期刊
JOURNAL OF CHEMICAL PHYSICS
卷 135, 期 18, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3657435
关键词
graphene; molecular electronic states; nanostructured materials; optical materials
资金
- NUS [R-144-000-237-133, R-144-000-255-112]
The open and closed isomers of the diarylethene molecule that can be converted between each other upon photo-excitation are found to have drastically different current-voltage characteristics when sandwiched between two graphene nanoribbons (GNRs). More importantly, when one GNR is metallic and another one is semiconducting, strong rectification behavior of the closed diarylethene isomer with the rectification ratio > 10(3) is observed. The surprisingly high rectification ratio originates from the band gap of GNR and the bias-dependent variation of the lowest unoccupied molecular orbital of the diarylethene molecule, the combination of which completely shuts off the current at positive biases. Results presented in this paper may form the basis for a new class of molecular electronic devices. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3657435]
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