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Donor and Acceptor Behavior in a Polyfluorene for Photovoltaics

Henry M. P. Wong ; Peng Wang ; Agnese Abrusci ; Mattias Svensson ; Mats R. Andersson (Institutionen för kemi- och bioteknik, Polymerteknologi) ; Neil C. Greenham
J. Phys. Chem. C FIELD Full Journal Title:Journal of Physical Chemistry C Vol. 111 (2007), 13, p. 5244-5249.
[Artikel, refereegranskad vetenskaplig]

The authors study photovoltaic devices based on a red-absorbing conjugated polymer poly(2,7-(9,9-dioctyl-fluorene)-alt-5,5-(4',7'-di-2-thienyl-2',1',3'-benzothiadiazole)) (APFO-3). The polymer acts as an electron donor when blended with ZnO nanoparticles, giving a short-circuit quantum efficiency of 28%. When blended with poly(3-hexylthiophene) (P3HT), however, the APFO-3 acts as an electron acceptor, giving a short-circuit quantum efficiency of 12%. The authors study this charge-transfer process by comparing photoinduced absorption spectra of the hybrid blends with the absorption spectra of chem. doped APFO-3, which allows one to distinguish features due to pos. and neg. polarons. The authors also present dark current measurements of single-carrier devices which demonstrate that APFO-3 has similar mobilities for electrons and holes, consistent with ambipolar behavior in photovoltaic devices. [on SciFinder (R)]



Denna post skapades 2008-01-15. Senast ändrad 2008-01-21.
CPL Pubid: 66837

 

Institutioner (Chalmers)

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

Ämnesområden

Polymerkemi

Chalmers infrastruktur