A large step towards realization of large-sized wafers
This research produced some of the world's largest crystals by a method that uses gas as the raw material, which makes it easy to scale up the synthesis area. When using the conventional method, the thickness achieved by a single synthesis is limited to the sub-millimeter order, and cracks occur when lamination is performed multiple times to achieve a thick film. To overcome these issues, simulations were conducted to drastically modify the synthesis equipment and review the synthesis conditions. These results enabled to synthesize a thickness of 2 to 5 mm with a single synthesis, and to grow crystals without cracks even when forming a thick film.