Typically, before it is made, the constituent materials need to be purified through zone refining.  Its physical properties stem from the fact that when its two parts are brought together, the chemical potentials must equalize. In the past, it was often made by heating a substrate in the presence of a dopant gas, but today epitaxial growth and ion implantation are popular methods of creating it. Three of them make a thyristor, two make a transistor, and one of them makes
Typically, before it is made, the constituent materials need to be purified through zone refining.  Its physical properties stem from the fact that when its two parts are brought together, the chemical potentials must equalize. In the past, it was often made by heating a substrate in the presence of a dopant gas, but today epitaxial growth and ion implantation are popular methods of creating it. Three of them make a thyristor, two make a transistor, and one of them makes a diode.  FTP, Name this basic component of semiconductor circuit elements which is created by joining two differently doped pieces of semiconductor material.
Typically, before it is made, the constituent materials need to be purified through zone refining.  
PN junction (prompt on "diode" before "three of them")