Heterointerface Screening Effects between Organic Monolayers and Monolayer Transition Metal Dichalcogenides

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• 作者：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
• 刊名：ACS Nano
• 出版年：2016
• 出版时间：February 23, 2016
• 年：2016
• 卷：10
• 期：2
• 页码：2476-2484
• 全文大小：498K
• ISSN：1936-086X

文摘

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.