Abstract

Gas immersion laser doping (GILD) is used to fabricate the base and emitter regions of narrow-base n-p-n bipolar transistors. The GILD process is unique in that it allows simple fabrication of box-like impurity profiles which can be placed very accurately in the vertical dimension (+or-100 AA). Transistors with base widths ranging from 700 to 1200 AA and DC forward current gains greater than 50 are fabricated. >

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