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Issue 18, 2018
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Synthesis of submillimeter SnSexS2−x (0 < x < 1) two-dimensional alloy and photoinduced reversible transformation between Schottky and Ohmic contact behaviors in devices

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Abstract

The large-scale controllable synthesis of high-quality alloyed semiconductors with a precise composition and electronic modulation is of great importance for their application in electronics and optoelectronics. Here, we demonstrate the direct synthesis of two-dimensional SnSexS2−x alloy via the chemical vapor deposition (CVD) technique. The size of single-crystal flakes could reach up to 750 μm, ten times larger than the previously reported CVD grown SnS2 and SnSe2. The morphology of the atmospheric pressure CVD grown SnSexS2−x flakes revealed an evolution from semi-hexagon to semi-circle as the content of Se atoms increased, while the low-pressure CVD alloyed flakes kept a constant semi-hexagon shape. UV-visible spectroscopy and PL measurement revealed adjustability of bands in the alloy flakes, where a higher Se atom content caused a narrower band gap. The SnSexS2−x devices demonstrated a high Ilight/Idark ratio under switching between light and dark, whose rise and fall times were just 225.9 μs and 646.2 μs, respectively. More importantly, the devices showed Schottky-contact behaviour under dark conditions, which changed to Ohmic under illumination, leading to a tunable Ilight/Idark ratio controlled by the bias voltage between drain and source electrodes. This work helps the large-area growth technique and unique electrical property improvement of two-dimensional alloys to get closer to practical applications.

Graphical abstract: Synthesis of submillimeter SnSexS2−x (0 < x < 1) two-dimensional alloy and photoinduced reversible transformation between Schottky and Ohmic contact behaviors in devices

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Publication details

The article was received on 27 Dec 2017, accepted on 10 Apr 2018 and first published on 13 Apr 2018


Article type: Paper
DOI: 10.1039/C7TC05936A
Citation: J. Mater. Chem. C, 2018,6, 4985-4993
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    Synthesis of submillimeter SnSexS2−x (0 < x < 1) two-dimensional alloy and photoinduced reversible transformation between Schottky and Ohmic contact behaviors in devices

    Y. Li, W. Xiao, G. Chen, H. Dong, X. Wang, T. Feng, L. Huang and J. Li, J. Mater. Chem. C, 2018, 6, 4985
    DOI: 10.1039/C7TC05936A

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