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Large Spatially Resolved Rectification In A Donor-Acceptor Molecular Heterojunction.

Joseph A. Smerdon, Noel C. Giebink, N. Guisinger, P. Darancet, J. Guest
Published 2016 · Physics, Medicine, Materials Science

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We demonstrate that rectification ratios (RR) of ≳250 (≳1000) at biases of 0.5 V (1.2 V) are achievable at the two-molecule limit for donor-acceptor bilayers of pentacene on C60 on Cu using scanning tunneling spectroscopy and microscopy. Using first-principles calculations, we show that the system behaves as a molecular Schottky diode with a tunneling transport mechanism from semiconducting pentacene to Cu-hybridized metallic C60. Low-bias RRs vary by two orders-of-magnitude at the edge of these molecular heterojunctions due to increased Stark shifts and confinement effects.
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