Optical properties of sputtered hexagonal CdZnO films with band gap energies from 1.8 to 3.3eV
摘要:
CdxZn1-xO films in a wide range of Cd contents have been grown by reactive direct-current magnetron sputtering. At x <= 0.66, the sputtered CdxZn1-xO films are of single hexagonal phase. The optical band gap energies of the CdxZn1-xO films decrease from similar to 3.3 eV at x = 0 to similar to 1.8 eV at x = 0.66. Correspondingly, the near-band-edge photoluminescence is tuned in a wide visible region from similar to 378 to 678 nm. Moreover, the ultraviolet irradiation enhanced PL from the CdxZn1-xO films has been observed. (C) 2011 Elsevier B.V. All rights reserved.