Abstract
The two-dimensional van der Waals (vdW) heterostructure composed of transition metal dichalcogenides (TMDs) has great photoelectric properties because of different energy band arrangements and interactions between layers. The lattice structure and photophysical properties of TMDs can be regulated through pressure, thus altering the properties of interlayer excitons. This study’s chemical vapor deposition method grew MoS2/WS2 vertical heterostructure. Its vibration mode signal and interactions between layers under pressure were investigated by pressure-variable Raman and photoluminescence (PL) spectra. We found that an inflection point appears at 1.22 GPa-1.89 GPa, and the PL peak changed with the variation trend of pressure. It is believed that the energy band transformation of MoS2/WS2 vertical heterostructures is induced by pressure. Our findings provide valuable information which is conducive to the development of new functional optoelectronic devices.
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