Electronic transport through occupied and unoccupied states of an organic molecule on Au: Experiment and theory
Research output: Contribution to journal › Research article › Contributed › peer-review
Contributors
Abstract
Scanning tunneling spectroscopy (STS) measurements on highly ordered double layers of the planar organic molecule hexa-peri-hexabenzocoronene (C42H18) on Au(100) are presented and compared to a theoretical characterization of the electronic conductance based on a combination of the Landauer transport formalism with a density-functional-parametrized tight-binding scheme within the local density approximation (LDA). Tunneling spectroscopy data have been recorded within an extended voltage range of +/-2.5 V. In this room temperature STS experiment it was possible to derive not only the energetic positions of the frontier orbitals of a molecular species from tunneling spectroscopy but also the energies of the molecular states next to these frontier orbitals. To achieve a satisfactory agreement between experiment and theory a scaling parameter is necessary which compensates for the underestimation of the electronic energy gap in LDA.
Details
Original language | English |
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Article number | 245422 |
Number of pages | 8 |
Journal | Physical review. B |
Volume | 65 |
Issue number | 24 |
Publication status | Published - 15 Jun 2002 |
Peer-reviewed | Yes |
External IDs
ORCID | /0000-0001-8121-8041/work/142240830 |
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Keywords
Keywords
- SCANNING-TUNNELING-MICROSCOPY, ULTRAVIOLET PHOTOELECTRON-SPECTROSCOPY, HEXA-PERI-BENZOCORONENE, LAYERED SEMICONDUCTORS, STM INVESTIGATIONS, EPITAXIAL-GROWTH, FILMS, CONDUCTANCE, GRAPHITE, LEED