WO2023032653A1 - 半導体装置 - Google Patents
半導体装置 Download PDFInfo
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- WO2023032653A1 WO2023032653A1 PCT/JP2022/030909 JP2022030909W WO2023032653A1 WO 2023032653 A1 WO2023032653 A1 WO 2023032653A1 JP 2022030909 W JP2022030909 W JP 2022030909W WO 2023032653 A1 WO2023032653 A1 WO 2023032653A1
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Definitions
- the present disclosure relates to semiconductor devices.
- Patent Document 1 discloses a semiconductor device having a passivation film covering a surface electrode film of a transistor.
- a semiconductor device includes a semiconductor element and a conductive member.
- the semiconductor element includes a first wiring portion to which the conductive member is connected, a second wiring portion separated from the first wiring portion and at least partially surrounding the first wiring portion, the first wiring portion and and a passivation layer covering the second wiring portion.
- the passivation layer is positioned between a first opening exposing a portion of the first wiring portion as a connection region of the conductive member, and between the first opening and the second wiring portion. and a second slit exposing a portion of the second wiring portion.
- FIG. 1 is a schematic perspective view of an exemplary semiconductor device according to one embodiment.
- FIG. 2 is a schematic plan view of the semiconductor device with the conductive member removed.
- FIG. 3 is a schematic plan view of an exemplary semiconductor device.
- FIG. 4 is a schematic enlarged plan view of a semiconductor element surrounded by a two-dot chain line shown in FIG.
- FIG. 5 is a schematic cross-sectional view of the semiconductor device taken along line F5-F5 shown in FIG.
- FIG. 6 is a schematic cross-sectional view of the semiconductor device taken along line F6-F6 shown in FIG. 7 is a partially enlarged sectional view of FIG. 6.
- FIG. FIG. 8 is a schematic plan view of an exemplary semiconductor device according to a modification.
- FIG. 9 is a schematic enlarged plan view of a semiconductor element surrounded by a two-dot chain line shown in FIG.
- FIG. 10 is a schematic cross-sectional view taken along line F10-F10 shown in FIG.
- plan view means that an object (semiconductor device or component) is viewed in the Z direction of mutually orthogonal XYZ axes (see, for example, FIG. 1) unless explicitly stated otherwise. It means to look at
- FIG. 1 is a schematic perspective view of an exemplary semiconductor device 10 according to one embodiment.
- the semiconductor device 10 has, for example, a rectangular parallelepiped shape.
- the semiconductor device 10 may have, for example, a rectangular shape in plan view.
- the size of the semiconductor device 10 is not particularly limited.
- the semiconductor device 10 may have a lead frame structure, for example.
- semiconductor device 10 includes conductive plate 12 , first conductive terminal 14 , second conductive terminal 16 , and semiconductor element 20 .
- a semiconductor element 20 is mounted on the conductive plate 12 .
- the semiconductor device 10 includes a first conductive member 22 connecting the semiconductor element 20 to the first conductive terminals 14 and a second conductive member 24 connecting the semiconductor element 20 to the second conductive terminals 16.
- the semiconductor device 10 includes a sealing member 26 that seals the semiconductor element 20 .
- the semiconductor element 20 is bonded to the conductive plate 12 with a conductive bonding material 18 .
- Solder or conductive paste for example, can be used for the conductive bonding material 18 .
- the solder may be a lead (Pb)-free solder, such as a tin (Sn)-silver (Ag)-copper (Cu) system, or a lead-containing solder, such as a Sn--Pb--Ag system. good too.
- An example of a conductive paste is Ag paste.
- the conductive plate 12, the first and second conductive terminals 14, 16, and the first and second conductive members 22, 24 are made of metal material such as Cu or aluminum (Al).
- the semiconductor device 10 can be, for example, a surface mount type package. Although detailed illustration is omitted, each of the conductive plate 12 and the first and second conductive terminals 14 and 16 has an external connection surface partially exposed from the sealing member 26 to the back surface of the semiconductor device 10 . The external connection surfaces of the conductive plate 12 and the first and second conductive terminals 14 and 16 are electrically connected to a mounting board (not shown) when the semiconductor device 10 is mounted on the mounting board.
- the conductive plate 12 and the first and second conductive terminals 14, 16 can have any shape (outer shape) and thickness. Note that the thickness refers to the dimension (length) in the Z direction.
- the conductive plate 12 and the first and second conductive terminals 14, 16 are each plate-shaped, and the first and second conductive terminals 14, 16 extend along one side of the conductive plate 12 (the X direction in FIG. 1). along the edge).
- the conductive plate 12 includes a bonding surface 12S to which the semiconductor element 20 is bonded via the conductive bonding material 18.
- the first conductive terminal 14 includes a bonding surface 14S to which the first conductive member 22 is bonded via a conductive bonding material (for example, solder) (not shown).
- the second conductive terminal 16 includes a bonding surface 16S to which the second conductive member 24 is bonded via a conductive bonding material (for example, solder) (not shown).
- first and second conductive terminals 14, 16 may be provided at a position higher (that is, higher) than the joint surface 12S of the conductive plate 12 in the Z direction.
- first and second conductive terminals 14 and 16 may be formed at least partially thicker than conductive plate 12 .
- the length (connection distance) of the first conductive member 22 connecting the semiconductor element 20 and the first conductive terminal 14 and the length of the second conductive member 24 connecting the semiconductor element 20 and the second conductive terminal 16 are (connection distance) can be shortened.
- the first and second conductive members 22, 24 can have any shape (outer shape) and thickness.
- the first and second conductive members 22, 24 each have a bridge shape.
- a conductive member having a bridge shape, such as the first and second conductive members 22, 24, etc., may also be referred to as a clip.
- clips made of Cu may be referred to as Cu clips.
- the first conductive member 22 includes a first end 22F, a second end 22R, and an intermediate portion 22M positioned between the first end 22F and the second end 22R.
- the first end portion 22F is a flat plate portion.
- the first end portion 22F is a flat plate portion having an approximately L-shaped outer shape in a plan view, and is joined to the semiconductor element 20 by a conductive joining material (for example, solder) (not shown).
- the second end portion 22R is a flat plate portion.
- the second end portion 22R is a rectangular flat plate portion in plan view, and is joined to the joint surface 14S of the first conductive terminal 14 by a conductive joint material (not shown).
- the intermediate portion 22M is bent stepwise and connects the first end portion 22F and the second end portion 22R in a bridge shape.
- the second conductive member 24 includes a first end 24F, a second end 24R, and an intermediate portion 24M positioned between the first end 24F and the second end 24R.
- the first end portion 24F is a flat plate portion.
- the first end portion 24F is a flat plate portion having a rectangular shape in plan view, and is joined to the semiconductor element 20 by a conductive joining material (for example, solder or the like) (not shown).
- the second end portion 24R is a flat plate portion.
- the second end portion 24R is a flat plate portion having a rectangular shape in plan view, and is joined to the joint surface 16S of the second conductive terminal 16 by a conductive joint material (not shown).
- the second end portion 24R may be formed to have a larger size than the first end portion 24F.
- the intermediate portion 24M is bent stepwise and connects the first end portion 24F and the second end portion 24R in a bridge shape.
- the sealing member 26 can define the package outline of the semiconductor device 10 .
- the sealing member 26 seals the conductive plate 12 , a portion of the first conductive terminal 14 , a portion of the second conductive terminal 16 , the first conductive member 22 , and the second conductive member 24 together with the semiconductor element 20 .
- the sealing member 26 is made of an insulating resin material such as black epoxy resin.
- the semiconductor element 20 may be a switching element such as a transistor.
- the semiconductor element 20 may be a MISFET (Metal Insulator Semiconductor Field Effect Transistor).
- MISFET Metal Insulator Semiconductor Field Effect Transistor
- the semiconductor element 20 is not limited to a MISFET, and may be, for example, an IGBT (Insulated Gate Bipolar Transistor) or another transistor.
- FIG. 2 is a schematic plan view of the semiconductor device 10 with the first and second conductive members 22 and 24 removed.
- FIG. 3 is a schematic plan view of the semiconductor device 20.
- FIG. 2 shows a simplified plan view of the semiconductor element 20 of FIG.
- FIG. 4 is a schematic enlarged plan view of the semiconductor element 20 surrounded by the two-dot chain line F4 shown in FIG. 5 is a schematic cross-sectional view along line F5-F5 shown in FIG. 4, and FIG. 6 is a schematic cross-sectional view along line F6-F6 shown in FIG. 7 is a partially enlarged sectional view of FIG. 6.
- FIG. 4 is a schematic enlarged plan view of the semiconductor element 20 surrounded by the two-dot chain line F4 shown in FIG. 5 is a schematic cross-sectional view along line F5-F5 shown in FIG. 4
- FIG. 6 is a schematic cross-sectional view along line F6-F6 shown in FIG. 7 is a partially enlarged sectional view of FIG. 6.
- the semiconductor element 20 is configured as a transistor having a split gate structure.
- the semiconductor element 20 has a rectangular shape in plan view, and includes first to fourth sides 20A, 20B, 20C, and 20D defining the outer edge of the semiconductor element 20.
- the first and second sides 20A, 20B extend in the first direction (Y direction) in plan view.
- the third and fourth sides 20C and 20D extend in a second direction (X direction) orthogonal to the first direction in plan view.
- the Y direction may be called the first direction
- the X direction may be called the second direction.
- the first and second sides 20A, 20B have the same length
- the third and fourth sides 20C, 20D have the same length.
- the third and fourth sides 20C, 20D are shorter than the first and second sides 20A, 20B.
- the third and fourth sides 20C, 20D may be the same length as the first and second sides 20A, 20B, or may be the same length as the first and second sides 20A. , 20B.
- the semiconductor device 20 includes a semiconductor substrate 32, a semiconductor layer 34, and an insulating layer 36.
- the semiconductor substrate 32 is, for example, a silicon (Si) substrate.
- the semiconductor substrate 32 is a rectangular substrate in plan view including four sides corresponding to the first to fourth sides 20A, 20B, 20C, and 20D (see FIG. 3).
- the semiconductor substrate 32 includes a first surface 32A (top surface in FIGS. 5 and 6) and a second surface 32B (bottom surface in FIGS. 5 and 6) opposite to the first surface 32A.
- the semiconductor layer 34 is provided on the first surface 32A of the semiconductor substrate 32 .
