[18p-PB3-1~95] 17 Nanocarbon Technology (Poster)

[18p-PB3-43] Fabrication of graphene-Ga₂O₃ Schottky junction for solar-blind photodiode application

〇KALITA GOLAP¹, PRADEEP DESAI¹, AJINKYA RANADE¹, RAKESH MAHYAVANSHI¹, MASAKI TANEMURA¹ (1.Nagoya Inst. Tech.)

Keywords:graphene, gallium oxide

Ultraviolet (UV) photodetectors are key component for various applications in the field of environmental monitoring, flame detection, astronomical studies, digital imaging, short-wave communication and other emerging technologies such as internet-of-things (IoT) sensors. Among, various oxide semiconductors monoclinic beta-gallium oxide (β-Ga₂O₃) with a direct band gap of 4.5-4.9 eV can be suitable for solar-blind UV photodiode applications. Here, we demonstrate formation of a suitable Schottky barrier potential in graphene/β-Ga₂O₃ heterojunction enabling fabrication of a deep-UV photodiode. A photovoltaic action was obtained with an open circuit voltage (V_oc) of 10 mV and short circuit current density of 4.4 (J_sc) µA/cm² for DUV irradiation, attributing to possible self-powered operation of the photodiode. We also observed a bias dependent transient photoresponse for the fabricated device. A faster photoresponse was obtained for self-powered mode of the solar-blind photodiode.