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. 2019 Nov 21;8:106. doi: 10.1038/s41377-019-0218-y

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© The Author(s) 2019

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 license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license 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 license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 3 — a Device I-V curves and b I_ph and R values under an illumination wavelength of 1550 nm. c Noise currents of the heterojunction device, varying with the frequency (0.1 and 1 V). d I_ph and R of the device under an incident wavelength of 980 nm. e Device response speed under an incident wavelength of 1550 nm. The zoomed-in views of the rise and decay versus time correspond to start times of 22.110 and 27.029 s, respectively.