Journal
MATERIALS RESEARCH BULLETIN
Volume 119, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.materresbull.2019.110533
Keywords
Strain; Structural and electronic properties; Monolayer tin dioxides and dichalcogenides SnX2 (X=O, S, Se, Te)
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Funding
- Beijing Computational Science Research Center NSAF [U1530401]
- Foundation of the Higher Education Institutions of Jiangsu Province [18KJB140013]
- Research Project of Natural Science Research Foundation of Nantong University [15Z05]
- National Natural Science Foundation of China (NSFC) [11604164, 11747128, 11653005]
- Program for High -Level Talents Introduction in Xizang University [XZDXYJRC2016-003]
- National Incubation Program of Xizang University [ZDCZJH17-06]
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Based on first-principles calculations, we investigate the structural, mechanical and electronic properties of monolayer tin dioxides and dichalcogenides SnX2 (X=O, S, Se, Te) under uniaxial and biaxial strains. Our results show that monolayer 1T-SnX2 is energetically more stable than 2H-SnX2, while the stiffness of 2H-SnX2 is much higher. The unstrained SnX2 is thermodynamically and dynamically more stable than the strained ones. We also show that when external strain is applied, the band gaps of both 2H- and 1T-SnO2 decrease linearly with increasing strain, which is contributed by the strain induced orbital redistribution of the decomposition of the p orbital of X atom and s, p orbitals of Sn atom. Notably, the slope of the band gap variation of the biaxial strained 1T-SnO2 reaches up to -0.16 eV/1%. In our calculations, strain can result in a semiconductor-metal transition of 2H-SnX2, while it only affects the band gap of 1T-SnX2.
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