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• W2073611208 abstract "We report the photoluminescence (PL) properties of colloidal Si nanocrystals (NCs) up to 800 K and observe PL retention on par with core/shell structures of other compositions. These alkane-terminated Si NCs even emit at temperatures well above previously reported melting points for oxide-embedded particles. Using selected area electron diffraction (SAED), powder X-ray diffraction (XRD), liquid drop theory, and molecular dynamics (MD) simulations, we show that melting does not play a role at the temperatures explored experimentally in PL, and we observe a phase change to β-SiC in the presence of an electron beam. Loss of diffraction peaks (melting) with recovery of diamond-phase silicon upon cooling is observed under inert atmosphere by XRD. We further show that surface passivation by covalently bound ligands endures the experimental temperatures. These findings point to covalently bound organic ligands as a route to the development of NCs for use in high temperature applications, including concentrated solar cells and electrical lighting." @default.
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• W2073611208 date "2014-09-08" @default.
• W2073611208 modified "2023-10-06" @default.
• W2073611208 title "Silicon Nanocrystals at Elevated Temperatures: Retention of Photoluminescence and Diamond Silicon to β-Silicon Carbide Phase Transition" @default.
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• W2073611208 doi "https://doi.org/10.1021/nn5029967" @default.
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