Single crystal substrates are highly pure materials with a uniform atomic structure, providing an ideal foundation for the growth of high-quality thin films and semiconductor devices. These substrates are essential in industries such as electronics, optoelectronics, and photonics, where precise material properties and defect-free surfaces are critical. Common materials for single crystal substrates include silicon, sapphire, and gallium nitride, offering superior performance in applications like LED production, solar cells, and integrated circuits.