Quantifying transition voltage spectroscopy of molecular junctions: Ab initio calculations

Jingzhe Chen, Troels Markussen, Kristian Sommer Thygesen

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Transition voltage spectroscopy (TVS) has recently been introduced as a spectroscopic tool for molecular junctions where it offers the possibility to probe molecular level energies at relatively low bias voltages. In this work we perform extensive ab initio calculations of the nonlinear current-voltage relations for a broad class of single-molecule transport junctions in order to assess the applicability and limitations of TVS. We find, that in order to fully utilize TVS as a quantitative spectroscopic tool, it is important to consider asymmetries in the coupling of the molecule to the two electrodes. When this is taken properly into account, the relation between the transition voltage and the energy of the molecular orbital closest to the Fermi level closely follows the trend expected from a simple, analytical model.
Original languageEnglish
JournalPhysical Review B Condensed Matter
Volume82
Issue number12
Pages (from-to)121412
ISSN0163-1829
DOIs
Publication statusPublished - 2010

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