【Device Papers】Self-powered wide bandgap UV detector based on CuO/α-Ga₂O₃ heterostructure

      Researchers from the Yili Normal University have published a dissertation titled "Self-powered wide bandgap UV detector based on CuO/α-Ga₂O₃ heterostructure" in Applied Physics A.

Abstract

      CuO nanoparticles were successfully attached to the α-Ga₂O₃ nanoarray/FTO structure using a simple dipping method and re-annealing process. This resulted in the creation of a self-powered photoelectrochemical photodetector based on FTO/α-Ga₂O₃/CuO heterojunction. The photodetector responds to a broader range of wavelengths, including 365 nm ultraviolet light, compared to the FTO/α-Ga₂O₃ structure. The photodetector exhibits an I_photo/I_dark ratio of 0.27 and a photoresponsivity of 0.4 mA·W⁻¹ when exposed to 254 nm deep ultraviolet light. Similarly, when exposed to 365 nm ultraviolet light, the photodetector has an I_photo/I_dark ratio of 1.09 and a photoresponsivity of 0.05 mA·W⁻¹. The photoresponse current I–t curves show clear differences, allowing for effective differentiation between ultraviolet light of different wavelengths (254 nm and 365 nm) in the CuO/α-Ga₂O₃ photodetector.

DOI：

https://doi.org/10.1007/s00339-024-08172-5