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• W2025804976 abstract "We demonstrate a long-sought reliable method for determining the important branching ratio $ensuremath{eta}$ between photogenerated charged polarons and neutral excitons in $ensuremath{pi}$-conjugated polymer films and solutions, using femtosecond transient photomodulation spectroscopy with broad spectral range from 0.14 to $2.7phantom{rule{0.3em}{0ex}}mathrm{eV}$. We found that both excitons and polarons are instantaneously photogenerated, but $ensuremath{eta}$ critically depends on the film nanomorphology, which ultimately controls the interchain coupling strength. We also found that a correlation exists within each polymer family between the obtained $ensuremath{eta}$ value, photoluminescence quantum efficiency, and the transient polarization memory lifetime; where the interchain coupling strength in the film determines them all. We show that $ensuremath{eta}$ varies from less than 1% in solutions and glassy films of poly(p-phenylene-vinylene) derivatives, where the polymer chains are relatively isolated; to more than 30% in ordered films that contain lamellae, such as regio-regular poly(3-hexyl-thiophene). Our results may serve for matching polymers to specific device applications, where polymers with large $ensuremath{eta}$ values are good candidates for photodetector and photovoltaic applications, whereas those with small $ensuremath{eta}$ values are more suitable for active layers in organic light emitting devices." @default.
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• W2025804976 date "2007-02-12" @default.
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• W2025804976 title "Experimental determination of the charge/neutral branching ratio<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:mi>η</mml:mi></mml:mrow></mml:math>in the photoexcitation of<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:mi>π</mml:mi></mml:mrow></mml:math>-conjugated polymers by broadband ultrafast spectroscopy" @default.
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• W2025804976 doi "https://doi.org/10.1103/physrevb.75.085206" @default.
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