Physics of amorphous conducting oxides

The nature of ionic amorphous oxide semiconductors such as In2O3, SnO2 and ZnO is contrasted with covalent amorphous semiconductors such as a-Si. The oxides have s-like conduction bands which leads to smaller effects of disorder, high electron mobilities, ability to move the Fermi level into the conduction band, and a lack of electrical instability due to bond breaking.