ECell^TMAs Arsenic cracker source

ECellAs valved Arsenic effusion source (cracker cell) for molecular beam epitaxy (MBE)

Valved Arsenic effusion source for molecular beam epitaxy (MBE)

The ECell^TMAs valved As effusion source or "cracker cell" is designed for high performance MBE growth of Arsenic-containing III-V materials, offering significant benefits over the thermal control of conventional open sources:

• Optimised control over the growth process using a needle valve for precise, fast flux modulations and complete flux shut-off. The As charge capacity may be indiscriminately large without limiting the responsiveness of the source: whether you are using the 1 l version or the 8.5 l version, As flux responsiveness will be constant.
• Patented valve design provides high sealing capability that allows source to be left continuously at operating temperature without depleting charge material.
• Large crucible capacity, fast and precise flux control, and easy, modular handling for maintenance and crucible refill make the ECellAs equally ideal for production and high-throughput development MBE systems in addition to research reactors.

Key benefits

• 1 l, 3 l and 8.5 l versions to enable your desired throughput and campaign length
• Easy service and crucible change-over
• No need to replace the complete cell or return it for factory service - the reservoir can be individually demounted from the cracker unit for easy on-site maintenance and service, minimising system down-time
• High integrity seal provides complete shut-off of As flux during epitaxial growth when necessary and preserves As charge in reservoir from oxidation during routine maintenance service
• High reliability design
• Valve clogging is prevented by unique patented independent heater design
• Independent gasket-sealed As path from crucible through valve to cracker prevents leaks and As migration
• Easy As recharge
• Heated secondary filling port allows recharge of As without emptying crucible
• Maximum flexibility and compatibility in mounting
• The ECellAs may be fitted to any MBE system via the standard FC64 interface flange and adaptors to match in-vacuum length
• Reservoir heater design directs As condensate away from valve unit, giving complete flexibility in mounting orientation
• Complete automation
• Optional motorised valve provides complete automated control, and interfaces with recipe software