Self-aligned via and air gap
US9368395B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 6, 2014 |
| Grant date | Jun 14, 2016 |
| Priority date | — |
| Expiry date | May 6, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01L21/76883
- WIPO fieldSemiconductors
- WIPO sectorElectrical engineering
Abstract
Provided are approaches for forming a self-aligned via and an air gap within a semiconductor device. Specifically, one approach produces a device having: a first metal line beneath a second metal line within an ultra low-k (ULK) dielectric, the first metal line connected to the second metal line by a first via; a dielectric capping layer formed over the second metal line; a third metal line within first and second via openings formed within a ULK fill material formed over the dielectric capping layer, wherein the third metal line within the first via opening extends to a top surface of the dielectric capping layer, and wherein the third metal line within the second via opening is connected to the second metal by a second via passing through the dielectric capping layer; and an air gap formed between the third metal line within the first and seconds via openings.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.