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- Title
Novel Copolymers Based Tetrafluorobenzene and Difluorobenzothiadiazole for Organic Solar Cells with Prominent Open Circuit Voltage and Stability.
- Authors
Liao, Xunfan; Wu, Feiyan; An, Yongkang; Xie, Qian; Chen, Lie; Chen, Yiwang
- Abstract
Two novel copolymers based on benzothiadiazole (BT) or difluorobenzothiadizole (ffBT) with 2,2′-(perfluoro-1,4-phenylene)dithiophene (2TPF4), namely PBT-2TPF4 and PffBT-2TPF4, are synthesized for applications in polymer solar cells (PSCs). A noticeably high open-circuit voltage ( Voc) of 1.017 and 0.87 V are achieved for PffBT-2TPF4 and PBT-2TPF4-based devices, respectively. Although only a moderate efficiency (5.7%) of PBT-2TPF4-based devices is obtained, it is first demonstrated that 2TPF4 is a promising acceptor block for construction of the donor copolymers which possess high Voc, prominent crystallinity, and long-term stability, simultaneously. Besides, two thienyl flanking the tetrafluorophenylene can decrease torsion angle between conjugated units, resulting in a high coplanar structure of copolymers to enhance their charge carrier mobility. The findings may open a promising and practical way to accelerate the commercialization of PSCs by developing a series of new donor copolymers for efficient and long-term stable thickness bulk heterojunction PSCs.
- Subjects
SOLAR cells; COPOLYMERS; CRYSTALLINITY; HETEROJUNCTIONS; OPEN-circuit voltage
- Publication
Macromolecular Rapid Communications, 2017, Vol 38, Issue 3, pn/a
- ISSN
1022-1336
- Publication type
Article
- DOI
10.1002/marc.201600556