Fig. 2: Metallic charge transport in Ph-BTBT-C10 bilayers.
From: Metallic charge transport in conjugated molecular bilayers
a, Device structure with a four-point-probe architecture (top) and the corresponding optical image (bottom). S, D, V1, V2 and V4p represent the source electrode, drain electrode, the voltages at the inner two probes and corresponding potential drop, respectively. The dielectric is 50-nm-thick SiO2. b, Temperature-dependent linear transfer characteristics at a drain voltage VD of −1 V. c, Temperature-dependent four-point-probe electrical conductivity σ4p at various carrier concentrations nc, all of which exhibit metallic behaviour. d, Conceptual colour bar of the electrical conductivities for various materials, including undoped organic semiconductors, inorganic semiconductors and metals. All the organic semiconductors are single crystalline, except TIPS-pentacene, which is polycrystalline.
