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- W2946688422 abstract "Abstract Studying defect formation and evolution in MethylAmmonium lead Iodide (MAPbI 3 ) perovskite layers has a bottleneck in the softness of the matter and in its consequent sensitivity to external solicitations. Here we report that, in a polycrystalline MAPbI 3 layer, Pb-related defects aggregate into nanoclusters preferentially at the triple grain boundaries as unveiled by Transmission Electron Microscopy (TEM) analyses at low total electron dose. Pb-clusters are killer against MAPbI 3 integrity since they progressively feed up the hosting matrix. This progression is limited by the concomitant but slower transformation of the MAPbI 3 core to fragmented and interconnected nano-grains of 6H-PbI 2 that are structurally linked to the mother grain as in strain-relaxed heteroepitaxial coupling. The phenomenon occurs more frequently under TEM degradation whilst air degradation is more prone to leave uncorrelated [001]-oriented 2H-PbI 2 grains as statistically found by X-Ray Diffraction. This path is kinetically costlier but thermodynamically favoured and is easily activated by catalytic species." @default.
- W2946688422 created "2019-05-29" @default.
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- W2946688422 date "2019-05-16" @default.
- W2946688422 modified "2023-10-14" @default.
- W2946688422 title "Pb clustering and PbI2 nanofragmentation during methylammonium lead iodide perovskite degradation" @default.
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- W2946688422 doi "https://doi.org/10.1038/s41467-019-09909-0" @default.
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