Office for Technology Commercialization

Delivery System for Precursor Gas in Chemical Vapor Deposition (CVD)

Technology #z05074

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Fluidized Bed SublimatorChemical vapor deposition (CVD)Fluidized Bed
Wayne Gladfelter, PhD Department of Chemistry, College of Science and Engineering
Dr. Gladfelter’s current research focuses on dye sensitized zinc oxide nanoparticles, electronic doping of nanocrystals and atomic layer deposition, the controlled layer by layer growth of thin films.
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Larry Micek
Technology Licensing Officer 612-624-9568
Patent Protection

Device For Providing Vapors Of A Solid Precursor To A Processing Device

US Patent Pending 20080268143

Fluidized Bed System for Precursor Delivery in Chemical Vapor Deposition (CVD)

The method for delivering large precursors for chemical vapor deposition (CVD) based on sublimation in a fluidized bed provides more reliable vapor pressure of larger precursor molecules and reduces particle contamination. The fluidized bed consists of either pure precursor or precursor mixed with an inert powder. When operating at a carrier gas flow above the minimum required to fluidize the bed, the system significantly outperforms the current technology such as fixed-bed systems.

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This technology is available via a standard negotiated license agreement. Contact Larry Micek for specific details.

Sublimation of Precursor Gas in the Fluidized Bed

In most CVD processes, the molecular precursor is a gas (e.g. SiH4) or a liquid (e.g. GaMe3) at room temperature. As the size and complexity of the precursor increase, the standard state at ambient conditions is solid. This leads to three problems: first the equilibrium vapor pressure is low; second is the difficulty in maintaining reproducible precursor gas pressure and third is a higher instance of particle contamination. The fluidized bed based system overcomes these issues.


  • Reliable vapor pressure of larger precursor molecules
  • Reduced particle contamination
  • Outperforms fixed-bed systems