Patent
1988-05-17
1989-10-17
Wojciecnowicz, Edward J.
357 59, 357 63, 357 89, 357 90, H01L 2972
Patent
active
048750859
ABSTRACT:
A method of forming a shallow n-type region of a semiconductor device such as a bipolar transistor and a MOS FET, including the steps of: forming a first film containing arsenic or antimony on a silicon substrate; forming a second film containing phosphorus on the first film; and diffusing the arsenic or antimony and the phosphorus into the semiconductor substrate out of the first and second films by heat-treatment. The diffused impurities of the arsenic or antimony and the phosphorus form the n-type region and the arsenic or antimony defines the depth of the n-type region.
REFERENCES:
patent: 4379726 (1983-04-01), Kumamaru et al.
patent: 4419810 (1983-12-01), Riseman
patent: 4542580 (1985-09-01), Delivorias
patent: 4549199 (1985-10-01), Yamauchi et al.
Hataishi Osamu
Ueno Katsunobu
Fujitsu Limited
Wojciecnowicz Edward J.
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