Scientific Achievement
The symmetry and thus the optical response of stacked 2D WSe2 crystals are shown to becontrolled by the type of screw dislocations.
Significance and Impact
Understanding the correlation between growth parameters (which determine the type of screw dislocations) and optical behavior will lead to materials for advanced optoelectronic applications.
Research Details
– Different classes of dislocation-driven crystal nanoplates were grown by chemical vapor deposition.
– The stacking configurations were understood using a combination of theory and optical spectroscopy performed at different institutions: second harmonic generation (U. Wisconsin), low-frequency Raman spectroscopy (ORNL), and photoluminescence and absorbance (ANL).
M. J. Shearer, L. Samad, Y. Zhang, Y. Zhao, A. Puretzky, K. W. Eliceiri, J. C. Wright, R. J. Hamers, and S. Jin, "Complex and Noncentrosymmetric Stacking of Layered Metal Dichalcogenide Materials Created by Screw Dislocations," J. Am. Chem. Soc. 139, 3496-3504, (2017). DOI: 10.1021/jacs.6b12559
