stacking layers of several to several tens of nm thick in alternating layers, the surface morphology of the microstructure may be controlled, the stress of the seed layer may be reduced, and the adhesion may be improved. More specifically, the shape and crystal orientation of the particles of one type of seed layer can be reduced, thereby enabling the formation of a seed layer closer to the conformal coating.
- the seed layer may be stacked in several layers or more than a few hundred layers.
- the seed layer is formed on the substrate through the above method, the seed layer is formed not only inside the via but also on the substrate. Therefore, it is necessary to remove the seed layer formed on the substrate surface except inside the via, depending on the component applied. To this end, the surface of the substrate, except for vias, may be covered by the deposition preventing film, and then the seed layer may be formed. Alternatively, after forming the seed layer, the seed layer may be removed by etching, mechanical processing, or the like except for portions formed in holes or grooves of the substrate.
- the thickness of the seed layer obtained by the seed layer formation method proposed by the present invention has a range of 20 nm to 1 ⁇ m.
- the thickness of the seed layer is less than 20nm, sufficient electrical conductivity is not secured, so sufficient current density may not be obtained during copper peeling plating, peeling plating may not be smooth, and diffusion prevention may not be effectively performed. Excessive thickness may block the inlet of the via, making copper fill plating difficult. Therefore, the thickness of the seed layer preferably has a range of 20 nm to 1 ⁇ m, and more preferably 40 nm to 1 ⁇ m.
- the via cross-sectional area of the via after the seed layer is formed is 50% or more, based on when the via is viewed from the top, before the seed layer is formed.
- the seed layer forming material easily penetrates into the via when the seed layer is formed, and is deposited on both the bottom and the side of the via, thereby forming a seed layer having a uniform thickness.
- peeling Cu also facilitates penetration into the via, thereby forming a metal wiring having excellent characteristics.
- the method may further include peeling and plating Cu on the seed layer, thereby manufacturing a substrate on which metal wires that can be applied to the semiconductor device are formed. . Since the said Cu peeling plating can apply all the conventional methods in the said technical field, the method is not specifically limited.
- the semiconductor device having the high aspect ratio via of the present invention has an aspect ratio of the via formed on the substrate having a aspect ratio of 1:10 or more and 1:60 or less. Even when the seed layer is formed, it can be seen that the opening cross-sectional area of the via in the state where the seed layer is formed is 50% or more compared to the opening cross-sectional area of the via before forming the seed layer, based on the view from the top.
- the semiconductor device having the high aspect ratio via of the present invention has a seed layer having a sufficient thickness, that is, a thickness of 20 nm to 1 ⁇ m, to facilitate peeling plating, and also sufficiently secures the opening area of the via after the seed layer is formed. Can be.
- the opening cross-sectional area is expressed as Percent of Via Open (PVO), and the PVO refers to the ratio of the opening cross-sectional area after the seed layer formation to the opening cross-sectional area before the seed layer formation.
- PVO Percent of Via Open
- the PVO refers to the ratio of the opening cross-sectional area after the seed layer formation to the opening cross-sectional area before the seed layer formation.
- PVO (%) opening cross-sectional area of vias after seed layer formation / opening cross-sectional area of vias before seed layer formation ⁇ 100
- 9a to 9d are SEM photographs of the vias of the inventive examples according to an embodiment of the present invention, (a) is invention example 1, (b) is invention example 2, and (c) is invention example 3, (d) ) Is a photograph of Inventive Example 4.
- 10A and 10B are SEM photographs of vias of comparative examples according to an exemplary embodiment of the present invention, and (a) is comparative example 1 and (b) is photograph of comparative example 2.
- the seed layer is formed so that the opening of the via is close to the circle, and the opening is also sufficiently opened.
- Figs. 10A and 10B in the case of Comparative Examples 1 and 2, it can be seen that the openings of the vias are elliptical, and the openings are substantially blocked.
- the substrate After preparing a silicon substrate with an average depth of 100 ⁇ m and a via having an average width of 10 ⁇ m, and a Mo target of 450 mm x 120 mm x 6.35 mm, the substrate is tilted up, down, left, and right at an angle of 2.86 ° and the substrate is rotated simultaneously.
