Method for forming an electrical connection between an electronic chip and a carrier substrate and electronic device

• US 10,224,306 B2
• Filed: 05/23/2017
• Issued: 03/05/2019
• Est. Priority Date: 11/03/2016
• Status: Active Grant

• Current Assignee: STMicroelectronics Grenoble 2 SAS (STMicroelectronics NV)
• Original Assignee: STMicroelectronics Grenoble 2 SAS (STMicroelectronics NV)
• Inventors: Auchere, David, Hajji, Asma, Quercia, Fabien, Lopez, Jerome
• Primary Examiner(s): Tran, Trang Q
• Application Number:
  US15/602,278
• Publication Number:
  US 20180122770A1
• Time in Patent Office: 651 Days
• CPC Class Codes: H01L 2224/2919 with a principal constituent of the material being a polymer, e.g. polyester, phenolic based polymer, epoxy
• CPC Class Codes: H01L 2224/32225 the item being non-metallic, e.g. insulating substrate with or without metallisation
• CPC Class Codes: H01L 2224/45099 Material
• CPC Class Codes: H01L 2224/45565 Single coating layer
• CPC Class Codes: H01L 2224/45686 with a principal constituent of the material being a non metallic, non metalloid inorganic material
• CPC Class Codes: H01L 2224/4569 with a principal constituent of the material being a polymer, e.g. polyester, phenolic based polymer, epoxy
• CPC Class Codes: H01L 2224/48228 the bond pad being disposed in a recess of the surface of the item
• CPC Class Codes: H01L 2224/48992 Reinforcing structures
• CPC Class Codes: H01L 2224/48997 Reinforcing structures
• CPC Class Codes: H01L 2224/49175 Parallel arrangements
• CPC Class Codes: H01L 2224/73265 Layer and wire connectors
• CPC Class Codes: H01L 2224/85815 Reflow soldering
• CPC Class Codes: H01L 2224/8592 Applying permanent coating, e.g. protective coating
• CPC Class Codes: H01L 23/3157 Partial encapsulation or coating mask layer used as insulation layer H01L21/31
• CPC Class Codes: H01L 23/552 Protection against radiation, e.g. light or electromagnetic waves
• CPC Class Codes: H01L 24/29 of an individual layer connector
• CPC Class Codes: H01L 24/32 of an individual layer connector
• CPC Class Codes: H01L 24/45 of an individual wire connector
• CPC Class Codes: H01L 24/48 of an individual wire connector
• CPC Class Codes: H01L 24/49 of a plurality of wire connectors
• CPC Class Codes: H01L 24/85 : using a wire connector wire bonding in general B23K20/004
• CPC Class Codes: H01L 2924/00014 : the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
• CPC Class Codes: H01L 2924/3025 : Electromagnetic shielding

Abstract

An electrical connection wire connects an electrical connection pad of an electrical chip and an electrical connection pad of a carrier substrate to which the electronic chip is mounted. A dielectric layer surrounds at least the bonding wire. The dielectric layer may be a dielectric sheath or a hardened liquid dielectric material. A dielectric material may also cover at least a portion of the electrical chip and carrier substrate. A liquid electrically conductive material is deposited and hardened to form a local conductive shield surrounding the dielectric layer at the bonding wire.

Claims

1. An electronic device, comprising:

a carrier substrate;

an electronic chip mounted on the carrier substrate and including a first electrical connection pad and a second electrical connection pad;

a first electrical connection wire connecting a first electrical connection pad of the carrier substrate and the first electrical connection pad of the electronic chip;

a second electrical connection wire connecting a second electrical connection pad of the carrier substrate and the second electrical connection pad of the electronic chip;

a dielectric layer made of a dielectric material on top of a zone of the electronic chip and of the carrier substrate, the dielectric layer covering the first electrical connection wire and the first electrical connection pads but not covering the second electrical connection wire and the second electrical connection pads, such that the dielectric layer forms a local dielectric coating which completely surrounds the first electrical connection wire and completely covers the first electrical connection pads; and

a local conductive shield made of an electrically conductive material at least partially covering the local dielectric coating and directly contacting the second electrical connection wire and the second electrical connection pads.

2. The electronic device according to claim 1, wherein the local conductive shield completely covers the local dielectric coating, the second electrical connection wire and the second electrical connection pads.

6. The device according to claim 1, wherein the dielectric layer has a non-uniform thickness along a length of the first electrical connection wire.

3. An electronic device, comprising:

a carrier substrate;

an electronic chip mounted on the carrier substrate;

a first electrical connection wire connecting between a first electrical connection pad at the carrier substrate and a second electrical connection pad at the electronic chip;

a second electrical connection wire connecting between a third electrical connection pad at the carrier substrate and a fourth electrical connection pad at the electronic chip;

a dielectric material which completely covers the first electrical connection wire, the first electrical connection pad and the second electrical connection pad but does cover any part of the second electrical connection wire, the third electrical connection pad and the fourth electrical connection pad; and

an electrically conductive material that completely covers said dielectric material and is in physical and electrical contact with at least the second electrical connection wire.

4. The electronic device according to claim 3, wherein the electrically conductive material further completely covers the second electrical connection wire, the third electrical connection pad and the fourth electrical connection pad.

5. The electronic device according to claim 4, wherein the dielectric material has a non-uniform thickness along a length of the first electrical connection wire.