Journal
ORGANIC ELECTRONICS
Volume 17, Issue -, Pages 129-137Publisher
ELSEVIER
DOI: 10.1016/j.orgel.2014.11.021
Keywords
Conjugated polymer; Benzo[1,2-b:4,5-b ']dithiophene; Quinoxaline; Polymer solar cells
Funding
- National Natural Science Foundation of China [91233112, 21172187, 51273168]
- Innovation Group and Xiangtan Joint Project of Hunan Natural Science Foundation [12JJ7002, 12JJ8001]
- Open Project of State Key Laboratory of Luminescent Materials and Devices [2014-skllmd-10]
- Scientific Research Fund of Hunan Provincial Education Department [11CY023, 12B123]
- Scientific Research Fund of Xiangtan University [11QDZ18, 2011XZX08]
- Postgraduate Science Foundation for Innovation in Hunan Province [CX2014B257, CX2013B268]
Ask authors/readers for more resources
Two novel 5,8-disubstituted benzo[1,2-b:4,5-b']dithiophene-alt-2,3-di(4-methoxylphenyl)- 6,7-dioctyloxy-5,8-dithienyl-quinoxaline copolymers of PBDTDT-(Qx-2)-O and PBDTDT(Qx-2)-T were designed and synthesized, in which the substituents are branch dioctyloxy and di(octylthienyl), respectively. Their optical, thermal, electro-chemical and photovoltaic properties were investigated. Compared to the reported analogues, both one-and two-dimensional (1D and 2D) copolymers exhibited outstandingly increasing open-circuit voltages (V-oc) about 0.91-0.95 V in their bulk hetero-junction polymer solar cells (PSCs) with [6,6]-phenyl-C-71-butyric acid methyl ester (PC71BM) acceptor. The maximum power conversion efficiency (PCE) of 6.31% with V-oc of 0.95 V, short-circuit current of 10.82 mA cm(-2) and fill factor of 61.4% was obtained in the 2D-conjugated polymer of PBDTDT(Qx-2)-T/PC71BM-based device. The PCE value is 1.42 times higher than that of the 1D-conjugated polymer of PBDTD(Qx-2)-O/PC71BM-based device. Our work demonstrates that Voc values of the quinoxaline-type copolymers based PSCs can remarkably be increased by appending dioctyloxy chains at 6,7-positions of quinoxaline. (C) 2014 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available