Contact resistance between Au and solution-processed CNT

We have studied the contact resistance ( R C ) between Au and a solution-processed film of carbon nanotubes (CNTs). The test element group of the contact chain is modeled as a simple periodic series of resistors, the R C represents the resistor of the Au–CNT contact. The contact resistivity ( ρ C ) was evaluated from R C by multiplying the contact area. When the sheet resistance ( R sh ) of the CNT layer is 200 Ω/sq, the ρ C is 27 μΩ cm 2, which is ∼30 times of that of the Au–IZO contact at the same R sh . This is mainly due to the three-dimensional shape of the CNT surface, resulting in a smaller contact area on the flat surface of the Au.