Interface formation between poly(9,9-dioctylfluorene) and Ca electrode investigated using photoelectron spectroscopy

Ultraviolet photoelectron spectroscopy and X-ray photoelectron spectroscopy (XPS) have been used to study the interface formation between poly(9,9-dioctylfluorene) (PFO) and Ca electrode. As the Ca coverage increases, the vacuum energy level of PFO decreases gradually in order to match the Fermi lev...

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Published inChemical physics letters Vol. 325; no. 4; pp. 405 - 410
Main Authors Liao, L.S., Cheng, L.F., Fung, M.K., Lee, C.S., Lee, S.T., Inbasekaran, M., Woo, E.P., Wu, W.W.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 28.07.2000
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Summary:Ultraviolet photoelectron spectroscopy and X-ray photoelectron spectroscopy (XPS) have been used to study the interface formation between poly(9,9-dioctylfluorene) (PFO) and Ca electrode. As the Ca coverage increases, the vacuum energy level of PFO decreases gradually in order to match the Fermi level ( E F) of Ca. The original highest occupied molecular orbital of PFO moves away from the E F, and vanishes eventually. Bipolaron states with 1.8 eV in peak interval are formed in the former energy gap. The original lowest occupied molecular orbitals of PFO are broadened resulting in a featureless shake-up in the XPS C1s core level.
ISSN:0009-2614
1873-4448
DOI:10.1016/S0009-2614(00)00722-3