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27 February 2002 Interfaces between poly(9,9-dioctylfluorene) and alkali metals as affected by molecular weight and oxygen
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Abstract
The electronic structure of poly(9,9-dioctylfluorene)(PFO) in different molecular weights coated with alkali metals (K and Cs) has been studied by x-ray photoelectron spectroscopy (XPS) and ultraviolet photoelectron spectroscopy (UPS). No significant differences on the electronic structures were observed for all combinations of alkali metals and PFO in different molecular weights. These metals led to low injection barrier at the K/PFO or Cs/PFO interfaces and induced bipolaron gap states in the PFO. With increasing coverage of the alkali metals, the bipolaron states and the highest-occupied molecular orbitals gradually broadened, and the two shake-up peaks of Cls XPS peaks associated with the lowest-unoccupied molecular orbitals of PFO also broadened and greatly diminished. Upon slight oxygen exposure, the two bipolaron states disappeared and the deformed features in the UPS and XPS spectra were partially recovered.
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Man Keung Fung, S. L. Lai, S. N. Bao, C. S. Lee, James J. O'Brien, Michael Inbasekaran, Weishi W. Wu, and Shuit-Tong Lee "Interfaces between poly(9,9-dioctylfluorene) and alkali metals as affected by molecular weight and oxygen", Proc. SPIE 4464, Organic Light-Emitting Materials and Devices V, (27 February 2002); https://doi.org/10.1117/12.457480
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