Optical characterization of the structural imperfection of two-dimensional MoS$_{2}$ crystallites

Two-dimensional molybdenum disulfide crystallites grown by mechanical exfoliation and chemical vapor deposition have been studied. It is shown that both methods can be used to obtain individual crystallites with a monoatomic thickness and similar optical properties. It is found that crystallites grown by chemical vapor deposition have a higher defect concentration than those grown by mechanical exfoliation.