- the semiconductor layer 34 includes a first surface 34A (top surface in FIGS. 5 and 6) and a second surface 34B (bottom surface in FIGS. 5 and 6) opposite to the first surface 34A. 5 and 6, the second surface 34B of the semiconductor layer 34 is in contact with the first surface 32A of the semiconductor substrate 32.
- the second surface 34B of the semiconductor layer 34 is formed so as to cover the entire surface of the first surface 32A of the semiconductor substrate 32, for example.
- the semiconductor layer 34 can be formed by, for example, a Si epitaxial layer.
- the insulating layer 36 is provided on the first surface 34A of the semiconductor layer 34 .
- insulating layer 36 is shown as a single layer, but may include multiple layers.
- insulating layer 36 may include at least one of a silicon oxide (SiO 2 ) layer and a silicon nitride (SiN) layer.
- the insulating layer 36 has a two-layer structure of a USG (Undoped Silicate Glass) layer containing no impurities and a BPSG (Boron-Phosphorus Silicate Glass) layer covering the USG layer and containing impurities of boron and phosphorus. may be
- the insulating layer 36 is also called an inter-layer dielectric (ILD).
- ILD inter-layer dielectric
- the semiconductor device 20 includes a source electrode layer 40, a drain electrode layer 50, a gate electrode layer 60, and a passivation layer .
- the source electrode layer 40 and the gate electrode layer 60 are provided on the insulating layer 36 .
- the drain electrode layer 50 is provided on the second surface 32B of the semiconductor substrate 32 .
- the drain electrode layer 50 may be formed to cover the entire second surface 32B of the semiconductor substrate 32 .
- the passivation layer 70 covers the source electrode layer 40 and the gate electrode layer 60 .
- the passivation layer 70 has the same shape as the semiconductor substrate 32 (semiconductor element 20) in plan view.
- Passivation layer 70 is formed to partially expose source electrode layer 40 and partially expose gate electrode layer 60 .
- the source electrode layer 40 is indicated by hatching with diagonal lines rising to the right
- the gate electrode layer 60 is indicated by hatching with diagonal lines rising to the left.
- Portions of the source electrode layer 40 and the gate electrode layer 60 exposed from the passivation layer 70 are indicated by solid lines, and portions of the source electrode layer 40 and the gate electrode layer 60 covered by the passivation layer 70 are indicated by broken lines.
- the source electrode layer 40 may include source electrode portions 42 , source fingers 44 and connecting portions 46 .
- Source finger 44 is connected to source electrode portion 42 by connection 46 .
- the source electrode portion 42 and the source finger 44 are integrally formed continuously with the connection portion 46 .
- the source electrode portion 42 may be formed to cover the active region of the semiconductor element 20 .
- the source electrode portion 42 has, for example, a substantially L shape in plan view.
- the active region is a semiconductor element region in which transistor structures that contribute to the operation of the transistor (semiconductor element 20) are mainly arranged, but the entire active region need not have a transistor structure.
- a structure other than the transistor structure may be placed in part of the active area, or part of the transistor structure may be placed outside the active area.
- the source electrode portion 42 includes a source pad 42A and a source pad peripheral portion 42B located around the source pad 42A and forming the outer peripheral portion of the source electrode portion 42.
- the source pad peripheral portion 42B is formed continuously and integrally with the source pad 42A.
- the source electrode portion 42 corresponds to the first wiring portion.
- Source pad 42A corresponds to a connection region.
- the source pad 42A has, for example, a substantially L-shape in plan view, and has a size one size smaller than the source electrode portion 42 .
- Passivation layer 70 includes a source pad opening 72 that exposes source pad 42A of source electrode portion 42 .
- Source pad opening 72 corresponds to the first opening.
- the first end portion 22F (see FIG. 1) of the first conductive member 22 described above is joined to the source pad 42A exposed from the source pad opening 72. Therefore, the source pad 42A (source pad opening 72) is formed to have the same size as or slightly larger than the first end portion 22F of the first conductive member 22 in plan view.
- the passivation layer 70 includes a source electrode exposing slit 74 that exposes a portion of the source pad peripheral portion 42B.
- the source electrode exposure slit 74 corresponds to the first slit.
- the source electrode exposure slit 74 can be formed in a ring shape in a portion of the passivation layer 70 that overlaps the source pad peripheral portion 42B in plan view. In the example of FIG. 3, the source electrode exposure slit 74 is formed in a closed annular shape. Therefore, the source electrode exposure slit 74 is formed over the entire circumference of the source pad peripheral portion 42B (peripheral portion of the source electrode portion 42). That is, the source electrode exposure slit 74 exposes a portion of the source pad peripheral portion 42B over the entire circumference of the source pad peripheral portion 42B.
- annular as used in this disclosure includes not only any structure that forms a continuous shape without ends, i.e., a loop, but also generally a loop that has discontinuities (gaps), such as a C-shape. Also refers to the structure of shape.
- the explicit reference to a "closed loop” refers to any structure that forms a continuous shape or loop without ends, whereas the explicit reference to an “open loop” generally refers to a loop with discontinuities.
- Such “annular” shapes can include not only ellipses, but any shape that includes multiple corners with square or rounded corners.
- the gate electrode layer 60 is spaced apart from the source electrode portion 42 and is provided so as to at least partially surround the source electrode portion 42 .
- the gate electrode layer 60 corresponds to the second wiring portion.
- a separation region 48 is formed between the gate electrode layer 60 and the source electrode layer 40 .
- the spacing region 48 can be formed in an annular shape (closed annular shape) surrounding the entire circumference of the gate electrode layer 60 in plan view. No electrode layer is formed in this spaced region 48, and a passivation layer 70 at least partially penetrates it (see FIG. 6). Therefore, the gate electrode layer 60 and the source electrode layer 40 are insulated from each other by the passivation layer 70 . Note that the distance between the gate electrode layer 60 and the source electrode layer 40 can be appropriately determined in consideration of, for example, the breakdown voltage.
- the gate electrode layer 60 may include gate electrode portions 62 and gate fingers 64 .
- the gate electrode portion 62 has a rectangular shape in plan view. Gate fingers 64 are spaced apart from source electrode portion 42 and extend along source electrode portion 42 . Gate fingers 64 extend from gate electrode portion 62 so as to annularly surround source electrode portion 42 .
- gate finger 64 includes first and second gate finger portions 64A, 64B extending from gate electrode portion 62. In the example of FIG. The first and second gate finger portions 64A and 64B are formed continuously and integrally with the gate electrode portion 62 .
- the gate electrode portion 62 includes a gate pad 62A.
- the gate pad 62A has a rectangular shape in plan view.
- the gate pad 62A has a size one size smaller than that of the gate electrode portion 62 .
- Passivation layer 70 includes a gate pad opening 76 that exposes gate pad 62A of gate electrode portion 62 .
- the first end portion 24F (see FIG. 1) of the second conductive member 24 described above is joined to the gate pad 62A exposed from the gate pad opening 76. Therefore, the gate pad 62A (gate pad opening 76) is formed to have the same size as or slightly larger than the first end portion 24F of the second conductive member 24 in plan view.
- gate electrode layer 60 is formed in an open annular shape.
- the first gate finger portion 64A includes a first portion 64A1 linearly extending from the gate electrode portion 62 along the first side 20A (the left side in FIG. 3) and a third side 20C. and a second portion 64A2 linearly extending from the first portion 64A1 along (the upper side in FIG. 3). Therefore, the first gate finger portion 64A has an L shape in plan view.
- the second gate finger portion 64B includes a first portion 64B1 linearly extending from the gate electrode portion 62 along the fourth side 20D (lower side in FIG. 3) and a second side 20B (right side in FIG. 3). and a second portion 64B2 extending linearly from the first portion 64B1 along the . Therefore, the second gate finger portion 64B has an L shape in plan view.
- the tip of the second portion 64A2 of the first gate finger portion 64A faces the tip of the second portion 64B2 of the second gate finger portion 64B across an open region corresponding to the connecting portion 46 of the source electrode layer 40. . Therefore, the first gate finger portion 64A, the gate electrode portion 62, and the second gate finger portion 64B are continuously formed in an annular shape, but the gate electrode layer 60 as a whole is formed in an open annular shape. .
- the passivation layer 70 includes a first gate finger exposing slit 78A that exposes a portion of the first gate finger portion 64A and a second gate finger exposing slit 78B that exposes a portion of the second gate finger portion 64B.
- First and second gate finger exposure slits 78A, 78B each correspond to a second slit.
- the first gate finger exposing slit 78A can be formed in an L shape in the portion of the passivation layer 70 that overlaps the first gate finger portion 64A in plan view.
- the first gate finger exposing slit 78A includes a first slit portion 78A1 extending linearly over the first portion 64A1 of the first gate finger portion 64A and a second slit portion 78A1 of the first gate finger portion 64A. and a second slit portion 78A2 extending linearly over the portion 64A2.
- the first slit portion 78A1 exposes the vicinity of the center of the first portion 64A1 of the first gate finger portion 64A over the entire length of the first portion 64A1.
- the second slit portion 78A2 exposes the vicinity of the center of the second portion 64A2 of the first gate finger portion 64A over the entire length of the second portion 64A2.
- the first slit portion 78A1 is continuous with the second slit portion 78A2.
- a connection portion between the first slit portion 78A1 and the second slit portion 78A2 is positioned on a corner portion of the first gate finger portion 64A.
- the first gate finger exposing slit 78A is formed in an L shape by the first slit portion 78A1 and the second slit portion 78A2, like the first gate finger portion 64A.
- total length is not only when it is exactly equal to the length from one end of the member to the other, but also slightly less than the length from one end of the member to the other (i.e. substantially the same).
- the second gate finger exposing slit 78B can be formed in an L shape in the portion of the passivation layer 70 that overlaps the second gate finger portion 64B in plan view.
- the second gate finger exposing slit 78B includes a first slit portion 78B1 extending linearly over the first portion 64B1 of the second gate finger portion 64B and a second slit portion 78B1 of the second gate finger portion 64B. and a second slit portion 78B2 extending linearly over the portion 64B2.
- the first slit portion 78B1 exposes the vicinity of the center of the first portion 64B1 of the second gate finger portion 64B over the entire length of the first portion 64B1.
- the second slit portion 78B2 exposes the vicinity of the center of the second portion 64B2 of the second gate finger portion 64B over the entire length of the second portion 64B2.
- the first slit portion 78B1 is continuous with the second slit portion 78B2.
