Tuning negative differential resistance in a molecular film

Grobis, M.; Wachowiak, A.; Yamachika, R.; Crommie, M. F.
May 2005
Applied Physics Letters;5/16/2005, Vol. 86 Issue 20, p204102
Academic Journal
We have observed variable negative differential resistance (NDR) in scanning tunneling spectroscopy measurements of a double layer of C60 molecules on a metallic surface. Minimum to maximum current ratios in the NDR region are tuned by changing the tunneling barrier width. The multilayer geometry is critical, as NDR is not observed when tunneling into a C60 monolayer. Using a simple model, we show that the observed NDR behavior is explained by voltage-dependent changes in the tunneling barrier height.


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