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Semiconductor Crystal Growth

  

We designed, fabricated, and installed a furnace for production of large UV crystals for use in solar blind optics. The UV crystals are produced by directional solidification (vertical Bridgman) from melt. The end-use requirements impose very stringent conditions on the crystal growth process, particularly on the allowable temperature variations in the crystal during growth as well as cool-down to room temperature. We developed a Simulator for this process, and used the Simulator to optimize the size of various components in the furnace. The result was a six-heater furnace which was then fabricated and installed at our client's facilities. The furnace acceptance tests were completed in the fourth quarter of 2001, and production of UV crystals is planned for the first quarter of 2002. The figures above show the result of simulation output, a close up of the furnace interior, and the installed equipment.

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