WO2020178995A1 - 半導体装置 - Google Patents
半導体装置 Download PDFInfo
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- WO2020178995A1 WO2020178995A1 PCT/JP2019/008748 JP2019008748W WO2020178995A1 WO 2020178995 A1 WO2020178995 A1 WO 2020178995A1 JP 2019008748 W JP2019008748 W JP 2019008748W WO 2020178995 A1 WO2020178995 A1 WO 2020178995A1
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- side wall
- insulating film
- semiconductor device
- wall portion
- bonding
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- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/10—Details of semiconductor or other solid state devices to be connected
- H01L2924/102—Material of the semiconductor or solid state bodies
- H01L2924/1025—Semiconducting materials
- H01L2924/1026—Compound semiconductors
- H01L2924/1032—III-V
- H01L2924/10335—Indium phosphide [InP]
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/30—Technical effects
- H01L2924/301—Electrical effects
- H01L2924/30105—Capacitance
Definitions
- This application relates to a semiconductor device.
- a semiconductor device in which an air gap is provided between an electrode and a substrate in order to reduce the influence of the electrode of the bonding pad having a parasitic capacitance (see, for example, Patent Documents 1 to 3). ..
- the electrodes are separated from the substrate like a cantilever, and in Patent Document 2, the electrodes are elastically deformed. Therefore, even if the distance between the electrode and the substrate is not stable and the parasitic capacitance is suppressed, it is expected that the influence of the fluctuation will be large.
- JP-A-61-116848 page 2, upper right column to page 3, upper right column, FIGS. 1 to 3
- Japanese Patent Laid-Open No. 2010-258342 paragraphs 0015 to 0021, FIGS. 1 to 5 and 8 to 9
- Japanese Unexamined Patent Publication No. 7-79011 paragraphs 0039 to 0041, FIG. 8)
- the present application discloses a technique for solving the above problems, and an object thereof is to obtain a semiconductor device capable of stably reducing the parasitic capacitance.
- a semiconductor device disclosed in the present application includes a conductive semiconductor substrate on which a semiconductor circuit is formed, an insulating film deposited on a main surface of the conductive semiconductor substrate, a fixing portion fixed to the insulating film, and the fixing. And a bonding pad having a side wall portion rising from the side wall portion and an electrode portion connected to the side wall portion and arranged parallel to the main surface, the electrode portion having a space between the insulating film and the insulating film. It is characterized in that a portion that forms a portion and that is continuous with the side wall portion has at least one of a positional relationship of sandwiching a central portion of a bonding region with a bonding wire and surrounding the central portion.
- the side wall portion is arranged on the outer peripheral side of the electrode to form the void, it is possible to obtain the semiconductor device capable of stably reducing the parasitic capacitance.
- 1A to 1C are an end view perpendicular to a plan view of a semiconductor device according to a first embodiment and a plan view with a different cutting direction, respectively.
- 2A to 2F are end views showing states of the semiconductor device according to the first embodiment in stages during the manufacturing process.
- 3A to 3C are an end view perpendicular to a plan view of the semiconductor device according to the second embodiment and a plan view having a different cutting direction.
- 4A and 4B are a plan view of a semiconductor device according to a third embodiment and an end view perpendicular to the plan view, respectively.
- Embodiment 1. 1 and 2 are for explaining the configuration of the semiconductor device and the manufacturing method thereof according to the first embodiment
- FIG. 1 is a plan view (FIG. 1) of a portion of the semiconductor device in which one bonding pad is formed. 1A) and the end view (FIG. 1B) cut along the line BB of FIG. 1A and the end view cut along the line CC of FIG. 1A as end views perpendicular to the plan view with the bonding wire added. It is the end view (FIG. 1C) which did.
- 2A to 2F are end views corresponding to FIGS. 1B showing the state of each step in the process of forming the bonding pad on the conductive semiconductor substrate constituting the semiconductor device.
- directions are displayed with the plane parallel to the main surface of the semiconductor device as the xy plane and the thickness direction as the z direction.
- a semiconductor device is a semiconductor device in which active elements including semiconductor elements such as switching elements and rectifying elements, and in some cases, passive elements such as resistors and capacitors are formed on a conductive semiconductor substrate. It is a circuit configuration.
