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Self-catalyzed VLS Growth of PbSe wires with Significantly Suppressing the VS Process

Abstract

Self-catalyzed growth of PbSe wires was achieved by a physical vapor deposition (PVD) method using pure PbSe powder as the precursor. The growth mechanism was investigated by the contrast experiments through controlling the growth time, the flow rate of the carrier gas and the type of the carrier gas. The self-catalyzed vapor-liquid-solid (VLS) growth process was clearly demonstrated, where Pb particles were firstly deposited on the Si substrate to act as the catalyst for the following PbSe wires growth. Simultaneously, the vapor-solid (VS) growth of PbSe cubes was greatly suppressed with the high flow rate carrier gas (N2+5%H2), while the VLS growth of PbSe wires happened with both the high and the low flow rate carrier gas, by which high quality PbSe wires were obtained with significantly suppressing the VS growing cubes. The different dependence of the VLS and VS growth on the flow rate of the carrier gas can be well understood with the Gibbs-Thomson effect. Mid-infrared (mid-IR) emission of PbSe wires was studied by the temperature-dependent photoluminescence (PL). A strong bandedge emission was observed without obvious defect related emission bands, where the PL spectra showed a red-shift of the peak position from 3960 to 4770 nm with decreasing the temperature from 300 to 80 K. This unique optical properties indicate PbSe wires have potential applications in mid-IR optical and optoelectronic devices.

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Publication details

The article was received on 17 May 2018, accepted on 07 Aug 2018 and first published on 08 Aug 2018


Article type: Paper
DOI: 10.1039/C8CE00817E
Citation: CrystEngComm, 2018, Accepted Manuscript
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    Self-catalyzed VLS Growth of PbSe wires with Significantly Suppressing the VS Process

    C. Fan, X. Xu, Y. Zhang, T. Chen, S. Wang, C. Zhang and Q. Zhang, CrystEngComm, 2018, Accepted Manuscript , DOI: 10.1039/C8CE00817E

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