Profile: ATT Advanced Elemental Materials Co., Ltd offer almost all chemical elements of the periodic table (except radioactive elements) in very different forms and shapes. We supply semiconductors and materials for the production of semiconductors in a wide variety of forms. These include single-crystal and polycrystalline bulk materials, finished semiconductor wafers, organometallic deposition precursors, oxide and ceramic dielectric materials, and numerous types of sputtering targets. Quantum dots are crystalline semiconductor materials with diameters ranging from 2-10 nanometers, making them small enough to exhibit quantum mechanical properties.