- the bonding pad which is a characteristic part of the present application, is electrically connected to the above-mentioned element constituting the semiconductor circuit via the wiring pattern formed on the insulating film covering the surface of the conductive semiconductor substrate. To electrically connect to the outside.
- the present application only the portion where one bonding pad is bonded on the insulating film that covers the conductive semiconductor substrate is described, and the description of the other portion including the connection portion between the bonding pad and the wiring pattern is omitted. Then, an explanation will be given.
- the semiconductor device 1 has an insulating film 3 deposited on a conductive semiconductor substrate 2 and a metal bonding pad 4 formed on the insulating film 3.
- the bonding pad 4 is a bonding target of the bonding wire 5 by wire bonding, that is, an electrode portion 4j serving as an electrode, and a fixing portion 4s having an end portion electrically connected to a wiring pattern (not shown) and fixed to the insulating film 3. Equipped with.
- Both the electrode portion 4j and the fixed portion 4s extend in parallel with the main surface of the conductive semiconductor substrate 2 so as to cover a predetermined range in the xy plane.
- the bonding pad 4 of the semiconductor device 1 according to the first embodiment extends in the direction away from the electrode portion 4j in the xy plane via the side wall portion 4w in which the electrode portion 4j extends in the thickness direction (z direction). It is connected to the fixed portion 4s.
- the electrode portion 4j has a size that includes the bonding region R5 for bonding the bonding wire 5 in the xy plane, and the side wall portion 4w and the fixing portion 4s are outside the bonding region R5. So, it is divided into four parts along the circumferential direction.
- a void portion 4g having a distance Dg is formed between the electrode portion 4j and the insulating film 3 including the junction region R5 in the xy plane direction.
- the central portion of the bonding region R5 of the electrode portion 4j is supported so as to be sandwiched by at least two side wall portions 4w of the four side wall portions 4w, while the void portion 4g has a side wall in the circumferential direction. Except for the part where the part 4w is provided, it communicates with the outside.
- FIGS. 2A to 2F show the end view corresponding to FIG. 1B as described above, and the state of the portion corresponding to FIG. 1C in which the side wall portion 4w and the fixing portion 4s are not arranged in the circumferential direction. And, the description about the resist and the like for forming the state is omitted.
- an insulating film 3 is deposited on a conductive semiconductor substrate 2 on which elements (not shown) that form a semiconductor circuit are formed, and a second portion is formed on the insulating film 3 where a void 4g is formed.
- One photoresist 8 is formed.
- a power feeding layer 41 made of metal is deposited on the convex surface formed by the first photoresist 8 and the exposed insulating film 3.
- a second photoresist 9 is formed on the outer edge of the deposited power supply layer 41, as shown in FIG. 2C.
- the plating layer 42 is formed on the surface of the portion of the power feeding layer 41 exposed from the second photoresist 9, as shown in FIG. 2D.
- the second photoresist 9 is removed with an organic solvent
- the portion 41e of the power supply layer 41 covered with the second photoresist 9 is removed by the ion milling method, as shown in FIG. 2E.
- the first photoresist 8 is removed with an organic solvent through the hollow portion shown in FIG. 1C where the side wall portion 4w in the circumferential direction is not formed.
- the bonding pad 4 having a two-layer structure of the power feeding layer 41 and the plating layer 42 and having the void portion 4 g between the insulating film 3 is formed.
- the conductive semiconductor substrate 2 is an n-type InP substrate
- the insulating film 3 is SiO 2
- the feeding layer 41 constituting the bonding pad 4 is Ti / Au.
- Au (gold) was used for the (titanium / gold) laminated structure and the plating layer 42.
- the semiconductor device 1 having the bonding pad 4 having the structure described in FIG. 1 can be easily obtained by the manufacturing method described in FIG. Further, even in the layer of the same metal type, in the layer formed by deposition by vapor deposition, sputtering method or the like, generally, a portion extending in the direction perpendicular to the surface (z direction) such as the side wall portion 4w is the fixed portion 4s.
