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. 2019 Jan 11;10:138. doi: 10.1038/s41467-018-07860-0

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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. 2 — Long-wavelength infrared response. a Position-dependent photovoltage with the laser spot moved from the middle of STO to the right Ag electrode. The dashed line indicates the STO/Ag interface. b Current-voltage (I-V) curves in the dark and with laser illuminating the right interface. c Temporal response with the laser spot positioned on the right STO/Ag interface (R-interface) and left one (L-interface). d Enlargement of c to illustrate the response times. The rise/fall time is 1.52/1.52 s for the R-interface illumination, and 1.14/1.19 s for the L-interface illumination. e Dependence of photovoltage and response time on the laser power. The red line is the linear fit to the data, and obtained R² is 0.998. f Responsivity as a function of incident wavelength. The laser wavelength (λ) in panels a–e is 10.57 μm. The laser power in a–d is 11.6 mW. The illumination position in e, f is at the right STO/Ag interface. The laser spot is about 30 μm