Electronic structures of the highest occupied molecular orbital bands of a pentacene ultrathin film.
We report the energy dispersions of the highest occupied molecular orbitals (HOMO)-derived bands of a pentacene (Pn) thin film, whose in-plane structure resembles closely that of the ab plane of a low-density bulk Pn phase. Our present photoemission result indicates that the overlap of the pi-orbitals of adjacent Pn molecules is larger than what was expected from theoretical calculations. Further, of the two HOMO-derived bands, the large dispersion width of the band with higher binding energy suggests that this one mainly contributes to the bandlike charge transport in a Pn crystal.
Graduate School of Advanced Integration Science, Chiba University, Chiba 263-8522, Japan.
Haruya
H
Kakuta
Toru
T
Hirahara
Iwao
I
Matsuda
Tadaaki
T
Nagao
Shuji
S
Hasegawa
Nobuo
N
Ueno
Kazuyuki
K
Sakamoto