- the electrode portion 4j has a smaller thickness and a lower density than a portion formed in a direction parallel to the surface.
- the side wall portion 4w portion also has the same thickness and density as the fixing portion 4s portion and the electrode portion 4j portion, so that the strength of the side wall portion 4w is increased and the resistance to be described later is increased. Deformability is improved.
- the factor that increases the parasitic capacitance of the bonding pad in the semiconductor device is the capacitance of the parallel plate formed by the semiconductor substrate and the bonding pad via the insulating film. This capacitance is proportional to the dielectric constant of the insulating film and the area of the parallel plate, and is inversely proportional to the thickness of the insulating film.
- the dielectric constant and thickness of the insulating film are determined by the physical properties of the insulating film and the manufacturing method.
- the relative permittivity is about 4, and the upper limit is determined by the thickness needing to be several ⁇ m or less in consideration of productivity and workability.
- the parallel plate capacitance is mainly determined by the area where the metal part of the bonding pad and the insulating film are in contact. Therefore, by adopting the structure having the void 4g between the bonding pad 4 and the insulating film 3 as in the present application, it is possible to reduce the parasitic capacitance as compared with the structure in which the entire bonding pad is in contact with the insulating film.
- the electrode portion 4j can be held without being deformed in the thickness direction against the force applied in the thickness direction (z direction) toward the conductive semiconductor substrate 2 during wire bonding. At that time, even when a force in a direction parallel to the xy plane is applied, the electrode portion 4j can be held without being deformed in either the x direction or the y direction.
- Patent Document 2 shows a configuration in which the electrode portion is floated by a frame-shaped insulating film.
- the thickness of the insulating film varies depending on the time or speed of deposition or removal, dimensional controllability is poor.
- Patent Document 2 since it is premised that the electrodes are elastically deformed originally, it is not necessary to consider such a problem. However, when the accuracy and stability of the interval are required, the dimensional variation is , Becomes a big problem.
- the case where the four side wall portions 4w are provided along the circumferential direction has been shown, but the number is not limited to this and may be more. Further, three may be arranged along the circumferential direction so as to surround the central portion from three places, or two may be arranged so as to sandwich the central portion between two. For example, even if there are only two combinations of the 3 o'clock direction and the 9 o'clock direction among the four combinations of the side wall part 4w and the fixing part 4s in FIG. 1A, the two side wall parts 4w have electrode parts. The central portion of 4j is sandwiched. Therefore, even if the electrode portion 4j is pressed in the thickness direction, the shape of the void portion 4g formed between the electrode portion 4j and the insulating film 3 (in particular, the distance Dg) is not deformed in the thickness direction. Can hold.
- the side wall portion 4w includes the central portion of the electrode portion 4j in the direction (y direction) perpendicular to the direction (x direction) of sandwiching the electrode portion 4j, and has a width that covers 1/3 or more of the joint region R5.
- the electrode portion 4j is not deformed not only in the x direction component but also in the y direction component and The shape of the void 4g formed between the insulating films 3 (in particular, the distance Dg) can be maintained.
- FIG. 3 is a plan view (FIG. 3A) of a portion of the semiconductor device according to the second embodiment in which one bonding pad is formed, and an end view perpendicular to the plan view in a state where a bonding wire is further added. It is an end view (FIG. 3B) cut along the line BB of FIG. 3A and an end view (FIG. 3C) cut along the line CC of FIG. 3A.
- the configuration other than the bonding pad portion and the manufacturing method are the same as those described in the first embodiment, and the same portions are described. Is omitted.
- the electrode portion 4j of the bonding pad 4 has an annular shape having an opening 4ja, and the side wall portion 4w and the fixing portion 4s have an annular shape. It is provided not only on the outer peripheral side but also on the inner peripheral side.
- the outer peripheral side has the same configuration as that of the side wall portion 4w and the fixed portion 4s, which are denoted by the reference numerals in the first embodiment, and a detailed description thereof will be omitted. Is added to the end and is referred to as a side wall portion 4wo and a fixed portion 4so.
