Full metadata record
|dc.contributor.author||Jang, Yun Hee||ko|
|dc.identifier.citation||The 5th International Conference on Molecular Simulation (ICMS 2019)||-|
|dc.description.abstract||A Langmuir-Blodgett (LB) monolayer of a shuttlecock-shaped asymmetric fullerene derivative on Au(111) exhibits a rectification (i.e., asymmetric I-V curve or ON/OFF switching) under a conducting AFM measurement. Its rectification ratio at high voltage (1.5 V) is an order-of-magnitude higher than at low voltage (1.0 V). Using a multiscale molecular modeling combining molecular dynamics (MD), density functional theory (DFT), and non-equilibrium Green’s-function formalism (NEGF), we identify the origin of such rectification behavior of this plausible molecular diode, which can be a low-energy-consumption alternative of conventional Si-based diodes. The low rectification ratio exhibited at 1.0 V is reproduced by DFT-NEGF calculations on a metal-molecule-metal sandwich-type model device at a standing-up molecular orientation expected for a fresh LB monolayer. It originates from the slight asymmetry in molecular structure, which creates a non-negligible dipole moment. It is, however, insufficient to explain higher rectification ratios observed in experiments performed at 1.5 V. MD simulations of its self-assembled monolayer on Au(111) show that its molecular orientation can switch between standing-up and lying-on-the-side configurations in order to align its molecular dipole moment with the direction of the applied electric field. Indeed, DFT-NEGF calculations considering such field-induced reorientation yield an order-of-magnitude higher rectification ratio, explaining the experimental observation.||-|
|dc.title||Curiosity-Driven Molecular Modeling: Shuttlecock-Shaped Molecular Rectifier’s Asymmetric Electron Transport Coupled with Controlled Molecular Motion||-|
|dc.contributor.localauthor||Jang, Yun Hee||-|
|dc.identifier.citationTitle||The 5th International Conference on Molecular Simulation (ICMS 2019)||-|
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.