Large Spatially Resolved Rectification in a Donor–Acceptor Molecular Heterojunction

详细信息    查看全文

• 作者：Joseph A. Smerdon ; Noel C. Giebink ; Nathan P. Guisinger ; Pierre Darancet ; Jeffrey R. Guest
• 刊名：Nano Letters
• 出版年：2016
• 出版时间：April 13, 2016
• 年：2016
• 卷：16
• 期：4
• 页码：2603-2607
• 全文大小：439K
• 年卷期：0
• ISSN：1530-6992

文摘

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.