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. 2015 Jun 25;6:7383. doi: 10.1038/ncomms8383

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(a,b) Cross-sectional (a) and top-view (b) scanning electron miscroscope micrographs of the CH₃NH₃PbI₃ thin film. Scale bars, 1 μm. (c) X-ray diffraction pattern of CH₃NH₃PbI₃ film on SiO₂/Si(p++) substrate, confirming the tetragonal structure of the perovskite and space group I4/mcm. (d) Schematic of the bottom-gate, bottom contact LE-FET configuration used in this study.