- the electrode portion 4j extends in parallel with the main surface of the conductive semiconductor substrate 2 so as to cover a predetermined range in the xy plane and has a size including the bonding region R5. It has an annular shape having an opening 4ja having a diameter smaller than that of the region R5.
- the annular outer peripheral side is similar to that of the first embodiment as described above, but the inner peripheral side is connected with the cylindrical side wall portion 4wi, which should be referred to as the second side wall portion.
- the cylindrical side wall portion 4wi extends in the thickness direction (z direction) toward the insulating film 3, has a circular shape corresponding to the opening 4ja, and is closely attached to and fixed to the insulating film 3. Is connected to the fixed part 4si which should be called.
- a void portion 4g having a space Dg is formed in the annular region between the electrode portion 4j and the insulating film 3 surrounded by the side wall portion 4wo on the outer peripheral side and the side wall portion 4wi on the inner peripheral side. It will be. Since the fixed portion 4si on the inner peripheral side becomes a parallel plate, the effect of reducing the parasitic capacitance is lower than that in the first embodiment. However, for example, even when the diameter of the fixed portion 4si is set to about 1 ⁇ 3 of the outer diameter of the electrode portion 4j, the area where the parallel plate is formed is only about 10% of the range of the electrode portion 4j. It is considered that the parasitic capacitance can be reduced as in the first embodiment.
- the electrode portion 4j is supported not only by the outer peripheral side wall portion 4w described in the first embodiment but also by the inner peripheral side cylindrical side wall portion 4wi which is the second side wall portion. Therefore, in addition to the outer side wall portion 4wo, the support by the inner peripheral side side wall portion 4wi more reliably suppresses the deformation of the electrode portion 4j in the thickness direction, and is formed between the electrode portion 4j and the insulating film 3.
- the shape of the void 4g can be maintained.
- the side wall portion 4wi on the inner peripheral side opposes the force directly pressed in the thickness direction at the time of wire bonding without passing through the electrode portion 4j which is a beam, so that deformation can be prevented more firmly.
- the side wall portion 4wi on the inner peripheral side is applied, so that the electrode portion 4j is not deformed not only in the x-direction component but also in the y-direction component.
- the shape of the void 4g formed between the electrode portion 4j and the insulating film 3 can be held more firmly.
- the side wall portion 4wi on the inner peripheral side has a cylindrical shape, it is structurally highly effective in suppressing deformation in any orientation in the xy plane.
- FIG. 4 is a plan view (FIG. 4A) of a portion of the semiconductor device according to the third embodiment in which one bonding pad is formed, and an end view perpendicular to the plan view in a state where a bonding wire is further added. It is an end view (FIG. 4B) cut by the BB line of 4A.
- the side wall portion and the fixing portion described in the first embodiment have a cylindrical shape and an annular shape that are continuous in the circumferential direction, respectively, as shown in FIGS. 4A and 4B. Configured to. In that case, the void portion for removing the first photoresist 8 described in FIGS. 2E and 2F of the first embodiment does not exist on the outer peripheral side of the first photoresist 8, so that the communicating hole is formed in the electrode portion 4j. 4p is provided.
- the electrode portion 4j spreads in parallel with the main surface of the conductive semiconductor substrate 2 so as to cover a predetermined range in the xy plane, has a size including the bonding region R5, and is bonded to the central portion.
- a communication hole 4p having a diameter smaller than that of the region R5 is formed.
- the electrode portion 4j is supported by the side wall portion 4w over the entire circumference. Therefore, it is formed between the electrode portion 4j and the insulating film 3 by suppressing the bending of the electrode portion 4j and reliably suppressing the deformation in the thickness direction, as compared with the structure of holding intermittently shown in the first embodiment.
- the shape of the void 4g can be maintained.
- the side wall portion 4w is cylindrical, the effect of suppressing deformation is high in any direction in the xy plane structurally. Since the void 4g covers the same region as that of the first embodiment, the same effect of reducing the parasitic capacitance can be exhibited.
- the communication hole 4p does not necessarily have to be located in the central portion or in the bonding region R5, and may be formed at any position of the electrode portion 4j as long as the sacrificial layer (first photoresist 8) can be removed. May be. Alternatively, it may be formed on a part of the side wall portion 4w to the extent that the support of the electrode portion 4j is not lowered.
