Electrical Rectification in a Langmuir−Blodgett Monolayer of Dimethyanilinoazafullerene Sandwiched between Gold Electrodes

Asymmetries were observed across a monolayer of dimethylanilinoaza fullerene, sandwiched between gold electrodes of relatively large size

Robert M. Metzger

2003

Scholarcy highlights

  • Asymmetries were observed across a monolayer of dimethylanilinoazafullerene, sandwiched between gold electrodes of relatively large size
  • At more negative potentials the current is very small. This high asymmetry in current persists for between 10 and 20 cycles of voltage scan. This increased, but ohmic conductivity is probably due to defects that grow at domain boundaries, since this behavior is not seen when very small electrodes are used
  • The defects could be stalagmitic filaments of gold which grow from the bottom electrode above V1 but are broken at the negative bias V2, or else they could be due to some unknown electrochemical couple
  • This device is vaguely reminiscent of Zener diodes or varistors: if operated between, say, + 2 V and −2 V, it is a super-rectifier, with a rectification ratio of up to 20 000 at 1.5 V
  • Laboratory for Molecular Electronics of the Department of Chemistry, The University of Alabama

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