Recombination studies in a polyfluorene copolymer for photovoltaic applications
| Autor: | M Svensson, Mats Andersson, Jinxi Pan, Harri Aarnio, Villy Sundström, M. Westerling, Torbjörn Pascher, Henrik Stubb, Ronald Österbacka |
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| Rok vydání: | 2005 |
| Předmět: |
Photoluminescence
Materials science Mechanical Engineering Metals and Alloys Condensed Matter Physics Polaron Photochemistry Molecular physics Electronic Optical and Magnetic Materials Polyfluorene chemistry.chemical_compound Microsecond chemistry Mechanics of Materials Frequency domain Materials Chemistry Continuous wave Time domain Absorption (electromagnetic radiation) |
| Zdroj: | Synthetic Metals. 155:299-302 |
| ISSN: | 0379-6779 |
| DOI: | 10.1016/j.synthmet.2005.01.033 |
| Popis: | We present detailed continuous wave (cw) and transient photoinduced absorption (PA) measurements in thin films of a novel alternating polyfluorene copolymer, poly[2,7-(9,9-dioctyl-fluorene)-alt-5,5-(4',7'-di-2-thienyl-2',1',3-benzo-thiadiazole)] (DiO-PFDTBT), and its blends with the sol. fullerene deriv. [6,6]-phenyl-C61-butyric acid Me ester (PCBM) in wt. ratios of 1:0, 4:1 and 1:4. We measure the frequency, intensity and temp. dependence of the PA signal in the frequency domain, and compare with the results obtained from the transient PA decay measurements in the time domain. In all blends, the PA spectrum shows a broad high energy PA band ranging from .apprx.1 eV to 2 eV as well as a low energy band peaking at .apprx.0.35 eV. We attribute the low energy band to the P1 transition of polarons and part of the high energy band to the correlated P2 transition of polarons. Both frequency and time domain measurements show that the high energy band has two decay components, a faster component in the microsecond time regime and a slower component in the millisecond time regime. The slow component is strongly dispersive, whereas the fast component is practically non-dispersive. [on SciFinder (R)] |
| Databáze: | OpenAIRE |
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