GT Advanced Technologies is a technology company producing materials and equipment for consumer electronics, power electronics, solar and light emitting diodes industries. Co. has three segments: polysilicon, photovoltaic (PV), and sapphire. Co.'s polysilicon business manufactures and sells silicon deposition reactors used to react gases at high temperatures to produce polysilicon. Co.'s PV business manufactures and sells directional solidification, crystallization furnaces and ancillary equipment used to cast crystalline silicon ingots by melting and cooling polysilicon in a controlled process. Co.'s sapphire business manufactures and sells sapphire material and sapphire growth equipment.