Patent · US Expired

Method for etching silicon nitride

US4857140A · kind A · utility

218Cited by
4References
55Claims
0Family size

Assignee

Inventor

Key dates

Filing dateMar 31, 1988
Grant dateAug 15, 1989
Priority date
Expiry dateMar 31, 2008

Classification

  • Technology area (CPC H)Electricity
  • CPC primaryH01L21/31116
  • WIPO fieldSemiconductors
  • WIPO sectorElectrical engineering

Abstract

A process for etching silicon nitride which utilizes free radicals from a remote plasma generated using a fluorine containing gas; and hydrogen; to produce an etch which is selective to selected materials, for example, silicon and silicon dioxide.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.