Transport characteristics. (a) Transfer characteristics show steep subthreshold characteristics with drain-voltage dependent threshold voltage shift. (b) Output characteristics show a saturating behavior followed by a negative differential resistance. (c) With increasing drain bias, the transmission window shrinks due to a spectral misalignment (Addition file 1). (d) The increasing Fermi function difference between the two contacts and the decreasing transmission lead to an increasing and then decreasing T(E)[fs − fd] function.
Raza Nanoscale Research Letters 2013 8:74 doi:10.1186/1556-276X-8-74