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Issue 21, 2018
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Two-step vapor deposition of self-catalyzed large-size PbI2 nanobelts for high-performance photodetectors

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Abstract

The grown lead iodide (PbI2) is usually a two-dimensional sheet with a finite size which necessitates sophisticated device metallization and the growth of quasi one-dimensional materials is still challenging. In this work, large-size (length > 100 μm), single-crystalline and high-density PbI2 nanobelts are successfully synthesized by manipulating the microenvironment in a two-step vapor deposition process at a slow heating rate of ∼18 °C min−1. Firstly, PbI2 nanosheet seeds are grown by physical vapor deposition, and then PbI2 nanobelts are synthesized by a self-catalyzed vapor–liquid–solid growth mechanism, which is verified by the Pb nanoparticles on the nanobelt tips. Photoluminescence and ultraviolet-visible spectra show the uniform high-quality crystallinity of the as-prepared large-size PbI2 nanobelts with a bandgap of 2.36 eV. When configured into photodetectors with a shadow mask, the fabricated device exhibits a low dark current of 4 pA, an impressive ON/OFF current ratio of 103–104, a photoresponsivity of 13 mA W−1, and a fast response with the rise and decay time constants of 425 and 41 ms, respectively. All these performances are comparable to those of state-of-the-art layered PbI2 nanostructure photodetectors, but the ease of synthesizing large-size PbI2 nanobelts may have a useful impact on next-generation easily-fabricated high-performance optoelectronics.

Graphical abstract: Two-step vapor deposition of self-catalyzed large-size PbI2 nanobelts for high-performance photodetectors

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Publication details

The article was received on 10 Mar 2018, accepted on 26 Apr 2018 and first published on 27 Apr 2018


Article type: Paper
DOI: 10.1039/C8TC01180J
Citation: J. Mater. Chem. C, 2018,6, 5746-5753
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    Two-step vapor deposition of self-catalyzed large-size PbI2 nanobelts for high-performance photodetectors

    M. Han, J. Sun, L. Bian, Z. Wang, L. Zhang, Y. Yin, Z. Gao, F. Li, Q. Xin, L. He, N. Han, A. Song and Z. Yang, J. Mater. Chem. C, 2018, 6, 5746
    DOI: 10.1039/C8TC01180J

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