GT Advanced Technologies Inc. manufactures materials and crystal growth equipment for solar, light emitting diode (LED), electronics, and optics industries. The company offers polysilicon technologies and equipment including polysilicon processing systems; filament production systems; SDR reactors; and trichlorosilane (TCS) and silane. It also provides silicon crystal growth equipment such as DSS Casting furnaces and HiCz monocrystalline furnaces. In addition, the company offers sapphire crystal growth equipment including advanced sapphire furnace (ASF). Further, it provides advanced sapphire materials such as HEM Ti:Sapphire, low absorption optical sapphire (LAOS), and HEM sapphire. Furthermore, the company offers silicon carbide crystal growth equipment including Siclone 100. It sells its equipment and provides services to polysilicon producers, solar wafer manufacturers, and sapphire producers through direct sales force and indirect sales representatives. The company was formerly known as GT Solar International, Inc. and changed its name to GT Advanced Technologies Inc. in August 2011. GT Advanced Technologies Inc. was founded in 1994 and is based in Merrimack, New Hampshire. As of November 1, 2021, GT Advanced Technologies Inc. operates as a subsidiary of Semiconductor Components Industries, LLC.