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The extraordinary mechanical properties of 2D TMDCs make them idealcandidates for investigating strain-induced control of various physicalproperties. Here we explore the role of non-uniform strain in modulatingoptical, electronic and transport properties of semiconducting, chemical vapourdeposited monolayer MoS2, on periodically nanostructured substrates. Acombination of spatially resolved spectroscopic and electronic propertiesexplore and quantify the differential strain distribution and carrier densityon a monolayer, as it conformally drapes over the periodic nanostructures. Theobserved accumulation in electron density at the strained regions is supportedby theoretical calculations which form the likely basis for the ensuing 60xincrease in field effect mobility in strained samples. Though spatiallynon-uniform, the pattern induced strain is shown to be readily controlled bychanging the periodicity of the nanostructures thus providing a robust yetuseful macroscopic control on strain and mobility in these systems.

Mobility enhancement in CVD-grown monolayer MoS2 via patterned substrate induced non-uniform straining