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Charge separation and fullerene triplet formation in blend films of polyfluorene polymers with [6,6]-phenyl C61 butyric acid methyl ester
Ist Teil von
Dalton transactions : an international journal of inorganic chemistry, 2009-01 (45), p.10000-10005
Ort / Verlag
England
Erscheinungsjahr
2009
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
Transient and steady state optical spectroscopies were used to study thin films made from a series of polyfluorene polymers blended with [6,6]-phenyl C61 butyric acid methyl ester (PCBM) in order to determine the influence of polymer ionisation potential on photoinduced charge separation. We find that the energy of the charge separated state DeltaE(CS), given by the energy difference between the ionisation potential of the polymer and the electron affinity of the fullerene, must be smaller than a threshold value of about 1.6 eV for charge separation to occur. When DeltaE(CS) is greater than this threshold, PCBM triplet formation is observed in preference to charge pair generation. If DeltaE(CS) is similar to the threshold value, both PCBM triplet formation and charge separation occur in the blend film, with a tendency for charge separation to dominate over PCBM triplet formation as PCBM concentration increases. The mechanism of triplet formation is believed to be energy transfer to the PCBM singlet state followed by intersystem crossing. The threshold value of DeltaE(CS) is found to be similar to the PCBM singlet energy.
Sprache
Englisch
Identifikatoren
ISSN: 1477-9226
eISSN: 1477-9234
DOI: 10.1039/b910675h
Titel-ID: cdi_proquest_miscellaneous_734134076
Format
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