Silicon material in the form of a large single crystal, used for the manufacture of silicon-based semiconductor devices. Silicon in its natural state is an aggregate of different crystals, with random crystal lattice orientations, that are fused together. The boundaries between these crystals produce unwanted electrical effects, similar to those caused by impurities, that prevent the correct operation of semiconductor devices. An annealing process is used bring all the crystals to the same orientation and to fuse them uniformly together.