CROSS-DISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY |
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Improved Charge-Collection Efficiency in PCDTBT:PC71BM-Based Solar Cells via CS2 Solvent Vapor Annealing |
FANG Gang1, WU Jiang1, FU Ying-Ying1, MENG Bin1, XIE Zhi-Yuan1**, GUO Shi-Jie2** |
1State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022 2The First Bethune Hospital of Jilin University, Changchun 130021
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Cite this article: |
FANG Gang, WU Jiang, FU Ying-Ying et al 2013 Chin. Phys. Lett. 30 068801 |
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Abstract Photo-generated charge collection is strongly correlated with the alignment and connectivity of the individual domains of donor and acceptor in bulk heterojunction polymer solar cells. It is found that CS2 vapor annealing on PCDTBT:PC71BM (1:4) blend effectively improves the hole-transport pathways of PCDTBT domains, which reduces accumulation of photo-generated charges and improves charge collection efficiency. The PCDTBT:PC71BM-based solar cells with the active layer subjected to CS2 vapor annealing demonstrate a high fill factor of 0.71–0.73 and a power conversion efficiency of 6.68%, about a 10% increase in comparison with the control cell.
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Received: 22 March 2013
Published: 31 May 2013
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PACS: |
88.40.jr
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(Organic photovoltaics)
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88.40.hj
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(Efficiency and performance of solar cells)
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73.50.-h
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(Electronic transport phenomena in thin films)
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