Manufacturing method of semiconductor devices
US6291300A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 13, 2000 |
| Grant date | Sep 18, 2001 |
| Priority date | — |
| Expiry date | Sep 13, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01L21/76224
- WIPO fieldSemiconductors
- WIPO sectorElectrical engineering
Abstract
An element isolation method of a semiconductor device comprises the steps of forming an oxide film on a semiconductor substrate; forming a nitride film on the oxide film; forming an isolation trench on the semiconductor device, the isolation trench being formed through the nitride film and oxide film; forming an oxide insulation layer on the semiconductor substrate to fill the isolation trench and cover the nitride film; flattening the surface of the semiconductor substrate to expose the nitride film by removing a surface portion of the oxide insulation layer in the isolation trench and the oxide insulation layer on the nitride film; heating the flattened semiconductor substrate in a nitrogen-containing gas atmosphere under reduced pressure to form an oxy-nitride film at an interface between an inside wall of the isolation trench and the oxide insulation layer in the isolation trench; and removing the nitride film and the oxide film on the semiconductor substrate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.