- a connection portion between the first slit portion 78B1 and the second slit portion 78B2 is positioned on a corner portion of the second gate finger portion 64B.
- the first slit portion 78B1 and the second slit portion 78B2 form the second gate finger exposing slit 78B in an L shape like the second gate finger portion 64B.
- the source fingers 44 are spaced apart from the gate electrode layer 60 via the spacing regions 48 described above and at least partially surround the gate electrode layer 60 .
- the source finger 44 corresponds to the third wiring portion.
- the source fingers 44 are formed in a closed loop surrounding the periphery of the gate electrode layer 60 .
- Source finger 44 is connected to connection 46 of source electrode layer 40 .
- the source finger 44 includes four portions forming a closed loop, first through fourth portions 44A, 44B, 44C, 44D.
- the first portion 44A of the source finger 44 extends linearly along the first side 20A (the left side in FIG. 3), that is, along the gate electrode portion 62 and the first portion 64A1 of the first gate finger portion 64A. are doing.
- the second portion 44B of the source finger 44 extends linearly along the third side 20C (upper side in FIG. 3), that is, along the second portion 64A2 of the first gate finger portion 64A.
- the third portion 44C of the source finger 44 extends linearly along the fourth side 20D (lower side in FIG. 3), that is, along the first portion 64B1 of the second gate finger portion 64B.
- the fourth portion 44D of the source finger 44 is straight along the second side 20B (the right side in FIG. 3), that is, along the second portion 64B2 of the second gate finger portion 64B and the connection portion 46 of the source electrode layer 40. extending in the shape of
- the fourth portion 44D of the source finger 44 is formed continuously and integrally with the connection portion 46 of the source electrode layer 40. As shown in FIG. Also, the first to fourth portions 44A, 44B, 44C, 44D of the source finger 44 are integrally formed continuously. Therefore, the source finger 44 is formed in a closed ring shape by the first to fourth portions 44A, 44B, 44C, 44D.
- Passivation layer 70 includes source finger exposure slits 79 that expose portions of source fingers 44 .
- Source finger exposure slit 79 corresponds to the third slit.
- the source finger exposing slit 79 may be formed in a ring shape in the portion of the passivation layer 70 that overlaps the source finger 44 in plan view.
- the source finger exposing slits 79 are formed in a closed annular shape. Therefore, the source finger exposing slits 79 are formed all around the source fingers 44 . That is, the source finger exposing slit 79 exposes a portion of the source finger 44 over the entire circumference of the source finger 44 .
- the source finger exposing slit 79 includes four slit portions forming a closed loop, namely first through fourth slit portions 79A, 79B, 79C and 79D.
- the first slit portion 79A extends linearly over the first portion 44A of the source finger 44.
- the second through fourth slit portions 79B, 79C, 79D extend linearly over the second through fourth portions 44B, 44C, 44D of the source finger 44, respectively.
- the first slit portion 79A exposes the vicinity of the center of the first portion 44A of the source finger 44 over the entire length of the first portion 44A.
- the second to fourth slit portions 79B, 79C, 79D extend over the entire length of the second to fourth portions 44B, 44C, 44D of the source finger 44. The center of each is exposed.
- the first to fourth slit portions 79A, 79B, 79C, 79D of the source finger exposing slits 79 are continuous with each other.
- the connecting portions of the slit portions 79C and 79D are located on the four corners of the source fingers 44.
- FIG. In this manner, the source finger exposing slits 79 are formed in a closed annular shape like the source fingers 44 by the first to fourth slit portions 79A, 79B, 79C, and 79D.
- the semiconductor substrate 32 provided with the drain electrode layer 50 functions as the drain region of the transistor (MISFET).
- Semiconductor layer 34 includes a drift region 82 formed over semiconductor substrate (drain region) 32 , a body region 84 formed over drift region 82 , and a source region 86 formed over body region 84 .
- the semiconductor substrate 32 corresponding to the drain region is formed as an n-type region containing n-type impurities.
- the drift region 82 is formed as an n-type region containing an n-type impurity concentration lower than that of the semiconductor substrate (drain region) 32 .
- Body region 84 is formed as a p-type region containing p-type impurities.
- Source region 86 is formed as an n-type region containing a higher concentration of n-type impurities than drift region 82 .
- n-type impurities include phosphorus (P) and arsenic (As).
- Examples of p-type impurities include boron (B) and aluminum (Al).
- the semiconductor device 20 may include a plurality of gate trenches 90 formed in the first surface 34A of the semiconductor layer 34. As shown in FIG. At least some of the plurality of gate trenches 90 may be arranged parallel to each other at regular intervals. In the example of FIG. 4, the plurality of gate trenches 90 are equally spaced from each other in the first direction (Y direction) along the first portions 64A1 of the first gate finger portions 64A and the first portions 44A of the source fingers 44. arranged in parallel. The plurality of gate trenches 90 extend in the second direction (X direction) from the source electrode portion 42 to the first portions 44A of the source fingers 44 in plan view, and extend from the first portions 64A1 of the first gate finger portions 64A. crossed.
- FIG. 4 shows only the portion of the semiconductor element 20 surrounded by the two-dot chain line F4 in FIG. Multiple gate trenches may be formed as well.
- some of the gate trenches are evenly spaced from each other in the second direction (the X direction) along the second portion 64A2 of the first gate finger portion 64A and the second portion 44B of the source finger 44. can be arranged in parallel. These gate trenches extend in the first direction (Y direction) from the source electrode portion 42 to the second portions 44B of the source fingers 44 in plan view, and intersect the second portions 64A2 of the first gate finger portions 64A. .
- gate trenches are arranged parallel to each other at regular intervals in the second direction (X direction) along the first portion 64B1 of the second gate finger portion 64B and the third portion 44C of the source finger 44. obtain. These gate trenches extend in the first direction (Y direction) from the source electrode portion 42 to the third portions 44C of the source fingers 44 in plan view, and intersect the first portions 64B1 of the second gate finger portions 64B. .
- gate trenches are arranged parallel to each other at equal intervals in the first direction (Y direction) along the second portion 64B2 of the second gate finger portion 64B and the fourth portion 44D of the source finger 44. obtain. These gate trenches extend in the second direction (X direction) from the source electrode portion 42 to the fourth portion 44D of the source finger 44 in plan view, and intersect the second portion 64B2 of the second gate finger portion 64B. .
- the semiconductor device 20 may include a peripheral trench 92 formed in the first surface 34A of the semiconductor layer 34.
- Peripheral trench 92 communicates with multiple gate trenches 90 .
- the peripheral trench 92 includes a first peripheral trench portion 92A formed at a position overlapping the source finger 44 in plan view and extending in the first direction (Y direction).
- the peripheral trench 92 includes a second peripheral trench portion 92B formed at a position overlapping the source electrode portion 42 in plan view and extending in the first direction (Y direction).
- the first and second peripheral trench portions 92A, 92B communicate with the gate trench 90.
- the peripheral trench 92 may be formed so as to surround the plurality of gate trenches 90 in plan view.
- each gate trench 90 has a field plate electrode 94, a buried gate electrode 96, and a trench insulating layer 98 arranged therein. It should be noted that although one gate trench 90 and related structures are described below, the following description can be similarly applied to other gate trenches 90 and related structures.
- the field plate electrode 94 and the buried gate electrode 96 are separated from each other by a trench insulating layer 98.
- FIG. Trench insulating layer 98 covers sidewalls 90A and bottom wall 90B of gate trench 90 and fills gate trench 90 .
- the peripheral trench 92 is also filled with the trench insulating layer 98 .
- the buried gate electrode 96 is arranged above the field plate electrode 94 within the gate trench 90 .
- Such a structure in which two separated electrodes (the field plate electrode 94 and the buried gate electrode 96) are buried in the gate trench 90 can be called a split gate structure.
- semiconductor device 20 since semiconductor device 20 includes a plurality of gate trenches 90 , it may include as many field plate electrodes 94 as gate trenches 90 and as many buried gate electrodes 96 as gate trenches 90 .
- Field plate electrode 94 and buried gate electrode 96 may be formed of conductive polysilicon, for example.
- the trench insulation layer 98 may be formed by SiO2 , for example.
- a trench insulating layer 98 surrounds the field plate electrode 94 .
- the trench insulating layer 98 is interposed between the embedded gate electrode 96 and the semiconductor layer 34 .
- the buried gate electrode 96 and the semiconductor layer 34 are separated from each other (in the Y direction in FIG. 5) by the trench insulating layer 98 .
- a predetermined voltage is applied to the embedded gate electrode 96, a channel is formed in the body region 84 (p-type region). This channel allows control of electron flow (in the Z direction in FIG. 5) between source region 86 (n-type region) and drift region 82 (n-type region).
- the insulating layer 36 formed on the first surface 34A of the semiconductor layer 34 covers the embedded gate electrode 96 embedded in the gate trench 90 and the trench insulating layer 98 .
- a contact trench 37 is formed in the insulating layer 36 .
- Contact trench 37 penetrates insulating layer 36 and source region 86 to reach body region 84 .
- a contact region 38 is formed at the bottom of the contact trench 37 .
- contact region 38 is formed as a p-type region containing a higher concentration of p-type impurities than body region 84 .
- the contact trenches 37 are filled with source contacts 39 .
- the contact trench 37 and the source contact 39 filled therein can extend parallel to the gate trench 90 (in the X direction in FIG. 4) in plan view.
- Each gate trench 90 is positioned between two adjacent source contacts 39 in plan view.
- the source contact 39 is connected to a source electrode portion 42 (source electrode layer 40) formed on the insulating layer 36.
- contact region 38 is electrically connected to source electrode portion 42 via source contact 39 .
- the buried gate electrode 96 can be connected to the first gate finger portion 64A (gate electrode layer 60) by a gate contact 102 formed in the insulating layer 36.
- Gate contact 102 is filled in a contact via 104 through insulating layer 36 .
- the contact via 104 and the gate contact 102 filled therein are provided at positions overlapping the first gate finger portion 64A (the first portion 64A1 in the example of FIG. 4) in plan view. there is That is, the buried gate electrode 96 in each gate trench 90 extends so as to intersect the first gate finger portion 64A in plan view (in the X direction in FIG. 4), and the gate contact 102 is located at the intersecting position. is electrically connected to the first gate finger portion 64A by (see FIG. 6).
