Soluble fluorinated cycloalkane sulfonate surfactant additives for NH.sub.4
US4620934A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 13, 1985 |
| Grant date | Nov 4, 1986 |
| Priority date | — |
| Expiry date | May 13, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01L21/31111
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Silicon dioxide etching solutions with soluble surfactant additives are provided. The improved silicon dioxide etchants are produced by adding soluble fluorinated surfactant additives to standard oxide etchants in the manufacture of integrated circuits. The surfactants found effective in accordance with the invention are referred to as fluorinated cycloalkane sulfonates and fluorinated cycloalkene sulfonates and have the general formula ##STR1## where X is F, H, Cl, OH, SO.sub.3 A or R and Y is F, H, OH, R or be omitted and thereby impart a double bond; wherein R is a 1 to 4 fluoroalkyl group; and wherein n has a value of up to 6. A represents as the cation group may be NH.sub.4.sup.+, H.sup.+, Na.sup.+, K.sup.+, Li.sup.+, R.sup.+ or organic amine cations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.