Fig. 2: AFM characterization of array wrinkles on substrates with different lattice symmetries.
From: Programmable nanowrinkle-induced room-temperature exciton localization in monolayer WSe2
a Wrinkles in a monolayer of WSe2 on a square array of nanocones. b Detail of yellow square in (a) exhibiting both strong and weak conformity of the WSe2 to the cone. c A polar histogram of wrinkle directions in (a), with the bins corresponding to lattice directions colored red. d WSe2 on a triangular array of nanocones, with the flat monolayer region outlined in pink, the multilayer in cyan, and a transition zone where the monolayer crumpled up during transfer in green. e Detail of yellow square in (d) showing kinking of some wrinkles as they spiral around cones. The measured SHG response from the monolayer is overlaid in pink and indicates that the crystallographic axes are closely aligned to the nanocone array. f A polar histogram of wrinkle directions in (d), with the bins corresponding to lattice directions colored red. Only wrinkles in the flat (pink) monolayer region were counted. All scale bars are 500 nm.
