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Issue 39, 2019
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Comprehensive understanding of intrinsic mobility in the monolayers of III–VI group 2D materials

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Abstract

Monolayers of III–VI group two-dimensional (2D) materials MX (M = Ga and In and X = S, Se, and Te) have attracted global interest for potential applications in electronic and photoelectric devices due to their attractive physical and chemical characteristics. However, a comprehensive understanding of the distinguished carrier mobility in MX monolayers is of great importance and not yet clear. Herein, using a Boltzmann transport equation (BTE) solver and first principles calculations, we have precisely revealed that the intrinsic mobility in MX monolayers is significantly limited by phonon scattering. Note that the longitudinal acoustic phonon mode and optic phonon modes Image ID:c9cp04407h-t1.gif and Image ID:c9cp04407h-t2.gif were found predominantly coupled with electrons, which strongly restrained the intrinsic mobility in the MX monolayers. Interestingly, apart from a moderate band gap, the GaSe and GaTe monolayers exhibit high electron mobility exceeding 103 cm2 V−1 s−1 and may serve as outstanding electron transport channels. We believe that our findings will shed light on the design and applications of MX monolayers and 2D materials in nanoscale electronic and photoelectric devices.

Graphical abstract: Comprehensive understanding of intrinsic mobility in the monolayers of III–VI group 2D materials

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Publication details

The article was received on 08 Aug 2019, accepted on 09 Sep 2019 and first published on 09 Sep 2019


Article type: Paper
DOI: 10.1039/C9CP04407H
Phys. Chem. Chem. Phys., 2019,21, 21898-21907

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    Comprehensive understanding of intrinsic mobility in the monolayers of III–VI group 2D materials

    J. Chen, X. Tan, P. Lin, B. Sa, J. Zhou, Y. Zhang, C. Wen and Z. Sun, Phys. Chem. Chem. Phys., 2019, 21, 21898
    DOI: 10.1039/C9CP04407H

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