Influence of interface dielectric disorder on interlayer excitons in mixed binary/ternary TMD heterostructures
Mohammed Adel Aly1,2, Emmanuel Oghenevo Enakerakpor1, Hilary Masenda1,3
1Faculty of Physics and Materials Sciences Center, Philipps-Universität Marburg 35032 Marburg Germany martin.koch@physik.uni-marburg.de mohammed.nouh@physik.uni-marburg.de.
None:
In this paper, we study the excitonic linewidths and peak energies in two transition metal dichalcogenide heterostructures of Mo0.5W0.5Se2 and its binary counterparts, MoSe2 and WSe2. We observe spectra composed of several individual excitonic transitions in temperature-dependent photoluminescence measurements. Among these are transitions of neutral excitons and trions from the binary layers and the interlayer excitons from the heterostructures. The luminescence linewidth of the interlayer excitons is significantly broader than the linewidths of the excitonic transitions from the binary layers. We attribute this additional line broadening to dielectric disorder caused by spatial inhomogeneity at the interface.
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