High responsivity solar-blind metal-semiconductor-metal photodetector based on alpha-Ga2O3

Abstract

alpha-Ga2O3, with an ultra-high energy bandgap of 5.1 eV, is an attractive material for applications in solar-blind photodetectors and high-power electronics. We fabricated an alpha-Ga2O3 metal-semiconductor-metal (MSM) interdigitated solar-blind photodetector, where an epitaxial alpha-Ga2O3 thin film was grown on a sapphire substrate using a hydride vapor-phase epitaxy technique. Excellent optoelectronic device properties including high responsivity (4.24 x 10(4) A/W), detectivity (1.77 x 10(11) Jones), and external quantum efficiency (2.07 x 10(5)) were demonstrated in response to ultraviolet (UV) C wavelength. Under sunlight, the alpha-Ga2O3 MSM photodetector exhibited stable solar-blind sensitivity to UVC wavelength without interference from the incoming solar spectrum. Our work proposes that alpha-Ga2O3 has great potential as a next-generation high-performance solar-blind photodetector.