- the void 4g after bonding becomes a closed space.
- the sealing resin does not enter the void 4g, and the effect of reducing the parasitic capacitance due to the increase in the dielectric constant is impaired. Absent.
- the power feeding layer 41 constituting the n-type InP substrate as the conductive semiconductor substrate 2, the SiO 2 as the insulating film 3, and the bonding pad 4 has a Ti / Au laminated structure and the plating layer 42.
- Au is shown, but the present invention is not limited to this.
- the example in which the bonding pad 4 is formed by a laminated structure has been shown, but the present invention is not limited to this, and it is sufficient that the elements constituting the semiconductor circuit and the external circuit can be electrically connected by wire bonding.
- the gap portion 4g may be formed between the electrode portion 4j and the insulating film 3 by the side wall portion 4w that sandwiches the central portion of the bonding region R5 or surrounds the central portion of the bonding region R5.
- the conductive semiconductor substrate 2 on which the semiconductor circuit is formed the insulating film 3 deposited on the main surface of the conductive semiconductor substrate 2, and the insulating film.
- a bonding pad 4 having 4j and 4j is provided, the electrode portion 4j forms a gap portion 4g with the insulating film 3, and a portion connected to the side wall portion 4w is a bonding region R5 with the bonding wire 5.
- an opening 4ja is formed inside the bonding region R5 of the electrode portion 4j, and an insulating film is formed at a portion corresponding to the opening 4ja in a direction parallel to the main surface (xy plane direction). It has a second fixed portion (fixed portion 4si) fixed to 3 and a tubular second side wall portion (side wall portion 4wi) rising from the second fixed portion (fixed portion 4si), and is inside the opening 4ja. If the peripheral portion is configured to be connected to the second side wall portion (side wall portion 4wi), the tubular second side wall portion (side wall portion 4wi) supports the electrode portion 4j from the inner peripheral side, so that the bonding is performed. Deformation of the void portion 4g can be suppressed more firmly.
- the side wall portion 4w (or the side wall portion 4w) is continuous with the electrode portion 4j over the entire circumference, and a communication hole 4p communicating with the gap portion 4g is formed in at least one of the electrode portion 4j and the side wall portion 4w. Since the side wall portion 4w supports the electrode portion 4j over the entire circumference, it is possible to suppress the deformation of the void portion 4g at the time of bonding regardless of the direction of the force, so that the parasitic capacitance is reduced. It can be reduced stably.
- the void 4g becomes a closed space, and even if the resin is sealed, the resin is not filled in the void 4g.
- the parasitic capacitance can be surely reduced without invading.
- the bonding pad 4 includes a deposition layer (power feeding layer 41) formed on the side of the surface facing the insulating film 3 and a plating layer 42 formed on the side opposite to the power feeding layer 41.
- a deposition layer power feeding layer 41
- a plating layer 42 formed on the side opposite to the power feeding layer 41.
