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We fabricated an indium tin oxide (ITO)/Ga₂O₃/Ag/Ga₂O₃ multilayer as a transparent conductive electrode for ultraviolet light-emitting diodes (UV LEDs). The electrical and optical properties of the multilayer were improved by optimizing the annealing temperature of the ITO contact layer and the whole ITO/Ga₂O₃/Ag/Ga₂O₃ multilayer, and the thickness of the ITO contact layer and Ag metal layer. After optimization, the sheet resistance and transmittance of the ITO/Ga₂O₃/Ag/Ga₂O₃ multilayer was 3.43 Ω/sq and 86.4% at 335 nm, respectively. The ITO/Ga₂O₃/Ag/Ga₂O₃ multilayer also exhibited a good ohmic contact characteristic with a specific contact resistance of 1.45×10 -3 Ω·cm². These results show that the proposed ITO/Ga₂O₃/Ag/Ga₂O₃ multilayer is a promising alternative as a p -type electrode for UV LEDs.

Electrical and Optical Properties of a Transparent Conductive ITO/Ga2O3/Ag/Ga2O3 Multilayer for Ultraviolet Light-Emitting Diodes