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Influence of Molecular Weight on the Performance of Organic Solar Cells Based on a Fluorene Derivative

C. Muller ; Ergang Wang (Institutionen för kemi- och bioteknik, Polymerteknologi) ; L. M. Andersson ; K. Tvingstedt ; Y. Zhou ; Mats R. Andersson (Institutionen för kemi- och bioteknik, Polymerteknologi) ; O. Inganas
Advanced Functional Materials (1616-301X). Vol. 20 (2010), 13, p. 2124-2131.
[Artikel, refereegranskad vetenskaplig]

The performance of organic photovoltaic (OPV) bulk-heterojunction blends comprising a liquid-crystalline fluorene derivative and a small-molecular fullerene is found to increase asymptotically with the degree of polymerization of the former. Similar to various thermodynamic transition temperatures as well as the light absorbance of the fluorene moiety, the photocurrent extracted from OPV devices is found to strongly vary with increasing oligomer size up to a number average molecular weight, M-n approximate to 10 kg mol(-1), but is rendered less chain-length dependent for higher M-n as the fluorene derivative gradually adopts polymeric behavior.

Nyckelord: polyfluorene copolymer/fullerene blends, liquid-crystalline, polyfluorene, field-effect transistors, open-circuit voltage, charge-transport, thermotropic alignment, thin-films, polymer, dependence, morphology

Denna post skapades 2010-08-30. Senast ändrad 2014-09-02.
CPL Pubid: 125372


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Institutioner (Chalmers)

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



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