- field plate electrode 94 is formed by first field plate contact 106A formed in insulating layer 36 and first conductive member 110A provided immediately below source finger 44 (source electrode layer 40). ). Also, the field plate electrode 94 can be connected to the source electrode portion 42 (source electrode layer 40) by the second field plate contact 106B formed in the insulating layer 36 and the second conductive member 110B provided directly thereunder. . First and second field plate contacts 106A, 106B are filled in first and second contact trenches 108A, 108B through insulating layer 36, respectively. For example, a first conductive member 110A is provided within a first peripheral trench portion 92A and a second conductive member 110B is provided within a second peripheral trench portion 92B. The first and second conductive members 110A, 110B may be formed of conductive polysilicon, for example.
- the first contact trench 108A and the first field plate contact 106A filled therein are, in plan view, the source finger 44 (the first portion 44A in the example of FIG. 4) and the first peripheral trench. It is provided at a position overlapping with the portion 92A.
- These first contact trenches 108A and first field plate contacts 106A extend along the first peripheral trench portion 92A (in the Y direction in FIG. 4).
- the first conductive member 110A extends, for example, along the first field plate contact 106A into the first peripheral trench portion 92A (in the Y direction in FIG. 4).
- the first conductive member 110A is connected to field plate electrodes 94 in the plurality of gate trenches 90 communicating with the first peripheral trench portion 92A.
- the plurality of field plate electrodes 94 are electrically connected to source fingers 44 (source electrode layer 40) by first conductive members 110A and first field plate contacts 106A (see FIG. 6).
- the second contact trench 108B and the second field plate contact 106B filled therein are provided at positions overlapping the source electrode portion 42 and the second peripheral trench portion 92B in plan view. These second contact trenches 108B and second field plate contacts 106B extend along the second peripheral trench portion 92B (in the Y direction in FIG. 4). Although not shown in detail, the second conductive member 110B extends, for example, along the second field plate contact 106B into the second peripheral trench portion 92B (in the Y direction in FIG. 4). The second conductive member 110B is connected to field plate electrodes 94 in the plurality of gate trenches 90 communicating with the second peripheral trench portion 92B. Therefore, the plurality of field plate electrodes 94 are electrically connected to the source electrode section 42 (source electrode layer 40) by the second conductive members 110B and the second field plate contacts 106B (see FIG. 6).
- one end of the field plate electrode 94 is connected to the source finger 44 (source electrode layer 40), and the other end of the field plate electrode 94 is connected to the source electrode portion 42 (source electrode layer 40). Therefore, both ends of each field plate electrode 94 are connected to the source electrode layer 40 .
- This configuration provides an advantage over field plate electrodes 94 compared to, for example, configurations in which only one end of each field plate electrode 94 is connected to source electrode layer 40 (eg, a configuration in which source electrode layer 40 does not include source fingers 44). resistance can be reduced.
- the transistor operation can be stabilized by suppressing the potential rise of field plate electrode 94 during transistor operation.
- the passivation layer 70 covers the source electrode layer 40 and the gate electrode layer 60 .
- the annular (closed annular in the example of FIG. 3) separation region 48 is formed between the source electrode layer 40 and the gate electrode layer 60 .
- a passivation layer 70 is also formed on the insulating layer 36 by partially entering the spacing region 48 . Therefore, the passivation layer 70 is formed on the first surface (upper surface in FIG. 7) and second surface (side surface in FIG. 7) of the source electrode layer 40 and the first surface (upper surface in FIG. 7) and second surface of the gate electrode layer 60 . It covers the surface (side surface in FIG. 7).
- the first surface of the source electrode layer 40 is the surface of the source electrode layer 40 exposed by the source pad openings 72 of the passivation layer 70, the source electrode exposure slits 74, and the source finger exposure slits 79 (see FIG. 3).
- the second surface of the source electrode layer 40 is defined as the surface of the source electrode layer 40 that is continuous with the first surface of the source electrode layer 40 and defines the separation region 48 .
- the first surface of the source electrode layer 40 will be referred to as the top surface of the source electrode layer 40 and the second surface of the source electrode layer 40 will be referred to as the side surface of the source electrode layer 40 .
- the first surface of gate electrode layer 60 is exposed by gate pad opening 76 (see FIG. 3) in passivation layer 70, first gate finger exposure slit 78A, and second gate finger exposure slit 78B (see FIG. 3). is defined as the plane of the gate electrode layer 60 that is exposed.
- the second surface of gate electrode layer 60 is defined as the surface of gate electrode layer 60 that is continuous with the first surface of gate electrode layer 60 and defines separation region 48 .
- the first surface of the gate electrode layer 60 will be referred to as the top surface of the gate electrode layer 60 and the second surface of the gate electrode layer 60 will be referred to as the side surface of the gate electrode layer 60 .
- the source electrode layer 40 and the gate electrode layer 60 can be formed with a thickness T1. That is, the source electrode layer 40 and the gate electrode layer 60 may have the same thickness. However, the source electrode layer 40 and the gate electrode layer 60 may have different thicknesses.
- Passivation layer 70 may be formed with a thickness T ⁇ b>2 that is smaller than thickness T ⁇ b>1 of source electrode layer 40 and thickness T ⁇ b>1 of gate electrode layer 60 .
- the thickness T2 may be, for example, less than or equal to half the thickness T1. In one example, the thickness T1 of the source electrode layer 40 and the gate electrode layer 60 is approximately 4.2 ⁇ m, and the thickness T2 of the passivation layer 70 is approximately 1.6 ⁇ m.
- the passivation layer 70 includes a first covering portion 71A covering the upper surface of the source electrode layer 40 and the upper surface of the gate electrode layer 60, and a second covering portion 71A positioned in the separation region 48 and covering the side surfaces of the source electrode layer 40 and the side surface of the gate electrode layer 60. 2 cover portion 71B. Passivation layer 70 also includes a third covering portion 71 ⁇ /b>C located in spacing region 48 and located on insulating layer 36 .
- steps are generated between the source pad peripheral portion 42B (that is, the source electrode portion 42) and the first gate finger portion 64A and between the source finger 44 and the first gate finger portion 64A. ing. Although not shown, there are also steps between the source pad peripheral portion 42B and the second gate finger portion 64B and between the source pad peripheral portion 42B and the gate electrode portion 62 . Although not shown, there are also steps between the source finger 44 and the second gate finger portion 64B and between the source finger 44 and the gate electrode portion 62 .
- the passivation layer 70 is formed stepwise at the position of the separation region 48 . That is, the passivation layer 70 covers the first covering portion 71A covering the upper surface of the source electrode layer 40 and the upper surface of the gate electrode layer 60, and the side surface of the source electrode layer 40 and the side surface of the gate electrode layer 60 located in the separation region 48. It includes a step formed by the second covering portion 71B.
- the third covering portion 71 ⁇ /b>C connects the second covering portion 71 ⁇ /b>B covering the side surface of the source electrode layer 40 and the second covering portion 71 ⁇ /b>B covering the side surface of the gate electrode layer 60 .
- the first covering portion 71A may have the same thickness (that is, thickness T2) as the third covering portion 71C. However, in the spacing region 48, the third covering portion 71C may be thicker than the first covering portion 71A.
- a gap 80 may exist between the second covering portion 71B covering the side surface of the source electrode layer 40 and the second covering portion 71B covering the side surface of the gate electrode layer 60 . Although the size (width) of the gap 80 is exaggerated in FIG. Alternatively, this gap 80 may be substantially filled within the spacing region 48 .
- a source pad opening 72, a source electrode exposure slit 74, and a source finger exposure slit 79 of the passivation layer 70 are formed in the first covering portion 71A.
- a gate pad opening 76 (see FIG. 3) in passivation layer 70, a first gate finger exposure slit 78A, and a second gate finger exposure slit 78B (see FIG. 3) are also formed in first covering portion 71A.
- the source electrode exposure slit 74 has a slit width W1
- the first and second gate finger exposure slits 78A and 78B have a slit width W2
- the source finger exposure slit 79 has a slit width W3.
- These slit widths W1, W2 and W3 may have the same value.
- the slit widths W1, W2, and W3 may have different values.
- the slit width W2 of each of the first and second gate finger exposing slits 78A and 78B may be smaller (or larger) than the slit width W1 of the source electrode exposing slit 74.
- the slit width W3 of the source finger exposing slits 79 may be smaller (or larger) than the slit width W1 of the source electrode exposing slits 74 .
- gate trench 90 extends from source electrode portion 42 to source finger 44 in either a first direction (Y direction) or a second direction (X direction). crosses the first gate finger portion 64A or the second gate finger portion 64B.
- Each embedded gate electrode 96 extends within the gate trench 90 from the source electrode portion 42 to the first gate finger portion 64A (see FIG. 6, for example) or the second gate finger portion 64B.
- Each field plate electrode 94 extends from a position overlapping the source finger 44 in plan view (first conductive member 110A) to a position overlapping the source electrode portion 42 in plan view (second conductive member 110B). extended.
- the source electrode exposure slits 74, the first gate finger exposure slits 78A, the second gate finger exposure slits 78B (see FIG. 3), and the source finger exposure slits 79 overlap the active region (semiconductor element region) in plan view. are placed in
- Semiconductor device 20 includes a passivation layer 70 covering source electrode layer 40 and gate electrode layer 60 .
- Source electrode layer 40 includes source electrode portion 42 and source fingers 44 .
- Gate electrode layer 60 includes gate electrode portion 62 and gate fingers 64 .
- Gate fingers 64 at least partially surround source electrode portion 42 .
- Source fingers 44 at least partially surround gate electrode layer 60 .
- the passivation layer 70 includes a source pad opening 72 that exposes the source pad 42A of the source electrode portion 42.
- the first conductive member 22 is connected to the source pad 42A. In this configuration, passivation layer 70 is stressed by the force applied to passivation layer 70 from first conductive member 22 in contact with the edge of source pad opening 72 .
- the passivation layer 70 includes source electrode exposure slits 74 that expose a portion of the source pad peripheral portion 42B. Therefore, the stress applied to the passivation layer 70 from the first conductive member 22 connected to the source pad 42A, especially the stress applied to the portion of the passivation layer 70 on the source pad peripheral portion 42B can be relieved by the source electrode exposure slit 74. . Thereby, generation of passivation cracks can be suppressed.
- the source electrode exposure slit 74 is formed in an annular (closed annular) shape. Thereby, the stress applied to the passivation layer 70 can be effectively relieved over the entire circumference of the source pad peripheral portion 42B.
