Journal
NANO LETTERS
Volume 19, Issue 12, Pages 8724-8731Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.9b03425
Keywords
2D materials; transition metal dichalcogenides; superlattices; strain relaxation
Ask authors/readers for more resources
Two-dimensional (2D) superlattices composed of chemically heterogeneous transition-metal dichalcogenides (TMDs) have been proposed as key components in next-generation optoelectronic devices. For potential applications, coherent, defect-free compositional interfaces are usually required. In this paper, a combination of scaling theory and numerical analysis is employed to investigate strain relaxation mechanisms in misfitting, chemically heterogeneous TMDs. We demonstrate that, in free-standing superlattices, wrinkling of the monolayer is asymptotically preferred over misfit dislocation formation in both binary and ternary superlattices. For substrate-supported monolayers, however, misfit dislocation formation is thermodynamically favored above a critical superlattice width, implying the presence of an upper limit to the thermodynamic stability of coherent, misfitting 2D superlattices. Finally, it is shown numerically that the critical superlattice width is only weakly dependent on the misfit.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available