Journal
ORGANIC ELECTRONICS
Volume 15, Issue 11, Pages 2876-2884Publisher
ELSEVIER
DOI: 10.1016/j.orgel.2014.08.022
Keywords
Polymer solar cells; Two-dimensional copolymers; Conjugated spacers; Photovoltaic properties
Funding
- Major Program for Cultivation of the National Natural Science Foundation of China [91233112]
- National Natural Science Foundation of China [21172187, 51273168, 21202139]
- Research Foundation of Education Bureau of Hunan Province [13A102, 11CY023]
- Innovation Group and Xiangtan Joint Project in Hunan Natural Science Foundation [12JJ7002, 12JJ8001]
- Open Project for National Key Laboratory of Luminescent Materials and Devices [2014-skIlmd-10]
- Hunan Postgraduate Science Foundation for Innovation [CX2013 B268]
- Swedish Research Council
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A class of low band-gap two-dimensional conjugated polymers of PBDTT-FQ PBDTT-TQ PBDTT-BTQ and PBDTT-TTQ was designed and synthesized, which contains the same di(alkylthiophene)-substituted benzo[1,2-b:4,5-b']dithiophene (BDTT) and 6,7-difluoro-quinoxaline (Q) units, as well as various conjugated spacers of furan, thiophene, bithiophene and thieno[3,2-b]thiophene in the main chain. Significant effect of the varied spacers between the BDTT and Q units on the thermal, optical, electrochemical and photovoltaic properties was investigated and observed for these two-dimensional copolymers in the polymer solar cells. The maximum power conversion efficiency of 5.9% with a short circuit current of 13.7 mA/cm(2) and a fill factor of 0.56 was obtained for the PBDTT-TQ with thiophene spacer in the bulk hetero-junction PSCs using [6,6]-phenyl-C-71-butyric acid methyl ester as acceptor. (C) 2014 Elsevier B.V. All rights reserved.
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