Abstract
How an electron crosses a metal−molecule interface has been a longstanding question in many disciplines. The prevalence of this question is illustrated by the different terms used to describe essentially the same process: interfacial electron transfer, charge injection, charge transport, and electron attachment to name a few. The recent surge of interest in molecule-based electronics has renewed the need for quantitative answers to this question. In molecule-based conventional electronic devices, such as organic light-emitting diodes, the metal−molecule interface determines the charge-injection efficiency. The importance of the interface only increases as device dimensions shrink to the scale of a single molecule or a small group of molecules (i.e., molecular electronics). This account takes an experimentalist's view and discusses recent progress in understanding electron transport at metal−molecule interfaces using two-photon photoemission (2PPE) spectroscopy. A 2PPE experiment probes interfacial electr...
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