Journal
MATERIALS TODAY ENERGY
Volume 22, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.mtener.2021.100839
Keywords
2D materials; Piezoelectric; Mechanical; Thermal conductivity; Semiconductor
Funding
- Deutsche Forschungsgemeinschaft under Germany's Excellence Strategy within the Cluster of Excellence PhoenixD (EXC 2122) [390833453]
- Persian Gulf University Research Council
- ERC Starting Grant COTOFLEXI [802205]
- cluster system team at the Leibniz Universitat of Hannover
- European Research Council (ERC) [802205] Funding Source: European Research Council (ERC)
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The study reveals that CrC2N4, MoC2N4, and WC2N4 monolayers are semiconductors with desirable thermal, dynamical, and mechanical stability. CrC2N4 monolayer exhibits excellent absorption of visible light, along with incredibly high elastic modulus and tensile strength.
Experimental realization of single-layer MoSi2N4 is among the latest groundbreaking advances in the field of two-dimensional (2D) materials. Inspired by this accomplishment, herein we conduct first principles calculations to explore the stability of MC2N4 (M = Cr, Mo, W, V, Nb, Ta, Ti, Zr, Hf) mono layers. Acquired results confirm the desirable thermal, dynamical, and mechanical stability of MC2N4 (M = Cr, Mo, W, V) nanosheets. Interestingly, CrC2N4, MoC2N4, and WC2N4 monolayers are found to be semiconductors with band gaps of 2.32, 2.76, and 2.86 eV, respectively, using the HSE06 functional, whereas VC2N4 lattice shows a metallic nature. The direct gap semiconducting nature of the CrC2N4 monolayer results in excellent absorption of visible light. The elastic modulus and tensile strength of the CrC2N4 nanosheet are predicted to be remarkably high, 676 and 54.8 GPa, respectively. On the basis of iterative solutions of the Boltzmann transport equation, the room temperature lattice thermal conductivity of the CrC2N4 monolayer is predicted to be 350 W/mK, among the highest in 2D semiconductors. CrC2N4 and WC2N4 lattices are also found to exhibit outstandingly high piezoelectric coefficients. This study introduces the CrC2N4 nanosheet as a novel 2D semiconductor with outstandingly high mechanical strength, thermal conductivity, carrier mobility, and piezoelectric coefficient. (C) 2021 Elsevier Ltd. All rights reserved.
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