Negative electron affinity of adamantane on Cu(111)

Jieru Li; Daniel Niesner; Thomas Fauster

doi:10.1088/1361-648X/abd99a

Negative electron affinity of adamantane on Cu(111)

J Phys Condens Matter. 2021 Jan 25;33(13). doi: 10.1088/1361-648X/abd99a.

Authors

Jieru Li¹, Daniel Niesner¹, Thomas Fauster¹

Affiliation

¹ Lehrstuhl für Festkörperphysik, Friedrich-Alexander-Universität Erlangen-Nürnberg, Staudtstraße 7, 91058 Erlangen, Germany.

PMID: 33412528
DOI: 10.1088/1361-648X/abd99a

Abstract

Photoelectron spectroscopy is used to show that thick adamantane films on Cu(111) have a negative electron affinity of -0.3 ± 0.1 eV. The ionization potential is obtained as 8.55 ± 0.15 eV resulting in a band gap of 8.9 ± 0.1 eV. For films of about 1.4 monolayer thickness the electron affinity is close to zero and the valence bands are shifted toward the Fermi energy due to charge transfer from Cu 3d bands.

Keywords: adamantane; electron affinity; photoemission spectroscopy.