NEW TRANSPARENT CONDUCTIVE OXIDES WITH YBFE2O4 STRUCTURE

InGaMgO4 and InGaZnO4 crystals with the YbFe2O4 layered structure have been found to be transparent conductive oxides, The band gaps of thes e crystals were wider than that of In2O3. Conductivity was induced by doping with electrons through introduction of oxygen vacancies. Mobili ty carrier density and conductivity of sintered bodies of InGaMgO4 wer e 2 cm(2)/V . s, 1 x 10(18)/cm(3) and 0.5 S/cm. respectively. Those of InCaZnO4 were 20 cm(2)/V . s, 4 x 10(19)/cm(3) and 120 S/cm. A promis ing method to improve the conductivity to a value sufficient for pract ical use is discussed.