- the seed layer was formed by performing sputtering in two stages by changing the pressure condition as shown in Table 3 below. After measuring the sheet resistance and stress for the seed layer formed as described above, the results are shown in Table 3 below.
- FIG. 11 is an SEM photograph of a via of Inventive Example 8 according to an embodiment of the present invention.
- the seed layer is formed such that the opening of the via is close to a circle, and the cross-sectional area of the opening is also high.
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Abstract
Description
| Mo 스퍼터링 조건 | Cu 스퍼터링 조건 | 기판 기울임 방향 | |||||||
| DC파워(kW) | 압력(mtorr) | RF바이어스(kW) | 시간(분) | DC파워(kW) | 압력(mtorr) | RF바이어스(kW) | 시간(분) | ||
| 발명예1 | - | - | - | - | 5 | 1 | 1 | 20 | 상하좌우 |
| 발명예2 | - | - | - | - | 5 | 1 | - | 20 | 상하좌우기판자전 |
| 발명예3 | 2 | 1.2 | - | 16 | 2 | 3 | - | 10 | 상하좌우기판자전 |
| 발명예4 | 2 | 1.2 | - | 16 | 2 | 1 | - | 20 | 상하좌우 |
| 비교예1 | 4.8 | 1 | 1 | 20 | 5 | 1 | 1 | 20 | 좌우 |
| 비교예2 | 4.8 | 1 | 1 | 10 | 5 | 1 | 1 | 20 | 좌우 |
| 두께 (nm) | 비저항(μΩㆍcm) | PVO(%) | |
| 발명예1 | 48.4 | 1.895 | 57.83 |
| 발명예2 | 87.2 | 1.994 | 62.38 |
| 발명예3 | 46.7 | 2.61 | 64.4 |
| 발명예4 | 69.2 | 2.29 | 51.8 |
| 비교예1 | 37.9 | - | 26.38 |
| 비교예2 | 17.5 | 2.01 | 41.38 |
| Mo 스퍼터링 조건 | Cu 스퍼터링 조건 | 면저항(μΩ/□) | 스트레스(GPa) | |||||
| DC파워(kW) | 압력(mtorr) | 시간(분) | DC파워(kW) | 압력(mtorr) | 시간(분) | |||
| 발명예5 | 2 | 10 | 20 | 2 | 2.5 | 20 | 43.645 | -0.1779 |
| 발명예6 | 2 | 10 | 40 | - | - | - | 37.74 | 1.2093 |
| Mo 스퍼터링 조건 | Cu 스퍼터링 조건 | 총시간(분) | 두께(nm) | 비저항(μΩㆍcm) | PVO(%) | 스트레스(GPa) | |||
| DC파워(kW) | 압력(mtorr) | DC파워(kW) | 압력(mtorr) | ||||||
| 발명예7 | 2 | 2.5 | 2 | 2.5 | 60 | 37.9 | 11.25 | 64.3 | -0.6362 |
| 발명예8 | 4 | 2.5 | 3 | 2.5 | 30 | 42.3 | 2.99 | 53.6 | -0.2936 |
Claims (16)
- 비아(via)가 형성된 기판을 준비하는 단계; 및상기 기판 상에 씨드 레이어를 형성하는 단계를 포함하며,상기 비아는 단면을 기준으로 할 때 평균 깊이가 평균 폭에 대하여 10배 이상이고,상기 씨드 레이어를 형성하는 단계는 상기 씨드 레이어 형성 물질이 일정각도 이하로 증착되도록 상기 기판을 상하좌우로 기울이는 기울임 운동 및 기판의 회전운동 중 하나 이상을 수행하되 상기 기판의 변동방향이 단속적으로 또는 연속적으로 이루어지는 고종횡비 비아에 씨드 레이어를 형성시키는 방법.
- 제 1 항에 있어서,상기 일정각도는 하기 식1로 표현되는 각도(θ)로서 2.86°이하인 것을 특징으로 하는 고종횡비 비아에 씨드 레이어를 형성시키는 방법.[식 1]: θ = arccos[D/((D2+(1/2W)2)1/2 )](단, D는 비아의 깊이이며, W는 비아의 폭임.)
