Heterointerface Screening Effects between Organic Monolayers and Monolayer Transition Metal Dichalcogenides

Yu Jie Zheng, Yu Li Huang, Yifeng Chen, Weijie Zhao, Goki Eda, Catalin D. Spataru, Wenjing Zhang, Yung-Huang Chang, Lain-Jong Li, Dongzhi Chi, Su Ying Quek, Andrew Thye Shen Wee

Research output: Contribution to journalArticlepeer-review

60 Scopus citations

Abstract

© 2016 American Chemical Society. The nature and extent of electronic screening at heterointerfaces and their consequences on energy level alignment are of profound importance in numerous applications, such as solar cells, electronics etc. The increasing availability of two-dimensional (2D) transition metal dichalcogenides (TMDs) brings additional opportunities for them to be used as interlayers in "van der Waals (vdW) heterostructures" and organic/inorganic flexible devices. These innovations raise the question of the extent to which the 2D TMDs participate actively in dielectric screening at the interface. Here we study perylene-3,4,9,10-tetracarboxylic dianhydride (PTCDA) monolayers adsorbed on single-layer tungsten diselenide (WSe2), bare graphite, and Au(111) surfaces, revealing a strong dependence of the PTCDA HOMO-LUMO gap on the electronic screening effects from the substrate. The monolayer WSe2 interlayer provides substantial, but not complete, screening at the organic/inorganic interface. Our results lay a foundation for the exploitation of the complex interfacial properties of hybrid systems based on TMD materials.
Original languageEnglish (US)
Pages (from-to)2476-2484
Number of pages9
JournalACS Nano
Volume10
Issue number2
DOIs
StatePublished - Jan 26 2016

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