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. 2016 Oct 27;6:35994. doi: 10.1038/srep35994

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Copyright © 2016, The Author(s)

This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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(a) UV-Vis absorbance and (b) Time-resolved photoluminescence (TRPL) spectra of perovskite layers on quartz, taken at peak emission wavelength (770 nm), excited at 670 nm (1 MHz) from perovskite side. Black, red and blue colors represent perovskite, MAPbI₃, with PbI₂, pure perovskite, MAPbI₃, without PbI₂ and pure perovskite, (MA)_x(FA)_1−xPbI_3, without PbI₂, respectively. As for pure MAPbI₃ and (MA)_x(FA)_1−xPbI₃ without PbI₂, 10 mg·ml⁻¹ of MAI solution and 8 + 2 mg·ml⁻¹ of MAI + FAI mixed solution were utilized for printing process, respectively.