A Planar Copolymer for High Efficiency Polymer Solar Cells
Ruiping Qin(Linköping University), Weiwei Li(Linköping University), Cuihong Li(Linköping University), Chun Du(Linköping University), Clemens Veit(Linköping University), Hans‐Frieder Schleiermacher(Linköping University), L. Mattias Andersson(Linköping University), Zhishan Bo(Linköping University), Zhengping Liu(Linköping University), Olle Inganäs(Linköping University), Uli Wuerfel(Linköping University), Fengling Zhang(Linköping University)
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Abstract
An alternating copolymer, poly(2-(5-(5,6-bis(octyloxy)-4-(thiophen-2-yl)benzo[c][1,2,5]thiadiazol-7-yl)thiophen-2-yl)-9-octyl-9H-carbazole) (HXS-1), was designed, synthesized, and used as the donor material for high efficiency polymer solar cells. The close packing of the polymer chains in the solid state was confirmed by XRD. A J(sc) of 9.6 mA/cm(2), a V(oc) of 0.81 V, an FF of 0.69, and a PCE of 5.4% were achieved with HXS-1 and [6,6]-phenyl C(71)-butyric acid methyl ester (PC(71)BM) as a bulk heterojunction active layer spin-coated from a solvent mixture of 1,2-dichlorobenzene and 1,8-diodooctane (97.5:2.5) under air mass 1.5 global (AM 1.5 G) irradiation of 100 mW/cm(2).
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