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. 2017 Oct 13;10(1):5. doi: 10.1007/s40820-017-0159-z

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© The Author(s) 2017

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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.

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Fig. 2 — Energy band diagram of different PN junction photovoltaic devices. a A PN junction solar cell. b A P–I–N solar cell with homogeneous built-in electric field. c CH₃NH₃PbI_3-xCl_x perovskite-based cell with inhomogeneous built-in electric field. (Color figure online)