Improvement for the performance of solar-blind photodetector based on β- Ga 2 O 3 thin films by doping Zn

Highly oriented ( 2 ¯ 0 1 ) Ga 2− x Zn x O 3 thin films with different doping concentrations were grown on (0 0 0 1) sapphire substrates by laser molecular beam epitaxy technology. The expansion of lattice and the shrinkage of band gap with increasing doping level confirms the chemical substitution of Zn 2+ ions into the Ga 2 O 3 crystal lattice. The emission intensity of blue-violet emission bands enhanced with the increase of (ZnGa)′ under 254 nm ultraviolet excitation, and the maximum was obtained at x = 0.8. A metal–semiconductor–metal structured solar-blind photodetector based on Ga 2− x Zn x O 3 ( x = 0, 0.8) was made, the increasing responsivity and diminishing relaxation time constants for β -Ga 2− x Zn x O 3 ( x = 0.8) photodetector were observed with 254 nm ultraviolet illumination.