A planar copolymer for high efficiency polymer solar cells.
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).
Institute of Chemistry CAS, Beijing 100190, China, Department of Physics, Chemistry and Biology, Linköping University, Sweden.
Ruiping
R
Qin
Weiwei
W
Li
Cuihong
C
Li
Chun
C
Du
Clemens
C
Veit
Hans-Frieder
HF
Schleiermacher
Mattias
M
Andersson
Zhishan
Z
Bo
Zhengping
Z
Liu
Olle
O
Inganäs
Uli
U
Wuerfel
Fengling
F
Zhang