Supersaturation, melting, cooling

Retrograde melting is the process of a solid substance turning to liquid as its temperature decreases. The supersaturated wafer precipitated out its metals in liquid form as it cooled. Why is this important? Well, the melting process can be used to remove impurities in silicon-based semiconductors such as solar cells. Read all about it in the advanced materials. Similarly, you can also freeze water by heating it.