Comparison of Electronic Transport Measurements on Organic Molecules


  • DC thanks the Israel Science Foundation, the Minerva Foundation (Munich), and the Delores and Eugene M. Zemsky John Hopkins-Weizmann Program for partial support. VBE and CDF thank the US National Science Foundation. AS and DC thank A. Kahn for illuminating discussions and a critical reading of the manuscript. We thank M. Ratner for useful comments.


We compile, compare, and discuss experimental results on low-bias, room-temperature currents through organic molecules obtained in different electrode–molecule–electrode test-beds. Currents are normalized to single-molecule values for comparison and are quoted at 0.2 and 0.5 V junction bias. Emphasis is on currents through saturated alkane chains where many comparable measurements have been reported, but comparison to conjugated molecules is also made. We discuss factors that affect the magnitude of the measured current, such as tunneling attenuation factor, molecular energy gap and conformation, molecule/electrode contacts, and electrode material.