The electronic structure of pentacene revisited |
| |
| Authors: | S. Berkebile G. Koller A.J. Fleming P. Puschnig C. Ambrosch-Draxl K. Emtsev T. Seyller J. Riley M.G. Ramsey |
| |
| Affiliation: | aInstitute of Physics, Karl-Franzens University Graz, Universitätsplatz 5, 8010 Graz, Austria;bChair of Atomistic Modelling and Design of Materials, University of Leoben, Franz-Josef-Straße 18, 8700 Leoben, Austria;cLehrstuhl für Technische Physik, Universität Erlangen-Nürnberg, Erwin-Rommel-Str. 1, 91058 Erlangen, Germany;dDepartment of Physics, La Trobe University, VIC 3086, Australia |
| |
| Abstract: | Recently, there have been reports of the valence band photoemission of pentacene films grown on various substrates with particular emphasis on the highest occupied molecular orbital (HOMO) and its dispersion. In various works, evidence for HOMO band dispersion as high as 0.5 eV, even for polycrystalline films, has been presented. In apparent contradiction to these results, we have previously reported a band dispersion of only 50 meV, measured on a well characterised film with a single polymorph and single crystalline orientation, 5A(0 2 2). Here, we first present the two-dimensional momentum distribution of the HOMO of a 5A(0 2 2) film. Then the development of the valence band spectra for films grown at room temperature and low temperature are compared, and we show that morphological aspects can lead to the apparent observation of high HOMO dispersion. Finally, with the aid of the two-dimensional momentum distribution of the HOMO, we show that a reasonably large dispersion (0.25 eV) does indeed exist in 5A(0 2 2). |
| |
| Keywords: | Pentacene Photoemission Band dispersion Electronic structure |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
