Determination of the highest occupied molecular orbital energy of pentacene single crystals by ultraviolet photoelectron and photoelectron yield spectroscopies

Determination of the highest occupied molecular orbital energy of pentacene single crystals by ultraviolet photoelectron and photoelectron yield spectroscopies

The electronic structures of pentacene single crystals (SCs) were elucidated by ultraviolet photoelectron spectroscopy (UPS) and photoelectron yield spectroscopy (PYS). An asymmetric HOMO peak profile of the pentacene SCs obtained by UPS exhibits a close similarity to the k-projected density-of-stat...

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Veröffentlicht in:Japanese Journal of Applied Physics 2014-01, Vol.53 (1S), p.1-1-01AD03-4
Hauptverfasser: Nakayama, Yasuo, Uragami, Yuki, Yamamoto, Masayuki, Machida, Shin'ichi, Kinjo, Hiroumi, Mase, Kazuhiko, Koswattage, Kaveenga Rasika, Ishii, Hisao
Format: Artikel
Sprache:eng
Schlagworte:
Asymmetry
Mathematical analysis
Molecular orbitals
Pentacene
Photoelectrons
Similarity
Single crystals
Spectroscopy
UPS
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Zusammenfassung:The electronic structures of pentacene single crystals (SCs) were elucidated by ultraviolet photoelectron spectroscopy (UPS) and photoelectron yield spectroscopy (PYS). An asymmetric HOMO peak profile of the pentacene SCs obtained by UPS exhibits a close similarity to the k-projected density-of-states of the valence band that has been predicted by a theoretical calculation [H. Yoshida and N. Sato, Phys. Rev. B 77, 235205 (2008)]. The ionization energy of the pentacene SCs is successfully determined to be 4.95 (± 0.03) eV which is evidently greater than that of the bulk films of pentacene [4.90 (± 0.02) eV].
ISSN:0021-4922
1347-4065
DOI:10.7567/JJAP.53.01AD03