- the passivation layer 70 also includes first and second gate finger exposure slits 78A, 78B that expose portions of the gate fingers 64 (first and second gate finger portions 64A, 64B). Therefore, the stress on the passivation layer 70 from the first conductive member 22 connected to the source pad 42A, especially the stress on the portion of the passivation layer 70 over the gate finger 64, is removed by the first and second gate finger exposure slits 78A, 78B. can be mitigated. Thereby, generation of passivation cracks can be suppressed.
- first and second gate finger exposure slits 78A, 78B are formed over the entire length of the first and second gate finger portions 64A, 64B. Thereby, the stress applied to the passivation layer 70 over the entire length of the first and second gate finger portions 64A, 64B can be effectively relaxed.
- passivation layer 70 includes source finger exposing slits 79 that expose portions of source fingers 44 . Therefore, the stress applied to the passivation layer 70 from the first conductive member 22 connected to the source pad 42A, especially the stress applied to the portion of the passivation layer 70 above the source finger 44 can be relieved by the source finger exposure slit 79. Thereby, generation of passivation cracks can be suppressed.
- the source finger exposing slit 79 is formed in an annular (closed annular) shape. That is, the source finger exposure slits 79 are formed over the entire length of the source fingers 44 . Thereby, the stress applied to the passivation layer 70 can be effectively relieved over the entire circumference of the source finger 44 .
- passivation layer 70 includes source electrode exposure slits 74, first and second gate finger exposure slits 78A and 78B, and source finger exposure slits 79 near stepped spacing region 48. FIG. Thereby, the stress applied to the passivation layer 70 can be relaxed, and the occurrence of passivation cracks can be suppressed.
- the source electrode exposure slits 74, the first and second gate finger exposure slits 78A and 78B, and the source finger exposure slits 79 are arranged at positions overlapping the semiconductor element region contributing to the operation of the semiconductor element 20 in plan view. there is Therefore, the reliability of the semiconductor element 20 can be improved by suppressing the occurrence of cracks in the portion of the passivation layer 70 that overlaps the semiconductor element region in plan view.
- the passivation layer 70 includes a source electrode exposure slit 74 that exposes a portion of the source pad peripheral portion 42B (peripheral portion of the source electrode portion 42). Therefore, the stress applied to the passivation layer 70 from the first conductive member 22 connected to the source pad 42A, especially the stress applied to the portion of the passivation layer 70 on the source pad peripheral portion 42B is relieved by the source electrode exposure slit 74. Thereby, generation of passivation cracks can be suppressed.
- the passivation layer 70 further includes first and second gate finger exposing slits 78A, 78B that expose portions of the gate fingers 64 (first and second gate finger portions 64A, 64B). Gate fingers 64 are arranged to surround source electrode portion 42 . Therefore, the stress on passivation layer 70 from first conductive member 22, particularly the portion of passivation layer 70 over gate finger 64, is further relieved by first and second gate finger exposure slits 78A, 78B. As a result, by forming the source electrode exposure slit 74 and the first and second gate finger exposure slits 78A and 78B, the occurrence of passivation cracks can be further suppressed.
- the passivation layer 70 further includes source finger exposing slits 79 that expose portions of the source fingers 44 .
- Source fingers 44 are arranged to surround gate fingers 64 (gate electrode layer 60). Therefore, the stress on the passivation layer 70 from the first conductive member 22 , especially the stress on the portion of the passivation layer 70 over the source finger 44 , is further relieved by the source finger exposure slit 79 .
- the source electrode exposure slits 74, the first and second gate finger exposure slits 78A and 78B, and the source finger exposure slits 79 the generation of passivation cracks can be further suppressed.
- the thickness T2 of the passivation layer 70 is smaller than the thickness T1 of the source electrode layer 40 and the thickness T1 of the gate electrode layer 60 . That is, passivation layer 70 is thinner than source electrode layer 40 and gate electrode layer 60 . Thereby, an increase in stress generated in the passivation layer 70 can be suppressed, and the occurrence of passivation cracks can be suppressed.
- the passivation layer 70 at least partially enters the separation region 48 between the source electrode layer 40 and the gate electrode layer 60 and is formed stepwise at the position of the separation region 48 . Therefore, passivation layer 70 covering source electrode layer 40 and gate electrode layer 60 is not flat.
- passivation layer 70 includes source electrode exposure slits 74, first and second gate finger exposure slits 78A and 78B, and source finger exposure slits 79 near stepped spacing region 48. FIG. Thereby, the stress applied to the passivation layer 70 can be relaxed, and the occurrence of passivation cracks can be suppressed.
- the passivation layer 70 includes a first covering portion 71A covering the upper surface of the source electrode layer 40 and the upper surface of the gate electrode layer 60 .
- Passivation layer 70 also includes a second covering portion 71B that covers the side surface of source electrode layer 40 and the side surface of gate electrode layer 60 at spaced region 48 .
- the step of passivation layer 70 is formed by first covering portion 71A and second covering portion 71B.
- Source electrode exposure slits 74, first and second gate finger exposure slits 78A and 78B, and source finger exposure slits 79 are formed in first covering portion 71A (ie, the top surface of passivation layer 70) including source pad opening 72. ing.
- the stress applied from the first conductive member 22 connected to the source pad 42A to the first covering portion 71A of the passivation layer 70 can be alleviated, and the occurrence of cracks in the first covering portion 71A can be suppressed.
- the source pad peripheral portion 42B (source electrode portion 42) has an outer shape including corners in plan view (in the example of FIG. 3, a substantially L shape in plan view). Stress is relatively likely to concentrate on the portion of the passivation layer 70 corresponding to the corner of the source pad peripheral portion 42B. Therefore, the stress applied to the passivation layer 70 on the corners of the source pad peripheral portion 42B can be relieved by the source electrode exposure slits 74, thereby suppressing the generation of passivation cracks.
- the source electrode exposure slit 74 is formed in an annular shape. As a result, stress applied to the passivation layer 70 on the outer periphery of the source pad peripheral portion 42B can be alleviated by the source electrode exposure slits 74, thereby suppressing the occurrence of passivation cracks.
- the source electrode exposure slit 74 is formed in a closed annular shape. As a result, stress applied to the passivation layer 70 on the entire outer periphery of the source pad peripheral portion 42B can be alleviated by the source electrode exposure slits 74, thereby suppressing the occurrence of passivation cracks.
- Gate fingers 64 (first and second gate finger portions 64A, 64B) include corners.
- the portions of passivation layer 70 corresponding to the corners of gate fingers 64 are relatively prone to stress concentrations. Therefore, the stress applied to the passivation layer 70 on the corners of the gate fingers 64 can be relieved by the first and second gate finger exposure slits 78A, 78B, thereby suppressing the occurrence of passivation cracks.
- the gate electrode layer 60 includes a gate electrode portion 62, and gate fingers 64 (first and second gate finger portions 64A and 64B) are arranged to annularly surround the source electrode portion 42. Extends from 62. First and second gate finger exposing slits 78A, 78B are located on gate finger 64 along the entire length of gate finger 64 (first and second gate finger portions 64A, 64B). As a result, the stress applied to the passivation layer 70 over the entire length of the gate fingers 64 annularly surrounding the source electrode portion 42 is relieved by the first and second gate finger exposure slits 78A and 78B, thereby suppressing the occurrence of passivation cracks. can do.
- Source fingers 44 include corners. Stress is relatively likely to concentrate on the portions of passivation layer 70 corresponding to the corners of source fingers 44 . Therefore, stress applied to the passivation layer 70 on the corners of the source fingers 44 can be relieved by the source finger exposure slits 79 to suppress the occurrence of passivation cracks.
- the source finger exposing slit 79 is formed in an annular shape. As a result, stress applied to the passivation layer 70 on the source fingers 44 can be alleviated by the source finger exposure slits 79, thereby suppressing the occurrence of passivation cracks.
- the source finger exposing slit 79 is formed in a closed annular shape. As a result, stress applied to the passivation layer 70 on the entire circumference of the source finger 44 can be alleviated by the source finger exposure slit 79, thereby suppressing the occurrence of passivation cracks.
- the slit width W1 of the source electrode exposing slit 74 is the same as the slit width W2 of the first and second gate finger exposing slits 78A and 78B. That is, the source electrode exposing slit 74 exposing the source pad peripheral portion 42B is formed with the same width as the first and second gate finger exposing slits 78A and 78B exposing the gate finger 64. As shown in FIG.
- the slit width W1 is the same as the slit width W3 of the source finger exposing slits 79, and the source electrode exposing slits 74 are formed with the same width as the source finger exposing slits 79 that expose the source fingers 44.
- the semiconductor element 20 is a transistor having a split gate structure formed in a semiconductor element region (active region).
- the source electrode exposure slits 74, the first and second gate finger exposure slits 78A and 78B, and the source finger exposure slits 79 are arranged at positions that overlap the semiconductor element region that contributes to the operation of the transistor (semiconductor element 20) in plan view. ing. Therefore, the reliability of the semiconductor element 20 can be improved by suitably suppressing the occurrence of cracks in the portion of the passivation layer 70 that overlaps the semiconductor element region in plan view.
- the first conductive member 22 straddles the gate finger 64 (the first gate finger portion 64A in the example of FIG. 3) and the source finger 44 to form the source pad 42A (the source electrode portion 42) and the first conductive terminal. 14 are electrically connected.
- the portion of the gate finger 64 (the first portion 64A1 in the example of FIG. 3) and the portion of the source finger 44 (the first portion 44A in the example of FIG. 3) that overlap the first conductive member 22 in plan view ) is relatively easy to concentrate stress.
- First gate finger exposure slit 78A and source finger exposure slit 79 expose these portions of gate finger 64 and source finger 44, respectively. Therefore, the stress applied to the passivation layer 70 can be relaxed to suppress the occurrence of passivation cracks.
- the first conductive member 22 is a bridge-shaped member called a clip.
- the passivation layer 70 By using the passivation layer 70 according to the present disclosure, the stress applied to the passivation layer 70 can be reduced in the semiconductor device 10 using such a clip (first conductive member 22), and the occurrence of passivation cracks can be suppressed. .
- FIG. 8 is a schematic plan view of an exemplary semiconductor device 20 according to a modification.
- source electrode layer 40 may not include source fingers 44 (see FIGS. 3 and 4). In this case, the source electrode layer 40 also does not have the connecting portion 46 . That is, in FIG. 8, the source electrode layer 40 may include only the source electrode portion 42 (the source pad 42A and the source pad peripheral portion 42B).
