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#materials

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01 ·Supply Chain·★ MEMBER·13 min read Upstream of Semiconductors — Wafers, Photoresist, and Specialty Gases How sand becomes silicon that is 99.999999999% pure, gets pulled out of a melt as one giant single crystal, and is coated with a film that dissolves where light hits it. From segregation in the Czochralski process to acid blur in chemically amplified resist — and why a handful of Japanese firms still own this layer.