| Autor: |
Cadby, A., Khalil, G., Fox, A. M., Lidzey, D. G. |
| Předmět: |
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| Zdroj: |
Journal of Applied Physics; May2008, Vol. 103 Issue 9, p093715, 5p, 2 Diagrams, 2 Graphs |
| Abstrakt: |
We have used time-resolved scanning near-field microscopy to image the fluorescence decay lifetime across a phase-separated blend of the photovoltaic-applicable polymers poly(9,9′-dioctylfluorene-alt-benzothiadiazole) (F8BT) and poly(9,9′-dioctylfluorene-alt-bis- N,N′-(4-butylphenyl)-bis-N,N′-phenyl-1,4-phenylenediamine) (PFB). We show that the efficiency of local fluorescence quenching is composition dependent, with excitons on F8BT molecules being more effectively quenched when F8BT is trapped at a low concentration in a PFB-rich phase. Despite such presumed differences in charge-carrier generation efficiency, our results demonstrate that charge extraction from F8BT:PFB devices is the most dominant mechanism limiting their operational efficiency. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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