Abstract
Transition metal dichalcogenides (TMDs) have attracted much attention as a novel two-dimensional semiconductor, and also are promising candidate for the future optoelectric devices [1,2]. Van der Waals hetero-structures composed of TMDs can be suitable platform to realize functional semiconductor devices. For instance, recent reported ultrafast interlayer charge transfer in monolayer MoS2-WS2 hetero-structure [3] provided the possibility to realize the efficient light harvesting devices. Formation of long-lived interlayer excitons in MoSe2-WSe2 hetero-structure [4] could give to develop exciton engineering including quantum condensation. Despite these intriguing features, optical properties in Van der Waals hetero-structures have been unclear. Further study focusing on charge transfer and interlayer exciton dynamics has been required. We studied photoluminescence (PL) properties of van der Waals hetero-structures building from monolayer (1L-) MoS2 and MoSe2 and discuss the exciton dynamics in this material.
© 2015 Japan Society of Applied Physics, Optical Society of America
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