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

doi:10.1021/acsami.5b02449

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

Engineering Science and Mechanics

Research output: Contribution to journal › Article › peer-review

4 Scopus citations

Abstract

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 language	English (US)
Pages (from-to)	10085-10090
Number of pages	6
Journal	ACS Applied Materials and Interfaces
Volume	7
Issue number	19
DOIs	https://doi.org/10.1021/acsami.5b02449
State	Published - May 20 2015

All Science Journal Classification (ASJC) codes

General Materials Science

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abstract = "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.",

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T1 - Temperature-dependent and bistable current-voltage measurements in zinc porphyrin molecular junctions

AU - Saha, Swatilekha

AU - Nicolal, Adrien

AU - Owens, Jonathan R.

AU - Krawicz, Alexandra

AU - Dinolfo, Peter H.

AU - Meunier, Vincent

AU - Lewis, Kim M.

PY - 2015/5/20

Y1 - 2015/5/20

N2 - 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.

AB - 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.

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

Abstract

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