Hybrid heterojunctions between a 2D transition metal dichalcogenide and metal phthalocyanines: their energy levels vis-à-vis current rectification

Literature Information

Publication Date 2017-10-06
DOI 10.1039/C7CP05470J
Impact Factor 3.676
Authors

Arnab Banerjee, Biswajit Kundu, Amlan J. Pal


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Abstract

We form junctions between a monolayer of a range of metal-phthalocyanines and a monolayer of 2D transition metal dichalcogenides (TMD) through an electrostatic adsorption process. The energy levels of the components, as drawn from scanning tunneling spectroscopy (STS) and the density of states (DOS) thereof, indicated that the hybrid junctions would act as current rectifiers. We have observed that the central metal atom affected the energies of the metalorganics and thereby the rectification ratio of the junctions. In addition, since planar single molecule magnets (SMMs) were used in which magnetization appears due to the 3d-electrons of the metal, we could align the molecules followed by their structural immobilization. We have observed that such an alignment changed their molecular orbitals and hence affected the energy levels at the interface. The rectification ratio of molecule|TMD hybrid junctions depends on the metal in metalorganics and also on their alignment with the substrate electrode. In effect, the rectification ratio in a range of junctions has been correlated to the energy-level diagram at the interface.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
Self-citation Rate: 10.3%
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Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

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