Method of manufacturing a copper interconnect
US6348402B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 16, 2000 |
| Grant date | Feb 19, 2002 |
| Priority date | — |
| Expiry date | Mar 16, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01L2924/0002
- WIPO fieldSemiconductors
- WIPO sectorElectrical engineering
Abstract
A groove or hole is formed in an insulating layer formed on a semiconductor substrate, and a first conductive layer including a first metal element is formed on a surface of the insulating layer. By oxidizing the first conductive layer, an oxide layer of the first metal element is formed on a surface of the first conductive layer. A second conductive layer including a second metal element having a free energy of oxide formation lower than that of the first metal element is deposited thereon. By reducing the oxide layer of the first metal element by the second metal element, an oxide layer of the second metal element is formed at the interface between the first conductive layer and the second conductive layer. Further, an interconnection is buried in the groove or hole of the insulating layer. Thereby, a thin second metal oxide layer having excellent barrier properties against an interconnection material and excellent adhesion to the interconnection material can be selectively formed with a uniform thickness on the surface of the first conductive layer used as a barrier metal layer of the interconnection.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.