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. 2019 Apr 3;9:5553. doi: 10.1038/s41598-019-42060-w

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© The Author(s) 2019

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(a) Band diagram of a ZnO-Cu_xO heterojunction under UV illumination, (b) Current-voltage characteristics under dark (black dots), 405 nm UV illumination (magenta dots) and 365 nm UV illumination (purple stars), Current-time characteristic under (c) 405 nm UV illumination and (d) 365 nm UV illumination of a n-p ZnO-Cu_xO diode.