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

• US 10,643,970 B2
• Filed: 01/16/2019
• Issued: 05/05/2020
• Est. Priority Date: 11/03/2016
• Status: Active Grant

• Current Assignee: STMicroelectronics SAS (STMicroelectronics NV)
• Original Assignee: STMicroelectronics SAS (STMicroelectronics NV)
• Inventors: Auchere, David, Hajji, Asma, Quercia, Fabien, Lopez, Jerome
• Primary Examiner(s): Tran, Trang Q
• Application Number:
  US16/249,122
• Publication Number:
  US 20190148334A1
• Time in Patent Office: 475 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;

at least one electrical connection wire connecting an electrical connection pad of the carrier substrate and an electrical connection pad of the electronic chip;

an insulating sheath made of a dielectric material which surrounds the electrical connection wire except at exposed ends of the electrical connection wire;

a local dielectric coating made of a dielectric material at least partially covering said at least one of the electrical connection pad, one exposed end of the electrical connection wire and at least partially surrounding at least one end of the insulating sheath adjacent to said at least one electrical connection pad;

at least one additional electrical connection wire connecting an additional electrical connection pad of the carrier substrate and an additional electrical connection pad of the electronic chip; and

a conductive shield made of an electrically conductive material at least partially covering the local dielectric coating and at least partially surrounding the insulating sheath, and wherein the conductive shield makes direct contact with the additional electrical connection wire, the additional electrical connection pad of the carrier substrate and the additional electrical connection pad of the electronic chip.

2. The device according to claim 1, wherein the local dielectric coating comprises:

a first local dielectric coating on the electrical connection pad of the carrier substrate, a first electrical junction between the one exposed end of the electrical connection wire and the electrical connection pad of the carrier substrate, and the one exposed end of the electrical connection wire, and which at least partially surrounds a first end portion of the insulating sheath adjacent to the first electrical junction; and

a second local dielectric coating on the electrical connection pad of the electronic chip, a second electrical junction between another exposed end of the electrical connection wire and the electrical connection pad of the electronic chip, and the another exposed end of the electrical connection wire, and which at least partially surrounds a second end portion of the insulating sheath adjacent to the second electrical junction.

3. The device according to claim 2, wherein the electrically conductive material covers the first and second local dielectric coatings and surrounds the insulating sheath between the first and second local dielectric coatings.

4. 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;

an insulating sheath made of a dielectric material which surrounds the first electrical connection wire except at exposed ends of the first electrical connection wire

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 first coating made of a dielectric material covering the first electrical connection pad of the carrier substrate and one exposed end of the first electrical connection wire;

a second coating made of a dielectric material covering the first electrical connection pad of the electronic chip and another exposed end of the first electrical connection wire; and

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

5. The electronic device according to claim 4, wherein the local conductive shield completely covers insulating sheath, the first coating and the second coating.