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Anisotropic optical constants of electroluminescent conjugated polymer thin films determined by variable-angle spectroscopic ellipsometry
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10.1063/1.2778744
/content/aip/journal/jap/102/6/10.1063/1.2778744
http://aip.metastore.ingenta.com/content/aip/journal/jap/102/6/10.1063/1.2778744

Figures

Image of FIG. 1.
FIG. 1.

Best fits of (a) anisotropic and (b) isotropic models (solid line) to experimental data (dashed line) for (Ref. 18). Fitting is shown for angles of incidence between and for reflection (◆, ∎, ●) and transmission (◇, ◻, 엯) data for F8BT/160K. A schematic diagram of the anisotropic optical model constructed using the WVASE32 software (inset a) and the chemical structure of F8BT (inset b) are also shown. (c) Comparison between the modeled values of and , in-plane and out-of-plane, fitted using an anisotropic model, and a model which is constructed to be, by definition, Kramers–Krönig consistent for a pristine film of F8BT/62K. Inset shows in-plane and out-of-plane directions defined with respect to the substrate.

Image of FIG. 2.
FIG. 2.

(a) In-plane values for pristine films of F8BT/9K (dashed line) and F8BT/255K (solid line) as a function of wavelength. (b) Peak values of (◆) and (◇) at the lowest energy absorption band for pristine films of F8BT with molecular weights . (c) Anisotropy in measured at the lowest energy absorption band for pristine films of F8BT. (d) In-plane values of for pristine films of F8BT/9K (dashed line) and F8BT/255K (solid line) as a function of wavelength. (e) Peak values of (◆) and (◇) at the lowest energy band for pristine films of F8BT. (f) Anisotropy in measured at the lowest energy band for pristine films of F8BT. Dotted lines are shown to indicate a trend. Values were measured over at least four samples for each data point and error bars calculated from the spread of values.

Image of FIG. 3.
FIG. 3.

(a) Comparison between (in-plane) of pristine films (◆) and those annealed to (●) and to (◻) for F8BT/9K. (b) Comparison between (in-plane) of pristine films (◆) and those annealed to (●) and to (◻) for F8BT/255K. Insets show values of absorption coefficient calculated from the optical density measured by UV–visible absorption spectroscopy. (c) Peak values of and for pristine films (◆) and those annealed to (●) and to (◻) measured at the lowest energy absorption band. Dotted lines are shown to indicate a trend.

Tables

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Table I.

Molecular weights of F8BT and annealing temperatures used.

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/content/aip/journal/jap/102/6/10.1063/1.2778744
2007-09-18
2014-04-19
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Anisotropic optical constants of electroluminescent conjugated polymer thin films determined by variable-angle spectroscopic ellipsometry
http://aip.metastore.ingenta.com/content/aip/journal/jap/102/6/10.1063/1.2778744
10.1063/1.2778744
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