The patented Low Temperature SUMO® Source is the best available source for non-valved evaporation of high vapor pressure materials. The SUMO source is comprised of a dual filament heater tailored to a uniquely shaped crucible. The source is operated in hot-lipped mode to prevent flux shadowing and source occlusion caused by material recondensation at the crucible lip. The Low Temperature SUMO Source is enclosed in a heat-shielding package designed for optimal source responsiveness and stability in the operating range of 100–750°C.
Temperature stability is critical with high vapor pressure materials, since even a small temperature variation produces a dramatic change in flux. Heat radiated from the substrate manipulator sometimes makes it difficult to maintain a stable beam flux at very low source operating conditions. Due to the smaller orifice size, this effect is significantly reduced when using a SUMO source in place of a conical or cylindrical crucible.
Patented design with more than 175 in the field Versatile high-performance source for low temperature evaporation Dual filament hot-lip heating to prevent condensation at the crucible orifice SUMO design combines excellent flux stability and uniformity with large charge capacity PBN crucible construction optimizes material quality Ideal source for organic materials.
The unique patented crucible features:
An optional insert is available to restrict the crucible orifice size and thereby increase the back pressure in the crucible. This technique can improve the performance of very high vapor pressure materials, including those used as dopants. The insert is recommended particularly for sources which would be operated at temperatures of 300°C or lower.
Low Temperature SUMO for Organics
The Low Temperature SUMO Source is well-suited for use with the high vapor pressure organic materials commonly used in organic light-emitting diodes (OLEDs) and electronic applications. Due to the low thermal conductivity of organics, stable beam fluxes are difficult to achieve with conventional evaporation sources. A Low Temperature SUMO source is the best solution for stable and uniform deposition of organics. For applications which require a collimated beam to maximize material usage and minimize blow-by, a “longhorn” SUMO crucible is available.
The Low Temperature SUMO Source is precisely tailored to the demands of evaporating high vapor pressure materials.