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Single-Electron Counting Spectroscopy: Simulation Study of Porphyrin in a Molecular Junction

Author(s):

Sven Welack, Jeremy B. Maddox, Massimiliano Esposito, Upendra Harbola, Shaul Mukamel

Journal:

Nano Letters

Year:

2008

Volume:

8

Pages

1137-1141

DOI:

10.1021/nl073292b

Abstract:

Electron counting of a single porphyrin molecule between two electrodes shows a crossover from sub- to super-Poissonian statistics as the bias voltage is scanned. This is attributed to the simultaneous activation of states with electron transfer rates spanning several orders of magnitude. Time-series analysis of consecutive single-electron transfer events reveals fast and slow transport channels, which are not resolved by the average current alone.

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