# US 12,009,315 B2 · Component carrier structure connectable by electrically conductive connection medium in recess with cavity having surface profile

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- Number: US 12,009,315 B2
- Document ID: US12009315B2
- Status: Granted
- Kind: B2
- Application number: 16/948,106
- Filed: 2020-09-03
- Published: 2022-03-03
- Granted: 2024-06-11
- Earliest claimed: 2020-09-03
- Assignees: AT&SAustria Technologie & Systemtechnik AG
- Applicants: AT&S Austria Technologie & Systemtechnik Aktiengesellschaft
- Inventors: Abderrazzaq Ifis
- Web page: https://patentgrep.com/patent/US12009315B2

## CPC

- H05K 3/368: {parallel to each other (H05K3/361 takes precedence)}
- H10W 42/121: {protecting against mechanical damage (H10W76/00, H10W74/00 take precedence)}
- H05K 3/4007: {Surface contacts, e.g. bumps (H05K3/4092 takes precedence; deposition of finish layers on pads H05K3/24; forming solder bumps H05K3/3465)}
- H10W 70/05: of insulating or insulated package substrates, or of interposers, or of redistribution layers (manufacture or treatment of leadframes H10W70/04)
- H10W 70/098: {Applying pastes or inks, e.g. screen printing (H10W70/095 takes precedence)}
- H10W 70/65: Shapes or dispositions of interconnections
- H10W 70/6525: {for securing the interconnections to the substrate, e.g. to prevent peeling}
- H10W 70/666: {Organic materials or pastes}
- H10W 70/685: comprising multiple insulating layers
- H10W 90/701: {characterised by the relative positions of pads or connectors relative to package parts}
- H05K 2201/09745: Recess in conductor, e.g. in pad or in metallic substrate
- H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H10W: GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10

## Abstract

A component carrier with a first component carrier structure including a first stack which has at least one first electrically conductive layer structure and at least one first electrically insulating layer structure is disclosed. The at least one first electrically conductive layer structure has a first contact element which extends up to a first contact surface of the first stack. An electrically conductive connection medium is directly connected to the first contact element at the first contact surface by filling at least one recess of the first contact element. The at least one recess having a larger dimensioned cavity delimited by a smaller dimensioned surface profile.

## Claims

### Claim 1

A component carrier, comprising:
a first component carrier structure comprising a first stack which comprises at least one first electrically conductive layer structure and at least one first electrically insulating layer structure, wherein the at least one first electrically conductive layer structure has a first contact element which extends to a first contact surface of the first stack;
an electrically conductive connection medium filled into through holes of a dielectric sheet directly connected to the first contact element at the first contact surface by filling at least one recess of the first contact element, the at least one recess comprising a larger dimensioned cavity delimited by a smaller dimensioned surface profile traversing the at least one recess of the first contact element across the through hole; and
a second component carrier structure comprising a second stack which comprises at least one second electrically conductive layer structure and at least one second electrically insulating layer structure, wherein the at least one second electrically conductive layer structure has a second contact element which extends to a respective contact surface of the second stack;
wherein the electrically conductive connection medium in the through holes of the dielectric sheet connects the first contact element at the first contact surface with the second contact element at the respective contact surface of the second stack;
wherein the at least one recess of the first contact element is aligned with at least one recess of the second contact element, the at least one recess of the second contact element comprising a respective larger dimensioned cavity delimited by a respective smaller dimensioned surface profile traversing the at least one recess of the second contact element across the through hole,
wherein the at least one recess of the first contact element and the at least one recess of the second contact element confine the electrically conductive connection medium such that the first contact element and the second contact element connect the first contact surface of the first stack with the second contact surface of the second stack with the electrically conductive medium at least partially therebetween.

### Claim 2 (depends on 1)

The component carrier according to claim 1, further comprising:
a component connected to the first contact element.

### Claim 3 (depends on 1)

The component carrier according to claim 1, comprising at least one of the following features:
wherein the larger dimensioned cavity has a depth of at least 10 μm;
wherein the larger dimensioned cavity has a width of at least 20 μm;
wherein the surface profile has an average top to bottom distance of at least 2 μm;
wherein the surface profile has an average top to bottom distance of not more than 15 μm.

