Claims
- 1. A method for forming a conductive bump, comprising the steps of:providing a substrate having a bond pad disposed thereon; disposing a soldering composition over the bond pad, wherein the soldering composition consists essentially of: an alloy of tin (Sn); a fluxing composition comprising: a fluxing agent, wherein the fluxing agent is an aromatic carboxylic acid derivative; and a polymeric solvent; and reflowing the soldering composition to form the conductive bump.
- 2. The method of claim 1, wherein the step of providing the substrate includes providing a semiconductor wafer as the substrate.
- 3. The method of claim 2, wherein the step of providing the semiconductor wafer includes providing a silicon semiconductor wafer as the substrate.
- 4. The method of claim 3, wherein the step of providing the substrate further includes providing an underbump metallization layer over the bond pad, wherein the underbump metallization layer is disposed between the bond pad and the soldering composition.
- 5. The method of claim 1, further including the step of cleaning the conductive bump.
- 6. The method of claim 1, wherein the step of disposing the soldering composition includes disposing the soldering composition which comprises from 1 to 50 weight percent 4-hydroxybenzoic acid, from 0 to 40 weight percent polyethylene glycol, from 2 to 99 weight percent polypropylene glycol butyl ether, and from 0 to 30 weight percent adipic acid.
- 7. The method of claim 6, wherein the soldering composition comprises approximately 17 weight percent 4-hydroxybenzoic acid, approximately 11.9 weight percent polyethylene glycol, where n=20, approximately 65.4 weight percent polypropylene glycol butyl ether, where n=65, and approximately 5.7 weight percent adipic acid.
Parent Case Info
This application is a divisional application of U.S. patent application Ser. No. 09/323,464 filed Jun. 1, 1999 now U.S. Pat. No. 6,451,127.
US Referenced Citations (30)
Foreign Referenced Citations (2)
Number |
Date |
Country |
60-044533 |
Mar 1985 |
JP |
08-143792 |
Jun 1996 |
JP |