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Hubbard Nonequilibrium Green's Function Analysis Of Photocurrent In Nitroazobenzene Molecular Junction.

K. Miwa, Amin Morteza Najarian, R. McCreery, Michael Galperin
Published 2019 · Materials Science, Physics, Medicine

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We present a combined experimental and theoretical study of photoinduced current in molecular junctions consisting of monolayers of nitroazobenzene oligomers chemisorbed on carbon surfaces and illuminated by ultraviolet-visible light through a transparent electrode. Experimentally observed dependence of the photocurrent on light frequency, temperature, and monolayer thickness is analyzed within first-principles simulations employing the Hubbard nonequilibrium Green's function diagrammatic technique. We reproduce qualitatively correct behavior and discuss mechanisms leading to the characteristic behavior of dark and photoinduced currents in response to changes in bias, frequency of radiation, temperature, and thickness of molecular layer.
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