Conjugated polymers with polar side chains in bulk heterojunction solar cell devices
2014 (English)In: Polymer international, ISSN 0959-8103, E-ISSN 1097-0126, Vol. 63, no 1, 22-30 p.Article in journal (Refereed) Published
Two polymers with polar side chains, namely poly[2,7-(9,9-dioctylfluorene)-alt-5,5-(5,8-di-2-thienyl-(2,3-bis(3-(2-(2-methoxyethoxy)ethoxy)phenyl)quinoxaline))] (P1) and poly[2,7-(9,9-bis(2-(2-methoxyethoxy)ethyl)fluorene)-alt-5,5-(5,8-di-2-thienyl-(2,3-bis(3-(2-(2-methoxyethoxy)-ethoxy)phenyl)quinoxaline))] (P2), were synthesized for solar cell application. A series of bulk heterojunction solar cells were systematically fabricated and characterized by varying the electron-acceptor materials, processing solvents and thickness of the active layer. The results show that P1, with a higher molecular weight and good film-forming properties, performed better. The best device showed an open circuit voltage of 0.87 V, a short circuit current of 6.81 mA cm(-2) and a power conversion efficiency of 2.74% with 1:4 polymer:[6,6]-phenyl-C71-butyric acid methyl ester (PCBM) mixture using o-dichlorobenzene (o-DCB) as processing solvent. P2 on the other hand showed a poorer performance with chlorobenzene as processing solvent, but a much improved performance was obtained using o-DCB instead. Thus, an open circuit voltage of 0.80 V, short circuit current of 6.21 mA cm(-2) and an overall power conversion efficiency of 2.22% were recorded for a polymer:PCBM mixing ratio of 1:4. This is presumably due to the improvement of the morphology of the active layer using o-DCB as processing solvent.
Place, publisher, year, edition, pages
Wiley-Blackwell , 2014. Vol. 63, no 1, 22-30 p.
conjugated polymer, polar polymer, power conversion efficiency, donor-acceptor-donor
Engineering and Technology
IdentifiersURN: urn:nbn:se:liu:diva-102845DOI: 10.1002/pi.4600ISI: 000327997800004OAI: oai:DiVA.org:liu-102845DiVA: diva2:683845
Funding Agencies|International Science Programmes, Uppsala University, Sweden||2014-01-072014-01-022015-05-29