Making good electrical connections to devices has always been important but may be even more important with organic semiconductors. The high simplified figure below shows a hypothetical single organic molecule (polyacetylene) based FET with metal contacts at each end. According the the article Molecular electronics with single molecules in solid-state devices by Kasper Moth-Poulsen & Thomas Bjørnholm, the molecular-electrode coupling strength strongly effects the electronic state of the entire device. The conduction of the electrons through the device can range from hopping to tunneling as the molecule-electrode contact goes from weak to strong.