- 제 1 항에 있어서,상기 씨드 레이어를 형성하는 단계는 압력을 7~13mtorr로 제어하는 제1단계와 2.5~5mtorr로 제어하는 제2단계를 포함하여 이루어지는 것을 특징으로 하는 고종횡비 비아에 씨드레이어를 형성시키는 방법.
- 제 3 항에 있어서,상기 씨드 레이어를 형성하는 단계는 상기 제2단계 후, 압력을 0.5~2mtorr로 제어하는 제3단계를 더 포함하여 이루어지는 것을 특징으로 하는 고종횡비 비아에 씨드 레이어를 형성시키는 방법.
- 제 1 항에 있어서,상기 씨드 레이어를 형성하는 단계는 2~5kW의 타겟 파워를 인가하여 이루어지는 것을 특징으로 하는 고종횡비 비아에 씨드 레이어를 형성시키는 방법.
- 제 1 항에 있어서,상기 씨드 레이어를 형성하는 단계는 상기 기판에 바이어스를 인가하여 이루어지는 것을 특징으로 하는 고종횡비 비아에 씨드 레이어를 형성시키는 방법.
- 제 1 항에 있어서,상기 씨드 레이어는 Mo 또는 Cu 씨드 레이어인 것을 특징으로 하는 고종횡비 비아에 씨드 레이어를 형성시키는 방법.
- 제 7 항에 있어서,상기 Mo 또는 Cu 씨드 레이어를 형성하는 단계 후, 상기 Mo 씨드 레이어 상에 Cu 씨드 레이어를 추가로 형성하거나 Cu 씨드 레이어 상에 Mo 씨드 레이어를 추가로 형성하는 단계를 더 포함하는 것을 특징으로 하는 고종횡비 비아에 씨드 레이어를 형성시키는 방법.
- 제 8 항에 있어서,상기 씨드 레이어를 추가로 형성하는 단계 후, Mo 씨드 레이어와 Cu 씨드 레이어가 교대로 적층되도록 추가로 씨드 레이어를 형성하는 단계를 더 포함하는 것을 특징으로 하는 고종횡비 비아에 씨드 레이어를 형성시키는 방법.
- 제 1 항 내지 제 9 항 중 어느 한 항에 있어서,상기 씨드 레이어의 두께는 20nm~1㎛인 것을 특징으로 하는 고종횡비 비아에 씨드 레이어를 형성시키는 방법.
- 제 1 항 내지 제 9 항 중 어느 한 항에 있어서,상기 비아는 상부에서 바라보았을 때를 기준으로 하여, 씨드 레이어 형성 후비아의 개구부 단면적은 씨드 레이어 형성 전에 비하여 50%이상인 것을 특징으로 하는 고종횡비 비아에 씨드 레이어를 형성시키는 방법.
- 제 1 항 내지 제 9 항 중 어느 한 항에 있어서,상기 씨드 레이어가 Mo 또는 Cu 씨드 레이어인 경우, 상기 씨드 레이어를 증착하는 단계 후, 기판에 Cu를 필링 도금하는 단계를 추가로 포함하는 것을 특징으로 하는 고종횡비 비아에 씨드 레이어를 형성시키는 방법.
- 1:10 이상 ~ 1:60 이하의 종횡비를 갖는 비아가 형성된 기판; 및상기 기판 상에 형성된 씨드레이어; 를 포함하는데,상부에서 바라보았을 때를 기준으로 하여, 씨드 레이어가 형성된 상태의 비아의 개구부 단면적이 씨드 레이어 형성 전 비아의 개구부 단면적과 비교하여 50%이상인 것을 특징으로 하는 고종횡비 비아를 갖는 반도체 소자.
- 제 13 항에 있어서,상기 씨드레이어가 Cu 및 MO 중에서 선택된 적어도 하나의 물질로 형성된 경우, 상기 씨드 레이어 상에 필링 도금되어 상기 비아 내부에 충진되는 Cu 필링층을 더 포함하는 것을 특징으로 하는 고종횡비 비아를 갖는 반도체 소자.
