Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2011-11-08
The Journal of Chemical Physics 135, 184703 (2011)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
The Journal of Chemical Physics 135 (2011)
Scientific paper
10.1063/1.3657435
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 (LUMO) 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.
Cai Yongqing
Feng Yuan Ping
Zhang Aihua
Zhang Caicheng
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