Ultra High Purity Liquid Delivery Systems
Liquid Source Media in Semiconductor and Photovoltaic Manufacturing
Numerous semiconductor and photovoltaic manufacturing processes use source media available only in liquid phase. Sourcing and distribution systems for a safe and fully automated supply of processes with UHP liquid chemicals are part of our SVDeli product line. The key elements which guarantee safety, reliability, and ease of handling have been specially developed for UHP liquids.
Liquid Sourcing Systems
Liquid sourcing systems are available in many configurations, typically as either single or dual container cabinets customized for any proprietary canister type used by any vendor of liquid chemicals.
Sourcing systems provide liquid pressurized with suitable push gas charged to the headspace above the liquid in the container. Depending on the application, optional degasification may be required to remove diluted push gas from the liquid. Buffer tanks and Liquid VMBs can be deployed to distribute the liquid according to manufacturing needs.
Conversion Techniques
Various techniques were developed for conversion of the liquid into usable vapor by tool manufacturers. SVCS applies three major ones in their line of diffusion and CVD furnaces.
Bubbler is based on liquid vapor pickup by flowing carrier gas through the liquid. The flow of carrier gas is precisely controlled by a mass flow controller and is introduced to the liquid container through a dip tube while a carrier gas and vapor mixture leaves the container through a separate top outlet. In order to maintain the same pickup rate during the whole process and from process to process, liquid media temperature has to be precisely controlled.
A proprietary powerful combined heating/cooling engine for a dry bath environment has been developed for this purpose.