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. 2021 Jun 9;10:123. doi: 10.1038/s41377-021-00551-4

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© The Author(s) 2021

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. 4 — a A high-speed G-Si PD with p-i-n doping distributions for both Si and graphene. b A Si-G plasmonic Schottky photodetector. c A MoTe₂-G heterostructure PD. d A G-hBN-G heterostructure PD. Figures reproduced with permissions from: a ref. ¹²², ^©2018 Springer Nature Limited, under Creative Commons Attribution 4.0 International license (CC BY 4.0, https://creativecommons.org/licenses/by/4.0/); b ref. ⁹⁹, ^©2016 American Chemical Society; c ref. ⁹⁰, ^©2020 Springer Nature Limited; d ref. ¹²³; ^©2019 The Optical Society, under Creative Commons Attribution 4.0 International license (CC BY 4.0, https://creativecommons.org/licenses/by/4.0/). Further permissions related to the figures should be directed to the copyright holders.