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Local strain engineering is an exciting approach to tune the optoelectronicproperties of materials. Two dimensional (2D) materials such as 2D transitionmetal dichalcogenides (TMDs) are particularly well suited for this purposebecause they have high flexibility and they can withstand high deformationsbefore rupture. Local strain engineering in 2D TMDs is achieved via strainedwrinkles. Wrinkles on thick layers of TMDs are reported to show interestingphotoluminescence enhancement due to bandgap modulation and funneling effect.However, the wrinkles in ultrathin TMDs have not been investigated because theycan easily fall down to form folds in these ultrathin layers of TMDCs. Here, wehave achieved both wrinkles and folds simultaneously in 1-3L WS2 using a newfabrication technique. A layer dependent reduction in surface potential isfound for both folded layers and perfect pack layers due to the dominantinterlayer screening effect. Strain dependent modulation in semi conductivejunction properties is observed for strain induced wrinkles through currentscanning. Thermo-ionic modelling suggests that the strained (1.6%) wrinkles canlower the Schottky barrier height (SBH) by 20%. Upon illumination, SBH reducessignificantly due to photo-generated carriers. Our results present an importantadvance towards controlling the optoelectronic properties of atomically thinWS2 via strain engineering, with applications in optoelectronics, quantumoptics and nanophotonics device fabrication.

Tunable Optoelectronic Properties of WS$_2$ by Local Strain Engineering and Folding