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arXiv · 1603.06394

Large spatially-resolved rectification in a donor-acceptor molecular heterojunction

Joseph A. Smerdon·Noel C. Giebink·Nathan P. Guisinger·Pierre Darancet·Jeffrey R. Guest
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Abstract

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 fullerene 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 fullerene. 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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Joseph A. Smerdon, Noel C. Giebink, Nathan P. Guisinger, Pierre Darancet, Jeffrey R. Guest. 2016-03-21. Large spatially-resolved rectification in a donor-acceptor molecular heterojunction. https://doi.org/10.1021/acs.nanolett.6b00171

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