Molecular Alignment and Electronic Structure of N,N'-Dibutyl-3,4,9,10-perylene-tetracarboxylic-diimide Molecules on MoS2 Surfaces.
Arramel ArramelXinmao YinQixing WangYu J ZhengZhibo SongMohammad H Bin HassanDianyu QiJishan WuAndrivo RusydiAndrew T S WeePublished in: ACS applied materials & interfaces (2017)
The molecular orientation of organic semiconductors on a solid surface could be an indispensable factor to determine the electrical performance of organic-based devices. Despite its fundamental prominence, a clear description of the emergent two-dimensional layered material-organic interface is not fully understood yet. In this study, we reveal the molecular alignment and electronic structure of thermally deposited N,N'-dibutyl-3,4,9,10-perylene-dicarboximide (PTCDI-C4) molecules on natural molybdenum disulfide (MoS2) using near-edge X-ray absorption fine structure spectroscopy (NEXAFS). The average tilt angle determination reveals that the anisotropy in the π* symmetry transition of the carbon K-edge (284-288 eV range) is present at the sub-monolayer regime. Supported by ultraviolet photoelectron spectroscopy (UPS), X-ray photoelectron spectroscopy (XPS), and resonant photoemission spectroscopy (RPES) measurements, we find that our spectroscopic measurements indicate a weak charge transfer established at the PTCDI-C4/MoS2 interface. Sterical hindrance due to the C4 alkyl chain caused tilting of the molecular plane at the initial thin film deposition. Our result shows a tunable interfacial alignment of organic molecules on transition metal dichalcogenide surfaces effectively enhancing the electronic properties of hybrid organic-inorganic heterostructure devices.
Keyphrases
- high resolution
- single molecule
- transition metal
- water soluble
- quantum dots
- reduced graphene oxide
- room temperature
- solid state
- ionic liquid
- mass spectrometry
- air pollution
- molecular docking
- biofilm formation
- dual energy
- genome wide
- computed tomography
- magnetic resonance imaging
- cystic fibrosis
- magnetic resonance
- electron microscopy
- molecularly imprinted