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. 2020 Oct 29;10:18690. doi: 10.1038/s41598-020-74963-4

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Current–voltage characteristics of a single (a) CuO nanowire, (b) CuO–ZnO_1 and (c) CuO–ZnO_2 core shell nanowire, under dark (black squares) and under illumination at 635 nm (red stars), 520 nm (turquoise hexagons) and 405 nm (magenta triangles) wavelengths. Current–time characteristic at (d) 520 nm and (e) 405 nm (at different applied power) of a p–n CuO–ZnO_2 diode. (f) Photocurrent as a function of the input laser power at 405 nm and 3 V bias voltage for the p–n CuO–ZnO_2 diode. Insets: (c) schematic representations of the band diagram CuO–ZnO heterojunction and (d) the contacted single CuO–ZnO core–shell nanowire under illumination.