Transparent conductive materials (TCM) comprise materials in a group that combine the mutually exclusive properties of transparency (effective transmission of light) and electrical conductivity; these characteristics can be jointly achieved on processing the materials as thin films on transparent substrates. Te history of TCM begins with a report of a transparent and electrically conductive film of cadmium oxide by Karl Bädeker (Bädeker, K. (1907). Ann. Phys. 22: 749). Since that time, material scientists and engineers have devoted much research effort to find new materials – mainly transparent conductive oxides (TCOs)