- the gate electrode layer 60 may include gate fingers 64 annularly connected to the gate electrode portion 62 (gate pad 62A).
- passivation layer 70 may include gate finger exposing slits 78 that expose portions of gate fingers 64 along the entire length of gate fingers 64 .
- FIG. 9 is a schematic enlarged plan view of the semiconductor element 20 surrounded by the two-dot chain line F9 shown in FIG.
- FIG. 10 is a schematic cross-sectional view taken along line F10-F10 shown in FIG.
- semiconductor device 20 of FIG. 8, which does not include source finger 44 does not have first field plate contact 106A (see FIG. 4) in first peripheral trench portion 92A.
- a second field plate contact 106B is provided in the second peripheral trench portion 92B.
- field plate electrode 94 may be connected to source electrode layer 40 only through second conductive member 110B, as shown in FIG.
- Passivation layer 70 may include source pad openings 72 , source electrode exposure slits 74 , and gate finger exposure slits 78 . Even with such a modified configuration, advantages similar to those of the above-described embodiment described with reference to FIGS. 3 to 7 can be obtained.
- the semiconductor device 10 is not limited to a package having a lead frame structure, and may have another package structure.
- the semiconductor element 20 is not limited to the transistor described above.
- the source electrode (source electrode layer 40) is just an example of the first drive electrode
- the drain electrode (drain electrode layer 50) is just an example of the second drive electrode
- the gate electrode (gate electrode layer 60) is just an example of the control electrode. This is just one example.
- Semiconductor device 20 may be configured as any transistor that includes a first drive electrode, a second drive electrode, and a control electrode.
- the semiconductor element 20 is not limited to a switching element such as a transistor.
- a semiconductor element including a first wiring portion, a second wiring portion spaced apart from the first wiring portion and at least partially surrounding the first wiring portion, and a passivation layer covering the first wiring portion and the second wiring portion. If so, the structure of the present disclosure can be applied to such a semiconductor device. In this case, according to the structure of the present disclosure, by forming a first slit that exposes a portion of the first wiring portion and a second slit that exposes a portion of the second wiring portion, the occurrence of passivation cracks is suppressed. can do.
- the conductive member used in the structure of the present disclosure is not limited to a clip (a conductive member having a bridge shape).
- wires may be used instead of the first conductive members 22 to connect the semiconductor element 20 to the first conductive terminals 14 .
- wires may be used instead of second conductive members 24 to connect semiconductor device 20 to second conductive terminals 16 .
- the conductive member may be a wire. That is, if the passivation layer 70 has steps, passivation cracks due to stress may occur.
- a passivation layer 70 according to the present disclosure can also be employed when the conductive member is a wire.
- the passivation layer 70 may not have source finger exposing slits 79 that expose portions of the source fingers 44 . That is, passivation layer 70 may completely cover source fingers 44 . In this case also, cracks in the passivation layer 70 can be suppressed by the source electrode exposure slits 74, the first gate finger exposure slits 78A, and the second gate finger exposure slits 78B.
- the passivation layer 70 may not have the first and second gate finger exposing slits 78A, 78B that expose portions of the gate fingers 64; That is, passivation layer 70 may completely cover gate fingers 64 . Also in this case, cracks in the passivation layer 70 can be suppressed by the source electrode exposure slits 74 and the source finger exposure slits 79 .
- first and second gate finger exposing slits 78A, 78B may be omitted.
- the source electrode exposure slit 74 is not limited to a closed annular shape, and may be formed in an open annular shape.
- the source electrode exposure slit 74 may be discontinuous in the portion adjacent to the connection portion 46 of the source electrode layer 40 or other portion.
- the source electrode exposure slit 74 is not limited to an annular shape.
- the source electrode exposure slits 74 include six slit portions locally formed in portions of the passivation layer 70 corresponding to the corners (six corners in the example of FIG. 3) of the source pad peripheral portion 42B. can be anything. That is, the source electrode exposing slit 74 may expose at least the corners of the outer peripheral portion of the source electrode portion 42 . In this case, each slit portion may have, for example, an L-shape. Stress is relatively likely to concentrate on the portions of the passivation layer 70 corresponding to the corners of the outer peripheral portion of the source electrode portion 42 . Therefore, the configuration of this modified example can also suppress the occurrence of passivation cracks.
- the first gate finger exposing slits 78A may be formed only in the portions of the passivation layer 70 corresponding to the corners of the first gate finger portions 64A.
- the first gate finger exposure slit 78A may locally expose only the connecting portion between the first portion 64A1 and the second portion 64A2 of the first gate finger portion 64A. Stress is relatively likely to concentrate on the portions of the passivation layer 70 corresponding to the corners of the first gate finger portions 64A. Therefore, the configuration of this modified example can also suppress the occurrence of passivation cracks.
- the second gate finger exposing slits 78B may be formed only in the portions of the passivation layer 70 corresponding to the corners of the second gate finger portions 64B.
- the second gate finger exposure slit 78B may locally expose only the connecting portion between the first portion 64B1 and the second portion 64B2 of the second gate finger portion 64B. Stress is relatively likely to concentrate on the portions of the passivation layer 70 corresponding to the corners of the second gate finger portions 64B. Therefore, the configuration of this modified example can also suppress the occurrence of passivation cracks.
- the source finger exposing slit 79 is not limited to a closed annular shape, and may be formed in an open annular shape.
- the source finger exposing slits 79 may be discontinuous in portions of the source electrode layer 40 adjacent to the connecting portions 46 or other portions.
- source finger exposure slits 79 may include four slit portions formed locally in portions of passivation layer 70 corresponding to four corners of source fingers 44 . That is, the source finger exposing slits 79 may expose at least the corners of the source fingers 44 . In this case, each slit portion may have, for example, an L-shape. Stress is relatively likely to concentrate on the portions of passivation layer 70 corresponding to the corners of source fingers 44 . Therefore, the configuration of this modified example can also suppress the occurrence of passivation cracks.
- the source electrode portion 42 (outer shape of the source pad peripheral portion 42B) and the source pad 42A are not limited to a substantially L-shape in plan view, and may have an outer shape including corners in plan view. Therefore, the first end portion 22F of the first conductive member 22 is not limited to a substantially L-shape in plan view, and may have an outer shape including corners in plan view in accordance with the shape of the source pad 42A. .
- ⁇ as used in this disclosure includes the meanings of “on” and “above” unless the context clearly indicates otherwise.
- the phrase “a first layer is formed over a second layer” means that in some embodiments the first layer may be disposed directly on the second layer in contact with the second layer, but in other implementations The configuration contemplates that the first layer may be positioned above the second layer without contacting the second layer. That is, the term “on” does not exclude structures in which other layers are formed between the first and second layers.
- the Z-axis direction used in the present disclosure does not necessarily have to be the vertical direction, nor does it have to completely match the vertical direction.
- various structures according to the present disclosure e.g., the structure shown in FIG. 1 are configured such that the Z-axis "top” and “bottom” described herein are the vertical “top” and “bottom” It is not limited to one thing.
- the X-axis direction may be vertical, or the Y-axis direction may be vertical.
- the semiconductor element (20) is a first wiring portion (42) to which the conductive member (22) is connected; a second wiring portion (60) spaced apart from the first wiring portion (42) and at least partially surrounding the first wiring portion (42); a passivation layer (70) covering the first wiring portion (42) and the second wiring portion (60); including
- the passivation layer (70) comprises: a first opening (72) exposing a portion of the first wiring portion (42) as a connection region (42A) of the conductive member (22); a first slit (74) located between the first opening (72) and the second wiring part (60) and exposing a part of the first wiring part (42); a second slit (78; 78A; 78B) exposing a part of the second wiring part (60);
- a semiconductor device (10) comprising:
- the thickness (T2) of the passivation layer (70) is smaller than the thickness (T1) of the first wiring portion (42) and the thickness (T1) of the second wiring portion (60) A semiconductor device (10) according to claim.
- the passivation layer (70) at least partially penetrates the spacing region (48) between the first wiring portion (42) and the second wiring portion (60), and the spacing region (48) is The semiconductor device (10) according to appendix A1 or A2, which is stepped at positions.
- the first wiring portion (42) includes a first surface and a second surface that is continuous with the first surface of the first wiring portion and defines the separation region (48)
- the second wiring portion (60) includes a first surface and a second surface that is continuous with the first surface of the second wiring portion and defines the separation region (48)
- the passivation layer (70) comprises: a first covering portion (71A) covering the first surface of the first wiring portion (42) and the first surface of the second wiring portion (60); a second covering portion (71B) located in the spaced region (48) and covering the second surface of the first wiring portion (42) and the second surface of the second wiring portion (60);
- the passivation layer (70) includes a step formed by the first covering portion (71A) and the second covering portion (71B),
- the first wiring part (42) is a source pad (42A) exposed as the connection region from the first opening (72); a source pad peripheral portion (42B) located around the source pad (42A) and forming an outer peripheral portion of the first wiring portion (42);
- the semiconductor device (10) according to any one of Appendixes A1 to A4, wherein the first slit (74) is located on the source pad peripheral portion (42B).
- the source pad peripheral portion (42B) has an outer shape including corners in plan view, The semiconductor device (10) according to Appendix A5, wherein the first slit (74) is located on the corner of the source pad periphery (42B).
- Appendix A7 The semiconductor device (10) according to any one of Appendices A1 to A6, wherein the first slit (74) is annular.
- Appendix A8 The semiconductor device (10) according to Appendix A7, wherein the first slit (74) is formed in a closed ring shape.
- said second wiring portion (60) includes a gate finger (64) spaced from said first wiring portion (42) and extending along said first wiring portion (42);
- the semiconductor device (10) according to any one of the appendices A1-A8, wherein said second slit (78A; 78B) is located above said gate finger (64).
- said gate finger (64) includes a corner;
- the second wiring portion (60) further includes a gate electrode portion (62),
- the gate finger (64) extends from the gate electrode portion (62) so as to annularly surround the first wiring portion (42),
- the semiconductor device (10) according to Appendix A9 or A10, wherein the second slit (78A; 78B) is located on the gate finger (64) over the entire length of the gate finger (64).
