Pyrochlore oxide Y2Hf2O7 thin films for solar-blind UV detectors

Highly (100) oriented Y 2 Hf 2 O 7 thin films were grown on YSZ substrates by magnetron sputtering. The band-gap of 5.1 eV for the Y 2 Hf 2 O 7 thin film was evaluated by optical transmission spectroscopy. UV photodetectors based on the Y 2 Hf 2 O 7 thin films were fabricated. Excellent photoelectric responses were observed in dark and under illumination by low-pressure mercury lamp, such as photo-current to dark-current ratio of 120,...