[2P01-37] Poster

[2P04] Band dispersion measurements of rubrene single crystals by ARUPS and comparison with theoretical calculations

*Masaki Murakami¹, Keisuke Fukutani², Daijiro Okaue³, Ken-ichi Fukui^2,3, Hiroyuki Ishii⁴, Satoshi Kera^1,2 (1. Graduate School of Science and Engineering, Chiba University., 2. Institute for Molecular Science., 3. Osaka University., 4. Tsukuba University.)

While technological advances have been made in organic devices, the details of charge transport mechanisms in organic semiconductors remain unexplored. In this study, in order to measure the band structure of rubrene single crystals with unprecedented accuracy, we used high quality single crystals and performed comprehensive measurements of band dispersion by angle-resolved ultraviolet photoemission spectroscopy (ARUPS). The band dispersion was observed not only in the Γ-Y direction, which had been identified in previous studies, but also in the Γ-X direction. It was also demonstrated that the Γ point does not determine the lowest gap energy in the Γ-X direction.