- the semiconductor element (20) further includes a third wiring portion (44) spaced apart from the second wiring portion (60) and at least partially surrounding the second wiring portion (60),
- the passivation layer (70) further covers the third wiring portion (44),
- the third wiring portion (44) includes a source finger (44) spaced from the second wiring portion (60) and extending along the second wiring portion (42);
- said source finger (44) includes a corner;
- the source finger (44) surrounds the second wiring portion (60) in an annular shape,
- the semiconductor device (10) according to Appendix A13 or A14, wherein the third slit (79) is annular.
- the semiconductor element (20) is a transistor having a split gate structure formed in a semiconductor element region, The semiconductor according to any one of Appendices A1 to A17, wherein the first slit (74) and the second slit (78A; 78B) are arranged at positions overlapping with the semiconductor element region in plan view.
- Appendix A19 further comprising a conductive terminal (14) positioned adjacent to the semiconductor element (20);
- the conductive member (22) connects the first wiring part (42) and the conductive terminal (14) across the second wiring part (60),
- the second slit (78A; 78B) exposes a portion of the second wiring portion (60) overlapping the conductive member (22) in plan view.
- a semiconductor device (10) according to claim.
- the conductive member (22) has a flat plate-like first end and a second end, and an intermediate portion positioned between the first end and the second end and bent stepwise.
- the semiconductor device (10) according to any one of Appendices A1 to A19, which is a clip having a bridge shape.
- the semiconductor element (20) is a first wiring portion (42) to which the conductive member (22) is connected; a second wiring portion (60) spaced apart from the first wiring portion (42) and at least partially surrounding the first wiring portion (42); a third wiring portion (44) spaced apart from the second wiring portion (60) and at least partially surrounding the second wiring portion (60); a passivation layer (70) covering the first wiring portion (42), the second wiring portion (60), and the third wiring portion (44); including
- the passivation layer (70) comprises: a first opening (72) exposing a portion of the first wiring portion (42) as a connection region (42A) of the conductive member (22); an inner peripheral slit (74) located between the first opening (72) and the second wiring part (60) and exposing a part of the first wiring part (42); at least one outer peripheral slit (78; 78A; 78B; 79) exposing at least one of a portion of the second wiring portion
- the passivation layer (70) comprises: a first opening (72) exposing a part of the first wiring part (42); a first slit (74) located between the first opening (72) and the second wiring part (60) and exposing a part of the first wiring part (42); a second slit (78; 78A; 78B) exposing a part of the second wiring part (60);
- a semiconductor device (20) comprising:
- SYMBOLS 10 Semiconductor device 12... Conductive plate 14... First conductive terminal 16... Second conductive terminal 20... Semiconductor element 22... First conductive member 24... Second conductive member 40... Source electrode layer 42... Source electrode portion (first wiring part) 42A... source pad (connection area) 42B... Source pad peripheral portion 44... Source finger 48... Spacing region 60... Gate electrode layer (second wiring portion) 62 Gate electrode portion 62A Gate pad 64 Gate finger 64A First gate finger portion 64B Second gate finger portion 70 Passivation layer 71A First covering portion 71B Second covering portion 71C Third covering portion 72 ... source pad opening (first opening) 74 ... Source electrode exposure slit (first slit) 76... Gate pad opening 78...
- Gate finger exposing slit 78A First gate finger exposing slit (second slit) 78B. Second gate finger exposure slit (second slit) 79 ... Source finger exposure slit (third slit) T1, T2...Thickness W1, W2, W3...Width (slit width)
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Abstract
Description
図2は、第1および第2導電部材22,24を取り外した状態の半導体装置10の概略平面図である。図3は、半導体素子20の概略平面図である。なお、図示の複雑化を避けるため、図2では、図3の半導体素子20の平面図を簡略化して示している。
ソース電極露出スリット74は、ソースパッド周辺部42Bと平面視で重なるパッシベーション層70の部分に環状に形成され得る。図3の例では、ソース電極露出スリット74は閉じた環状に形成されている。したがって、ソース電極露出スリット74は、ソースパッド周辺部42B(ソース電極部42の外周部分)の全周に亘って形成されている。すなわち、ソース電極露出スリット74は、ソースパッド周辺部42Bの全周に亘ってソースパッド周辺部42Bの一部を露出させている。
図5において、ドレイン電極層50が設けられた半導体基板32は、トランジスタ(MISFET)のドレイン領域として機能する。半導体層34は、半導体基板(ドレイン領域)32上に形成されたドリフト領域82と、ドリフト領域82上に形成されたボディ領域84と、ボディ領域84上に形成されたソース領域86とを含む。
半導体素子20は、ソース電極層40とゲート電極層60とを覆うパッシベーション層70を含む。ソース電極層40は、ソース電極部42およびソースフィンガー44を含む。ゲート電極層60は、ゲート電極部62およびゲートフィンガー64を含む。ゲートフィンガー64は、ソース電極部42の周囲を少なくとも部分的に囲んでいる。ソースフィンガー44は、ゲート電極層60の周囲を少なくとも部分的に囲んでいる。
(1-1)パッシベーション層70は、ソースパッド周辺部42B(ソース電極部42の外周部分)の一部を露出させるソース電極露出スリット74を含む。したがって、ソースパッド42Aに接続された第1導電部材22からパッシベーション層70にかかる応力、特にソースパッド周辺部42B上のパッシベーション層70の部分にかかる応力は、ソース電極露出スリット74によって緩和される。これにより、パッシベーションクラックの発生を抑制することができる。
上記各実施形態は、以下のように変更して実施することができる。また、上記各実施形態および以下の各変更例は、技術的に矛盾しない範囲で互いに組み合わせて実施することができる。
・半導体素子20は、上記で説明したトランジスタに限定されない。ソース電極(ソース電極層40)は第1駆動電極の一例に過ぎず、ドレイン電極(ドレイン電極層50)は第2駆動電極の一例に過ぎず、ゲート電極(ゲート電極層60)は制御電極の一例に過ぎない。半導体素子20は、第1駆動電極、第2駆動電極、および制御電極を含む任意のトランジスタとして構成されてよい。
・ソース電極露出スリット74は、閉じた環状に限定されず、開いた環状に形成されてもよい。例えば、ソース電極露出スリット74は、ソース電極層40の接続部46に隣接する部分もしくは他の部分において非連続とされてもよい。
上記各実施形態および各変更例から把握できる技術的思想を以下に記載する。なお、各付記に記載された構成要素に対応する実施形態の構成要素の符号を括弧書きで示す。符号は、理解の補助のために例として示すものであり、各付記に記載された構成要素は、符号で示される構成要素に限定されるべきではない。
半導体素子(20)と、
導電部材(22)と、を備え、
前記半導体素子(20)は、
前記導電部材(22)が接続される第1配線部(42)と、
前記第1配線部(42)から離間するとともに前記第1配線部(42)を少なくとも部分的に囲む第2配線部(60)と、
前記第1配線部(42)および前記第2配線部(60)を覆うパッシベーション層(70)と、
を含み、
前記パッシベーション層(70)は、
前記第1配線部(42)の一部を前記導電部材(22)の接続領域(42A)として露出させる第1開口(72)と、
前記第1開口(72)と前記第2配線部(60)との間に位置し、前記第1配線部(42)の一部を露出させる第1スリット(74)と、
前記第2配線部(60)の一部を露出させる第2スリット(78;78A;78B)と、
を含む、半導体装置(10)。
前記パッシベーション層(70)の厚さ(T2)は、前記第1配線部(42)の厚さ(T1)および前記第2配線部(60)の厚さ(T1)よりも小さい、付記A1に記載の半導体装置(10)。
