Determining the Optimized Interlayer Separation Distance in Vertical Stacked 2D WS2:hBN:MoS2 Heterostructures for Exciton Energy Transfer. Issue 13 (7th February 2018)

• Record Type: Journal Article
• Authors: Xu, Wenshuo; Kozawa, Daichi; Liu, Yu; Sheng, Yuewen; Wei, Ke; Koman, Volodymyr B.; Wang, Shanshan; Wang, Xiaochen; Jiang, Tian; Strano, Michael S.; Warner, Jamie H.
• Is Part Of: Small. Volume 14:Issue 13(2018)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2018-02-07
• Subjects: 2D heterostructures -- energy transfer -- hexagonal boron nitride -- photoluminescence -- transition metal dichalcogenides; Nanotechnology -- Periodicals; Nanoparticles -- Periodicals; Microtechnology -- Periodicals; 620.5
• DOI: 10.1002/smll.201703727
• Languages: English
• ISSNs: 1613-6810

Abstract

Abstract: The 2D semiconductor monolayer transition metal dichalcogenides, WS2 and MoS2, are grown by chemical vapor deposition (CVD) and assembled by sequential transfer into vertical layered heterostructures (VLHs). Insulating hBN, also produced by CVD, is utilized to control the separation between WS2 and MoS2 by adjusting the layer number, leading to fine‐scale tuning of the interlayer interactions within the VLHs. The interlayer interactions are studied by photoluminescence (PL) spectroscopy and are demonstrated to be highly sensitive to the input excitation power. For thin hBN separators (one to two layers), the total PL emission switches from quenching to enhancement by increasing the laser power. Femtosecond broadband transient absorption measurements demonstrate that the increase in PL quantum yield results from Förster energy transfer from MoS2 to WS2 . The PL signal is further enhanced at cryogenic temperatures due to the suppressed nonradiative decay channels. It is shown that (4 ± 1) layers of hBN are optimum for obtaining PL enhancement in the VLHs. Increasing thickness beyond this causes the enhancement factor to diminish, with the WS2 and MoS2 then behaving as isolated noninteracting monolayers. These results indicate how controlling the exciton generation rate influences energy transfer and plays an important role in the properties of VLHs. Abstract : Separating MoS2 and WS2 vertical stacks with hBN one layer at a time enables the optimized distance to be evaluated for Förster energy transfer in the coupled system. Increased photoluminescence is observed in WS2 due to exciton transfer from higher energy MoS2 states with four hBN layers. This has important implications for next generation 2D optoelectronics.