Experimental study demonstrates high-responsivity solar-blind deep ultraviolet detection in beta-gallium oxide photodetectors, highlighting potential for next-generation optical sensors.
In this report, we demonstrate high spectral responsivity (SR) solar blind deep ultraviolet (UV) β-Ga2O3 metal-semiconductor-metal (MSM) photodetectors grown by the mist chemical-vapor deposition (Mist-CVD) method. The β-Ga2O3 thin film was grown on c-plane sapphire substrates, and the fabricated MSM PDs with Al contacts in an interdigitated geometry were found to exhibit peak SR>150A/W for the incident light wavelength of 254 nm at a bias of 20 V. The devices exhibited very low dark current, about 14 pA at 20 V, and showed sharp transients with a photo-to-dark current ratio>105. The corresponding external quantum efficiency is over 7 × 104%. The excellent deep UV β-Ga2O3 photodetectors will enable significant advancements for the next-generation photodetection applications.
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Xu et al. (2018) studied this question.
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