Enhancing Photoluminescence and Mobilities in WS₂ Monolayers with Oleic Acid Ligands.

ABSTRACT: Many potential applications of monolayer transition metal dichalcogenides (TMDs) require both high photoluminescence (PL) yield and high electrical mobilities. However, the PL yield of as prepared TMD monolayers is low and believed to be limited by defect sites and uncontrolled doping. This has led to a large effort to develop chemical passivation methods to improve PL and mobilities. The most successful of these treatments is based on the nonoxidizing organic "superacid" bis(trifluoromethane)sulfonimide (TFSI) which has been shown to yield bright monolayers of molybdenum disulfide (MoS₂) and tungsten disulfide (WS₂) but with trap-limited PL dynamics and no significant improvements in field effect mobilities. Here, using steady-state and time-resolved PL microscopy we

SUBMITTER: Tanoh AOA 

PROVIDER: S-EPMC6746058 | biostudies-literature | 2019 Sep

REPOSITORIES: biostudies-literature