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Abstract
Description
図1と図2は、実施の形態1にかかる半導体装置の構成とその製造方法について説明するためのものであり、図1は半導体装置におけるひとつのボンディングパッドが形成された部分の平面図(図1A)と、さらにボンディングワイヤを追加した状態での、平面図に垂直な端面図として、図1AのB-B線で切断した端面図(図1B)と、図1AのC-C線で切断した端面図(図1C)である。また、図2A~図2Fは、半導体装置を構成する導電性半導体基板にボンディングパッドを形成する工程での段階ごとの状態を示す、図1Bに対応する端面図である。なお、以降の実施の形態も含め、図において、半導体装置における主面に平行な面をxy面、厚み方向をz方向として、方向表示している。
上記実施の形態1においては、電極部の外周部分のみに側壁部を設ける例について説明した。本実施の形態2においては、電極部の内周側にも側壁部を設けた例について説明する。図3は実施の形態2にかかる半導体装置におけるひとつのボンディングパッドが形成された部分の平面図(図3A)と、さらにボンディングワイヤを追加した状態での、平面図に垂直な端面図として、図3AのB-B線で切断した端面図(図3B)と、図3AのC-C線で切断した端面図(図3C)である。
上記実施の形態1または2においては、電極部の外周側の側壁部を周方向に沿って分割配置した例について説明した。本実施の形態3においては、外周側の側壁部を周方向で切れ目無く形成する一方、電極部に空隙部と外部を連通する連通孔を設けた例について説明する。図4は実施の形態3にかかる半導体装置におけるひとつのボンディングパッドが形成された部分の平面図(図4A)と、さらにボンディングワイヤを追加した状態での、平面図に垂直な端面図として、図4AのB-B線で切断した端面図(図4B)である。
Claims (5)
- 半導体回路が形成された導電性半導体基板と、
前記導電性半導体基板の主面に堆積された絶縁膜と、
前記絶縁膜に固定された固定部と、前記固定部から立ち上がる側壁部と、前記側壁部に連なり、前記主面に対して平行に配置された電極部と、を有するボンディングパッドと、を備え、
前記電極部は、
前記絶縁膜との間に空隙部を形成し、かつ、前記側壁部に連なる部分が、ボンディングワイヤとの接合領域の中央部を挟む、および前記中央部を囲む、の少なくともいずれかの位置関係にあることを特徴とする半導体装置。 - 前記ボンディングパッドは、
前記電極部の前記接合領域の内側に、開口部が形成されるとともに、
前記主面に平行な方向における前記開口部に対応する部分で前記絶縁膜に固定された第二固定部と、前記第二固定部から立ち上がる筒状の第二側壁部と、を有し、
前記開口部の内周部分が前記第二側壁部に連なっていることを特徴とする請求項1に記載の半導体装置。 - 前記側壁部は、前記電極部と全周にわたって連なっており、
前記電極部および前記側壁部の少なくともいずれかに、前記空隙部に連通する連通孔が形成されていることを特徴とする請求項1または2に記載の半導体装置。 - 前記連通孔は、前記ボンディングワイヤの接合により塞がれる位置に形成されていることを特徴とする請求項3に記載の半導体装置。
- 前記ボンディングパッドは、前記絶縁膜への対向面の側に形成された堆積層と、前記堆積層に対して、前記対向面の反対側に形成されたメッキ層との積層構造で構成していることを特徴とする請求項1から4のいずれか1項に記載の半導体装置。
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JP2021503322A JP7042967B2 (ja) | 2019-03-06 | 2019-03-06 | 半導体装置 |
PCT/JP2019/008748 WO2020178995A1 (ja) | 2019-03-06 | 2019-03-06 | 半導体装置 |
KR1020217027022A KR102564086B1 (ko) | 2019-03-06 | 2019-03-06 | 반도체 장치 |
US17/420,586 US11876061B2 (en) | 2019-03-06 | 2019-03-06 | Semiconductor device including bond pad with fixing parts fixed onto insulating film |
CN201980092558.8A CN113474871B (zh) | 2019-03-06 | 2019-03-06 | 半导体装置 |
TW109106214A TWI735167B (zh) | 2019-03-06 | 2020-02-26 | 半導體裝置 |
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2019
- 2019-03-06 WO PCT/JP2019/008748 patent/WO2020178995A1/ja active Application Filing
- 2019-03-06 JP JP2021503322A patent/JP7042967B2/ja active Active
- 2019-03-06 CN CN201980092558.8A patent/CN113474871B/zh active Active
- 2019-03-06 KR KR1020217027022A patent/KR102564086B1/ko active IP Right Grant
- 2019-03-06 US US17/420,586 patent/US11876061B2/en active Active
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TWI735167B (zh) | 2021-08-01 |
CN113474871A (zh) | 2021-10-01 |
US11876061B2 (en) | 2024-01-16 |
KR102564086B1 (ko) | 2023-08-07 |
JPWO2020178995A1 (ja) | 2021-09-13 |
TW202105653A (zh) | 2021-02-01 |
KR20210121125A (ko) | 2021-10-07 |
JP7042967B2 (ja) | 2022-03-28 |
US20220093544A1 (en) | 2022-03-24 |
CN113474871B (zh) | 2023-10-20 |
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