Influence of Molecular Weight on the Performance of Organic Solar Cells Based on a Fluorene Derivative
2010 (English)In: ADVANCED FUNCTIONAL MATERIALS, ISSN 1616-301X, Vol. 20, no 13, 2124-2131 p.Article in journal (Refereed) Published
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.
Place, publisher, year, edition, pages
John Wiley and Sons, Ltd , 2010. Vol. 20, no 13, 2124-2131 p.
National CategoryEngineering and Technology
IdentifiersURN: urn:nbn:se:liu:diva-58539DOI: 10.1002/adfm.201000224ISI: 000280276900013OAI: oai:DiVA.org:liu-58539DiVA: diva2:343390