Key Laboratory of Analytical Chemistry for Life Science (Ministry of Education), School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210008, PR China.
Phys Chem Chem Phys. 2011 Jan 28;13(4):1301-6. doi: 10.1039/c0cp00118j. Epub 2010 Dec 9.
We have conducted a theoretical study on the electronic transport behaviour of two molecular diodes connected in series. The single diode is composed of o-nitrotoluene and o-aminotoluene connecting via a σ-bridge, and the tandem diode is two single diodes connecting via a π-bridge. It was found that the rectification ratio was greatly improved due to the electronic coupling in the tandem diode. The rectification ratio of the tandem molecular diode can be 20 times higher than that of the single diode, which is quite different from a traditional diode. In addition, we also found that the high rectification ratio correlates with the intramolecular coupling of the tandem system. When long conjugated wires are employed in two single diodes, the rectification ratio is reduced.
我们对通过σ键连接的两个分子二极管串联的电子输运行为进行了理论研究。单二极管由邻硝基甲苯和邻氨基甲苯通过σ键连接而成，而串联二极管则是两个单二极管通过π键连接而成。研究发现，由于串联二极管中的电子耦合，整流比得到了很大的提高。串联分子二极管的整流比可以比单二极管高 20 倍，这与传统二极管有很大的不同。此外，我们还发现，高整流比与串联系统的分子内耦合有关。当两个单二极管中使用长共轭导线时，整流比会降低。
