A key requirement for well performing devices based on organic semiconductors is to ensure ohmic contacts, where an efficient hole and electron injection and extraction can be achieved at the electrode/semiconductor interfaces.The usual way to obtain ohmic contacts involves fine tuning of the energetics at the interfaces by using dopants (p-type and n-type) to control the Fermi level of the semiconductor [1,2], or using suitable metals or metal oxides as electrodes [3].These strategies are not often compatible with large area printing on flexible substrates.Similar difficulties are found with printing of molecular layers of dipoles to allow tunnelling to the electrode in organic solar cells.The insulating dipole layers [4] used to prevent recombination of electrons and holes at the contacts may compatible with nanocontacts formed by a metallic or semimetallic electronic conductor, covering a small fraction of the interface area.