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MeA-PbX3 and MeA-PbI2X (where MeA=CH3NH3; X=I, Br, Cl) systems have been synthesized using grinding processing. Plainly, the crystal structures of the perovskite materials were altered with the variation of the halide ions. Meanwhile, the band gap energy was enhanced from 1.5eV for MeA-PbI3 to 2.1 and 2.8eV for MeA-PbBr3 and MeA-PbCl3 as a result of substitution by halide Br and Cl, respectively....
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