Abstract
We report a strain-induced direct-to-indirect band gap transition in mechanically deformed WS2 monolayers (MLs). The necessary amount of strain is attained by proton irradiation of bulk WS2 and the ensuing formation of one-ML-thick, H2-filled domes. The electronic properties of the curved MLs are mapped by spatially- and time-resolved micro-photoluminescence revealing the mechanical stress conditions that trigger the variation of the band gap character. This general phenomenon, also observed in MoS2 and WSe2, further increases our understanding of the electronic structure of transition metal dichalcogenide MLs and holds a great relevance for their optoelectronic applications.
Highlights
We report a strain-induced direct-to-indirect band gap transition in mechanically deformed WS2 monolayers (MLs)
This is especially true in the case of two-dimensional (2D) crystals [such as graphene, hexagonal-BN, and transition metal dichalcogenide (TMD) monolayers (MLs)] due to their all-surface nature [1]
Nonuniform strains turn out to be extremely relevant: On the one hand, strain gradients in 2D TMDs can lead to a coherent drift of photogenerated carriers, relevant for photon harvesting [5,6]
Summary
Evidence of the direct-to-indirect band gap transition in strained two-dimensional WS2, MoS2, and WSe2 We report a strain-induced direct-to-indirect band gap transition in mechanically deformed WS2 monolayers (MLs).
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