前記パッシベーション層(70)は、前記第1配線部(42)と前記第2配線部(60)との間の離間領域(48)に少なくとも部分的に入り込んでおり、前記離間領域(48)の位置で段差状に形成されている、付記A1またはA2に記載の半導体装置(10)。
前記第1配線部(42)は、第1面と、前記第1配線部の第1面に連続し前記離間領域(48)を画定する第2面とを含み、
前記第2配線部(60)は、第1面と、前記第2配線部の第1面に連続し前記離間領域(48)を画定する第2面とを含み、
前記パッシベーション層(70)は、
前記第1配線部(42)の第1面および前記第2配線部(60)の第1面を覆う第1被覆部分(71A)と、
前記離間領域(48)に位置し、前記第1配線部(42)の第2面および前記第2配線部(60)の第2面を覆う第2被覆部分(71B)と、を含み、
前記パッシベーション層(70)は、前記第1被覆部分(71A)と前記第2被覆部分(71B)とによって形成される段差を含み、
前記第1開口(72)、前記第1スリット(74)、および前記第2スリット(78A;78B)は、前記第1被覆部分(71A)に形成されている、付記A3に記載の半導体装置(10)。
前記第1配線部(42)は、
前記第1開口(72)から前記接続領域として露出されるソースパッド(42A)と、
前記ソースパッド(42A)の周辺に位置し、前記第1配線部(42)の外周部分を形成するソースパッド周辺部(42B)と、を含み、
前記第1スリット(74)は、前記ソースパッド周辺部(42B)上に位置している、付記A1~A4のうちのいずれか一つに記載の半導体装置(10)。
前記ソースパッド周辺部(42B)は、平面視において、角部を含む外形形状を有し、
前記第1スリット(74)は、前記ソースパッド周辺部(42B)の前記角部上に位置している、付記A5に記載の半導体装置(10)。
前記第1スリット(74)は環状に形成されている、付記A1~A6のうちのいずれか一つに記載の半導体装置(10)。
前記第1スリット(74)は閉じた環状に形成されている、付記A7に記載の半導体装置(10)。
前記第2配線部(60)は、前記第1配線部(42)から離間するとともに前記第1配線部(42)に沿って延在するゲートフィンガー(64)を含み、
前記第2スリット(78A;78B)は、前記ゲートフィンガー(64)上に位置している、付記A1~A8のうちのいずれか一つに記載の半導体装置(10)。
前記ゲートフィンガー(64)は角部を含み、
前記第2スリット(78A;78B)は、前記ゲートフィンガー(64)の前記角部上に位置している、付記A9に記載の半導体装置(10)。
前記第2配線部(60)はゲート電極部(62)をさらに含み、
前記ゲートフィンガー(64)は、前記第1配線部(42)の周囲を環状に囲むように前記ゲート電極部(62)から延在しており、
前記第2スリット(78A;78B)は、前記ゲートフィンガー(64)の全長に亘って前記ゲートフィンガー(64)上に位置している、付記A9またはA10に記載の半導体装置(10)。
前記半導体素子(20)は、前記第2配線部(60)から離間するとともに前記第2配線部(60)を少なくとも部分的に囲む第3配線部(44)をさらに含み、
前記パッシベーション層(70)は、前記第3配線部(44)をさらに覆っており、
前記パッシベーション層(70)は、前記第3配線部(44)の一部を露出させる第3スリット(79)をさらに含む、付記A1~A11のうちのいずれか一つに記載の半導体装置(10)。
前記第3配線部(44)は、前記第2配線部(60)から離間するとともに前記第2配線部(42)に沿って延在するソースフィンガー(44)を含み、
前記第3スリット(79)は、前記ソースフィンガー(44)上に位置している、付記A12に記載の半導体装置(10)。
前記ソースフィンガー(44)は角部を含み、
前記第3スリット(79)は、前記ソースフィンガー(44)の前記角部上に位置している、付記A13に記載の半導体装置(10)。
前記ソースフィンガー(44)は前記第2配線部(60)の周囲を環状に囲んでおり、
前記第3スリット(79)は環状に形成されている、付記A13またはA14に記載の半導体装置(10)。
前記第3スリット(79)は閉じた環状に形成されている、付記A15に記載の半導体装置(10)。
前記第1スリットの幅(W1)は、前記第2スリット(W2)の幅と同じである、付記A1~A16のうちのいずれか一つに記載の半導体装置(10)。
前記半導体素子(20)は、半導体素子領域に形成されたスプリットゲート構造を有するトランジスタであり、
前記第1スリット(74)および前記第2スリット(78A;78B)は、平面視において前記半導体素子領域と重なる位置に配置されている、付記A1~A17のうちのいずれか一つに記載の半導体装置(10)。
前記半導体素子(20)に隣接して配置される導電端子(14)をさらに備え、
前記導電部材(22)は、前記第2配線部(60)を跨いで前記第1配線部(42)と前記導電端子(14)とを接続しており、
前記第2スリット(78A;78B)は、前記導電部材(22)と平面視で重なる前記第2配線部(60)の部分を露出させている、付記A1~A18のうちのいずれか一つに記載の半導体装置(10)。
前記導電部材(22)は、各々平板状の第1端部および第2端部と、前記第1端部と前記第2端部との間に位置し段状に屈曲された中間部とを含み、ブリッジ形状を有するクリップである、付記A1~A19のうちのいずれか一つに記載の半導体装置(10)。
半導体素子(20)と、
導電部材(22)と、を備え、
前記半導体素子(20)は、
前記導電部材(22)が接続される第1配線部(42)と、
前記第1配線部(42)から離間するとともに前記第1配線部(42)を少なくとも部分的に囲む第2配線部(60)と、
前記第2配線部(60)から離間するとともに前記第2配線部(60)を少なくとも部分的に囲む第3配線部(44)と、
前記第1配線部(42)、前記第2配線部(60)、および前記第3配線部(44)を覆うパッシベーション層(70)と、
を含み、
前記パッシベーション層(70)は、
前記第1配線部(42)の一部を前記導電部材(22)の接続領域(42A)として露出させる第1開口(72)と、
前記第1開口(72)と前記第2配線部(60)との間に位置し、前記第1配線部(42)の一部を露出させる内周側スリット(74)と、
前記第2配線部(60)の一部および前記第3配線部(44)の一部のうちの少なくとも一方を露出させる少なくとも一つの外周側スリット(78;78A;78B;79)と、
を含む、半導体装置(10)。
第1配線部(42)と、
前記第1配線部(42)から離間するとともに前記第1配線部(42)を少なくとも部分的に囲む第2配線部(60)と、
前記第1配線部(42)および前記第2配線部(60)を覆うパッシベーション層(70)と、を備え、
前記パッシベーション層(70)は、
前記第1配線部(42)の一部を露出させる第1開口(72)と、
前記第1開口(72)と前記第2配線部(60)との間に位置し、前記第1配線部(42)の一部を露出させる第1スリット(74)と、
前記第2配線部(60)の一部を露出させる第2スリット(78;78A;78B)と、
を含む、半導体素子(20)。
12…導電板
14…第1導電端子
16…第2導電端子
20…半導体素子
22…第1導電部材
24…第2導電部材
40…ソース電極層
42…ソース電極部(第1配線部)
42A…ソースパッド(接続領域)
42B…ソースパッド周辺部
44…ソースフィンガー
48…離間領域
60…ゲート電極層(第2配線部)
62…ゲート電極部
62A…ゲートパッド
64…ゲートフィンガー
64A…第1ゲートフィンガー部
64B…第2ゲートフィンガー部
70…パッシベーション層
71A…第1被覆部分
71B…第2被覆部分
71C…第3被覆部分
72…ソースパッド開口(第1開口)
74…ソース電極露出スリット(第1スリット)
76…ゲートパッド開口
78…ゲートフィンガー露出スリット
78A…第1ゲートフィンガー露出スリット(第2スリット)
78B…第2ゲートフィンガー露出スリット(第2スリット)
79…ソースフィンガー露出スリット(第3スリット)
T1,T2…厚さ
W1,W2,W3…幅(スリット幅)
Claims (20)
- 半導体素子と、
導電部材と、を備え、
前記半導体素子は、
前記導電部材が接続される第1配線部と、
前記第1配線部から離間するとともに前記第1配線部を少なくとも部分的に囲む第2配線部と、
前記第1配線部および前記第2配線部を覆うパッシベーション層と、
を含み、
前記パッシベーション層は、
前記第1配線部の一部を前記導電部材の接続領域として露出させる第1開口と、
前記第1開口と前記第2配線部との間に位置し、前記第1配線部の一部を露出させる第1スリットと、
前記第2配線部の一部を露出させる第2スリットと、
を含む、半導体装置。 - 前記パッシベーション層の厚さは、前記第1配線部の厚さおよび前記第2配線部の厚さよりも小さい、請求項1に記載の半導体装置。
- 前記パッシベーション層は、前記第1配線部と前記第2配線部との間の離間領域に少なくとも部分的に入り込んでおり、前記離間領域の位置で段差状に形成されている、請求項1または2に記載の半導体装置。
- 前記第1配線部は、第1面と、前記第1配線部の第1面に連続し前記離間領域を画定する第2面とを含み、
前記第2配線部は、第1面と、前記第2配線部の第1面に連続し前記離間領域を画定する第2面とを含み、
前記パッシベーション層は、
前記第1配線部の第1面および前記第2配線部の第1面を覆う第1被覆部分と、
前記離間領域に位置し、前記第1配線部の第2面および前記第2配線部の第2面を覆う第2被覆部分と、を含み、
前記パッシベーション層は、前記第1被覆部分と前記第2被覆部分とによって形成される段差を含み、
前記第1開口、前記第1スリット、および前記第2スリットは前記第1被覆部分に形成されている、請求項3に記載の半導体装置。 - 前記第1配線部は、
前記第1開口から前記接続領域として露出されるソースパッドと、
前記ソースパッドの周辺に位置し、前記第1配線部の外周部分を形成するソースパッド周辺部と、を含み、
前記第1スリットは、前記ソースパッド周辺部上に位置している、請求項1~4のうちのいずれか一項に記載の半導体装置。 - 前記ソースパッド周辺部は、平面視において、角部を含む外形形状を有し、
前記第1スリットは、前記ソースパッド周辺部の前記角部上に位置している、請求項5に記載の半導体装置。 - 前記第1スリットは環状に形成されている、請求項1~6のうちのいずれか一項に記載の半導体装置。
- 前記第1スリットは閉じた環状に形成されている、請求項7に記載の半導体装置。
- 前記第2配線部は、前記第1配線部から離間するとともに前記第1配線部に沿って延在するゲートフィンガーを含み、
前記第2スリットは、前記ゲートフィンガー上に位置している、請求項1~8のうちのいずれか一項に記載の半導体装置。 - 前記ゲートフィンガーは角部を含み、
前記第2スリットは、前記ゲートフィンガーの前記角部上に位置している、請求項9に記載の半導体装置。 - 前記第2配線部はゲート電極部をさらに含み、
前記ゲートフィンガーは、前記第1配線部の周囲を環状に囲むように前記ゲート電極部から延在しており、
前記第2スリットは、前記ゲートフィンガーの全長に亘って前記ゲートフィンガー上に位置している、請求項9または10に記載の半導体装置。 - 前記半導体素子は、前記第2配線部から離間するとともに前記第2配線部を少なくとも部分的に囲む第3配線部をさらに含み、
前記パッシベーション層は、前記第3配線部をさらに覆っており、
前記パッシベーション層は、前記第3配線部の一部を露出させる第3スリットをさらに含む、請求項1~11のうちのいずれか一項に記載の半導体装置。 - 前記第3配線部は、前記第2配線部から離間するとともに前記第2配線部に沿って延在するソースフィンガーを含み、
前記第3スリットは、前記ソースフィンガー上に位置している、請求項12に記載の半導体装置。 - 前記ソースフィンガーは角部を含み、
前記第3スリットは、前記ソースフィンガーの前記角部上に位置している、請求項13に記載の半導体装置。 - 前記ソースフィンガーは前記第2配線部の周囲を環状に囲んでおり、
前記第3スリットは環状に形成されている、請求項13または14に記載の半導体装置。 - 前記第3スリットは閉じた環状に形成されている、請求項15に記載の半導体装置。
- 前記第1スリットの幅は、前記第2スリットの幅と同じである、請求項1~16のうちのいずれか一項に記載の半導体装置。
- 前記半導体素子は、半導体素子領域に形成されたスプリットゲート構造を有するトランジスタであり、
前記第1スリットおよび前記第2スリットは、平面視において前記半導体素子領域と重なる位置に配置されている、請求項1~17のうちのいずれか一項に記載の半導体装置。 - 前記半導体素子に隣接して配置される導電端子をさらに備え、
前記導電部材は、前記第2配線部を跨いで前記第1配線部と前記導電端子とを接続しており、
前記第2スリットは、前記導電部材と平面視で重なる前記第2配線部の部分を露出させている、請求項1~18のうちのいずれか一項に記載の半導体装置。 - 前記導電部材は、各々平板状の第1端部および第2端部と、前記第1端部と前記第2端部との間に位置し段状に屈曲された中間部とを含み、ブリッジ形状を有するクリップである、請求項1~19のうちのいずれか一項に記載の半導体装置。
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WO2020213603A1 (ja) * | 2019-04-19 | 2020-10-22 | ローム株式会社 | SiC半導体装置 |
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