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• W2548211026 abstract "We report thickness-dependent glass transition temperature (${T}_{g}$) and charge mobility in cross-linked thin films made of conjugated polymer poly(9,9-dioctylfluorene-co-$N$-(4-butylphenyl)diphenylamine) (TFB). Monotonic ${T}_{g}$ depressions with reducing film thickness in thermally and UV cross-linked TFB thin films supported on Si-SiOx substrates are observed through ellipsometry measurements, suggesting that a surface mobile layer with enhanced chain dynamics still exists in cross-linked TFB thin films, even with a high cross-linking percentage. Data fitting using a three-layer model shows that the ${T}_{g}$ in the interface, bulk and surface layer both increases with increasing cross-linking, while the thickness of the interface and surface layer increases and reduces, respectively. Cross-linking of TFB thin film generates traps that hinder charge transport and consequently reduce charge mobility. The charge mobility converges in thick (>140 nm) and thin (40 nm) TFB films but shows strong thickness dependence in between, reducing from $4.0ifmmodetimeselsetexttimesfi{}{10}^{ensuremath{-}4}phantom{rule{0.16em}{0ex}}mathrm{c}{mathrm{m}}^{2}/mathrm{V}phantom{rule{0.16em}{0ex}}mathrm{s}$ in a 180-nm film to $0.1ifmmodetimeselsetexttimesfi{}{10}^{ensuremath{-}4}phantom{rule{0.16em}{0ex}}mathrm{c}{mathrm{m}}^{2}/mathrm{V}phantom{rule{0.16em}{0ex}}mathrm{s}$ in a 20-nm thin film." @default.
• W2548211026 created "2016-11-11" @default.
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• W2548211026 date "2016-11-04" @default.
• W2548211026 modified "2023-10-18" @default.
• W2548211026 title "Thickness-dependent glass transition temperature and charge mobility in cross-linked polyfluorene thin films" @default.
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• W2548211026 doi "https://doi.org/10.1103/physreve.94.052503" @default.
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