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• W2097292371 endingPage "7735" @default.
• W2097292371 startingPage "7721" @default.
• W2097292371 abstract "The electro-optical properties of thin films of electron donor-acceptor blends of a fluorene copolymer (PF10TBT) and a fullerene derivative (PCBM) were studied. Transmission electron microscopy shows that in these films nanocrystalline PCBM clusters are formed at high PCBM content. For all concentrations, a charge transfer (CT) transition is observed with absorption spectroscopy, photoluminescence, and electroluminescence. The CT emission is used as a probe to investigate the dissociation of CT excited states at the donor-acceptor interface in photovoltaic devices, as a function of an applied external electric field and PCBM concentration. We find that the maximum of the CT emission shifts to lower energy and decreases in intensity with higher PCBM content. We explain the red shift of the emission and the lowering of the open-circuit voltage (V(OC)) of photovoltaic devices prepared from these blends with the higher relative permittivity of PCBM (epsilon(r) = 4.0) compared to that of the polymer (epsilon(r) = 3.4), stabilizing the energy (E(CT)) of CT states and of the free charge carriers in blends with higher PCBM concentration. We show that the CT state has a short decay time (tau = ca. 4 ns) that is reduced by the application of an external electric field or with increasing PCBM content. The field-induced quenching can be explained quantitatively with the Onsager-Braun model for the dissociation of the CT states when including a high electron mobility in nanocrystalline PCBM clusters. Furthermore, photoinduced absorption spectroscopy shows that increasing the PCBM concentration reduces the yield of neutral triplet excitons forming via electron-hole recombination, and increases the lifetime of radical cations. The presence of nanocrystalline domains with high local carrier mobility of at least one of the two components in an organic heterojunction may explain efficient dissociation of CT states into free charge carriers." @default.
• W2097292371 created "2016-06-24" @default.
• W2097292371 creator A5017119143 @default.
• W2097292371 creator A5026269572 @default.
• W2097292371 creator A5027460813 @default.
• W2097292371 creator A5028259338 @default.
• W2097292371 creator A5032443297 @default.
• W2097292371 creator A5038975929 @default.
• W2097292371 creator A5050178167 @default.
• W2097292371 creator A5050670274 @default.
• W2097292371 creator A5051431037 @default.
• W2097292371 creator A5073629238 @default.
• W2097292371 date "2008-05-22" @default.
• W2097292371 modified "2023-10-10" @default.
• W2097292371 title "Compositional and Electric Field Dependence of the Dissociation of Charge Transfer Excitons in Alternating Polyfluorene Copolymer/Fullerene Blends" @default.
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