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Realizing 11.3% efficiency in fullerene-free polymer solar cells by device optimization

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Abstract

In this work, photovoltaic properties of the PBDB-T:ITIC based-NF-PSCs were fully optimized and characterized by tuning the morphology of the active layers and changing the device architecture. First, donor/acceptor (D/A) weight ratios were scanned, and then further optimization was performed by using different additives, i.e. 1,8-diiodooctane (DIO), diphenyl ether (DPE), 1-chloronaphthalene (CN) and N-methyl-2-pyrrolidone (NMP), on the basis of best D/A ratio (1:1, w/w), respectively. Finally, the conventional or inverted device architectures with different buffer layers were employed to fabricate NF-PSC devices, and meanwhile, the morphology of the active layers was further optimized by controlling annealing temperature and time. As a result, a record efficiency of 11.3% was achieved, which is the highest result for NF-PSCs. It’s also remarkable that the inverted NF-PSCs exhibited long-term stability, i.e. the best-performing devices maintain 83% of their initial PCEs after over 4000 h storage.

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Authors and Affiliations

  1. State Key Laboratory of Polymer Physics and Chemistry; Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China

    Wenchao Zhao, Shaoqing Zhang & Jianhui Hou

  2. University of Chinese Academy of Sciences, Beijing, 100049, China

    Wenchao Zhao & Jianhui Hou

Authors
  1. Wenchao Zhao
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  2. Shaoqing Zhang
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  3. Jianhui Hou
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Correspondence to Jianhui Hou.

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Zhao, W., Zhang, S. & Hou, J. Realizing 11.3% efficiency in fullerene-free polymer solar cells by device optimization. Sci. China Chem. 59, 1574–1582 (2016). https://doi.org/10.1007/s11426-016-0198-0

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  • DOI: https://doi.org/10.1007/s11426-016-0198-0

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