Growth of semiconductor

Wafer manufacturing process

Sand to polycrystal silcon

SiO\(_2\) + 2C \(\rightarrow\) Si + 2CO

We call it metallurgical grade silicon(MGS), and it is polycrystal.

Si + 3HCl \(\rightarrow\) SiHCl\(_3\) + H\(_2\)

2SiHCl\(_3\) + 2H\(_2\) \(\rightarrow\) 2Si + 6HCl

Now, We call it Electronic grade silicon(EGS). But, it is still polycrystal.