Dependence of Raman and absorption spectra of stacked bilayer MoS_2 on the stacking orientation

• DOI: 10.1364/oe.24.021551
• Publication Date: 2016-09-08T15:05:38Z
• Authors: Seki Park; Hyun Kim; Min Su Kim; Gang Hee Han; Jeongyong Kim
• Keywords: 02 engineering and technology; 0210 nano-technology

Stacked bilayer molybdenum disulfide (MoS2) exhibits interesting physical properties depending on the stacking orientation and interlayer coupling strength. Although optical properties, such as photoluminescence, Raman, absorption are largely dependent of stacked MoS2, origin variations in these is not clearly understood. We performed comprehensive confocal Raman mapping measurements to determine dependence spectra MoS2. The results indicated that with 532-nm laser excitation, scattering intensity gradually increased upon increasing angle from 0° 60°, whereas 458-nm excitation resulted opposite trend decreasing angle. This behavior was explained by varying resonance condition between wavelength C exciton energy Our work sheds light intriguing effect subtle interaction MoS2 bilayers resulting properties.