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Interlayer excitons in CVD-grown WS2/MoS2 vertical heterostructures

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Abstract

Heterostructures of transition metal dichalcogenides (TMDCs) have attracted attention because of their emergent optical and electronic properties. As a representative example, the presence of interlayer excitons has been reported for TMDC-based vertical heterostructures [1,2]. However, in previous studies, an observed photoluminescence (PL) peak relating to the interlayer excitons has relatively-large linewidth probably due to the presence of inhomogeneous broadening. To solve this issues, we have developed the CVD process of TMDCs with highly-uniform optical spectra and their heterostructures [3,4]. Here, we report on the observation of sharp PL peaks in high-quality WS2/MoS2 vertical heterostructures.

© 2017 Japan Society of Applied Physics, Optical Society of America

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