Experimental Data Confirm Carrier-Cascade Model for Solid-State Conductance across Proteins

Eszter Papp, Gábor Vattay, Carlos Romero-Muñiz, Linda A. Zotti, Jerry A. Fereiro, Mordechai Sheves, David Cahen

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

The finding that electronic conductance across ultrathin protein films between metallic electrodes remains nearly constant from room temperature to just a few degrees Kelvin has posed a challenge. We show that a model based on a generalized Landauer formula explains the nearly constant conductance and predicts an Arrhenius-like dependence for low temperatures. A critical aspect of the model is that the relevant activation energy for conductance is either the difference between the HOMO and HOMO-1 or the LUMO+1 and LUMO energies instead of the HOMO-LUMO gap of the proteins. Analysis of experimental data confirms the Arrhenius-like law and allows us to extract the activation energies. We then calculate the energy differences with advanced DFT methods for proteins used in the experiments. Our main result is that the experimental and theoretical activation energies for these three different proteins and three differently prepared solid-state junctions match nearly perfectly, implying the mechanism’s validity.

Original languageEnglish
Pages (from-to)1728-1734
Number of pages7
JournalJournal of Physical Chemistry B
Volume127
Issue number8
DOIs
StatePublished - 2 Mar 2023
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2023 American Chemical Society.

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