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Bubbler

Bubbler - (Liquid chlorosilane bubbler saturator)

Run-to-run thickness uniformity often is an issue for epitaxial reactors.
Since it is primarily affected by the way silicon is controlled and distributed, usually it does not greatly depend on reactor design.
However, especially for single-wafer reactors, run-to-run thickness uniformity makes reactor performance much worse than expected.


LPE has developed a tool to significantly improve this key factor.
This patent tool, nicknamed
Bubbler, has been widely tested on LPE reactors and on reactors of other makes, both batch and single-wafer type.

The
Bubbler cylinder is filled with liquid Chlorosilane to about 70%, while the remaining space is the expansion space for overlying vapor.

During deposition, liquid level changes a few centimeters, so that carrier gas saturation and mixture ratio suffer negligible changes.
Higher stability of liquid temperature is given by a large heat-exchange surface and by a water jacket.
Usual water temperature ranges 18 to 25°C.
Correct temperature values depend on specific process requirements.
LPE Thermal Regulator has been specifically design for a high precision water temperature control that ensure a stable temperature of the bubbler.
Therefore, for a given set-point, the relevant silicon amount delivered to reactor is extremely constant.

For further care, liquid Chlorosilane is not refilled during deposition or vent step, but is controlled by a purge valve of reactor (usually the hydrogen purge valve) through the
Control Box, so as to prevent prejudicing saturation parameters during deposition.
All this ensures higher, time-tested process reliability.

For addtional info follow this link: Bubbler brochure.



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