Etching of tantalum silicide/doped polysilicon structures
US4411734A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 9, 1982 |
| Grant date | Oct 25, 1983 |
| Priority date | — |
| Expiry date | Dec 9, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01L21/32137
- WIPO fieldSemiconductors
- WIPO sectorElectrical engineering
Abstract
A method of forming and anisotropically etching a structure on a substrate, said structure being comprised of a layer of doped polycrystalline silicon having thereover a layer of tantalum silicide. The method comprises providing a layer of polycrystalline silicon on the substrate, doping the silicon to render it conductive, preparing the surface of the silicon for deposition of tantalum silicide by treatment with a carbon tetrafluoride/oxygen plasma, depositing tantalum silicide thereon tantalum rich, anisotropically plasma etching the two-layered structure with an etchant mixture of carbon tetrachloride, oxygen and nitrogen, annealing the tantalum silicide layer and, if desired, covering the resultant structure with a protective layer of oxide. In a preferred embodiment, the silicon layer is deposited in the amorphorus state and annealed to the polycrystalline state.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.