Journal
SOLAR ENERGY MATERIALS AND SOLAR CELLS
Volume 145, Issue -, Pages 412-417Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.solmat.2015.11.005
Keywords
Carbazole; Polymer solar cells; Absorption spectra; Torsion angle; Benzothiadiazole
Funding
- Young Scientists Foundation of Henan Normal University [01026400061]
- Henan Province Basic and Frontier Technology Research Projects [1323004100247]
- National Natural Science Foundation of China [21402042]
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A series of conjugated polymers with carbazole monomer/dimer/trimer as the donor unit or benzothiadiazole monomer/trimer as the acceptor unit were synthesized and used as donor materials for polymer solar cells (PSCs). The influence of polymer structure on the optical properties and performance of PSCs was investigated in detail. P1 showed a power conversion efficiency (PCE) of 5.8%. The incorporation of longer donor or acceptor unit leads to a blue shift of absorption spectrum and the polymers became more amorphous due to the large torsion angels in the polymer backbone. After increasing the length of donor or acceptor, the PCE decreased dramatically to 0.43% for P2, 0.23% for P3, and 1.23% for P4. Our results have offered a useful insight to structure-property relationship for high performance polymer solar cells. (C) 2015 Elsevier B.V. All rights reserved.
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