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We review charge transport across molecular monolayers, which is central tomolecular electronics (MoE) using large-area junctions (NmJ). We strive toprovide a wide conceptual overview of three main sub-topics. First, a broadintroduction places NmJ in perspective to related fields of research, and tosingle molecule junctions (1mJ), in addition to a brief historical account. Ascharge transport presents an ultra sensitive probe for the electronicperfection of interfaces, in the second part ways to form both the monolayerand the contacts are described to construct reliable, defect-free interfaces.The last part is dedicated to understanding and analyses of current-voltage(I-V) traces across molecular junctions. Notwithstanding the originalmotivation of MoE, I-V traces are often not very sensitive to molecular detailsand then provide a poor probe for chemical information. Instead we focus on howto analyse the net electrical performance of molecular junctions, from afunctional device perspective. Finally, we shortly point to creation of abuilt-in electric field as a key to achieve functionality, including non-linearcurrent-voltage characteristics that originate in the molecules or theircontacts to the electrodes.

Large-area, ensemble molecular electronics: Motivation and challenges