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We have studied the switching characteristics of an optical molecular switch based on the phenoxynaphthacenequinone (PNQN) molecule with two armchair single-walled carbon nanotube (SWCNT) electrodes using the first-principles density functional-based non-equilibrium Green's function (DFT-NEGF) method. It is shown that a maximum on–off ratio (about 120) can be obtained at 0.9V. Our result shows that...
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