Complex sentence: Polycrystalline silicon or polysilicon or poly-Si or simply poly (in context) is a material consisting of multiple small silicon crystals, and has long been used as the conducting gate material in MOSFET and CMOS processing technologies.
Split into simpler sentences: Polycrystalline silicon or polysilicon or poly-Si or simply poly (in context) is a material consisting of multiple small silicon crystals. At the component level, polysilicon has long been used as the conducting gate material in MOSFET and CMOS processing technologies.