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Recombination studies in a polyfluorene copolymer for photovoltaic applications

Harri Aarnio ; Markus Westerling ; Ronald Oesterbacka ; Mattias Svensson ; Mats R. Andersson (Institutionen för kemi- och bioteknik, Polymerteknologi) ; Torbjoern Pascher ; Jinxi Pan ; Villy Sundstroem ; Henrik Stubb
Synthetic Metals Vol. 155 (2005), 2, p. 299-302.
[Artikel, refereegranskad vetenskaplig]

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)]

Denna post skapades 2006-08-25.
CPL Pubid: 10084


Institutioner (Chalmers)

Institutionen för kemi- och bioteknik, Polymerteknologi (2005-2014)


Annan kemi

Chalmers infrastruktur