摘要:
An offset spacer layer for an LDD ion implantation process is formed by blanket deposition without photolithography and dry etch processes. The offset spacer layer remaining on LDD regions during an ion implantation process prevents a substrate from silicon loss and dosage contamination and has densified characteristics to improve device reliability.
摘要:
An offset spacer layer for an LDD ion implantation process is formed by blanket deposition without photolithography and dry etch processes. The offset spacer layer remaining on LDD regions during an ion implantation process prevents a substrate from silicon loss and dosage contamination and has densified characteristics to improve device reliability.
摘要:
A method for cleaning a silicon wafer by a wet bench method with improved cleaning efficiency and without oxide formation is disclosed. In the method, the wafer may first be cleaned in a first cleaning solution that includes a base or an acid, and then the wafer is rinsed in a second solution that includes DI water and ozone. The ozone concentration in the DI water may be between about 1 ppm and about 20 ppm, and preferably between about 3 ppm and about 10 ppm. A diluted HF cleaning step may be utilized after the ozone/DI water rinsing step to remove any possible oxide formation on the silicon surface before a final rinsing step and drying step.
摘要:
An apparatus and a method for reducing solvent residue in a solvent-type dryer for drying semiconductor wafers have been disclosed. The apparatus is constructed by a tank body, a wafer carrier, an elevator means, a tank cover, a solvent vapor conduit and an exhaust means. The exhaust means is provided for fluid communication with a compartment in the tank cover such that any residual solvent vapor or any organic residue in the compartment left from the wafer drying cycle can be evacuated to a factory exhaust system. The present invention novel method for reducing solvent or organic residue in the dryer can be carried out, after the removal of the dried wafers from the dryer, by evacuating the compartment in the tank cover for a time period of between about 30 sec. and about 300 sec. until all residual solvent vapor or organic residue is evacuated.
摘要:
A method for cleaning a silicon-based substrate in an ammonia-containing solution without incurring any damages to the silicon surface by NH4OH vapor is described. The method can be conducted by first providing a silicon-based substrate that has a silicon surface, then forming a silicon oxide layer of very small thickness, i.e. less than 10 Å, on the silicon surface. The silicon-based substrate can then be cleaned in an ammonia-containing solution without incurring any surface damage to the silicon, i.e. such as the formation of silicon holes. The present invention novel method can be carried out by either adding an additional oxidation tank before the SC-1 cleaning tank, or adding an oxidant to a quick dump rinse tank prior to the SC-1 cleaning process.