Fishing – trapping – and vermin destroying
Patent
1994-09-12
1995-09-26
Fourson, George
Fishing, trapping, and vermin destroying
H01L 2176
Patent
active
054533970
ABSTRACT:
A method of manufacturing a semiconductor device capable of isolating fine pattern elements by using LOCOS. The method includes the steps of: (a) forming a relatively thick first nitride film pattern on the surface of a semiconductor substrate having an oxide film; (b) wet-etching the oxide film by using the first nitride film as a mask; (c) filling the under-etch region of the first nitride film with nitride and forming a second nitride film thinner than the first nitride film on the exposed surface of the semiconductor substrate; (d) thermally oxidizing all the exposed second nitride film in a dry oxygen atmosphere to form an oxide film on the surface of the semiconductor substrate at least at the region not covered with tile first nitride film; and (e) forming a thermal oxide film on the semiconductor substrate not covered with the first nitride film at a temperature lower than the oxidation temperature at the step (d).
REFERENCES:
patent: 4295266 (1981-10-01), Hsu
patent: 5151381 (1992-09-01), Liu et al.
patent: 5254494 (1993-10-01), Van der Plas et al.
patent: 5369052 (1994-11-01), Kenkare et al.
Pfiester, J., et al, "Nitride Clad LOCOS Isolation for 0.25 Mu CMOS", 1993 Symposium on VLSI Tech.; Digest of Technical Papers, May 1993, pp. 139-140.
Ema Taiji
Katayama Masaya
Fourson George
Fujitsu Limited
Fujitsu VLSI Limited
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