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" ... A photoresist is a liquid layer that coats the wafer used in photolithography, the “photographic” process that creates the semiconductor circuits. Intense light is projected through a photomask, which contains the circuit diagrams for the semiconductor, and this causes a reaction in the photoresist that mirrors those diagrams. The exposed parts and the photoresist are removed, leaving the circuit diagram on the silicon wafer. All these steps must be carried out with incredible precision and absolutely pure materials. The slightest contamination could render the semiconductors useless. “We’re talking about the purity levels of parts per trillion,” Ohashi explains. “A photoresist contains resin, a solvent and photo acid generators (PAG) that react to light, and the photoresists we make do not tolerate impurities. It’s not something that can be replicated by other companies, and we are ready for further micronizing trend of the diagram into the 5G age by this purity.” ... "
" ... It wasn’t as though the two governments had come to a permanent resolution of their problems, but Japan’s approval for shipping “extreme ultraviolet photoresist” to Samsung Electronics marked a welcome break in tensions. ... "