- 제 13 항에 있어서,상기 씨드 레이어의 두께는 20nm~1㎛인 것을 특징으로 하는 고종횡비 비아를 갖는 반도체 소자.
- 제 13 항에 있어서,상기 씨드 레이어는 Mo 씨드 레이어와 Cu 씨드 레이어가 교대로 적층된 다층구조인 것을 특징으로 하는 고종횡비 비아를 갖는 반도체 소자.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE112014001729.9T DE112014001729B4 (de) | 2013-03-29 | 2014-03-24 | Verfahren zum Bilden einer Keimschicht auf einem Durchgangsloch mit hohem Aspektverhältnis und Halbleitereinrichtung mit einem Durchgangsloch mit hohem Aspektverhältnis |
| US14/781,115 US9953867B2 (en) | 2013-03-29 | 2014-03-24 | Method for forming seed layer on high-aspect ratio via and semiconductor device having high-aspect ratio via formed thereby |
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| Application Number | Priority Date | Filing Date | Title |
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| KR1020130034764A KR101427140B1 (ko) | 2013-03-29 | 2013-03-29 | 고종횡비 비아에 씨드 레이어를 형성시키는 방법 |
| KR10-2013-0034764 | 2013-03-29 |
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| KR (1) | KR101427140B1 (ko) |
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| US12104243B2 (en) * | 2021-06-16 | 2024-10-01 | Applied Materials, Inc. | Methods and apparatus for processing a substrate |
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| KR20010032498A (ko) * | 1997-11-26 | 2001-04-25 | 조셉 제이. 스위니 | 손상없는 스컵쳐 코팅 증착 |
| KR20010051740A (ko) * | 1999-11-16 | 2001-06-25 | 조셉 제이. 스위니 | 시드층의 개선된 스텝 커버리지를 얻기 위한 압력 변조 방법 |
| KR100447323B1 (ko) * | 2002-03-22 | 2004-09-07 | 주식회사 하이닉스반도체 | 반도체 소자의 물리기상 증착 방법 |
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| TWI223873B (en) | 1998-09-24 | 2004-11-11 | Applied Materials Inc | Nitrogen-containing tantalum films |
| US6046097A (en) * | 1999-03-23 | 2000-04-04 | United Microelectronics Corp. | Deposition method with improved step coverage |
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| US7666787B2 (en) | 2006-02-21 | 2010-02-23 | International Business Machines Corporation | Grain growth promotion layer for semiconductor interconnect structures |
| US10221496B2 (en) | 2008-11-26 | 2019-03-05 | Macdermid Enthone Inc. | Copper filling of through silicon vias |
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2013
- 2013-03-29 KR KR1020130034764A patent/KR101427140B1/ko active Active
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2014
- 2014-03-24 DE DE112014001729.9T patent/DE112014001729B4/de active Active
- 2014-03-24 US US14/781,115 patent/US9953867B2/en active Active
- 2014-03-24 WO PCT/KR2014/002437 patent/WO2014157883A1/ko not_active Ceased
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20010032498A (ko) * | 1997-11-26 | 2001-04-25 | 조셉 제이. 스위니 | 손상없는 스컵쳐 코팅 증착 |
| KR100717086B1 (ko) * | 1999-03-09 | 2007-05-29 | 어플라이드 머티어리얼스, 인코포레이티드 | 화학 기상 증착에 의해 증착된 구리의 밀착성을 강화하기위한 방법 |
| KR20010051740A (ko) * | 1999-11-16 | 2001-06-25 | 조셉 제이. 스위니 | 시드층의 개선된 스텝 커버리지를 얻기 위한 압력 변조 방법 |
| KR100447323B1 (ko) * | 2002-03-22 | 2004-09-07 | 주식회사 하이닉스반도체 | 반도체 소자의 물리기상 증착 방법 |
Also Published As
| Publication number | Publication date |
|---|---|
| US9953867B2 (en) | 2018-04-24 |
| KR101427140B1 (ko) | 2014-08-07 |
| US20160035620A1 (en) | 2016-02-04 |
| DE112014001729T5 (de) | 2016-01-14 |
| DE112014001729B4 (de) | 2022-08-18 |
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