Temperature-dependent and bistable current-voltage measurements in zinc porphyrin molecular junctions

Swatilekha Saha, Adrien Nicolal, Jonathan R. Owens, Alexandra Krawicz, Peter H. Dinolfo, Vincent Meunier, Kim M. Lewis

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


We report bistability in current-voltage curves from di(PEP)PorZn in an electromigrated molecular junction. Bistability was observed at ±0.3 V at 300 K but did not occur at 4 K. No bistability was identified at 300 K for another porphyrin molecule (di(Xyl)PorZn), where the phenyl-ethnyl-phenyl (PEP) side groups were replaced with a flexible p-xylene. Molecular dynamics simulations show that bistability may be due to conformation changes related to the fluctuation of the dihedral angle surrounding the zinc and/or the rotation of the porphyrin central plane of the molecule. Results suggest that other mechanisms may play a role in the current-voltage characteristics observed.

Original languageEnglish (US)
Pages (from-to)10085-10090
Number of pages6
JournalACS Applied Materials and Interfaces
Issue number19
StatePublished - May 20 2015

All Science Journal Classification (ASJC) codes

  • General Materials Science


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