PRE-PRECIPITATION OF PHOSPHORUS IN HEAVILY DOPED SILICON

Abstract
Presently, silicon device technology phosphorous diffusions with high surface concentrations are commonly used for the formation of the emitter areas. Annealing treatments at or below 800°C have been shown to lead to the formation of extrinsic dislocation loops in such areas. A transmission electron microscopic investigation combined with resistivity measurements and profile determinations leads to the interpretation of these loops as a primary step of phosphorous precipitation in the supersaturated lattice.

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