Two dimensional band structure mapping of organic single crystals using the new generation electron energy analyzer ARTOF
2012 (English)In: Journal of Electron Spectroscopy and Related Phenomena, ISSN 0368-2048, E-ISSN 1873-2526, Vol. 185, no 3-4, 55-60 p.Article in journal (Refereed) Published
We report on a novel type of photoemission detector, the Angle Resolved Time Of Flight electron energy analyzer (ARTOF 10k), which enables electronic band structure determination under measurement conditions that are ideal for radiation-sensitive samples. This is facilitated through the combination of very high electron transmission and wide accessible angular range in one geometry. These properties make the ARTOF 10k predestined to investigate specimens that strongly suffer from radiation damage during photoemission experiments under "standard" conditions, such as organic single crystals, as extremely low fluxes can be used while not compromising spectra accumulation times and signal-to-noise ratio. Even though organic single crystals are of increasing fundamental and applied scientific interest, knowledge of their electronic properties is still largely based on theoretical calculations due to major experimental challenges in measuring photoemission. In this work we show that the band structures of rubrene and tetracene single crystals can be obtained with unprecedented quality using the ARTOF 10k detector. The dispersion of the highest occupied band in rubrene is confirmed in accordance with an earlier report  and we disclose the absence of notable dispersion for the highest occupied energy level on the surface of tetracene single crystals.
Place, publisher, year, edition, pages
2012. Vol. 185, no 3-4, 55-60 p.
Photoemission, Bandstructure, Tetracene, Rubrene, Organic single crystal
Condensed Matter Physics
Research subject Physics
IdentifiersURN: urn:nbn:se:uu:diva-176841DOI: 10.1016/j.elspec.2012.01.003ISI: 000304640700002OAI: oai:DiVA.org:uu-176841DiVA: diva2:537251