Wire bonding methods and systems incorporating metal nanoparticles

Patent metadata

Field	Value
Publication number	US-10283482-B2
Application number	US-201715852876-A
Country	US
Kind code	B2
Filing date	Dec 22, 2017
Priority date	Aug 18, 2015
Publication date	May 7, 2019
Grant date	May 7, 2019

Abstract

Wire bonding operations can be facilitated through the use of metal nanoparticle compositions. Both ball bonding and wedge bonding processes can be enhanced in this respect. Wire bonding methods can include providing a wire payout at a first location from a rolled wire source via a dispensation head, contacting a first metal nanoparticle composition and a first portion of the wire payout with a bonding pad, and at least partially fusing metal nanoparticles in the first metal nanoparticle composition together to form an adhering interface between the bonding pad and the first portion of the wire payout. The adhering interface can have a nanoparticulate morphology. Wire bonding systems can include a rolled wire source, a dispensation head configured to provide a wire payout, and an applicator configured to place a metal nanoparticle composition upon at least a portion of the wire payout or upon a bonding pad.

First claim

What is claimed is the following:

1. An electrical package comprising:
a bonding pad in electrical communication with an electronic component;
a lead;
a plurality of wire loops extending between the bonding pad and the lead; and
an adhering interface having a nanoparticulate structure disposed between each of the plurality of wire loops and at least one of the bonding pad and the lead,
wherein the adhering interface has a grain size of 250 nm or less,
wherein the adhering interface has pores that range in size between about 50 nm to about 500 nm, and
wherein the nanoparticulate structure is a localized consolidation of metal nanoparticles of a metal nanoparticle composition, and wherein the metal nanoparticle composition is disposed over a region of the bonding pod and includes localized consolidation of metal nanoparticles in the metal nanoparticle composition for each location in the region where contact between one of the plurality of wire loops and the bonding pad exist.

2. The electrical package of claim 1 , wherein the adhering interface is present between the plurality of wire loops and both the bonding pad and the lead.

3. The electrical package of claim 1 , wherein each of the plurality of wire loops comprises a copper wire, a gold wire, an aluminum wire, a silver wire, carbon nanotube ropes, a drawn carbon nanotube fiber, or any combination thereof.

4. The electrical package of claim 1 , wherein the adhering interface is formed from a copper nanoparticle composition.

5. The electrical package of claim 1 , wherein each of the plurality of wire loops comprises a copper wire and the adhering interface is formed from a copper nanoparticle composition.

6. The electrical package of claim 1 , wherein the lead is disposed on the electronic component.

7. The electrical package of claim 1 , wherein each of the plurality of wire loops forms an angle of less than 45 degrees with the bonding pad or lead.

8. The electrical package of claim 7 , wherein each of the plurality of wire loops forms an angle of less than 30 degrees with the bonding pad or lead.

9. The electrical package of claim 1 , wherein the adhering interface has a grain size ranging between 50 nm and 200 nm.

10. The electrical package of claim 1 , wherein the adhering interface has a porosity ranging between 2% and 30%.

11. A wire bonding system comprising:
a rolled wire source;
a dispensation head configured to provide a wire payout from the rolled wire source; and
an applicator configured to place a metal nanoparticle composition upon at least a portion of the wire payout.

12. The wire bonding system of claim 11 , further comprising:
a heat source configured to heat the metal nanoparticle composition upon the wire payout or upon a bonding pad.

13. The wire bonding system of claim 12 , wherein the heat source is an electric arc, a laser, direct radiant heating, heated gas, or photolytic heating.

14. The wire bonding system of claim 11 , wherein the dispensation head is a piezoelectric tweezer bonding head or a capillary bonding head.

Assignees

• Lockheed Corp

Inventors

• Stoltenberg Randall Mark
• Zinn Alfred A

Classifications

• H10W72/5524

  comprising aluminium [Al] · CPC title

• H10W72/522

  Multilayered bond wires, e.g. having a coating concentric around a core · CPC title

• H10W72/5522

  comprising gold [Au] · CPC title

• H10W72/5445

  being orthogonal to a side surface of the chip, e.g. parallel arrangements · CPC title

• H10W72/537

  Multiple bond wires having different shapes · CPC title