Jeremiah Horrocks Institute of Mathematics, Physics and Astronomy, University of Central Lancashire , Preston, PR1 2HE, United Kingdom.
Department of Electrical Engineering, The Pennsylvania State University , University Park, Pennsylvania 16802, United States.
Nano Lett. 2016 Apr 13;16(4):2603-7. doi: 10.1021/acs.nanolett.6b00171. Epub 2016 Mar 17.
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.
我们证明，在使用扫描隧道光谱和显微镜的情况下，对于 pentacene 与 C60 在 Cu 上的供体-受体双层结构，在 0.5 V（1.2 V）偏置下，在两个分子极限处可以实现 ≳250（≳1000）的整流比（RR）。使用第一性原理计算，我们表明该系统表现为分子肖特基二极管，具有从半导体 pentacene 到 Cu 杂化金属 C60 的隧道传输机制。由于 Stark 位移和限制效应的增加，在这些分子异质结的边缘，低偏置 RR 变化了两个数量级。
