GT Advanced Technologies Inc fka GTAT

[Netsurfer]

As of early 2013 GT was not involved with graphene.
They were one of the largest consumers of grahite though and that may be the source of the confusion. They used ISO molded graphite , molded / extruded graphite for various machined components in the hot zone and a lot of soft carbon felt and rigid graphite insulation..again in the hot zone.

As someone mentioned they were heavily involved with Silicon Carbide but always one step behind Cree in what sizes they could make.Six inch diameter wafers are now available from Cree and Cree has 8" in process I think. GT has just successfully made 4" wafers with six in development. They cannot buy 6" seeds for process development. The wafers are only sold to chip makers and seeds are a violation of the PO terms.

As with Silicon the economies of scale go up fast as the diameter increases.