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Photoinduced absorption in an alternating polyfluorene copolymer for photovoltaic applications

H. Aarnio ; M. Westerling ; R. Oesterbacka ; M. Svensson ; Mats R. Andersson (Institutionen för kemi- och bioteknik, Polymerteknologi) ; H. Stubb
Chemical Physics Vol. 321 (2006), 1-2, p. 127-132.
[Artikel, refereegranskad vetenskaplig]

The authors present a detailed study 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)], and its blends with the fullerene deriv. [6,6]-phenyl-C61-butyric acid Me ester, using continuous wave photoinduced absorption (PA) techniques. The authors also present the use of phase information from the PA measurements for estg. the no. of different photoexcitation types present in the PA spectra as well as their lifetimes. In all blends the PA spectra show a broad high-energy PA band ranging from .apprx.1 to 2 eV as well as a low-energy band at .apprx.0.35 eV. The authors find two kinds of excitations present at 80 DegK, polarons showing dispersive recombination with lifetimes of roughly a millisecond, and a 2nd kind of photoexcitation tentatively assigned to coulombically bound intrachain polaron pairs showing practically nondispersive recombination with a lifetime of .apprx.20 ms. [on SciFinder (R)]

Denna post skapades 2007-01-12. Senast ändrad 2007-04-11.
CPL Pubid: 25369


Institutioner (Chalmers)

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



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