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. 2019 Dec 16;10:5724. doi: 10.1038/s41467-019-13388-8

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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. 4 — Photoelectrochemical device and performance. a Schematic energy level alignment. b Cross-sectional HRTEM image of n⁺p-Si/Al₂O₃/AgP₂ hybrid photocathode and c corresponding line scan elemental EDS spectra. Scale bar 5 nm. d j–E curves of as-prepared n⁺p-Si, n⁺p-Si/AgP₂, n⁺p-Si/Al₂O₃, and n⁺p-Si/Al₂O₃/AgP₂ photocathodes under simulated solar illumination (AM-1.5G, 100 mW cm⁻²) in CO₂-saturated 0.5 M KHCO₃ solution. e Faradaic efficiency of CO and H₂ at different potentials for n⁺p-Si/Al₂O₃/AgP₂.