Frisenda Riccardo, Parlato Loredana, Barra Mario, van der Zant Herre S J, Cassinese Antonio
Kavli Institute of Nanonscience, Delft University of Technology, Lorentzweg 1, 2628 CJ, Delft, The Netherlands,
Nanoscale Res Lett. 2015 Dec;10(1):1011. doi: 10.1186/s11671-015-1011-3. Epub 2015 Jul 28.
In this letter, we report the single-molecule conductance properties of a cyano-functionalized perylene-diimide derivative (PDI8-CN2) investigated with gold nano-electrodes. This molecule is of large interest for the fabrication of high-performance and air-stable n-type organic field-effect transistors. Low-bias experiments performed on mechanically controllable break junctions reveal the presence of two different values of the single-molecule conductance, which differ by about two orders of magnitudes. Up to date, this feature was never observed for other perylene-diimide compounds having alternative chemical moieties attached to the basic aromatic core. Theoretical calculations suggest that the highest single-molecule conductance value here observed, comprised between 10(-2) and 10(-3) G0, is related to a charge transport path directly linking the two cyano groups.
在这封信中，我们报告了用金纳米电极研究的氰基官能化苝二酰亚胺衍生物（PDI8-CN2）的单分子电导特性。该分子对于制造高性能且空气稳定的n型有机场效应晶体管具有重大意义。在机械可控断裂结上进行的低偏压实验揭示了单分子电导存在两个不同的值，它们相差约两个数量级。迄今为止，在连接到基本芳香核上具有其他化学基团的其他苝二酰亚胺化合物中从未观察到这一特征。理论计算表明，此处观察到的最高单分子电导值介于10^(-2) 和10^(-3) G0之间，与直接连接两个氰基的电荷传输路径有关。
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