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By default Wet Thermal Oxidation is grown on both sides of the wafer. Wet oxide is used when a thicker oxide layer is required.
The Oxide layer is a thermally grown SiO2 layer, grown by actually oxidizing the Silicon atoms on the Silicon wafer surface. WET Thermal Oxide, grown with the help of wafer vapor, yields Oxide layer thickness from from 0.12 to to 10µm on special order. DRY Thermal Oxide, grown in the absence of wafer vapor, yields a more dense Oxide layer but only layers from 10 to 300nm are practical. Chlorinated DRY Thermal Oxide is grown with the exclusion of wafer and any hydrocarbon contaminants. It is the ultimate electrical insulator. 10 to 300nm is possible.
The quality of the thicker oxide should be the same as Dry Thermal Oxidiation.
There are other SiO2 layers deposited (rather than grown) on Silicon wafers, by CVD or sputtering or Electron Beam Evaporation. These have other morphological properties, but none of them are as uniform and dense as Thermal Oxide, and they are not used in MOSFET manufacture.
We provide wet thermal oxide thicknesses up to 20um. Thicker oxide layers is great for Silicon on Insulator (SO) wave guides technoology.
Thick Thermal Oxide is also widely used in the Chemical Mechanical Polishing (CMP) industry. Our 4um -6um Thermal Oxide on silicon wafers has been perfected as a consumable for breaking in CMP tools and polishing pads. These Silicon wafers can be reclaimed after use by stripping and re-growing the Thermal Oxide layer providing maximum material utilization.
Fast leadtimes and small quantities is what we specialize in, but larger volumes are no problem!
Unlike wet thermal oxide, dry thermal oxide can be grown on just one side of the wafer. The oxide is optimized for wafers requiring minimal thermal processing. Dry thermal oxide s often used during the semiconductor manufacturing process to form intra-metal dielectric stacks. Dry oxide is also used in MEMS and surface micro-machining processes. Our PECVD oxide films offer you greater process flexibility and can be combined with many of our other films including PECVD nitride, LPCVD nitride, and PVD metals.