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Van der Waals Epitaxial Two-Dimensional CdSxSe(1-x) Semiconductor Alloys with Tunable-Composition and Application to Flexible Optoelectronics

Abstract

Despite the substantial progress in development of two-dimensional (2D) materials from conventional layered crystals, it still remains particular challenge for producing high-quality 2D non-layered semiconductor alloys which may bring in some unique properties and new functions. In this work, the synthesis of well-oriented 2D non-layered CdSxSe(1-x) semiconductor alloy flakes with tunable compositions and optical properties is established. Structural analysis reveals that the 2D non-layered alloys follow an incommensurate van der Waals epitaxial growth pattern. Photoluminescence measurements demonstrate that the 2D alloys have composition-dependent direct bandgaps with the emission peak varying from 1.8 eV to 2.3 eV, coinciding well with the density functional theory calculations. Furthermore, Photodetectors based on the CdSxSe(1-x) flakes exhibit a high photoresponsivity of 703 A/W with the external quantum efficiency of 1.94 × 103 and response time of 39 ms. Flexible devices fabricated on thin mica substrate display good mechanical stability upon repeated bending. This work suggests a facile and general method to produce high-quality 2D non-layered semiconductor alloys for next-generation optoelectronic devices.

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Publication details

The article was received on 10 Jul 2017, accepted on 04 Aug 2017 and first published on 04 Aug 2017


Article type: Paper
DOI: 10.1039/C7NR04968D
Citation: Nanoscale, 2017, Accepted Manuscript
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    Van der Waals Epitaxial Two-Dimensional CdSxSe(1-x) Semiconductor Alloys with Tunable-Composition and Application to Flexible Optoelectronics

    J. Xia, Y. Zhao, L. Wang, X. Li, Y. Gu, H. Cheng and X. Meng, Nanoscale, 2017, Accepted Manuscript , DOI: 10.1039/C7NR04968D

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