### Claim 4 (depends on 1)

The component carrier according to claim 1, comprising at least one of the following features:
wherein the larger dimensioned cavity has a round shape;
wherein the larger dimensioned cavity has rounded corners.

### Claim 5 (depends on 2)

The component carrier according to claim 2, wherein the electrically conductive connection medium in the through holes of the dielectric sheet connects the first contact element at the first contact surface with the second contact element at the respective contact surface of the second stack by filling at least one recess of the second contact element.

### Claim 6 (depends on 1)

The component carrier according to claim 1, wherein the electrically conductive connection medium comprises a viscous deformable medium.

### Claim 7 (depends on 1)

The component carrier according to claim 1, wherein the electrically conductive connection medium comprises an electrically conductive polymer.

### Claim 8 (depends on 1)

The component carrier according to claim 1, wherein at least one of the first contact element and the second contact element contributes to an electrically conductive vertical through connection for vertically electrically connecting the first component carrier structure and the second component carrier structure.

### Claim 9 (depends on 1)

The component carrier according to claim 1, wherein at least one of the first contact element and the second contact element comprises a via with tapering sidewalls.

### Claim 10 (depends on 1)

The component carrier according to claim 1, wherein the dielectric sheet comprises an adhesive material.

### Claim 11

A method of manufacturing a component carrier, the method comprising:
forming a first component carrier structure comprising a first stack which comprises at least one first electrically conductive layer structure and at least one first electrically insulating layer structure, wherein the at least one first electrically conductive layer structure has a first contact element which extends up to a first contact surface of the first stack;
filling at least one recess of the first contact element with an electrically conductive medium by filling through holes of a dielectric sheet directly connected to the first contact element at the first contact surface, the at least one recess comprising a larger dimensioned cavity delimited by a smaller dimensioned surface profile traversing a via;
forming a second component carrier structure comprising a second stack which comprises at least one second electrically conductive layer structure and at least one second electrically insulating layer structure, wherein the at least one second electrically conductive layer structure has a second contact element which extends to a respective contact surface of the second stack; and
connecting the first contact element at the first contact surface with the second contact element at the second contact surface by filling the at least one recess of the first contact element and optionally of the second contact element with the electrically conductive connection medium;
wherein the at least one recess of the first contact element is aligned with at least one recess of the second contact element, the at least one recess of the second contact element comprising a respective larger dimensioned cavity delimited by a respective smaller dimensioned surface profile traversing the at least one recess of the second contact element across the through hole,
wherein the at least one recess of the first contact element and the at least one recess of the second contact element confine the electrically conductive connection medium such that the first contact element and the second contact element connect the first contact surface of the first stack with the second contact surface of the second stack with the electrically conductive medium at least partially therebetween.

### Claim 12 (depends on 11)

The method according to claim 11, the method further comprising:
providing a component; and
connecting the first contact element at the first contact surface with the component.

### Claim 13 (depends on 11)

The method according to claim 11, wherein the method comprises filling the electrically conductive connection medium into the at least one recess of the first contact element when connecting the first component carrier structure with the second component carrier structure.

### Claim 14 (depends on 11)

The method according to claim 11, comprising at least one of the following features:
wherein the method comprises providing the dielectric sheet with a curable material, and at least partially curing the curable material of the dielectric sheet upon connecting the first component carrier structure with the second component carrier structure with the dielectric sheet in between;
wherein the method comprises forming the at least one through hole of the dielectric sheet by one of the group consisting of drilling, punching, and etching;
wherein the method comprises filling the electrically conductive connection medium in form of a paste in the at least one through hole of the dielectric sheet.

### Claim 15 (depends on 11)

The method according to claim 11, wherein the method comprises forming the at least one recess by etching, drilling, or grinding at least one of the first contact element at the first contact surface, and the second contact element at the respective contact surface.

### Claim 16 (depends on 15)

The method according to claim 15, wherein the method comprises covering at least one of part of the first contact surface, and part of the second contact surface with a protection structure during etching, drilling, or grinding.